Özet:

Coral-associated crab Trapezia cheni Galil, 1983 (Decapoda: Brachyura: Trapeziidae) is firstly recorded from the Nhatrang Bay and coastal waters of Vietnam increasing the area of distribution greatly to the south. Previously, the species has been known from Taiwan and along coasts of China in the South China Sea. The record increase the number of trapezoid crabs known from Nhatrang Bay up to 22 with 10 species of the genus Trapezia that close to mostly diverse localities - Mollucca Islands and French Polynesia. Trapezia cheni is one of the smallest species in the genus and inhabit colonies of Pocillopora verrucosa (Ellis & Solander, 1786) (Cnidaria: Scleractinia: Pocilloporidae) influenced in tidal zone by strong waves thereby avoiding competition with larger Trapezia species inhabiting deeper dwelling coral colonies. Keywords: Crustacea; Decapoda; Trapezia; corals; symbiosis; Pocillopora; high energy reef ecosystems; Nhatrang Bay; Vietnam References: Castro, P. (1996). Eastern Pacific species of Trapezia (Crustacea, Barchyura, Trapeziidae), sibling species symbiotic with reef corals. Bulletin of Marine Sciences, 58(2), 531-554. Castro, P. (1997a). Trapeziid crabs (Brachyura: Xanthoidea: Trapeziidae) of New Caledonia, eastern Australia, and the Coral Sea. In: Richer de Forges B. (ed.) Les fonds meubles des lagons de Nouvelle-Calédonie (Sédimentologie, Benthos). Études et Thèses, 3, 59-107. Castro, P. (1997b). Trapeziid crabs (Brachyura: Xanthoidea: Trapeziidae) of French Polynesia. In: Richer de Forges B. (ed.) Les fonds meubles des lagons de Nouvelle-Calédonie (Sédimentologie, Benthos). Études et Thèses, 3, 109-139. Castro, P. (1999a). Trapeziid crabs (Crustacea, Brachyura, Trapeziidae) of the Indian Ocean and the Red Sea. Zoosystema, 21(1), 93-120. Castro, P. (1999b). The Trapeziidae (Crustacea: Brachyura: Xanthoidea) of Indonesia. Results of the Rumphius Biohistorical Expedition to Ambon (1990). Part 6. Zoologische Mededelingen, 73(3), 27-61. Castro, P. (2000). Biogeography of trapeziid crabs (Brachyura, Trapeziidae) symbiotic with reef corals and other cnidarians. In: von Vaupel Klein J.C., Schram F.R. The Biodiversity Crisis and Crustacea. Proceedings of the Fourth International Crustacean Congress, Amsterdam, vol. 2. Crustacean Issues, 12, 65-75. Castro, P., Ng, P. K. L., & Ahyong, Sh. T. (2004). Phylogeny and systematics of the Trapeziidae Miers, 1886 (Crustacea: Brachyura), with the description of a new family. Zootaxa, 643, 1-70. Chang, K.-H, Chen, Y.-S. & Chen, C.-P. (1987). Xanthid crabs in the corals, Pocillopora damicornis and P. verrucosa of southern Taiwan. Bulletin of Marine Science, 41, 214-220. Dai, A., & Yang, S. (1991). Crabs of the China seas. China Ocean Press, Beijing and Springer-Verlag, Berlin. 682 p. Dai, A., Song, Y., Chen, G., & Yang, S. (1983). On the crabs of the Xisha Islands - Xanthidae. Stud. Mar. Sin., 20, 231-261 [In Chinese with English summary]. Dai, A., Yang, S., Song, Y. and Chen, G. (1986). Crabs of Chinese seas. China Ocean Press, Beijing. 642 p. [In Chinese]. Galil, B. (1983). Two new species of Trapezia (Decapoda: Brachyura), coral-inhabiting crabs from Taiwan. Micronesica, 19(1/2), 123-129. Galil, B. (1988b). Trapeziidae (Decapoda: Brachyura: Xanthoidea) of the Red Sea. Israel Journal of Zoology, 34, 159-182. Galil, B., & Clark, P.F. (1988). On a collection of Acropora-inhabiting trapeziids (Crustacea Brachyura Xanthoidea) from East Africa. Tropical Zoology, 1, 137-151. Galil, B., & Clark P. F. (1990). Crustacea Decapoda: Notes on trapeziid crabs from New Caledonia including descriptions of two new species. In: Crosnier A. (ed). Résultats des Campagnes MUSORSTOM, 6, Mémoires du Muséum National dHistoire Naturelle (Paris) sér. A, 145, 369-388. Galil, B., & Lewinsohn, C. (1985). On the taxonomic status of Trapezia rufopunctata (Herbst) and Trapezia flavopunctata Eydoux & Souleyet (Decapoda, Brachyura). Crustaceana, 48(2), 209-217. Galil, B., & Vannini, M. (1990). Research on the coast of Somalia. Xanthidae, Trapeziidae, Carpilidae, Menippidae (Crustacea Brachyura). Tropical Zoology, 3, 21-56. Marin, I. (2007a). Diversity of the genus Pontonides (Caridea, Palaemonidae, Pontoniinae) in Nhatrang Bay, Vietnam, with description of new taxa. Zootaxa, 1635, 1-21. Marin, I. (2007b). Pontoniine shrimps (Caridea: Palaemonidae, Pontoniinae) inhabiting boring sponges (Demospongia: Porifera) in Vietnam with description of three new species. Zoologische Mededelingen, 81, 217-240. Marin, I. N. (2007c). A new genus and species of pontoniine shrimps (Caridea: Palaemonidae: Pontoniinae) associated with plumularid hydroids (Hydroidea, Plumularidae) in Vietnam. Zoosystema, 29(4), 775-786. Marin, I. (2009a). A review of pontoniine shrimp genus Rapipontonia Marin, 2007 (Decapoda: Caridea: Palaemonidae), with the description of a new species from the Indo-West Pacific. Zootaxa, 2289, 1-17. Marin, I. (2009b). Crinoid-associated shrimps of the genus Laomenes A.H. Clark, 1919 (Caridea: Palaemonidae: Pontoniinae): new species and probable diversity. Zootaxa, 1971, 1-49. Marin, I. N. (2012a). New records and associations of pontoniine shrimps (Crustacea: Decapoda: Caridea: Palaemonidae: Pontoniinae) from the Nhatrang Bay, Vietnam; with taxonomic remarks on some species from the Indo-West Pacific region. In: Britayev T.A., Pavlov D.S. (Eds.). Benthic fauna of the Bay of Nhatrang, Southern Vietnam. Moscow, KMK, 2, 345-405. Marin, I. (2012b). A new species of the genus Philarius Holthuis, 1952 (Crustacea: Decapoda: Palaemonidae) from the Great Barrier Reef of Australia. Zootaxa, 3182, 43-50. Marin, I. (2014). A new species of the pontoniine shrimp genus Hamopontonia Bruce, 1970 associated with caryophyllid coral Euphyllia glabrescens (Chamisso & Eysenhardt, 1821) in Nhatrang Bay, Vietnam. Zootaxa, 3815(1), 131-140. Marin, I. N., & Spiridonov, V. A. (2007). Corall-associated crabs (Decapoda: Domecidae, Trapeziidae, Tetraliidae, Xanthidae: Cymoinae) from Nhatrang Bay. In: Britayev T.A. & D.S. Pavlov (eds). Benthic fauna of the Bay of Nhatrang, Southern Vietnam. KMK-Press, Moscow, 209-234. Seréne, R. (1968). The Brachyura of the Indo-West Pacific Region. In: Prodromus for a check-list of non-planktonic marine fauna of South-East Asia. Singapore National Academy of Sciences, Special Publication 1. Fauna. IIICc3, 33-112.

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