Soft substratecrinoids (Crinoidea: Comatulida) andtheir macrosymbionts in Halong Bay (North Vietnam) Author Es, Mekhova Author Ta, Britayev text Raffles Bulletin of Zoology 2015 2015-10-09 63 438 445 journal article 10.5281/zenodo.5385536 2345-7600 5385536 39EA82B2-4BF4-41AB-9B25-D51A3F0D1EC1 Capillaster gracilicirrus Clark AH, 1912 ( Fig. 2b ) Capillaster gracilicirra Clark AH, 1912 : p. 18 ; Clark AH, 1918 : pp. 10 (in key), 11, 276, pl. 11, fig. 3; Messing, 2015 . Material. South China Sea, Halong Bay , Katba Is. , St. 8, 5 m depth , 6 May 2012 – 1 specimen . Coloration. Dark brown pinnules and light brown arms, becoming fully dark brown in alcohol. Measurement. Thirty eight arms, with length unknown (damaged); 22 cirri 19 mm in length. Taxonomic remarks. Morphology of this specimen is in accordance with the diagnoses of C. gracilicirrus provided by Messing (2015) . Ecological notes. Very rare. Solitary, 5 m depth, on muddy sand close to the base of zoantarian. Probably nocturnal, during the day, fully exposed but with arms folded. Habitat of С. gracilicirrus was previously unknown. Symbionts. Polychaete Hololepidella cf. laingensis . Distribution. Halong Bay, northern Vietnam ; Madura Island, Indonesia ( Messing, 2015 ). First record from the coast of Vietnam .