Henricia gemma Clark & Jewett, 2010, spec. nov.

• Main Authors: Clark, Roger N., Jewett, Stephen C.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Asteroidea; Spinulosida; Echinasteridae; Henricia; Henricia gemma; Adak; Bunt; Rat Islands; Alaska; Aleutian Islands
• Online Access: https://doi.org/10.5281/zenodo.6197350; http://treatment.plazi.org/id/03DA070DBB7A1210FF1138E0FBEEFF6B

Henricia gemma spec. nov. Figures 47–52 Henricia sanguinolenta eschrichtii (Müller & Troschel), Fisher, 1911: 276 ( pars ), non Echinaster eschrichtii Müller & Troschel, 1842: 25. Type locality: Alaska, Aleutian Islands, Andreanof Islands, Adak Island, Kuluk Bay, Gannet Rocks (51º 52.215 N, 176º 36.383 E), 16 m. (AKALE 07-A0014). Type material: Holotype, LACM 2007-100.001 ( leg. H. Chenelot, 12 July, 2007); Paratype, USNM 1125121 Alaska, Aleutian Islands, Rat Islands, Rat Island (51º 49.288 N, 178º 07.256 E), 14 m ( leg. R.N. Clark, 1 July, 2007) (AKALE 07-A0031). Diagnosis: Small, inflated, R to 3.4 cm; disc large, rays relatively short, thick at base, tapering sharply to a slender tip; abactinal plates small, tightly spaces, bearing 6–18 thorny spinules; adambulacrals with 4–5 large, thick, blunt spines near furrow edge (arranged 1+2-3+2), followed by 10-16 much finer spines in 3 irregular rows. Oral plates with 5 thick marginal and 10–15 similar sub-marginal spines. Color in life uniformly red or yellow. Description: Small, inflated, R to 3.4 cm (Holotype), r to 1.1 cm, R:r 3–4.3 (Figs 47 & 48); disc broad, inflated, rays short, thick at base, tapering sharply to slender tips. Abactinal plates small, forming a tight reticulation (Fig. 49); pseudopaxillae round to elliptical, bearing 11–32 thorn-tipped spinules; papular areas small, with 1 sometimes 2 papulae per area; madreporite small, located about half way between anus and disc margin, and bearing irregular sub-radial rows of spines. Supreromarginals 2 to 4 times as large as abactinal plates; intermarginal in 2 small, irregular rows, extending about 1/4 of R; inferomarginals about 1/3 larger than superomarginals, and bearing 23–26 spinules. Actinal inter-radial plates about 1/3 or less the size of inferomarginals, extending about 75% of R, a second, smaller series extends only to near the disc margin. Adambulacrals (Fig. 50) with 15–19 spines, a single fairly slender, bunt spine deep in furrow; 1 large thick, blunt spine at edge of furrow with ...