Hymenaster giboryi Perrier, 1894

García-Guillén, Laura M., Macías-Ramírez, Aurora, Ríos, Pilar & Manjón-Cabeza, M. Eugenia, 2023, Deep-Sea asteroids (Echinodermata; Asteroidea) from the Galician Bank (North Atlantic Ocean), Zootaxa 5297 (2), pp. 228-238 : 231-234

Hymenaster giboryi Perrier, 1894 . AphialD: 124131. New record. ( Fig. 3 a-d).

Material examined 7 preserved specimens with register number (included station): 124131 -B79 (B11V05); 124131 - B80 (B11V08); 124131 -B81 (B11V10).

Diagnostic characters. Arms 5 and thin membrane with muscle fibre and fleshy bands and also spiraculaes ( Fig. 3a ). With 6 paxillar spines and 5 spines forming a wreath around the anus ( Fig. 3b ). Two oral spines and 2 suboral ones ( Fig. 3c ). With 2 rows of tubefeet, 2 adambulacral spines ( Fig. 3d ).

Distribution. Atlantic Ocean, west of Ireland, between Azores and Portugal, north east of Newfoundland, Caribbean Sea, Cuba, Jamaica ( Perrier, 1894; Mortensen 1927; Clark & Downey 1992; Mah, 2022; Obis, 2022).

Bathymetric range. 1900 m ( Mortensen 1927)– 4330 m (MNHN-IE-2019-5917 identified by Sibuet). Present study. 1565 – 1720 m.

Remarks. Fifty-two species of Hymenaster Wyville Thomson, 1873 have been described. Five of them are present in the study area: Hymenaster giboryi , Hymenaster . pellucidus Thomson, 1873 , Hymenaster rex Perrier, 1885 , Hymenaster reticulatus Sibuet, 1976 and Hymenaster tenuispinus Sibuet, 1976 . Hymenaster giboryi and H. pellucidus present 2 or 3 adambulacral spines while the rest varies in that number but always present more than two. In addition, they differ in the paxillar spines numbers, H. giboryi has 6 and H. pellucidus range from 2 to 5 ( Clark & Downey, 1992).

Figures

FIG.3. Hymenaster giboryi (124131-B79): a. Abactinal general view. Scale bar: 2.5 mm. b.Anus. Spine’s wreath. Scale bar: 2.5 mm. c. Actinal general view. Adambulacral plates and furrow spines. Scale bar: 2.5 mm. d. Adambulacral spines detail. Scale bar: 2.5 mm. Map. World distribution area of some species of the genus Hymenaster (see legend).