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Article
Published: 2021-07-05

A new species of Hetereleotris (Teleostei: Gobiidae) from the Socotra Archipelago (north-western Indian Ocean), a rare case of a hole-associated adaptation in gobiid fishes

Natural History Museum Rijeka, Lorenzov prolaz 1, HR–51000 Rijeka, Croatia.
Senckenberg Research Institute and Museum of Nature (SMF), Section Ichthyology & Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Biogeography – Senckenberganlage 25, 60325 Frankfurt am Main, Germany.
Senckenberg Research Institute and Museum of Nature (SMF), Section Ichthyology & Senckenberg Biodiversity and Climate Research Centre (SBiK-F), Biogeography – Senckenberganlage 25, 60325 Frankfurt am Main, Germany. Institute for Ecology, Diversity and Evolution, Faculty of Biological Sciences, Goethe University Frankfurt am Main, Max-von-Laue-Straße 13, 60438 Frankfurt am Main, Germany;
School of Aquatic and Fishery Sciences and the Burke Museum of Natural History and Culture, University of Washington, 1122 NE Boat Street, Seattle, WA 98105, USA.
Pisces Arabian Sea phylogenetic analysis endemics cryptobenthic species

Abstract

A new cryptobenthic gobiid species Hetereleotris nasoramosa sp. nov. is described based on the holotype and five paratypes collected from the north-eastern part of Socotra Island, Arabian Sea, from moderately large pieces of coral rocks with holes at depths of 8–11 m. Molecular phylogenetic analysis placed the new species within the genus Hetereleotris. Hetereleotris nasoramosa sp. nov., differs from all species of Hetereleotris in having developed tentacles extending from each anterior and posterior nostril and five transverse suborbital papillae rows (instead four or six in other species). The new species superficially resembles the recently described Red Sea endemic species Cerogobius petrophilus by having forward-set, elevated eyes, a short snout, a moderately large mouth, a relatively deep and short caudal peduncle, and developed tentacles on the head, but differs from it by the same characters of developed tentacles extending from each anterior and posterior nostril and five transverse suborbital papillae rows as from other Hetereleotris species. Both species also share a specific habitat preference for tight holes in rock covered by micro-algae. A full description of the species is provided as well as a revised key to the species of Hetereleotris.

 

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