Description of a new species of Malayopo
DESCRIPTION OF A NEW SPECIES OF MALAYOPOTAMON BOTT, 1968
(DECAPODA, BRACHYURA, POTAMIDAE) FROM GUNUNG SLAMET,
CENTRAL JAVA, INDONESIA
BY
DAISY WOWOR1,3 ) and SWEE HEE TAN2,4 )
1 ) Division of Zoology, Research Center for Biology, Indonesian Institute of Sciences (LIPI),
Jalan Raya Jakarta Bogor km 46, Cibinong 16911, Indonesia
2 ) Raffles Museum of Biodiversity Research (RMBR), National University of Singapore,
Department of Biological Sciences, 6 Science Drive 2, #03-01, Singapore 117546,
Republic of Singapore
ABSTRACT
A new species of terrestrial potamid crab, Malayopotamon lipkei sp. nov., is described
from Gunung Slamet, Central Java, Indonesia. This new species is similar to M. granulatum
(De Man, 1892), but can be differentiated by several characters, viz. the carapace with longer
anterolateral serrated crest margins, the relatively larger and the denser granules on branchial
and gastric regions, more prominent epigastric lobes, males with proportionately broadly
abdominal somites III-V, more granulated chelipeds, and distal segment of G1 bent inwards
at about 30◦ .
RÉSUMÉ
Une nouvelle espèce de crabe terrestre Potamidae, Malayopotamon lipkei sp. nov., est
décrite de Gunung Slamet, Java centrale, Indonésie. Cette nouvelle espèce est similaire
à M. granulatum (De Man, 1892), mais peut s’en distinguer par plusieurs caractères tels
que: la carapace avec des bords en crêtes serrulés plus longues antérieurement, les régions
branchiales et gastriques relativement plus grandes et avec une plus forte densité de granules,
les lobes épigastriques plus proéminents, chez les mâles les somites abdominales III-V
proportionellement élargis, des pinces plus granuleuses et la partie distale du G1courbée vers
l’intérieur d’environ 30◦ .
3 ) Corresponding author; e-mail: [email protected]
4 ) e-mail: [email protected]
© Koninklijke Brill NV, Leiden, 2010
Studies on Malacostraca: 727-734
728
CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME
INTRODUCTION
Of the 10 known species of Malayopotamon Bott, 1968 (Ng et al., 2008),
only two have been reported from Java, i.e. M. granulatum (De Man, 1892)
and M. javanense (Bott, 1968). Both species are only known from West Java
Province thus far (De Man, 1892; Bott, 1968, 1970; Ng & Tan, 1999). They
are usually montane or submontane species and are sometimes found together
especially in Cibodas Botanical Garden, Cianjur Regency at 1400 m asl. The
most eastern known distribution for M. granulatum is Kuningan Regency
in West Java at the border with Central Java (see material examined). In
this paper, a new species of Malayopotamon is described from Central Java
Province.
The material examined is deposited in Museum Zoologicum Bogoriense
(MZB), Research Center for Biology, Indonesian Institute of Sciences, Cibinong, Indonesia; and Zoological Reference Collection (ZRC), Raffles Museum
of Biodiversity Research, National University of Singapore. The Indonesian
terms “Sungai” abbreviated as Sg., refers to river, stream or tributary, “Gunung” is abbreviated as Gn. referring to mountain, “Kampung” is abbreviated
as Kp. referring to village. The terminology used here follows Ng (1988) and
Ng et al. (2008). The abbreviations G1 and G2 refer to the first and second
male gonopods, respectively.
TAXONOMIC ACCOUNT
Family P OTAMIDAE Ortmann, 1896
Genus Malayopotamon Bott, 1968
Malayopotamon lipkei sp. nov.
(figs. 1A-C, 2A, 3A)
Material examined. — Holotype: male (43.6 × 37.7 mm) (MZB Cru 2902), Banyumas
Regency, Batur Raden District, Gn. Slamet, Sg. Kracakan, Kp. Ketengger, 07◦ 18.837′ S
109◦ 12.313′ E, coll. Heryanto & U. Nurhaman, 20 May 2009. Paratypes: 1 male (27.2 ×
23.5 mm) (ZRC), Banyumas Regency, Batur Raden District, Gn. Slamet, Sg. Serengseng, Kp.
Ketengger, coll. Heryanto & U. Nurhaman, 24 May 2009; 1 female (29.6 × 26.0 mm) (MZB
Cru 2903), Banyumas Regency, Batur Raden District, Gn. Slamet, Sg. Kalipagu, Kp. Ketengger,
coll. Heryanto & U. Nurhaman, 19 May 2009; 2 females (33.2 × 28.9-23.1 × 20.4 mm),
1 juvenile (16.8 × 14.4 mm) (MZB Cru 2904), Banyumas Regency, Batur Raden District,
Gn. Slamet, Sg. Akar, around pine forest, Kp. Ketengger, 07◦ 18.682′ S 109◦ 12.880′ E, coll.
Heryanto & U. Nurhaman, 22 May 2009. Others: 7 females (60.9 × 50.6-50.3 × 42.9 mm)
(ZRC), from aquarium trade in Singapore, supposedly collected from Cilacap, 5 May 2009. All
localities in Central Java Province, Indonesia.
Wowor & Tan, NEW MALAYOPOTAMON FROM CENTRAL JAVA
729
Fig. 1. A-C, Malayopotamon lipkei sp. nov., holotype, male (43.6×37.7 mm) (MZB Cru 2902);
D-F, Malayopotamon granulatum (De Man, 1892), male (45.4 × 37.6 mm) (MZB Cru 2905).
A, D, ventral view of left G1; B, E, dorsal view of left G1; C, F, left G2. Scales = 2 mm.
730
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Fig. 2. Overall views. A, Malayopotamon lipkei sp. nov., holotype, male (43.6 × 37.7 mm)
(MZB Cru 2902); B, Malayopotamon granulatum (De Man, 1892), male (40.3 × 35.2 mm)
(ZRC 2008.0438).
Comparative material. — Malayopotamon granulatum (De Man, 1892): 1 male (45.4 ×
37.6 mm), 1 female (15.1 × 34.1 mm) (MZB Cru 2905), Indonesia, West Java Province, Cianjur
Regency, Cipanas District, Sg. Ciismun, Cibodas Botanical Garden, coll. D.C. Murniati &
N. Mujiono, 8 June 2006; 1 male (56.1 × 47.5 mm) (MZB Cru 2906), Indonesia, West Java
Province, Kuningan Regency, Sg. Cibuluh, tributary of Sg. Cicangkrung, coll. I. Rachmatika,
8 April 2006; 2 males (47.3 × 39.8-42.4 × 35.8 mm) (MZB Cru 2907), Indonesia, West Java
Province, Cianjur Regency, Cipanas District, Cibodas, alt. 1400 m asl, coll. T. van Benthem
Jutting, December 1930; 1 male (50.1 × 38.9 mm) (ZRC 1984.7058), Indonesia, West Java
Province, Cianjur Regency, Cipanas District, Cibodas, January 1935; 1 male (40.3 × 35.2 mm)
(ZRC 2008.0438), Indonesia, West Java Province, Cianjur Regency, Cipanas District, Cibodas,
coll. P.K.L. Ng, 13 June 1990; 1 ovigerous female (37.7 × 31.9 mm), 7 juveniles (ZRC
2000.1076), Indonesia, West Java Province, Sukabumi Regency, Sg. Cimaracun, tributary to
Lake Situ Gunung, coll. H.H. Tan, 3 October 1999; 10 males (19.2 × 16.6-39.6 × 32.6 mm)
(ZRC 2000.1233), Indonesia, West Java Province, Sukabumi Regency, Cisaat, coll. H.H. Tan &
D. Wowor, 2-3 October 1999.
Wowor & Tan, NEW MALAYOPOTAMON FROM CENTRAL JAVA
731
Fig. 3. Ventral views of thoracic sternites. A, Malayopotamon lipkei sp. nov., female (60.9 ×
50.6 mm) (ZRC), aquarium trade, supposedly from Cilacap; B, Malayopotamon granulatum
(De Man, 1892), ovigerous female (37.7 × 31.9 mm) (ZRC 2000.1076).
Diagnosis. — Carapace subquadrate, smooth, branchial and gastric regions
densely granulated, ovate and rounded granules large; anterolateral margins
732
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convex, crested; posterolateral margins converging towards posterior carapace
margin; anterolateral regions with no striae; posterolateral regions with few
long but low but distinct striae; posterior carapace margin straight; anterolateral regions lightly striated, epibranchial tooth distinct, low, separated from
external orbital tooth by shallow cleft; outer margin of external orbital tooth
straight, slightly serrated; epigastric lobes distinct, granulated, not continuous
with postorbital cristae; postorbital cristae prominent, sharp, continuous with
base of epibranchial tooth. G1 terminal segment subquadrilateral, bent inward
about 30◦ with jagged anterior margin.
Description. — Carapace subquadrate, anterior half wider than posterior
half; width 1.23-1.26 times length (mean = 1.25, n = 5); branchial, gastric and intestinal regions relatively swollen; branchial and gastric regions
densely granulated, ovate and rounded granules large; other parts of dorsal
surface smooth, glabrous. Gastric regions relatively swollen, not raised above
orbital region. Epigastric lobes distinct, granulated, no distinct crista, not continuous with postorbital cristae; postorbital cristae prominent, continuous with
base of epibranchial tooth; cervical and H-shaped gastric grooves distinct. Orbital region narrow. Frontal margin sinuous, smooth, with medial notch, more
prominent in larger specimens; supraorbital and infraorbital margins crested,
crista relatively smooth. Suborbital and pterygostomial regions swollen, granulated, granules low, glabrous. External orbital angle tooth small, low, triangular; anterolateral margin convex laterally, low crista present, smooth, serrated
crest margin reach widest part of carapace; epibranchial tooth low but present.
Epistome concave laterally, with median triangular lobe. Cornea of eye about
same length as eyestalk, slight constriction present at junction of cornea and
eyestalk. Third maxilliped rectangular; ischium with shallow median groove,
length about 4 times merus width; lateral margin of merus slightly projected
medially; exopod reaching to about one-third length of merus, with well developed flagellum, about half width of merus.
Cheliped asymmetrical, outer surfaces with smooth low tubercles; carpus
with sharp spine on inner margin, a low basal tubercle usually present below
spine; merus with 2 rows of ventral cristae, outer margin more strongly
tuberculated than inner. Fingers slightly longer than palm in larger male
specimens.
Ambulatory legs (second to fifth pereopods) relatively long, second ambulatory legs longest; legs generally glabrous; meri long, without distal tooth on
anterior margins; propodi with few short setae; dactyli of legs with rows of
short stiff setae on dorsal and ventral margins.
Wowor & Tan, NEW MALAYOPOTAMON FROM CENTRAL JAVA
733
Thoracic sternites II-IV smooth, with a few short setae. Thoracic sternites
II-III and III-IV demarcated by shallow grooves. Penis coxal. Female gonopore
crescent-shaped. Male abdomen with 6 free somites and telson, broadly
triangular; telson triangular, lateral margins with slight medial notch.
G1 stout, distal part of terminal segment subquadrilateral, bent inwards
about 30◦ with jagged anterior margin. G2 relatively long, well developed
distal segment, about two-thirds length of basal segment.
Life colour. — Carapace and ambulatory legs are reddish–purplish brown,
with the chelipeds reddish light brown.
Ecological notes. — The specimens were collected from middle part of
Gunung Slamet from 670 to 780 m asl. They were found under large rocks
on sandy substrate, in the middle of streams with clear fast running water. The
streams pass through rice fields with no canopy cover.
Etymology. — This new specific name is dedicated to the late Prof. Lipke
B. Holthuis, a carcinologist of great skill, knowledge and experience. He has
contributed so much to the knowledge of both authors, for which we are very
grateful. In addition, Prof. Holthuis was born in Probolinggo in Java, which
makes this tribute extra special.
Discussion. — The new species is morphologically most similar to M.
granulatum (De Man, 1892). However, the new species can be distinguished
by several characters. The carapace of M. lipkei sp. nov. is relatively more
granulated, especially on the gastric and branchial regions, with the granules
proportionately larger and denser, and a mix of ovate and rounded granules
(versus with smaller and widely spaced granules of a more rounded and pearllike appearance in M. granulatum). The anterolateral serrated crest margins
is also proportionately longer, reaching up to the widest part of the carapace
(versus shorter, reaching only about half the length of the anterolateral margins
in M. granulatum); the posterolateral regions have relatively fewer long and
short striae (versus low short striae in M. granulatum); the epigastric lobes
are more prominent; the demarcation lines between thoracic sternites IV
and V reach about one-third the proximal lateral margins of telson (versus
reaching a quarter of the proximal lateral margins in M. granulatum); the
abdominal somites III-V are strongly trapezoidal in shape (versus less so in
M. granulatum); and proportionately shorter abdominal somite V which is
about half as long as abdominal somite VI (versus distinctly more than half
in M. granulatum); the chela with proportionately larger and densely arrange
granules; the distal segment of G1 is bent inwards for about 30◦ (versus straight
in M. granulatum); and the distal segment of the G2 is about two-thirds as
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long as the basal segment (versus about half length of basal segment in M.
granulatum).
Although both Malayopotamon lipkei and M. granulatum are montane
species; M. lipkei is known from relatively lower altitudes between 670 to
780 m asl; while M. granulatum has been found thus far only at around 1400 m
asl.
ACKNOWLEDGEMENTS
The authors are grateful to Heryanto and Ujang Nurhaman of the Research
Center for Biology, Indonesian Institute of Sciences who collected the specimens of this interesting new species during their field work at Gunung Slamet,
Central Java for our study. We also thank Peter Ng of the National University
of Singapore whose valuable comments improve greatly this paper. The field
work was funded by the government of Indonesia through the Research Center
for Biology, Indonesian Institute of Sciences to both collectors. The first author
was supported by a Raffles Museum Fellowship from the National University
of Singapore.
REFERENCES
B OTT, R., 1968. Potamiden aus Süd-Asien (Crustacea, Decapoda). Senckenbergiana Biologica,
49: 119-130.
— —, 1970. Die Süsswasserkrabben von Europa, Asien, Australien und ihre Stammesgeschichte. Eine Revision der Potamoidea und Parathelphusoidea (Crustacea, Decapoda).
Abhandlungen der Senckenbergischen Naturforschenden Gesellschaft, 526: 1-338, figs. 18, pls. 1-58.
M AN , J.G. D E , 1892. Decapoden des Indischen Archipels. In: M. W EBER, Zoologische
Ergebnisse einer Reise in Niederlandisch Ost-Indien, 2: 265-527, pls. 15-29.
N G , P.K.L., 1988. The freshwater crabs of Peninsular Malaysia and Singapore: i-viii, 1-156,
figs. 1-63, colour pls. 1-4. (Department of Zoology, National University of Singapore).
N G , P.K.L., D. G UINOT & P.J.F. DAVIE , 2008. Systema Brachyurorum: Part I. An annotated
checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology, (supplement) 17: 1-286.
N G , P.K.L. & S.H. TAN , 1999. Revision of the Southeast Asian potamid crabs of the
genus Malayopotamon Bott, 1968 (Crustacea: Decapoda: Brachyura). Journal of Natural
History, 33: 207-231.
First received 28 November 2009.
Final version accepted 1 March 2010.
(DECAPODA, BRACHYURA, POTAMIDAE) FROM GUNUNG SLAMET,
CENTRAL JAVA, INDONESIA
BY
DAISY WOWOR1,3 ) and SWEE HEE TAN2,4 )
1 ) Division of Zoology, Research Center for Biology, Indonesian Institute of Sciences (LIPI),
Jalan Raya Jakarta Bogor km 46, Cibinong 16911, Indonesia
2 ) Raffles Museum of Biodiversity Research (RMBR), National University of Singapore,
Department of Biological Sciences, 6 Science Drive 2, #03-01, Singapore 117546,
Republic of Singapore
ABSTRACT
A new species of terrestrial potamid crab, Malayopotamon lipkei sp. nov., is described
from Gunung Slamet, Central Java, Indonesia. This new species is similar to M. granulatum
(De Man, 1892), but can be differentiated by several characters, viz. the carapace with longer
anterolateral serrated crest margins, the relatively larger and the denser granules on branchial
and gastric regions, more prominent epigastric lobes, males with proportionately broadly
abdominal somites III-V, more granulated chelipeds, and distal segment of G1 bent inwards
at about 30◦ .
RÉSUMÉ
Une nouvelle espèce de crabe terrestre Potamidae, Malayopotamon lipkei sp. nov., est
décrite de Gunung Slamet, Java centrale, Indonésie. Cette nouvelle espèce est similaire
à M. granulatum (De Man, 1892), mais peut s’en distinguer par plusieurs caractères tels
que: la carapace avec des bords en crêtes serrulés plus longues antérieurement, les régions
branchiales et gastriques relativement plus grandes et avec une plus forte densité de granules,
les lobes épigastriques plus proéminents, chez les mâles les somites abdominales III-V
proportionellement élargis, des pinces plus granuleuses et la partie distale du G1courbée vers
l’intérieur d’environ 30◦ .
3 ) Corresponding author; e-mail: [email protected]
4 ) e-mail: [email protected]
© Koninklijke Brill NV, Leiden, 2010
Studies on Malacostraca: 727-734
728
CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME
INTRODUCTION
Of the 10 known species of Malayopotamon Bott, 1968 (Ng et al., 2008),
only two have been reported from Java, i.e. M. granulatum (De Man, 1892)
and M. javanense (Bott, 1968). Both species are only known from West Java
Province thus far (De Man, 1892; Bott, 1968, 1970; Ng & Tan, 1999). They
are usually montane or submontane species and are sometimes found together
especially in Cibodas Botanical Garden, Cianjur Regency at 1400 m asl. The
most eastern known distribution for M. granulatum is Kuningan Regency
in West Java at the border with Central Java (see material examined). In
this paper, a new species of Malayopotamon is described from Central Java
Province.
The material examined is deposited in Museum Zoologicum Bogoriense
(MZB), Research Center for Biology, Indonesian Institute of Sciences, Cibinong, Indonesia; and Zoological Reference Collection (ZRC), Raffles Museum
of Biodiversity Research, National University of Singapore. The Indonesian
terms “Sungai” abbreviated as Sg., refers to river, stream or tributary, “Gunung” is abbreviated as Gn. referring to mountain, “Kampung” is abbreviated
as Kp. referring to village. The terminology used here follows Ng (1988) and
Ng et al. (2008). The abbreviations G1 and G2 refer to the first and second
male gonopods, respectively.
TAXONOMIC ACCOUNT
Family P OTAMIDAE Ortmann, 1896
Genus Malayopotamon Bott, 1968
Malayopotamon lipkei sp. nov.
(figs. 1A-C, 2A, 3A)
Material examined. — Holotype: male (43.6 × 37.7 mm) (MZB Cru 2902), Banyumas
Regency, Batur Raden District, Gn. Slamet, Sg. Kracakan, Kp. Ketengger, 07◦ 18.837′ S
109◦ 12.313′ E, coll. Heryanto & U. Nurhaman, 20 May 2009. Paratypes: 1 male (27.2 ×
23.5 mm) (ZRC), Banyumas Regency, Batur Raden District, Gn. Slamet, Sg. Serengseng, Kp.
Ketengger, coll. Heryanto & U. Nurhaman, 24 May 2009; 1 female (29.6 × 26.0 mm) (MZB
Cru 2903), Banyumas Regency, Batur Raden District, Gn. Slamet, Sg. Kalipagu, Kp. Ketengger,
coll. Heryanto & U. Nurhaman, 19 May 2009; 2 females (33.2 × 28.9-23.1 × 20.4 mm),
1 juvenile (16.8 × 14.4 mm) (MZB Cru 2904), Banyumas Regency, Batur Raden District,
Gn. Slamet, Sg. Akar, around pine forest, Kp. Ketengger, 07◦ 18.682′ S 109◦ 12.880′ E, coll.
Heryanto & U. Nurhaman, 22 May 2009. Others: 7 females (60.9 × 50.6-50.3 × 42.9 mm)
(ZRC), from aquarium trade in Singapore, supposedly collected from Cilacap, 5 May 2009. All
localities in Central Java Province, Indonesia.
Wowor & Tan, NEW MALAYOPOTAMON FROM CENTRAL JAVA
729
Fig. 1. A-C, Malayopotamon lipkei sp. nov., holotype, male (43.6×37.7 mm) (MZB Cru 2902);
D-F, Malayopotamon granulatum (De Man, 1892), male (45.4 × 37.6 mm) (MZB Cru 2905).
A, D, ventral view of left G1; B, E, dorsal view of left G1; C, F, left G2. Scales = 2 mm.
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Fig. 2. Overall views. A, Malayopotamon lipkei sp. nov., holotype, male (43.6 × 37.7 mm)
(MZB Cru 2902); B, Malayopotamon granulatum (De Man, 1892), male (40.3 × 35.2 mm)
(ZRC 2008.0438).
Comparative material. — Malayopotamon granulatum (De Man, 1892): 1 male (45.4 ×
37.6 mm), 1 female (15.1 × 34.1 mm) (MZB Cru 2905), Indonesia, West Java Province, Cianjur
Regency, Cipanas District, Sg. Ciismun, Cibodas Botanical Garden, coll. D.C. Murniati &
N. Mujiono, 8 June 2006; 1 male (56.1 × 47.5 mm) (MZB Cru 2906), Indonesia, West Java
Province, Kuningan Regency, Sg. Cibuluh, tributary of Sg. Cicangkrung, coll. I. Rachmatika,
8 April 2006; 2 males (47.3 × 39.8-42.4 × 35.8 mm) (MZB Cru 2907), Indonesia, West Java
Province, Cianjur Regency, Cipanas District, Cibodas, alt. 1400 m asl, coll. T. van Benthem
Jutting, December 1930; 1 male (50.1 × 38.9 mm) (ZRC 1984.7058), Indonesia, West Java
Province, Cianjur Regency, Cipanas District, Cibodas, January 1935; 1 male (40.3 × 35.2 mm)
(ZRC 2008.0438), Indonesia, West Java Province, Cianjur Regency, Cipanas District, Cibodas,
coll. P.K.L. Ng, 13 June 1990; 1 ovigerous female (37.7 × 31.9 mm), 7 juveniles (ZRC
2000.1076), Indonesia, West Java Province, Sukabumi Regency, Sg. Cimaracun, tributary to
Lake Situ Gunung, coll. H.H. Tan, 3 October 1999; 10 males (19.2 × 16.6-39.6 × 32.6 mm)
(ZRC 2000.1233), Indonesia, West Java Province, Sukabumi Regency, Cisaat, coll. H.H. Tan &
D. Wowor, 2-3 October 1999.
Wowor & Tan, NEW MALAYOPOTAMON FROM CENTRAL JAVA
731
Fig. 3. Ventral views of thoracic sternites. A, Malayopotamon lipkei sp. nov., female (60.9 ×
50.6 mm) (ZRC), aquarium trade, supposedly from Cilacap; B, Malayopotamon granulatum
(De Man, 1892), ovigerous female (37.7 × 31.9 mm) (ZRC 2000.1076).
Diagnosis. — Carapace subquadrate, smooth, branchial and gastric regions
densely granulated, ovate and rounded granules large; anterolateral margins
732
CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME
convex, crested; posterolateral margins converging towards posterior carapace
margin; anterolateral regions with no striae; posterolateral regions with few
long but low but distinct striae; posterior carapace margin straight; anterolateral regions lightly striated, epibranchial tooth distinct, low, separated from
external orbital tooth by shallow cleft; outer margin of external orbital tooth
straight, slightly serrated; epigastric lobes distinct, granulated, not continuous
with postorbital cristae; postorbital cristae prominent, sharp, continuous with
base of epibranchial tooth. G1 terminal segment subquadrilateral, bent inward
about 30◦ with jagged anterior margin.
Description. — Carapace subquadrate, anterior half wider than posterior
half; width 1.23-1.26 times length (mean = 1.25, n = 5); branchial, gastric and intestinal regions relatively swollen; branchial and gastric regions
densely granulated, ovate and rounded granules large; other parts of dorsal
surface smooth, glabrous. Gastric regions relatively swollen, not raised above
orbital region. Epigastric lobes distinct, granulated, no distinct crista, not continuous with postorbital cristae; postorbital cristae prominent, continuous with
base of epibranchial tooth; cervical and H-shaped gastric grooves distinct. Orbital region narrow. Frontal margin sinuous, smooth, with medial notch, more
prominent in larger specimens; supraorbital and infraorbital margins crested,
crista relatively smooth. Suborbital and pterygostomial regions swollen, granulated, granules low, glabrous. External orbital angle tooth small, low, triangular; anterolateral margin convex laterally, low crista present, smooth, serrated
crest margin reach widest part of carapace; epibranchial tooth low but present.
Epistome concave laterally, with median triangular lobe. Cornea of eye about
same length as eyestalk, slight constriction present at junction of cornea and
eyestalk. Third maxilliped rectangular; ischium with shallow median groove,
length about 4 times merus width; lateral margin of merus slightly projected
medially; exopod reaching to about one-third length of merus, with well developed flagellum, about half width of merus.
Cheliped asymmetrical, outer surfaces with smooth low tubercles; carpus
with sharp spine on inner margin, a low basal tubercle usually present below
spine; merus with 2 rows of ventral cristae, outer margin more strongly
tuberculated than inner. Fingers slightly longer than palm in larger male
specimens.
Ambulatory legs (second to fifth pereopods) relatively long, second ambulatory legs longest; legs generally glabrous; meri long, without distal tooth on
anterior margins; propodi with few short setae; dactyli of legs with rows of
short stiff setae on dorsal and ventral margins.
Wowor & Tan, NEW MALAYOPOTAMON FROM CENTRAL JAVA
733
Thoracic sternites II-IV smooth, with a few short setae. Thoracic sternites
II-III and III-IV demarcated by shallow grooves. Penis coxal. Female gonopore
crescent-shaped. Male abdomen with 6 free somites and telson, broadly
triangular; telson triangular, lateral margins with slight medial notch.
G1 stout, distal part of terminal segment subquadrilateral, bent inwards
about 30◦ with jagged anterior margin. G2 relatively long, well developed
distal segment, about two-thirds length of basal segment.
Life colour. — Carapace and ambulatory legs are reddish–purplish brown,
with the chelipeds reddish light brown.
Ecological notes. — The specimens were collected from middle part of
Gunung Slamet from 670 to 780 m asl. They were found under large rocks
on sandy substrate, in the middle of streams with clear fast running water. The
streams pass through rice fields with no canopy cover.
Etymology. — This new specific name is dedicated to the late Prof. Lipke
B. Holthuis, a carcinologist of great skill, knowledge and experience. He has
contributed so much to the knowledge of both authors, for which we are very
grateful. In addition, Prof. Holthuis was born in Probolinggo in Java, which
makes this tribute extra special.
Discussion. — The new species is morphologically most similar to M.
granulatum (De Man, 1892). However, the new species can be distinguished
by several characters. The carapace of M. lipkei sp. nov. is relatively more
granulated, especially on the gastric and branchial regions, with the granules
proportionately larger and denser, and a mix of ovate and rounded granules
(versus with smaller and widely spaced granules of a more rounded and pearllike appearance in M. granulatum). The anterolateral serrated crest margins
is also proportionately longer, reaching up to the widest part of the carapace
(versus shorter, reaching only about half the length of the anterolateral margins
in M. granulatum); the posterolateral regions have relatively fewer long and
short striae (versus low short striae in M. granulatum); the epigastric lobes
are more prominent; the demarcation lines between thoracic sternites IV
and V reach about one-third the proximal lateral margins of telson (versus
reaching a quarter of the proximal lateral margins in M. granulatum); the
abdominal somites III-V are strongly trapezoidal in shape (versus less so in
M. granulatum); and proportionately shorter abdominal somite V which is
about half as long as abdominal somite VI (versus distinctly more than half
in M. granulatum); the chela with proportionately larger and densely arrange
granules; the distal segment of G1 is bent inwards for about 30◦ (versus straight
in M. granulatum); and the distal segment of the G2 is about two-thirds as
734
CRM 014 – Fransen et al. (eds.), LIPKE BIJDELEY HOLTHUIS MEMORIAL VOLUME
long as the basal segment (versus about half length of basal segment in M.
granulatum).
Although both Malayopotamon lipkei and M. granulatum are montane
species; M. lipkei is known from relatively lower altitudes between 670 to
780 m asl; while M. granulatum has been found thus far only at around 1400 m
asl.
ACKNOWLEDGEMENTS
The authors are grateful to Heryanto and Ujang Nurhaman of the Research
Center for Biology, Indonesian Institute of Sciences who collected the specimens of this interesting new species during their field work at Gunung Slamet,
Central Java for our study. We also thank Peter Ng of the National University
of Singapore whose valuable comments improve greatly this paper. The field
work was funded by the government of Indonesia through the Research Center
for Biology, Indonesian Institute of Sciences to both collectors. The first author
was supported by a Raffles Museum Fellowship from the National University
of Singapore.
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First received 28 November 2009.
Final version accepted 1 March 2010.