A new cryptic species of Asteronyx Müller and Troschel, 1842 (Echinodermata: Ophiuroidea), based on molecular phylogeny and morphology, from off Pacific Coast of Japan
| Autor: | Masanori Okanishi, Asuka Sentoku, Toshihiko Fujita, Alexander Martynov |
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| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Species complex Asteronyx loveni Phylogenetic tree Zoology Morphology (biology) Biology 010603 evolutionary biology 01 natural sciences Analysis of molecular variance 03 medical and health sciences Phylogeography 030104 developmental biology Genetic distance Molecular phylogenetics Animal Science and Zoology |
| Zdroj: | Zoologischer Anzeiger. 274:14-33 |
| ISSN: | 0044-5231 |
| Popis: | The first phylogenetic and phylogeographic studies of the cosmopolitan deep-sea species, Asteronyx loveni Muller and Troschel, 1842, were conducted, based on specimens collected from off the Pacific coast of Japan. Partial sequences of mitochondrial 16S (68 specimens) and COI (24 specimens) genes were analyzed. Phylogenetic trees and network analyses revealed three lineages and five sub-lineages of A. loveni. Genetic distance and AMOVA (analysis of molecular variance) analyses suggested that the lineages should be considered three cryptic species. Skin on the aboral disc is partly thickened and forms a mesh-like pattern, which has never been reported in previous descriptions of Asteronyx; this is provided as a new taxonomic character. Based on absence/presence of mesh-like skin, one of the three lineages was assigned to A. loveni and another was described as Asteronyx reticulata new species. This new species can be distinguished from congeners by having mesh-like skin and small genital slits at the innermost position on the interradial oral disc. |
| Databáze: | OpenAIRE |
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