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 : 26-27

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.10988676

persistent identifier

https://treatment.plazi.org/id/6515E623-0A2E-1E1F-39A9-62D6FD9690F8

treatment provided by

Plazi

scientific name

Hansenocaris undetermined
status

 

Y-nauplius Type AC

Figs 2 View Fig , 9F–H View Fig

Type AC – Dreyer et al. 2023a: figs 4, 5a, c, tables s1–s2.

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; 1.8 times as long as wide; cephalic shield elliptical, with sharp discontinuity in body outline leading into trunk. In lateral view, trunk axis downturned ca 35° with respect to cephalic axis. Length ca 270 µm (ventral view in life, without dorso-caudal spine), greatest width 160 µm, greatest dorso-ventral thickness ca 115 µm. Labrum with goblet-shaped outline; in ventral view with free posterior margin extended into large medial spine, preceded by ca six large, equal-sized posteriorly directed spines on labral midline; pore pattern not examined. Caudal end attenuate, terminating in robust, 67 µm-long dorso-caudal spine set with smaller spines and accompanied ventrally at base by pair of triangular furcal spines ca 12 µm long; long axis of dorso-caudal spine upturned 25° with respect to trunk axis.

CYPRID VIEWED THROUGH CUTICLE OF LSN. Body weakly brownish, with thick strand of orange yolk granules in gut-like central tube. Other details not discernable in the single specimen examined.

Identification and variation

Recognizable by the combination of its general shape, size and spiny-keeled labrum.

Distribution

Japan (Sesoko Island, Okinawa).

Kingdom

Animalia

Phylum

Arthropoda

Class

Maxillopoda

SubClass

Facetotecta

Family

Hansenocarididae

Genus

Hansenocaris

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