Asteriidae

Belongs within: Forcipulatida.Contains: Leptasterias, Asterias. The Asteriidae are a family of starfish with a swollen body and both straight and crossed pedicellariae. Of the three subfamilies listed below, the Pycnopodiinae have the aboral skeleton obsolescent whereas Neomorphaster has the primary aboral plates conspicuously enlarged. Pycnopodiinae have inferomarginals with two spines, heavily wreathed with pedicellariae, and… Continue reading Asteriidae

Published
Categorised as Asterozoa

Asterias

Belongs within: Asteriidae. Asterias is a cosmopolitan genus of sea stars with a large disc and relatively broad arms. Characters (from Spencer & Wright 1966): Disc fairly large, arms 5 or 6, rather broad and short; aboral skeleton an open network with spines in nearly regular series along midline and margin of arms but elsewhere… Continue reading Asterias

Published
Categorised as Asterozoa

Ophiacanthidae

Belongs within: Ophiurida.Contains: Ophiacantha. The Ophiacanthidae are a group of brittle stars with slender arms bearing numerous long, often glassy spines (Spencer & Wright 1966). Rise to the surface, retreat to the depths Published 7 December 2022 Despite being the most speciose of the recognized modern classes of echinoderms, the brittle stars (Ophiuroidea) are perhaps… Continue reading Ophiacanthidae

Ambuloasteroidea

Belongs within: Asteroidea.Contains: Forcipulatida, Valvatacea, Spinulosacea. The Neoasteroidea represents the starfish crown group, including all living starfish and all known Asteroidea from the Mesozoic and Cenozoic eras (Blake & Hagdorn 2003). <==Ambuloasteroidea |–CalliasterellidaeBH03 | |–Protarthraster Spencer 1918 [Protarthrasterinae]SW66 | | `–*P. longimanus (Whidborne 1896) [=Palaeaster longimanus]SW66 | `–CalliasterellinaeBH03 | | i. s.: ‘Calyptactis’ confragosus Miller… Continue reading Ambuloasteroidea

Published
Categorised as Asterozoa

Goniasteroidea

Belongs within: Valvatacea.Contains: Stauranderasteridae, Goniasterinae, Anthenoidinae, Hippasteriinae. The Goniasteroidea are a group of starfish with flat, plate-like abactinals (Blake 1987). Characters (from Blake 1987, as Goniasteracea): Body shape usually more or less flattened with discs large, interbrachial arcs rounded; some species subspherical; multi-armed species lacking; most species moderate to large in size but some small.… Continue reading Goniasteroidea

Paxillosida

Belongs within: Valvatacea.Contains: Astropectininae. The Paxillosida are a group of starfish associated with sandy or muddy habitats. They mostly lack a number of features found in other starfish, such as an anus, extra-oral feeding, suckered tube feet, or a brachiolaria larval stage (Matsubara et al. 2005). <==Paxillosida [Paxillosa] |–Astropectinidae [Diplozonina, Plutonasteridae, Primasterinae]BTH00 | | i.… Continue reading Paxillosida

Published
Categorised as Asterozoa

Ophiodermatidae

Belongs within: Ophiurida.Contains: Ophiocomidae. The Ophiodermatidae are a group of brittle stars with the relatively stout arms inserted laterally and firmly fused with the disc (Spencer & Wright 1966). Characters (from Spencer & Wright 1966): Arms inserted laterally and firmly fused with disc, moderately long, stout, widest at base. Granules cover disc scales of both… Continue reading Ophiodermatidae

Published
Categorised as Asterozoa

Gnathophiuridea

Belongs within: Ophiurida.Contains: Ophiotrichidae, Ophiactis, Amphiura. The Ophiactidae are a family of brittle stars in which the disc bears a covering of granules or spinules. Brittle stars, brittle taxa Published 9 April 2017 The brittle stars are something of the poor cousin among echinoderm classes. Their tendency to relatively small size and cryptic habitats means… Continue reading Gnathophiuridea

Ophiotrichidae

Belongs within: Gnathophiuridea. The Ophiotrichidae are a family of stout-toothed brittle stars. Characters (from Spencer & Wright 1966): Teeth stout, quadrangular, spiniform tooth papillae clustered at apex of each jaw. No oral papillae. <==Ophiotrichidae |–Ophiomaza Lyman 1871 [incl. Luetkenia Brock 1888 nec Claus 1864 nec Duncan 1878]SW66 | `–*O. cacaotica Lyman 1871SW66 |–Ophiopteron Ludwig 1888SW66… Continue reading Ophiotrichidae

Published
Categorised as Asterozoa

Amphiura

Belongs within: Gnathophiuridea. Amphiura is a cosmopolitan genus of brittle stars with the central disc covered by fine scales. Characters (from Spencer & Wright 1966): Oral papillae not forming continuous row along jaw, having single infradental separated by gap from single outer papilla with internal one invisible above gap. Disc with fine, flat, imbricating scales.… Continue reading Amphiura

Published
Categorised as Asterozoa