Hansenocaris undetermined
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.10988708 |
persistent identifier |
https://treatment.plazi.org/id/6515E623-0A1D-1E2E-39AB-637EFD969052 |
treatment provided by |
Plazi |
scientific name |
Hansenocaris undetermined |
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Figs 2 View Fig , 17A–E View Fig
Undescribed form-taxa of lecithotrophic y-larvae – Grygier et al. 2019 pars: 1228, fig. 3f.
Type AF – Dreyer et al. 2023a: figs 4, 5a, c, tables s1–s2. — Olesen et al. 2024: fig. 2c.
Material examined
JAPAN – Okinawa, Sesoko I. , laboratory pier, 26°38ʹ09.4ʺ N, 127°51ʹ55.2ʺ E • 2 LSN; 1991–2005 GoogleMaps • 12 LSN, 8 of which molted to cyprids; 2018–2019 ( Tables 1 and S1 View Table 1 ).
Description
LAST-STAGE NAUPLIUS (LSN). Lecithotrophic. Body short, with unusually bloated trunk region; widely ovate in dorso-ventral view; about 1.35 times as long as wide; cephalic shield very widely ovate, with sharp discontinuity in body outline leading into trunk. In lateral view, trunk axis downturned ca 60° with respect to cephalic axis. Length 210–240 µm (ventral view in life, without dorso-caudal spine), greatest width ca 170 µm, greatest dorso-ventral thickness ca 130 µm. Labrum conical in lateral view and drawn into hypodermic-needle like distal extension; other features of labrum not examined. Caudal end truncate, terminating in broad, conical, ca 40 µm long dorso-caudal spine directed postero-dorsally, with its axis upturned ca 50° from trunk axis, and ventral pair of triangular furcal spines ca 5 µm long, these being widely separated both from each other and from dorso-caudal spine, sitting on distinct, conical bases.
CYPRID VIEWED THROUGH CUTICLE OF LSN. Overall weakly brownish, but more distinctly brown in telson region. Gut-like tube filled with yolk granules; some of these partly brown or black but those in telson often colored orange; some specimens with additional lipid vesicles spread out within cephalon and smaller vesicles behind compound eyes. Telson small.
Identification and variation
Easily recognizable by its bloated or blimp-like form, conical labrum with hypodermic-needle-like extension and extremely robust, conical dorso-caudal spine. Some variation exists in the size of the dorso-caudal spine and its angle of orientation with respect to the trunk axis.
Distribution
Japan (Sesoko Island, Okinawa).
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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