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 : 39

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.10988700

persistent identifier

https://treatment.plazi.org/id/6515E623-0A11-1E23-39A2-6636FD969794

treatment provided by

Plazi

scientific name

Hansenocaris undetermined
status

 

Y-nauplius Type L

Figs 2 View Fig , 15A–F View Fig

Type L – Dreyer et al. 2023a: figs 3, 5a, c, tables s1–s2.

Material examined

JAPAN – Okinawa, Sesoko I. , laboratory pier, 26°38ʹ09.4ʺ N, 127°51ʹ55.2ʺ E • 8 LSN, 3 of which molted to cyprids; 2018–2019 ( Tables 1 and S1 View Table 1 ). GoogleMaps

Description

LAST-STAGE NAUPLIUS (LSN). Lecithotrophic. Body narrowly ovate, almost lanceolate in dorso-ventral view; about 1.8 times as long as wide; lateral margins without marked discontinuity in body outline between cephalic shield and trunk. In lateral view, trunk axis downturned 20° with respect to cephalic axis. Length 270–290 µm (of short form, see below) (without dorso-caudal spine), greatest width ca 150 µm, greatest dorso-ventral thickness ca 100 µm. Labrum produced as nearly equilateral sub-triangular elevation; divided into facets by cuticular ridges; pore pattern not examined in detail but three pores present in midline. Caudal end attenuate, terminating in ca 50–60 µm long, basally annulate but essentially smooth dorso-caudal spine, this being bent slightly upwards (5°) with respect to trunk axis and accompanied ventrally by pair of small, pointed furcal spines ca 6–7 µm long.

CYPRID VIEWED THROUGH CUTICLE OF LSN. Body overall with strong brown pigmentation. Telson portion of gut-like tube with orange yolk granules. Telson longer than wide and more than half as long as thorax.

Identification and variation

Recognizable by the combination of its general shape, small furcal spines and strong brown pigmentation. Four specimens are ca 270 µm long, but four others are 360–380 µm long with more robust dorso-caudal spines than the smaller ones, suggesting that this morphospecies may consist of two separate species.

Distribution

Japan (Sesoko Island, Okinawa).

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