Acodontaster hodgsoni ( Bell, 1908 )
publication ID |
https://doi.org/ 10.11646/zootaxa.5310.1.1 |
publication LSID |
lsid:zoobank.org:pub:C6664128-1B4E-40C8-80E8-6D09AB49CB30 |
DOI |
https://doi.org/10.5281/zenodo.8090166 |
persistent identifier |
https://treatment.plazi.org/id/03C387E8-6616-FFC4-FF68-E58E8774F84D |
treatment provided by |
Plazi |
scientific name |
Acodontaster hodgsoni ( Bell, 1908 ) |
status |
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Acodontaster hodgsoni ( Bell, 1908) View in CoL View at ENA
FIGURE 12A – G View FIGURE 12
Heuresaster hodgsoni, Bell, 1908: 8 View in CoL .
Acodontaster hodgsoni, Fisher 1940: 115 View in CoL ; A.M. Clark 1962: 20; H.E.S. Clark 1963: 38.
Diagnosis
Body stellate, R/r=2.3–3.3, Arms triangular in cross-section, but also in outline, overall shape elongate, arm tips acutely tapering. Interradial arcs acute ( Fig. 12A, C View FIGURE 12 ). Disk edge distinct, rounded and compressed. Abactinal plates flattened to weakly convex. Surface covered by granules, flattened, quadrate to polygonal, distinctly angular in shape ( Fig. 12D, G View FIGURE 12 ). Granular cover is continuous and obscures boundaries between adjacent plates. Pedicellariae absent from abactinal surface. Marginal plates forming lateral edge, covered by granules identical, if slightly larger than those on abactinal surface, some with small tubercles ( Fig. 12B View FIGURE 12 ). Actinal surface in chevron-like arrangement, but distal plates adjacent to the inferomarginal series obscured by continuous cover of granules ( Fig. 12E View FIGURE 12 ), identical to similar with those on abactinal and marginal plate surface. Proximally, especially around the mouth, plates covered by numerous, small spines, 5–10 centrally, 15 around the edge. Most central spines conical, pointed, widely spaced. Spine height variable with tallest spines 2–3× the height of others. Simple fasciculate pedicellariae present on adambulacral plates adjacent to the mouth, but otherwise no pedicellariae on actinal surface. Furrow spines 2–5, subambulacral spines 2–3. Furrow and subambulacral spines elongate, thickened, remaining subambulacral spines, 3–6, short, approximately 25% of subambulacral spine height, some forming fasciculate pedicellariae. Oral plates each with a single, stout distal-pointing hyaline spine with two shorter, flanking spines ( Fig. 12F View FIGURE 12 ), furrow spines 7–8, suboral spines 7 to 8 ( Fig. 12G View FIGURE 12 ).
Color in life orange to white.
Comments
A single specimen of this species from 2350 m was examined. A.M. Clark (1962) reported a depth occurrence between 4 to 457 m [540 m for A. hodgsoni stellatus ( Koehler, 1920) ], making this an exceptional occurrence. Unfortunately, only a single specimen was recovered. It is hoped that further specimens will close the large disparity in depth for although plausible, the discontinuity between the known and this new occurrence requires additional verification.
Occurrence
Enderby Land eastwards to the Ross Sea and from South Georgia to Queen Mary Land. 4–457m (540 m). New Depth Occurrence: 2350 m.
Material Examined
USNM 1082873, Southern Ocean, Antarctica, −74.1, −175.025, 2350 m. Coll. R/V Eltanin, 8 Feb. 1968. 1 dry spec. R=7.7 r=2.3.
USNM |
Smithsonian Institution, National Museum of Natural History |
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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Genus |
Acodontaster hodgsoni ( Bell, 1908 )
Mah, Christopher L. 2023 |
Acodontaster hodgsoni
Clark, H. E. S. 1963: 38 |
Clark, A. M. 1962: 20 |
Fisher, W. K. 1940: 115 |
Heuresaster hodgsoni
Bell, F. J. 1908: 8 |