Hansenocaris cristalabri Olesen & Grygier, 2022

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 : 24-25

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.10954156

persistent identifier

https://treatment.plazi.org/id/6515E623-0A20-1E1D-3AFA-64DCFD969307

treatment provided by

Plazi

scientific name

Hansenocaris cristalabri Olesen & Grygier, 2022
status

 

Hansenocaris cristalabri Olesen & Grygier, 2022

Figs 2 View Fig , 5C View Fig , 9A–B View Fig

Hansenocaris cristalabri Olesen & Grygier, 2022: 304 View Cited Treatment , figs 1–5, tables 1–2.

Hansenocaris cristalabri – Dreyer et al. 2023b: fig. 1d.

One of “three known larval types of ‘y-larvae’” – Olesen 2024: fig. in upper right corner on p. 17.

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 spoon-shaped in dorso-ventral view; about twice as long as wide (without dorso-caudal spine); cephalic shield broadly rounded, with sharp discontinuity in body outline leading into trunk. In lateral view, body only slightly bent, trunk axis downturned 15–20° relative to cephalic axis. Length ca 330 µm (ventral view in life, without dorso-caudal spine), greatest width 180 µm, greatest dorso-ventral thickness ca 100 µm. Labrum with goblet-shaped outline in ventral view and posterior margin free; labral surface divided into facets by cuticular ridges; midline of labrum extending ventrally as huge, cockscomb-like, spine-bearing crest. Cephalic shield with spines bordering pair of pits at postero-lateral corners. Trunk dorsum with two longitudinal rows of spines. Caudal end attenuate, terminating in 120 µm long, robust, and conical dorso-caudal spine armed with smaller spines and accompanied ventrally at base by pair of curved, 15 µm long furcal spines; dorso-caudal spine upturned 20° relative to trunk axis.

CYPRID VIEWED THROUGH CUTICLE OF LSN. Body weakly brownish with darker brown pigmentation in parts of thorax and telson. Telson less than half as long as thorax.

Identification and variation

Easily recognizable by its huge and unique labral crest-like process, the spines near the postero-lateral corners of the cephalic shield, the two longitudinal rows of spines dorsally on the trunk and the very long, robust and distinctly spinose dorso-caudal spine.

Distribution

Japan (Sesoko Island, Okinawa).

Kingdom

Animalia

Phylum

Arthropoda

Class

Maxillopoda

Family

Hansenocarididae

Genus

Hansenocaris

Loc

Hansenocaris cristalabri Olesen & Grygier, 2022

Olesen, Jørgen & Grygier, Mark J. 2024
2024
Loc

Hansenocaris cristalabri

Olesen J. & Grygier M. J. 2022: 304
2022
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