Abstract
Three new species of the genus Laomenes A.H. Clark are described as symbionts of feather stars (Crinoidea: Comatulida) from shallow waters of Nhatrang Bay, Vietnam. Including these new species, the genus comprises 8 species and can be arranged into 3 suggested groups of species. The “L. amboinensis” species group with 4 species, L. amboinensis (De Man, 1888), L. cornutus (Borradaile, 1915), L. clarki sp. nov. and L. pardus sp. nov., characterized by the presence of ventral rostral teeth, distoventral spines on propodus of pereiopod III and a fixed tooth on distolateral margin of uropodal exopod. The “L. jackhintoni” species group includes 2 species, L. jackhintoni (Bruce, 2006) and Laomenes tigris sp. nov., characterized by the absence of ventral rostral teeth, extremely elongated apical papilla on cornea of eyes, the presence of fixed tooth on exopod of uropod, the absence of distoventral spines on propodus and the presence of large accessory tooth on dactylus of pereiopod III. The “L. ceratophthalmus” species group includes 2 species, L. ceratophthalmus (Borradaile, 1915) and L. nudirostris (Bruce, 1968), characterized by the absence of ventral rostral teeth and distoventral spines on propodus of pereiopod III, the presence of small accessory tooth on dactylus of pereiopod III, tiny marginal dorsal spines on telson and the absence of a fixed distolateral tooth on exopod of uropod. Remarks and a key for all species of the genus as well as a discussion of the undescribed diversity of the genus are given.References
Ameziane, N. & Roux, M. (2005) Biodiversity and historical biogeography of stalked crinoids (Echinodermata) in the deep sea. Biodiveristy & Conservation, 6 (11), 1557–1570.
Borradaile, LA. (1915) Notes on Carides. Annals and Magazine of Natural History, 8, 205–213.
Borradaile, L.A. (1917) On the Pontoniinae. The Percy Sladen Trust Expedition to the Indian Ocean in 1905, under the leadership of Mr. J. Stanley Gardiner. Transactions of the Linnean Society of London, Zoology, 17 (2), 323–396.
Bruce, A.J. (1968) A report on some pontoniid shrimps from New Caledonia. Bulletin du Museum National d’Histoire Naturelle, 39 (6), 1148–1171.
Bruce, A.J. (1971) Records of some rare pontoniinid shrimps from Australian waters, with remarks upon the mouthparts of some species of the genus Periclimenes Costa, 1844. Zoologische Mededelingen, 114, 1–32.
Bruce A.J. (1974) A report on a small collection of pontoniinid shrimps from the Island of Farquhar. Crustaceana, 27, 189–203.
Bruce, A.J. (1978) The re-examination of some pontoniine shrimps types first described by L.A. Borradaile (Decapoda, Palaemonidae). Crustaceana, 34 (3), 251–268
Bruce, A.J. (1980) Some pontoniine shrimps from Nouméa, New Caledonia. Cahiers de l’Indo-Pacifique, 1 (2), 215–248.
Bruce, A.J. (1981) Pontoniine shrimps of Heron Island. Atoll Research Bulletin, 245, 1–33.
Bruce, A.J. (1982) The shrimps associated with Indo-Pacific echinoderms, with the description of a new species in the genus Periclimenes Costa (Crustacea, Pontoniinae). Australian Museum Memoir, 16, 192–216.
Bruce A.J. (1983) Expedition Rumphius II (1975). Crustaces parasites, commensaux, etc. IX: Crustaces Decapodes (1ere partie: Natantia Pontoniinae). Bulletin du Museum National d’Histoire Naturelle, Paris, Serie 4, 5A, 871–902.
Bruce, A.J. (1992) Two new species of Periclimenes (Crustacea: Decapoda: Palaemonidae) from Lizard Island, Queensland, with notes on some related taxa. Records of Australian Museum, 44, 45–84.
Bruce, A.J. (2006) Periclimenes jackhintoni sp. nov. (Crustacea: Decapoda: Palaemonidae), a new pontoniine shrimp and crinoid associate from Tonga. The Beagle, Records of the Museums and Art Galleries of the Northern Territory, 22, 23–29
Bruce, A.J. (2007) A revision of the generic status of Periclimenes jackhintoni Bruce, 2006, with a new key to the genus Laomenes Clark (Crustacea: Decapoda: Palaemonidae). Zootaxa, 1432, 67–68
Clark, A.H. (1919) Some necessary changes in crustacean nomenclature. Proceedings of Biological Society of Washington, 32, 199.
Debelius, H. (1999) Crustacea Guide of the World. IKAN Unterwasserarchiv, Frankfurt, 321 pp.
Fujita, Y. & Baba, K. (1999) Two galatheid associates of crinoids from the Ryukyu Islands (Decapoda: Anomura: Galatheidae), with their ecological notes. Crustacean Research, 28, 112–124.
Holthuis, L.B. (1952) The Decapoda of the Siboga Expedition. Part XI. The Palaemonidae collected by the Siboga and Snellius Expeditions with remarks on other species. II. Subfamily Pontoniinae. Siboga Expedition Monograph, 39a, 10, 1–252.
Kemp, S. (1922) Notes on Crustacea Decapoda in the Indian Museum. XV. Pontoniinae. Records of the Indian Museum, 24, 113–288.
Kemp, S. (1925) Notes on Crustacea Decapoda in the Indian Museum, XVII: on various Caridea. Records of the Indian Museum, 27, 249–343.
Man, J.G., de (1888) Bericht uber die von Herrn Dr. J. Brock im Indischen Archipel gesammelten Decapoden und Stomatopoden. Archiv fur Naturgeschiche, 53, 215–600.
Marin, I.N. (2006) Description of Crinotonia anastassiae, new genus, new species, a new crinoid associated pontoniine shrimp (Crustacea: Caridea) from Nha Trang Bay, Viet Nam, with inclusion of Periclimenes attenuatus Bruce, 1971 in the new genus. Raffles Bulletin of Zoology, 54 (2), 321–340.
Marin, I. & Chan, T.–Y. (2006) Two new genera and a new species of crinoid-associated pontoniine shrimps (Decapoda: Caridea: Palaemonidae). Journal of Crustacean Biology, 26 (4), 524–539.
Marin, I.N. & Savinkin, O.V. (2007) Further records and preliminary list of pontoniine (Caridea: Palaemonidae: Pontoniinae) and hymenocerid (Caridea: Hymenoceridae) shrimps from Nhatrang Bay. In: Britayev T.A. & D.S. Pavlov (eds), Benthic fauna of the Bay of Nhatrang, Southern Vietnam, KMK-Press, Moscow, 175–208.
Marin, I. (2008) Notes on ecological difference between cryptic species of pontoniine genus Crinotonia Marin, 2006 (Caridea: Palaemonidae: Pontoniinae) associated with shallow water feather stars Phanogenia spp. (Crinoidea: Comasteridae). Zootaxa, 1764, 19–24.
Meyer, D.L. & Macruda, D.B. (1980) Ecology and distribution of the shallow-water crinoids (Echinodermata) of the Palau Islands and Guam (Western Pacific). Micronesica, 16, 59–99.
Messing, C.G. (1994) Comatulid crinoids (Echinodermata) of Madang, Papua New Guinea, and environs: Diversity and ecology. In: David B., Guille A., Feral J.–P. & Roux M. (eds), Echinoderms through Time. Balkema, Rotterdam, 237–243.
Messing, C.G. (1998) An initial re-assessment of the distribution and diversity of the East Indian shallow-water crinoid fauna. In: Mooi R. & M. Telford (eds), Echinoderms: San Francisco. Balkema, Rotterdam, 187–192.
Miyake, S. & Fujino, T. (1968) Pontoniid shrimps from Palau Islands. Journal of the Faculty of Agriculture, Kyushu University, 14 (3), 399–431.
Okuno, J. & Fujita, Y. (2007) Resurrection of the genus Laomenes A. H. Clark, 1919 (Decapoda, Caridea, Palaemonidae). Crustaceana, 80 (1), 113–124
Tchesunov, A.V., Britayev, T.A., Larionov, V.V., Khodkina, I.V. & Tzetlin, A.B. (1989) Notes on commensals of some crinoids from Maldives coral reefs. In: Sveshnikov, V.A. (ed), Symbiosis in Marine Animals. Moscow, 166–191.