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

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.10988724

persistent identifier

https://treatment.plazi.org/id/6515E623-0A06-1E34-3996-6647FD96969D

treatment provided by

Plazi

scientific name

Hansenocaris undetermined
status

 

Y-nauplius Type AO

Figs 2 View Fig , 19F–G View Fig

Material examined

JAPAN – Okinawa, Sesoko I., laboratory pier, 26°38ʹ09.4ʺ N, 127°51ʹ55.2ʺ E GoogleMaps • 1 LSN; 1991–2005 ( Tables 1 and S1 View Table 1 ).

Description

LAST-STAGE NAUPLIUS (LSN). Lecithotrophic. Body shape lanceolate in dorso-ventral view; about 2.2 times as long as wide; lateral margins tapering gradually towards caudal end, with very slight narrowing apparent at posterior end of cephalic shield. No lateral view obtained, but longitudinal axes of cephalon, trunk and dorso-caudal spine apparently in nearly same plane. Length 366 µm (based on exuvia on slide, without dorso-caudal spine), greatest width 170 µm, greatest dorso-ventral thickness unknown but body apparently rather flattened. Labrum not examined in detail but with straight posterior margin and with surface undivided into facets; pores not examined. Caudal end attenuate, terminating in 90 µm long, spinose dorso-caudal spine accompanied by slightly more ventrally and forward-positioned pair of ca 17 µm long furcal spines.

CYPRID VIEWED THROUGH CUTICLE OF LSN. The only available information on live specimens is from the slide label, which reports that the tip of the [cyprid] tail is brown.

Identification and variation

Recognizable by its great length relative to width, relatively long and slender dorso-caudal spine and relatively long furcal spines.

Distribution

Japan (Sesoko Island, Okinawa).

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