Loài tôm mới ở Vịnh Nha Trang Hamopontonia nhatrangensis

Loài tôm mới Hamopontonia nhatrangensis sp. nov. được phát hiện tại Vịnh Nha Trang vừa mới được công bố trên tạp chí Zootaxa hồi giữa năm 2014

A new species of the pontoniine shrimp genus Hamopontonia Bruce, 1970 associ-ated with caryophyllid coral Euphyllia glabrescens (Chamisso & Eysenhardt, 1821) in Nhatrang Bay, Vietnam
A. N. Severtzov Institute of Ecology and Evolution of RAS, Moscow, Russia. E-mail: coralliodecapoda@mail.ru, vanomarin@yahoo.com
Abstract: Hamopontonia nhatrangensis sp. nov.(Crustacea, Decapoda, Palaemonidae, Pontoniinae) is described from Nhatrang Bay, Vietnam, in association with caryophyllid coralEuphyllia glabrescens(Chamisso & Eysenhardt, 1821) (Hexacorallia, Scleractinia, Caryophyllidae). The new species clearly differs from congeners by morphological features, distinctive coloration and ecologically. Renewed differential key to all known species of the genus Hamopontonia Bruce, 1970 is provided.
Key words: Crustacea, Decapoda, Palaemonidae, Pontoniinae, Hamopontonia, new species, coral-associated, Scleractin-ia, Caryophyllidae, Euphyllia, Pacific, South-China Sea, Nhatrang Bay, Vietnam
Introduction: The pontoniine shrimp genus HamopontoniaBruce, 1970 (Crustacea, Decapoda, Palaemonidae, Pontoniinae) presently includes 4 valid species: H. corallicolaBruce, 1970 (the type species), H. essingtoniBruce, 1986, Hamopontonia fungicolaMarin, 2012 and Hamopontonia physogyraMarin, 2012. All species are known as associates of scleractinian corals (Hexacorallia, Scleractinia) through Indo-Pacific region. Hamopontonia corallicola is widely distributed Indo-Pacific species known in association with different species of the poritid genus Gonioporade Blainville, 1830 (Hexacorallia, Scleractinia, Poritidae) and occasionally on the surface of coral of the genus TurbinariaOken, 1815 (Hexacorallia, Scleractinia, Dendrophyllidae) (Bruce, 1970; Marin, 2012a).Hamopontonia essingtoniis known in association with pocilloporid coral Stylophora pistillataEsper, 1797 (Hexacorallia, Scleractinia, Pocilloporidae) from Port Essington, Northern Australia only (Bruce, 1986). Hamopontonia fungicolaMarin, 2012 is widely distributed species associated with fungiid corals (Hexacorallia, Scleractinia, Fungiidae). Mature individuals of the species are exclusively known in association with anemone-like fungiid coral Heliofungia actiniformis(Quoy & Gaimard, 1833) (Fungiidae), while non-mature transparent individuals or, possibly young males, have been usually observed on the surface of large mushroom corals such as Fungia spp, Herpolithasp. or Ctenaspis echinata(Pallas, 1766) (Fungiidae) (see Marin, 2012a); Hamopontonia physogyraMarin, 2012 is associated with the caryophyllid grape bubble coral Physogyra lichtensteiniMilne-Edwards & Haime, 1851 (Hexacorallia, Scleractinia, Caryophyllidae) and presently known from Lizard Island, the Great Barrier Reef of Australia only (Marin, 2012a). All known species can be clearly separated ecologically (associated with different coral families) and by coloration (see Marin, 2012a). Color differentiation among highly specialized congeners is also known for other pontoniine shrimps, for example, crinoid-associated shrimps of the genus LaomenesAH Clark, 1919 (see Marin, 2009)......
Remarks. The Torch coral Euphyllia glabrescensbelongs to the family Euphyllidae, not the Fungiidae, but the colonies of E. glabrescensand Heliofungia actiniformis(Quoy & Gaimard, 1833) (Hexacorallia, Scleractinia, Fungidae) are greatly similar (see Fig. 5a–c; Veron, 2000). The coloration of the tentacles of E. glabrescensbears a striking resemblance to the coloration of tentacles of H. actiniformis. At the same time, a multi-year survey (2005–2014 years) of coral reef communities in Nhatrang Bay revealed the absence of Heliofungia actiniformisin the Bay and adjacent localitites (Latypov, 2006; Yu. Latypov, I. Marin, pers. observ.) as well as two specialized associated pontoniine shrimp species, H. fungicolaand Cuapetes kororensis(Bruce, 1977), specific to H. actiniformis, have never been observed in the Bay.
This record increase the number of scleractinian coral-associated pontoniine shrimp species known from Nhatrang Bay, Vietnam up to 31, while H. fungicolashould be excluded from the list (Marin & Anker, 2005; Marin, 2007b, 2008; reviews in Marin & Savinkin, 2007 and Marin, 2013).
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Theo Zootaxa3815 (1): 131–140