Two new species of shrimp of the Indo-West Pacific genus Hamodactylus Holthuis, 1952 (Crustacea: Decapoda: Palaemonidae)

European Journal of Taxonomy. 2016;0(188) DOI 10.5852/ejt.2016.188


Journal Homepage

Journal Title: European Journal of Taxonomy

ISSN: 2118-9773 (Print)

Publisher: Consortium of European Natural History Museums

LCC Subject Category: Science: Zoology | Science: Botany

Country of publisher: France

Language of fulltext: English

Full-text formats available: PDF



Ivona HORKÁ (Department of Biology and Ecology, and Institute of Environmental Technologies, University of Ostrava, Chittussiho 10, CZ-71000 Ostrava and Department of Ecology, Charles University, Viničná 7, CZ-12844 Prague)
Charles H.J.M. FRANSEN (Department of Taxonomy & Systematics, Naturalis Biodiversity Center, P.O. Box 9517, 2300 RA Leiden)
Zdeněk ĎURIŠ (Department of Ecology, Charles University, Viničná 7, CZ-12844 Prague)


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Time From Submission to Publication: 23 weeks


Abstract | Full Text

Two new alcyonacean-associated species, <em>Hamodactylus paraqabai</em> sp. nov. from Papua New Guinea and the Great Barrier Reef and <em>H. pseudaqabai</em> sp. nov. from Indonesia and Malaysia, are described and illustrated. To evaluate the status of the new species and their relationship within the genus <em>Hamodactylus</em> Holthuis, 1952, we combined morphology and phylogenetic analyses based on the cytochrome c oxidase subunit I (COI) mitochondrial gene. Both new species are closely related, with their mutual genetic divergence reaching 3-4%. They are further most related to <em>Hamodactylus aqabai</em> Bruce &amp; Svoboda, 1983, originally described from the Red Sea. Both new species are distinguished from all other congeners by the presence of multiple teeth distally on the cutting edges of the fingers of the first pereiopods, and, in the case of <em>H. paraqabai</em> sp. nov., by a full reduction of the fixed finger on the second pereiopod chela. In <em>H. pseudaqabai</em> sp. nov. the finger is greatly reduced to a small but distinct stub, and the telson bears only a single pair of dorsal spines, as in <em>H. aqabai</em>. A key for the identification of all six currently known species is proposed.