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Two new cave false-spider crabs from Indonesia (Brachyura: Hymenosomatidae)

May 21, 2009

In April 2008, the taxonomic paper about the false spider crabs had been published in ZOOTAXA (1739:21-40) wrote by Tohru Naruse, P.K.L. Ng and Daniel Guinot with title : “Two new genera and two new species of troglobitic false spider crabs (Crustacea: Decapoda: Brachyura: Hymenosomatidae) from Indonesia, with notes on Cancrocaeca Ng, 1991”

Two new genera and two new species of troglobitic false spider crabs
(Crustacea: Decapoda: Brachyura: Hymenosomatidae) from Indonesia,
with notes on Cancrocaeca Ng, 1991

The paper is described two new genera and two new species false spider crabs from Muna Island and Sangkulirang, East kalimantan.

The first genus is Sulaplax from caves in Muna Island with the species namely Sulaplax ensifer Naruse, Ng & Guinot 2008

Sulaplax ensifer

Sulaplax ensifer from caves in Muna Island, SE Sulawesi (Indonesia) (Ph. C. Rahmadi

Genus Sulaplax is derived from “Sula” the name of the island Sulawesi for and “plax” for the meaning of “plate” . The species of Sulaplax ensifer is derived from Latin “ensifer” meaning “carrier of a sword” that a morphology of blade-like finger of chela (Naruse, Ng and Guinot 2008).

Sulaplax ensifer is a species from Muna Island as a first time collected in 2001 during the join ecpedition with French Scientist. The specimens in 2001, are collected from small spring that Franck Brehier “the collector” collected specimens with snorkeling in the small cave passage. Brehier said that the specimens are collected on the roof of the small siphon. In 2007, during the joint expedition between Indonesian scientist (Dr. Daisy Wowor and me) and French (Franck Brehier), British (Prof. Dr. Geoff Boxshall), Spanish (Dr. Damia) and Australian (Dr. Stephan Eberhard), more specimens from different cave are collected during the fieldwork in Muna Island. It is showed that the diversity of cave fauna in Indonesia are still unexplored and still many undescribed.

The second genus is Guaplax from cave in Sangkulirang Karst, Kalimantan Timur with the species namely Guaplax denticulata Naruse, Ng & Guinot 2008.

Guaplax denticulata from Sangkulirang, Kalimantan Timur

Guaplax denticulata , a false spider crab from cave in East Kalimantan. The specimens are collected during the expedition in Sangkulirang karst TNC-LIPI-MNHN (Ph. C. Rahmadi)

Guaplax is derived from Indonesian word “Gua” meaning cave and plax meaning a plate. The species name Guaplax denticulata is derived from Latin denticulatus meaning “bearing small teeth”.

Guaplax denticulata is collected from the small cave in Tabalar Ulu, East Kalimantan on the formation of Sangkulirang karst. The species is collected in the small pond on the cave river bank. The species is only known from single site in the cave as wel as single cave in East Kalimantan.

Close species previously known from caves in maros namely Cancrocaeca xenomorpha Ng, 1991

Cancrocaeca xenomorpha from caves in MAros Karst, South Sulawesi

Cancrocaeca xenomorpha from caves in MAros Karst, South Sulawesi

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