A new species of Matuta Weber, 1795 (Crustacea: Decapoda: Matutidae) from Java, Indonesia

2007·0.52 MB·English

by  C Y Lai, Joelle

THE RAFFLES BULLETIN OF ZOOLOGY 2007
THE RAFFLES BULLETIN OF ZOOLOGY 2007 Supplement No. 16: 75–77
Date of Publication: 31 Dec.2007
© National University of Singapore
A NEW SPECIES OF MATUTA WEBER, 1795
(CRUSTACEA, DECAPODA, MATUTIDAE) FROM JAVA, INDONESIA
Joelle C. Y. Lai
Department of Biological Sciences, National University of Singapore,
14 Science Drive 4, Singapore 117543, Republic of Singapore
Email: [email protected]
Bella S. Galil
National Institute of Oceanography, Israel Oceanographic and Limnological Research
P.O.B. 8030, Haifa 31080, Israel
Email: [email protected]
ABSTRACT. – The collection of matutid crabs at the Zoological Reference Collection of the Raffles Museum
of Biodiversity Research, National University of Singapore, Singapore, was re-examined and a new species,
Matuta purnama, was identified. It closely resembles M. circulifera in its color pattern, but is easily
distinguished in the disposition of the reddish circles, the smooth external surface of the chela, and structure
of the mid palmar ridge, and the spinose lower margin of the periopodal meri. The new species is described,
photographed and illustrated.
KEY WORDS. – Calappidae, Matuta, new species, Java Sea.
INTRODUCTION part of carapace. Gastric and cardiac regions separated from
branchial regions by shallow, sinuous longitudinal grooves.
All three known species of the genus Matuta Weber, 1795 Anterolateral margin arcuate, dentate; 3-4 anterior teeth small,
have been collected in Indonesia: M. circulifera Miers, 1880, conic, three posteriormost teeth large. Lateral spine long (0.4
M. planipes Fabricius, 1798, and M. victor (Fabricius, 1781) carapace width), acuminate, slightly upcurved, proximally
(Galil & Clark, 1994). Examination of material collected by granulate on upper surface. Posterolateral margins oblique,
Mr. Chan Sow Yan, an amateur malacologist, from the sharply convergent, beaded posteriorly. Posterior margin
southern coast of Java, disclosed the presence of an additional rounded, beaded.
species. The new species is described, photographed and
illustrated. The holotype is deposited in the Museum Front slightly wider than orbit, projecting, trilobate, median
Zoologicum Bogoriense, Java (MZB), and the paratype in lobe anteriorly emarginate. Orbits communicating with
the Zoological Reference Collection of the Raffles Museum antennular fossa. Outer orbital angle prominently produced.
of Biodiversity Research, Singapore (ZRC). Suborbital margin tuberculate, laterally interrupted by curved
inhalant canal. Inner orbital tooth prominent, visible in dorsal
Abbreviations: CL – carapace length, measured along the view. Antennules obliquely folded. Antennae small, slender,
vertical median line of the carapace. lodged in orbital hiatus. Eyes retractable, eyestalk setose.
Buccal frame ogival, narrowing anteriorly. Thick fringe of
plumose setae running the length of third maxilliped exopod;
Matuta purnama, new species exopod and ischium of endopod granulate. Subhepatic region
(Figs. 1a, b, 2a, b) anteriorly tomentose, with rows of lozenge-shaped granules,
serving as stridulating organ. Sternum unevenly granulose,
Material examined. – Holotype, male (CL 32.3 mm)(MZB Cru with crescentic indentations anterolaterarlly. Male abdomen
1537); Indonesia, Batu Karas, south central Java, coll. Chan Sow five-segmented, tapering, with prominent granulate carina on
Yan. Paratype, male (CL 34.2 mm)(ZRC 2005.75); same data. third abdominal segment.
Description. – Carapace subcircular, slightly convex, regions
Chelipeds massive, subequal. Upper margin of manus crested,
poorly marked. Dorsal surface with low granulation laterally,
tridentate, proximal tooth keel-like, granulate, distal teeth
and on six obtuse protuberances. Mesogastric region highest
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Lai & Galil: New species of Matuta from Java
triangular. External surface of manus convex, sculptured,
bearing four pairs of tubercles near base of crest, and oblique
ridge mid-palm extending from acute proximal spine to
pollex. Lower margin with row of conic tubercles
successively smaller proximally, distal most keel-like. Upper
margin of dactylus crested, setose, external surface bearing
strongly milled ridge with 30 striae, larger medially. Pollex
with molar tooth. Inner surface of chela with stridulating
organ consisting of ridge of 7 short striae proximally, 5 longer
striae distally near upper margin. Pereiopods 2–5 natatory,
laterally compressed, propodi greatly expanded, bearing
triangular tooth on lower margin; lower margin of pereiopodal
meri 2–4 trispinous. Upper margin of pereiopodal carpi 3–
5 unicarinate, periopodal carpus 3 anteriorly spinose. Dactyli
2 and 5 greatly expanded, 3 and 4 leaf-shaped.
First male pleopod stocky, tapering evenly, distally spinulose,
with funnel-shaped appendage on inner surface. Second male
pleopod long, slender, straight, distally cornute.
Colour in alcohol. – Carapace dorsally covered with short
vermiculate lines and dots, and six prominent pale centered
reddish circles, three on protogastric region, two branchial,
and one on metagastric region. Pereiopodal meri, propodi
distally spotted, as well as second and last dactyli.
Etymology. – The species is derived from the Sanskrit word
Fig. 1. Matuta purnama, new species, male paratype, CL 34.2 mm, for full moon, purnama, and used as a noun in apposition.
(ZRC2005.0075); a, dorsal view; b, left cheliped, external surface.
Fig. 2. Matuta purnama, new species, male paratype, CL 34.2 mm, (ZRC2005.0075); a, 1st pleopod; b, 1st pleopod, side view and c, back
view. Scale = 1 mm.
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THE RAFFLES BULLETIN OF ZOOLOGY 2007
Remarks. – Matuta purnama resembles M. circulifera also LITERATURE CITED
known from Indonesia in its general colour pattern, but is
easily distinguished in the number and disposition of the Fabricius, J. C. 1781. Species Insectorum exhibentes eorum
reddish circles on the carapace (six in M. purnama versus differentias specificas, synonyma auctorum, loca natalia,
eight in M. circulifera), the smooth instead of granular metamorphosis adjectis observationibus, descriptionibus, 2:, ii
+ 517 pp. Hamburg and Kilonii.
external surface of the chela structure of the mid palmar ridge
and spinose lower margin of the periopodal meri, which is Fabricius, J. C., 1798. Supplementum Entomologiae systematicae.
smooth in M. circulifera. Proft et Storch, Hafniae. 573 pp.
Galil, B. S. & P. F. Clark, 1994. A revision of the genus Matuta
Distribution. – Known only from type locality, Java. Weber, 1795 (Crustacea: Brachyura: Calappidae). Zoologische
Verhandelingen, 294: 1–55, Figs. 1–7, Pls. 1–14.
Miers, E. J. 1880. On a collection of Crustacea from the Malaysian
ACKNOWLEDGEMENTS Region. Part II. Telphusidae, Catometopa, and Oxystomata.
Annals and Magazine of Natural History, 5: 304–317.
The authors thank Chan Sow Yan for presenting the Weber, F., 1795. Nomenclator entomologicus secundum
specimens to the Zoological Reference Collection of the entomologiam systematicum ill. Fabricii, adjectis speciebus
Raffles Museum, and to Daisy Wowor for suggesting the recens detectis et varietatibus, viii + 172 pp. Chilonii [Kiel] &
specific name. This work is supported by an NUS research Hamburgi.
grant (RP 154-000-183-112) to Peter K. L. Ng.
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