Henricia echinata 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 echinata; Alaska; Aleutian Islands
• Online Access: https://doi.org/10.5281/zenodo.6197344; http://treatment.plazi.org/id/03DA070DBB781216FF113C2FFBB7FCE0

Henricia echinata spec. nov. Figures 42–46 Type locality: Alaska, Aleutian Islands, Andreanof Islands, Adak Island, Bay of Isles (51º 49.023 N, 176º 50.385 W), 13 m. (AKALE 07-0005). Type material: Holotype, LACM 2007-098.001( leg. R.N. Clark, 1 July, 2007). Diagnosis: Small, moderately inflated, R to 5.3 cm, R:r 4.8; abactinal skeleton irregular, open meshwork; abactinal plates with 5–11 blunt rather smooth spines; adambulacrals with 8–11 slender, blunt spines, 1 at furrow edge, followed by 2 slightly shorter spines, and 2 irregular rows of 3–4 shorter shorter spines; oral plates with 4–5 marginal and 1 or 2 sub-oral spines; Color in life, red. Description: Small, moderately inflated, R 5.5 cm, r 1.1 cm, R:r 5.0 cm (Figs. 42 & 43); disc small, rays relatively short, tapering to slender, blunt tips. Abactinal plates forming an irregular, open reticulation (Fig. 44); pseudopaxillae bearing 5–11 short, thick, blunt, smooth spines in two irregular rows; spines to about 0.2 mm long; madreporite small, with irregular spinose ridges; papular area large, with 2–4 papulae per area. Superomarginals about 2–3 times larger than abactinals, and bearing 9–15 spines; intermaginals about half as large as superomarginals, and forming an irregular series extending 35–50% or R; inferomarginals about 1/3 larger than superomarginals, chevron-shaped and bearing 15–21 spines. Actinal iterradial plates less than 1/2 the size of inferomarginal, in a series extending about 75% of R, and bearing 7–12 spines. Adambulacrals (Fig. 45) with a single slender, deep furrow spine, 1 long slender spine at furrow edge backed by 2 similar but somewhat shorter spines, and then 2 rows of 3–4 shorter spines. Oral plates (Fig. 46) with 4–5 long, thick, blunt marginal spines, and 1–2 similar, slightly shorter sub-orals. Color in life uniformly reddish. Distribution: Alaska, Aleutian Islands, Andreanof Islands, Adak Island, 16 m. Known so far only from the central Aleutians, the Holotype at Adak Island, and an image of a second specimen from Amchitka ...