Henricia exigua Hayashi, 1940

Xiao, Ning, Liao, Yulin & Liu, Ruiyu, 2011, Records of the genus Henricia Gray, 1840 (Echinodermata: Asteroidea: Echinasteridae) from Chinese waters, Zootaxa 3115, pp. 1-20 : 8-9

Henricia exigua Hayashi, 1940

Figures 6 A–F, 12F

Henricia exigua Hayashi, 1940: 138 , pl. 7, figs 5, 6.

Material examined. East China Sea. Twelve (R 27– 20 mm, r 5.7 mm, R: r 4.7–3.5; R 26– 19 mm, r 6.4 mm, R: r 4.1–3.0; R 27– 22 mm, r 5.2 mm, R: r 5.2–4.2; R 22– 19 mm, r 4.8 mm, R: r 4.6–4.0; R 19– 17 mm, r 3.8 mm, R: r 5.0–4.5; R 26– 23 mm, r 5.0 mm, R: r 5.2–4.6; R 25– 21 mm, r 5.2 mm, R: r 4.8–4.0; R 18– 16 mm, r 4.1 mm, R: r 4.4–3.9; R 20– 17 mm, r 4.2 mm, R: r 4.8–4.0; R 20– 16 mm, r 4.4 mm, R: r 4.5–3.6; R 16– 15 mm, r 3.6 mm, R: r 4.4–4.2; R 15– 13 mm, r 2.9 mm, R: r 5.2–4.5), MBM175698, CN KY16B-43, Stn. ZI-1, 32°00ʹN, 127°20ʹE, 133m, fine sand, coll. XU, AT, 6 Aug 1981; Eight (R 27– 21 mm, r 6.6 mm, R: r 4.1–3.2; R 27– 25 mm, r 6.4 mm, R: r 4.2– 3.9; R 33– 28 mm, r 6.5 mm, R: r 5.1–4.3; R 28– 24 mm, r 6.0 mm, R: r 4.7–4.0; R 27– 24 mm, r 6.4 mm, R: r 4.2– 3.8; R 18– 16 mm, r 3.7 mm, R: r 4.9–4.3; R 21– 20 mm, r 5.6 mm, R: r 3.8–3.6; R 27– 23 mm, r 5.8 mm, R: r 4.7– 4.0), MBM175712, CN V560B-9, Stn. 0 2, 32°30ʹN, 127°00ʹE, 120m, fine sand, AT, coll. ZHANG, 29 May 1978; Seven (R 27– 24 mm, r 6.5 mm, R: r 4.2–3.7; R 25– 24 mm, r 6.6 mm, R: r 3.8–3.6; R 23– 21 mm, r 5.5 mm, R: r 4.2–3.8; R 20– 18 mm, r 5.2 mm, R: r 3.8–3.5; R 22– 18 mm, r 5.0 mm, R: r 4.4–3.6; R 20– 18 mm, r 4.3 mm, R: r 4.7–4.2; R 16– 14 mm, r 3.5 mm, R: r 4.6–4), MBM175704, CN V554B-6, Stn. -7, 28°30ʹN, 126°30ʹE, 126m, fine sand, AT coll. TANG & XU, 21 Sep 1976; One (R 25 mm, r 6.4 mm, R: r 4.0), MBM175702, CN V485B-57, Stn. -8, 29°30ʹN, 127°00ʹE, 107m, medium sand, AT, coll. LIU, 27 Jun 1976; One (R 18– 14 mm, r 4.5 mm, R: r 4.0–3.1), MBM175693, CN V553B-61, Stn. -8, 29°30ʹN, 127°00ʹE, 114m, fine sand, AT, coll. TANG & KAI, 20 Sep 1976.

Distribution. East China Sea, southern Japan, 107– 366 m.

Remarks. This species has a small disc, slender arms, 5 to 13 fine spinelets in groups ( Fig. 6 C), 13 to 15 subadambulacral spines and two furrow spines ( Fig. 6 D) in a vertical series ( Hayashi 1940). These small specimens examined here accord closely with the original description of the species by Hayashi (1940) except that our specimens sometimes possess 5 to 10 subadambulacral spines.

Figures

FIGURE 6. Henricia exigua Hayashi. A, abactinal view; B, actinal view; C, abactinal ray. Note a few abactinal spinelets; D, actinal ray. Note two furrow spines; E, cleared abactinal ray showing abactinal plates arranged irregularly; F, cleared actinal ray.