Hansenocaris undetermined

Olesen, Jørgen & Grygier, Mark J., 2024, Taxonomic diversity of marine planktonic ‘ y-larvae’ (Crustacea: Facetotecta) from a coral reef hotspot locality (Japan, Okinawa), with a key to y-nauplii, European Journal of Taxonomy 929 (1), pp. 1-90 : 50-51

publication ID

https://doi.org/ 10.5852/ejt.2024.929.2479

publication LSID

lsid:zoobank.org:pub:832192E7-A85A-4971-BA2F-D7420D299E8D

DOI

https://doi.org/10.5281/zenodo.10988726

persistent identifier

https://treatment.plazi.org/id/6515E623-0A06-1E37-3994-63BCFBA99051

treatment provided by

Plazi

scientific name

Hansenocaris undetermined
status

 

Y-nauplius Type AM

Figs 2 View Fig , 19H View Fig

Material examined

JAPAN – Okinawa, Sesoko I. , laboratory pier, 26°38ʹ09.4ʺ N, 127°51ʹ55.2ʺ E • 1 LSN; 2018–2019 ( Tables 1 and S1 View Table 1 ). GoogleMaps

Description

LAST-STAGE NAUPLIUS (LSN). Lecithotrophic. Body lollipop-shaped in dorso-ventral view; about 1.6 times as long as wide; cephalic shield large and circular, with sharp discontinuity in body outline leading into trunk. In lateral view, longitudinal axes of cephalon, trunk and dorso-caudal spine in approximately same plane. Length 420 µm (without dorso-caudal spine), greatest width ca 260 µm, dorso-ventral thickness not measured but body apparently quite flattened. Labrum not examined in detail. Caudal end attenuate, terminating in ca 160 µm long, smooth dorso-caudal spine flanked ventrally at base by pair of small, thorn-like furcal spines ca 20 µm long.

CYPRID VIEWED THROUGH CUTICLE OF LSN. Body overall weakly brownish but with lateral margins of cephalon and terminal part of telson distinctly darker brown. Gut-like tube packed with yellow yolk granules, these being markedly concentrated in central part of cephalon. Telson about as long as wide and less than half as long as thorax.

Identification and variation

Easily recognizable by its general form, especially the large rounded cephalic shield and very long, smooth dorso-caudal spine, and by the cyprid’s distinct pattern of brown pigmentation. Only one specimen was available, so variation could not be checked.

Distribution

Japan (Sesoko Island, Okinawa); Taiwan (Green Island) (unpublished).

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF