Open Access Open Access  Restricted Access Subscription or Fee Access


Aletheiana tenella, a new genus and new species of freshwater hymenosomatid crab (Crustacea: Decapoda: Brachyura) from Central Sulawesi, Indonesia



A new genus and new species of free-living hymenosomatid crab, Aletheiana tenella, is described from Central Sulawesi, Indonesia. The two known Sulawesi hymenosomatid species, Cancrocaeca xenomorpha Ng, 1991, and Sulaplax ensifer Naruse, Ng & Guinot, 2008, are both from cave habitats. Aletheiana gen. nov. is most similar to Neorhynchoplax Sakai, 1938 (from freshwater and intertidal habitats in the Indo-West Pacific), and Sulaplax, but can be distinguished by its front possessing only one subventral rostral lobe, the base of the antenna is positioned between the base of the ocular peduncle and antennular fossa, the posterior margin of the epistome has two low, rounded median lobes, the merus of the third maxilliped is elongated, the ambulatory dactylus has a prominent subdistal spine, the cutting edges of the chela are armed with distinct teeth proximally, and the male abdomen is slender and elongate with the telson linguiform.



Crustacea, Hymenosomatidae, Aletheiana tenella, new genus, new species, taxonomy, Sulawesi

Full Text:

PDF/A (3.43 MB)


Abele, L.G. (1972) Introductions of two freshwater decapod crustaceans Hymenosomatidae and Atyidae) into Central and North America. Crustaceana, 23 (3), 209–218.

Chia, O.K.S. & Ng, P.K.L. (2006) The freshwater crabs of Sulawesi, with descriptions of two new genera and four new species (Crustacea: Decapoda: Brachyura: Parathelphusidae). Raffles Bulletin of Zoology, 54 (2), 381–428.

Chopra, B. & Das, K.N. (1930) Further Notes on Crustacea Decapoda in the Indian Museum. I. On two new species of hymenosomatid crabs, with notes on some other species. Records of the Indian Museum, 32 (4), 413–429.

Chuang, C.T.N. & Ng, P.K.L. (1991) Preliminary descriptions of one new genus and three new species of hymenosomatid crabs from Southeast Asia (Crustacea: Decapoda: Brachyura). Raffles Bulletin of Zoology, 39 (2), 363–368.

Chuang, C.T.N. & Ng, P.K.L. (1994) The ecology and biology of Southeast Asian false spider crabs (Crustacea: Decapoda: Brachyura: Hymenosomatidae). Hydrobiologia, 285, 85–92.

Davie, P.J.F. & Richer de Forges, B. (1996) Two new species of false spider crabs (Crustacea: Brachyura: Hymenosomatidae) from New Caledonia. Memoirs of the Queensland Museum, 39 (2), 257–262.

Deharveng, L., Guinot, D. & Ng, P.K.L. (2002) Focus: False Spider Cave Crab (Cancrocaeca xenomorpha). ASEAN Biodiversity, Manila, 2 (2), 36.

Guinot, D. (1988) Les crabes cavernicoles du monde. Mémoires de Biospéologie, 15, 3–40.

Guinot, D. (2011a) Odiomarinae nov. subfam., a new subfamily for two plesiomorphic genera of Hymenosomatidae MacLeay, 1838, with preliminary remarks on the family (Crustacea, Decapoda, Brachyura). Zootaxa, 2732, 20–32.

Guinot, D. (2011b) The position of the Hymenosomatidae MacLeay, 1838, within the Brachyura. Zootaxa, 2890, 40–52.

Guinot, D. & Richer de Forges, B. (1997) Affinités entre les Hymenosomatidae MacLeay, 1838 et les Inachoididae Dana, 1851 (Crustacea Decapoda Brachyura). Zoosystema, 19 (2–3), 453–502.

Holthuis, L.B. (1986) Decapoda. In: Botosaneanu, L. (Ed.), Stygofauna Mundi. A Faunistic, Distributional, and Ecological Synthesis of the World Fauna Inhabiting Subterranean Waters (including the Marine Interstitial). E.J. Brill, Leiden, pp. 589–615.

Husana, D.E.M., Tan, S.H. & Kase, T. (2011) A new genus and species of anchialine Hymenosomatidae (Crustacea, Decapoda, Brachyura) from Samar, Philippines. Zootaxa, 3109, 49–59.

Kemp, S. (1917) Notes on Crustacea Decapoda in the Indian Museum. X. Hymenosomatidae. Records of the Indian Museum, 13, 243–279.

Klaus, S., Mendoza, J.C.E., Liew, J.H., Plath, M., Meier, R. & Yeo, D.C.J. (2013) Rapid evolution of troglomorphic characters suggests selection rather than neutral mutation as driver of eye reduction in cave crabs. Biology Letters, 9, 20121098.

Klotz, W. & von Rintelen, K. (2013) Three new species of Caridina (Decapoda: Atyidae) from Central Sulawesi and Buton Island, Indonesia, and a checklist of the islands’ endemic species. Zootaxa, 3664 (4), 554–570.

Lucas, J.S. (1980) Spider crabs of the family Hymenosomatidae (Crustacea; Brachyura) with particular reference to Australian species: systematics and biology. Records of the Australian Museum, 33 (4), 148–247, figs. 1–10.

Lucas, J.S. & Davie, P.J.F. (1982) Hymenosomatid crabs of Queensland estuaries and tidal mud flats, including descriptions of four new species of Elamenopsis A. Milne-Edwards and a new species of Amarinus Lucas. Memoirs of the Queensland Museum, 20 (3), 401–419.

Naruse, T. & Ng, P.K.L. (2007) On the taxonomy of the genus Hymenicoides Kemp, 1917 (Crustacea: Decapoda: Brachyura: Hymenosomatidae), with resurrection of Limnopilos Chuang & Ng, 1991, and descriptions of two new species. Zootaxa, 1621, 17–31.

Naruse, T., Mendoza, J.C.E. & Ng, P.K.L. (2008a) Descriptions of five new species of false spider crabs (Decapoda: Brachyura: Hymenosomatidae) from the Philippines. Marine Biology Research, 4, 429–441.

Naruse, T., Ng, P.K.L. & Guinot, D. (2008b) Two new genera and two new species of troglobitic false spider crabs (Crustacea: Decapoda: Brachyura: Hymenosomatidae) from Indonesia, with notes on Cancrocaeca Ng, 1991. Zootaxa, 1739, 21–40.

Ng, P.K.L. (1988) Elamenopsis mangalis sp. nov., a new species of mangrove‑dwelling hymenosomatid crab from Singapore (Crustacea, Decapoda, Brachyura). Crustaceana, 55 (3), 274–278.

Ng, P.K.L. (1991) Cancrocaeca xenomorpha, new genus and species, a blind troglobitic freshwater hymenosomatid (Crustacea: Decapoda: Brachyura) from Sulawesi, Indonesia. Raffles Bulletin of Zoology, 39 (1), 59–63.

Ng, P.K.L. (2013) Stygothelphusa cranbrooki, a new species of cave crab from Gua Sireh, Sarawak, Malaysia (Crustacea: Decapoda: Brachyura: Gecarcinucidae). Raffles Bulletin of Zoology, 29 (Supplement), 91–97.

Ng, P.K.L. (2015) Neorhynchoplax venusta, a new species of hymenosomatid crab (Crustacea: Decapoda: Brachyura) from Singapore. Raffles Bulletin of Zoology, 31 (supplement), 193–198.

Ng, P.K.L. & Chuang, C.T.N. (1996) The Hymenosomatidae (Crustacea: Decapoda: Brachyura) of Southeast Asia, with notes on other species. Raffles Bulletin of Zoology, 3 (Supplement), 1–82.

Ng, P.K.L., Guinot, D. & Davie, P.J.F. (2008) Systema Brachyurorum: Part I. An annotated checklist of extant brachyuran crabs of the world. Raffles Bulletin of Zoology, 17 (Supplement), 1–286.

Ng, P.K.L., Nesemann, H.F. & Sharma, G. (2011) A new freshwater species of Neorhynchoplax Sakai, 1938 (Crustacea: Decapoda: Hymenosomatidae) from Patna, Bihar, India. Zootaxa, 3063, 53–63.

Ng, P.K.L. & Richer de Forges, B. (1996) The Hymenosomatidae (Crustacea: Decapoda: Brachyura) of New Caledonia, with descriptions of two new genera and two new species. Memoirs of the Queensland Museum, 39 (2), 263–276.

Rahayu, D.L. & Ng, P.K.L. (2004) The Hymenosomatidae (Crustacea, Decapoda, Brachyura) of Timika (Irian Jaya, Indonesia). Zoosystema, 26 (1), 87–94.

Sakai, T. (1938) Studies on the Crabs of Japan. III. Brachygnatha, Oxyrhyncha. Yokendo, Tokyo, 172 pp. [193–364 pp., figs. 1–55, pls. 20–41, Table 1]

Schenkel, E. (1902 Beitrag zur Kenntnis der Dekapodenfauna von Celebes. Verhandlungen der Naturforschenden Gesellschaft Basel, 13, 485–618.

Schubart, C.D. & Ng, P.K.L. (2008) A new molluscivore crab from Lake Poso confirms the multiple colonization of ancient lakes in Sulawesi by freshwater crabs (Decapoda: Brachyura). Zoological Journal of the Linnean Society, 154, 211–221.

Shen, C. (1932) The Brachyuran Crustacea of North China. Zoologica Sinica, Series A (Invertebrates of China), 9 (1), pp. i–x+1–321, pls. 1–9, map. 1. [The Fan Institute of Biology, Peking [= Beijing]]

Takeda, M. & Miyake, S. (1971) A new freshwater crab of the family Hymenosomatidae from the Palau Islands. Researches on Crustacea, 4–5, 157–163.


  • There are currently no refbacks.

ISSN 1175-5326 (Print Edition) & ISSN 1175-5334 (Online Edition)
Published by Magnolia Press, Auckland, New Zealand
A founding journal of Biotaxa