II.—On <i>Lindstromaster</i> and the Classification of the Palæasterids

Greǵory, J. W.

doi:10.1017/s0016756800142384

Cited by 20 publications

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“…Instead, the generic characters were collated from a re‐description of the Leintwardine specimen NHM 40299a/b figured by Salter (1857) as P . primaeva , by Gregory (1899) as P . bonneyi , and by Spencer (1922) as P .…”

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confidence: 98%

“…Remarks The family Lepidasteridae was erected by Gregory (1899) with two genera included: Lepidaster Forbes, 1850, and Etheridgaster Gregory, 1899. Schuchert (1915) emended the family to include two further genera, Helianthaster Römer, 1863 and Lepidasterella Schuchert, 1915, whilst deciding that Etheridgaster was synonymous with Monaster Etheridge, 1892.…”

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confidence: 99%

“…Gregory (1899) described the genus as Palaeasterina [ sic ] rather than Palasterina . He did, however, make a comprehensive generic revision, removing P .…”

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Starfish Diversity in the Wenlock of England

Herringshaw¹,

Thomas

Smith

2007

Palaeontology

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Although their record extends back to the Early Ordovician, the occurrence of fossil starfish (Echinodermata: Asteroidea) is dependent almost exclusively upon horizons of exceptional preservation. Thus, asteroids found in Silurian obrution deposits of the English Midlands and Welsh Borderlands are particularly significant to an understanding of the early diversity of the group. Six species are described here: Hudsonaster? carectum sp. nov. (Hudsonasteridae), from the lower part of the Lower Elton Formation; and, from the Much Wenlock Limestone Formation, the hudsonasterids Doliaster brachyactis gen. et sp. nov. and Siluraster? ketleyi (Spencer, 1916), the lepidasterids Lepidaster grayi Forbes, 1850 and Lepidactis wenlocki Spencer, 1918, and the palasterinid Palasterina orchilocalia sp. nov. Though few in number, they show a diverse range of body morphologies when compared with Ordovician taxa: L. wenlocki had long, slender rays when fully grown whereas D. brachyactis is the first asteroid with the short-rayed body form of extant cushion stars. Most distinctive of all is L. grayi, the earliest multiradiate taxon known, all complete specimens of which have 13 rays. This morphological variety is interpreted as indicating that by the Early Silurian starfish were exploiting a wide range of feeding habits and ecological niches.

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Starfish Diversity in the Wenlock of England

Herringshaw¹,

Thomas

Smith

2007

Palaeontology

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“…16), as indicated by Spencer (1922). Additionally, it can be identified as the sole figured specimen for the genus by Gregory (, text‐figs 1–3, pl. 16, fig.…”

Section: Systematic Palaeontologymentioning

confidence: 97%

Asterozoans from the Ludlow Series (upper Silurian) of Leintwardine, Herefordshire, UK

Gladwell

2018

Papers in Palaeontology

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A diverse, upper Silurian asterozoan fauna of 16 species is described from Leintwardine, Herefordshire. The asterozoans, comprising taxa assigned to the Asteroidea and Ophiuroidea are found within the Lower Leintwardine Formation of lower Ludfordian (upper Ludlow) age, predominantly in rocks interpreted as submarine channel deposits. This paper amplifies and revises Spencer's treatment of the fauna within the broader context of British Palaeozoic Asterozoa in the early twentieth century. Owing to the rarity of asterozoan‐bearing deposits in the Palaeozoic and particularly the Silurian, the Leintwardine fauna is significant for understanding the early diversity of the group, and assessing potential diversification trends. The study is based on extensive museum collections and material collected from the Church Hill starfish beds. New observations are made on previously known taxa: the asteroids Hudsonaster? leintwardensis (Salter) (which is reassigned), Coccaster bulbiferus Spencer, Urasterella cf. ruthveni (Forbes) and Palasterina cf. antiqua, the stenurids Rhopalocoma pyrotechnica Salter, Sturtzaster marstoni (Salter), Sturtzaster colvini (Salter), Bdellacoma vermiformis Salter and Antiquaster magrumi Kesling, and the oegophiurid ophiuroids Lapworthura miltoni (Salter) and Furcaster leptosoma (Salter). The asteroids Doliaster sp. and Palasterina sp. are recognized. New species are the stenurids Bdellacoma fortispina sp. nov. and Antiquaster apertisulcus sp. nov., and the oegophiurid Loriolaster fragilicalceus sp. nov., the latter extending the range of the genus to the Ludlovian. Morphological and taxonomic diversity of this fauna is high, compared to the preceding Silurian (with the stenurids comprising a notably diverse component of the fauna), supporting potential asterozoan diversification during the Wenlockian to Ludlovian.

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“…Family Helianthasteridae Gregory, 18991982 Revised diagnosis: Large, multiarmed asteroids of low body profile; disk small to large, arms straight-sided, tapering to pointed tips. Interbrachial angles tightly rounded but not angular.…”

Section: Systematic Paleontologymentioning

confidence: 99%

Re-evaluation of the Devonian family Helianthasteridae Gregory, 1899 (Asteroidea: Echinodermata)

Blake

2009

Paläontol. Z.

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Because of their taxonomic and morphologic diversity, the asteroids of the Lower Devonian Hunsrück Slate of Germany are important to both an understanding of the history of the class Asteroidea and to the interpretation of community evolution during the Paleozoic. Helianthaster Roemer, 1863, a large multiarmed Hunsrück asteroid, is redescribed. The Helianthasteridae Gregory is restricted to Helianthaster and Arkonaster Kesling, 1982 (Middle Devonian, Canada); Lepidasterella Schuchert is similar to the other two genera but known specimens are of poor quality and as a result the status of the genus is uncertain. Helianthaster is noteworthy in part because its size, multiarmed state, and presence of pedicellariae suggest certain crown-group genera, yet aspects of the arrangement of the ambulacral column are characteristic of the Paleozoic asteroid evolutionary grade. Neither Helianthaster nor other Hunsrück asteroids appear closely linked to the crown group; instead, functional patterns apparently reemerged through time, although identification of specific behavior of ancient asteroids is difficult to impossible.

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II.—On Lindstromaster and the Classification of the Palæasterids

Cited by 20 publications

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Starfish Diversity in the Wenlock of England

Starfish Diversity in the Wenlock of England

Asterozoans from the Ludlow Series (upper Silurian) of Leintwardine, Herefordshire, UK

Re-evaluation of the Devonian family Helianthasteridae Gregory, 1899 (Asteroidea: Echinodermata)

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