Hansenocaris demodex Olesen, Dreyer, Palero & Grygier, 2022
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.10954148 |
persistent identifier |
https://treatment.plazi.org/id/6515E623-0A38-1E14-3A4B-6041FBF396D2 |
treatment provided by |
Plazi |
scientific name |
Hansenocaris demodex Olesen, Dreyer, Palero & Grygier |
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Hansenocaris demodex Olesen, Dreyer, Palero & Grygier in Olesen et al., 2022
Figs 2 View Fig , 5A–B View Fig , 6A–F View Fig
Hansenocaris demodex Olesen, Dreyer, Palero & Grygier in Olesen et al., 2022: 570 View Cited Treatment , figs 3–15, table 6.
Hansenocaris demodex – Dreyer et al. 2023a: figs. 2, 5a, c, tables 3–6, s1–s2; 2023b: 85, 90, 94, 95, 97–100, 115, 118; 2024: 8, fig. 1. — Olesen et al. 2024 View Cited Treatment : fig. 1.
Material examined
JAPAN – Okinawa, Sesoko I. , laboratory pier, 26°38ʹ09.4ʺ N, 127°51ʹ55.2ʺ E • 1 LSN; 1991–2005 GoogleMaps • 9 LSN, 4 of which molted to cyprids; 2018–2019 ( Tables 1 and S1 View Table 1 ).
Description
LAST-STAGE NAUPLIUS (LSN). Lecithotrophic. Body narrowly ovate, almost lanceolate in dorso-ventral view; subcylindrical and semi-vermiform; about 2.6 times as long as wide; lateral margins tapering gradually towards caudal end with no discontinuity at posterior end of cephalic shield. In lateral view, trunk axis downturned 30° relative to cephalic axis. Length 352–390 µm (without dorso-caudal spine), greatest width 140 µm, greatest dorso-ventral thickness 100 µm. Labrum a triangular elevation twice as long as wide, not divided into facets by cuticular ridges, bearing five pores: two in mid-line centrally, one in mid-line at posterior margin and pair at left and right lateral margins. Caudal end rounded, terminating in short, blunt, mucronate dorso-caudal spine preceded at some distance on ventral surface by pair of tiny furcal spines.
CYPRID VIEWED THROUGH CUTICLE OF LSN. Cyprid body overall brownish-pigmented, most notably in anterior part of cephalic shield, anterior thoracic segments and posterior tip of telson. Orange and brownish yolk granules concentrated in longitudinally-oriented central gut-like tube, this being broadened somewhat in telson, much more so in anterior part of thorax. Pair of lipid vesicles present laterally in cephalic shield. Telson large, about as long as thorax, narrowly cordate in dorso-ventral view with anterior end wider than thorax and with rounded posterior margin.
Identification and variation
Easily recognizable based on the combination of its elongate, semi-vermiform shape, brown or yellow color, elongate labral region, short, blunt dorso-caudal spine, small furcal spines and (within the LSN) the cyprid’s very long, posteriorly rounded telson. Olesen et al. (2022) described morphological variation among LSN specimens in the size and bluntness of the dorso-caudal spine, the symmetry of the cephalic shield’s facet array and the pigmentation of the cyprid developing within the LSN (Sesoko Island: brownish; Green Island: yellowish; such also being the coloration of earlier naupliar stages). The minor molecular variation between all sequenced specimens tends to confirm their conspecificity (Olesen et al. 2022; Dreyer et al. 2023a).
Distribution
Japan (Sesoko Island, Okinawa), Taiwan (Green Island and Xiaoliuqiu Island).
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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Hansenocaris demodex Olesen, Dreyer, Palero & Grygier
Olesen, Jørgen & Grygier, Mark J. 2024 |