New observations on some poorly known protasterid ophiuroids from the Lower Devonian Hunsrück Slate of Germany

Glass, Alexander

doi:10.1007/bf02988399

Cited by 11 publications

(4 citation statements)

References 21 publications

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“…With respect to ossicle terminology and higher-level classification, we align with Gladwell [ 21 ]. Unless otherwise stated, ossicle terminology follows that of Spencer and Wright [ 22 ], Jell and Theron [ 7 ], Glass [ 23 ] and Gladwell [ 21 ].…”

Section: Methodsmentioning

confidence: 99%

Earliest known ophiuroids from high palaeolatitude, southern Gondwana, recovered from the Pragian to earliest Emsian Baviaanskloof Formation (Table Mountain Group, Cape Supergroup) South Africa

Reddy,

Thuy,

Reid

et al. 2023

PLoS ONE

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For the first time, ophiuroids have been found in South African strata predating the lowermost Bokkeveld Group. These comprise natural moulds and casts from two localities in the ‘upper unit’ of the Baviaanskloof Formation (Table Mountain Group). As a Pragian to earliest Emsian age has been inferred for this member, the new taxa comprise the earliest high-palaeolatitude ophiuroid records from southern Gondwana. Morphological analysis of the specimens revealed the presence of two distinct taxa. One is here described as Krommaster spinosus gen. et sp. nov., a new encrinasterid characterised by very large spines on the dorsal side of the disc, the ventral interradial marginal plates and the arm midlines. The second taxon is a poorly preserved specimen of Hexuraster weitzi, a cheiropterasterid previously described from the slightly younger Bokkeveld Group.

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Section: Methodsmentioning

confidence: 99%

Earliest known ophiuroids from high palaeolatitude, southern Gondwana, recovered from the Pragian to earliest Emsian Baviaanskloof Formation (Table Mountain Group, Cape Supergroup) South Africa

Reddy,

Thuy,

Reid

et al. 2023

PLoS ONE

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“…The rarity of ophiuroids in this environment (Fig. 5; Table 6) could reflect these soft bottoms or the fact that the bottoms did not support their feeding strategy, although soft bottoms in other Paleozoic settings do not seem to have precluded ophiuroids (e.g., Glass and Blake, 2002, 2004; Glass, 2006a, b, c). More likely, however, the rarity of ophiuroids in the basinal setting might reflect taphonomic factors.…”

Section: Discussionmentioning

confidence: 97%

Paleoecology and taxonomy ofSchoenaster carterensis, a new encrinasterid ophiuroid species from the Upper Mississippian (Chesterian) Slade Formation of northeastern Kentucky, USA

2020

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Schoenaster carterensis new species, is an asteroid-like ophiuroid (Echinodermata) from Upper Mississippian (Chesterian) shallow-water carbonates in the Ramey Creek Member of the Slade Formation in northeastern Kentucky. First described in the 1860s from Lower and Middle Mississippian rocks, Schoenaster Meek and Worthen, 1860 is not a well-known fossil genus, but the 39 specimens in this collection permitted further definition of the genus and extended its range by ca. 17 Ma into Late Mississippian (Chesterian) time. The number of specimens also permitted differentiation of growth stages based on average arm length and showed that arm length, disk perimeter, and disk area are interrelated in statistically significant ways. Although replaced by chert, the specimens are nearly intact due to rapid burial as rare constituents in habitat communities distributed among four once-contiguous habitats, including shoal, shoal margin, transitional, and basinal. Most of the ophiuroids were concentrated on firm grounds or hardgrounds in shoal and transitional environments, concentrations that probably reflect substratum stability and the ability to support the ophiuroid's generalist feeding strategy. Many fossil ophiuroid species are known from only a few specimens, severely limiting interpretations about their detailed taxonomy, individual variation, and ecology. In contrast, the greater number of specimens and extensive knowledge of geologic occurrence in this study permitted detailed interpretations regarding the taxonomic, intraspecific, and ecologic attributes of this species, which might be useful in the study of other fossil ophiuroids.UUID: http://www.zoobank.org/ffd945d8-63ac-4c38-a2d3-8647558dbbf0

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“…Continued diversification through the Ludlovian (e.g. as suggested by the Leintwardine, Westmorland and probably also the Australian species‐rich faunas) and into the Lower Devonian (incorporating the Emsian Hunsrück Slate fauna of Germany, the most diverse asterozoan fauna known from the Palaeozoic; Lehmann ; Glass ; Glass & Poschmann ), is probable. Asterozoan morphology and life habits are diverse during the Ludlovian and support exploitation of ecological niches (in agreement with Herringshaw et al .…”

Section: Discussionmentioning

confidence: 99%

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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New observations on some poorly known protasterid ophiuroids from the Lower Devonian Hunsrück Slate of Germany

Cited by 11 publications

References 21 publications

Earliest known ophiuroids from high palaeolatitude, southern Gondwana, recovered from the Pragian to earliest Emsian Baviaanskloof Formation (Table Mountain Group, Cape Supergroup) South Africa

Earliest known ophiuroids from high palaeolatitude, southern Gondwana, recovered from the Pragian to earliest Emsian Baviaanskloof Formation (Table Mountain Group, Cape Supergroup) South Africa

Paleoecology and taxonomy ofSchoenaster carterensis, a new encrinasterid ophiuroid species from the Upper Mississippian (Chesterian) Slade Formation of northeastern Kentucky, USA

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

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