The fossil record of the asteroid (Echinodermata) family Chaetasteridae Sladen 1889 and subfamily Hyalothricinae Fisher, 1911 Author Gale, Andrew S. School of the Environment, Geography and Geological Sciences, University of Portsmouth, Burnaby Building, Burnaby Road, Portsmouth PO 13 QL U. K. & Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW 75 BD U. K. text Zootaxa 2020 2020-09-29 4858 1 144 150 journal article 10.11646/zootaxa.4858.1.11 1175-5326 4411478 93DB37F6-2564-4E3A-AA25-4A842994BE68 Genus Chaetaster Müller & Troschel, 1842 Diagnosis. Delicately constructed 5-rayed asteroids with long, narrow arms, small discs; marginal, abactinal and actinal ossicles of nearly equal size and shape, with raised, flat-topped central region bearing a dense cluster of short, hyaline spines; proximal arm constructed of 13 extraxial plate rows (1 radial, 4 adradial, paired supero- and inferomarginals, 4 actinals), decreasing distally to 5 close to arm tip (1 radial, paired supero- and inferomarginals). Type species. Asterias longipes Bruzelius, 1805 Remarks. Chaetaster includes a small group of living species (Mah, 2020), including, in addition to the type species (eastern central Atlantic), C. nodosus Perrier, 1875 (central western Atlantic, Gulf of Mexico), C. moorei Bell, 1894 (South China Sea), and C. vestitus Koehler, 1910 (Indian Ocean).