A new species of the Y-larva genus Hansenocaris Itô, 1985 (Crustacea: Thecostraca: Facetotecta) from the Azores, with notes on its morphology and biogeography
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- A new species of the Y-larva genus Hansenocaris Itô, 1985 (Crustacea Thecostraca Facetotecta) from the Azores, with notes on its morphology and biogeography
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A new facetotectan species, described herein as Hansenocaris spiridonovi Kolbasov, Savchenko et Høeg sp.n. and based on its cypridiform stage, was found in the plankton off Azores Islands. We employed scanning electron microscopy to document the fine-scale external morphology of this species. We discuss the findings of facetotectan larvae showing cosmopolitan distribution of these crustaceans. The presence of Y-cyprid exuviae in plankton, findings of y-larvae in the deep sea plankton, occurrence in the oceanic plankton, as well as their permanent presence in the tropical waters may evidence on a pelagic host.
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Arthropoda Selecta |
| Vol/bind | 30 |
| Udgave nummer | 3 |
| Sider (fra-til) | 341-350 |
| Antal sider | 10 |
| ISSN | 0136-006X |
| DOI | |
| Status | Udgivet - 2021 |
Bibliografisk note
Funding Information:
1. Abdomen two-segmented ....... Hansenocaris tentaculata – Abdomen four-segmented ................................................ 2 2. Anterior end of carapace strongly produced, antennular hook absent ................................................................... 3 – Anterior end of carapace round or slightly produced, an-tennular hook present ................................................... 4 3. Anterior end of carapace sharp, six telsonic spines ......... ................................................................... H. acutifrons – Anterior end of carapace blunt, five telsonic spines ......... ....................................................................... H. rostrata 4. Carapace elongate, its posterior ends reaching abdomen ....................................................................................... 6 – Carapace short, its posterior ends not reaching abdomen ....................................................................................... 5 5. Anterior end of carapace with ventral papilliform protru-sions, cuticular ridges feeble ...................... H. papillata – Anterior end of carapace without ventral papilliform pro-trusions, cuticular ridges developed ............................... ......................................................... H. spiridonovi sp.n. 6. Antennular aesthetasc constricted at mid-length, posterior ends of carapace reaching telson .......................... H. itoi – Antennular aesthetasc not constricted at mid-length, pos-terior ends of carapace not reaching telson .................. 7 6. Entire surface of carapace covered by cuticular ridges ... ....................................................................... H. pacifica – Cuticular ridges absent in dorsal part of carapace ............ ...................................................................... H. furcifera Acknowledgements. We thank the collaborators of the Laboratory of Electronic Microscopy of Moscow State University for assistance in SEM studies. For GAK and ASS this work was financially supported by the Russian Foundation for Basic Research (grant 21-54-52003 MNT_a). We are indebted to anonymous referees for comments and criticism.
Publisher Copyright:
© ARTHROPODA SELECTA, 2021
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