New Early Paleozoic Asterozoa (Echinodermata) from the Armorican Massif, France, and the Western United States

Blake, Daniel B.; Guensburg, Thomas E.; Lefèbvre, Bertrand

doi:10.1016/j.annpal.2016.08.002

Cited by 7 publications

(13 citation statements)

References 42 publications

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“…The Herefordshire specimen shares a number of characters with Protasteridae, most recently diagnosed by Dean Shackleton (2005; see Blake et al . 2016), including an obvious interradial disc without marginalia, elongate gradually tapering arms, and alternating ambulacra with a slightly zig‐zag perradial suture (Spencer 1934; Dean Shackleton 2005). The apparently light nature of the plating may be taphonomic.…”

Section: Discussionmentioning

confidence: 99%

A Silurian ophiuroid with soft‐tissue preservation

Carter

Sutton

Briggs

et al. 2021

Papers in Palaeontology

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Most Palaeozoic brittle stars lack the fused arm ossicles (vertebrae) that facilitate the remarkable mode of walking that characterizes living forms. Here we describe a stem ophiuroid from the Herefordshire Lagerst€ atte (Silurian, Wenlock Series), which is exceptional in preserving the body cavity uncompacted and the long tube feet. We assign the specimen to the order Oegophiurida. The morphology of the arms and attitude of the specimen suggest that locomotion may have been achieved by arm propulsion combined with podial walking. This ophiuroid increases the diversity of echinoderm higher taxa with preserved soft parts represented in the Herefordshire Lagerst€ atte.

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Section: Discussionmentioning

confidence: 99%

A Silurian ophiuroid with soft‐tissue preservation

Carter

Sutton

Briggs

et al. 2021

Papers in Palaeontology

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“…(1, 2) Scale bars = 20.0 mm; (3-5, 9-11) scale bars = 5.0 mm; (6, 8) scale bars = 2.0 mm; (7) scale bar = 10.0 mm. reevaluation were included in Blake, Guensburg, and Lefebvre (2016) and Blake (2017Blake ( , 2018.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…Schuchert (1915) provided extended review and discussion of urasterellid concepts; these were further reviewed and expanded by Spencer (1918). Spencer and Wright (1966) provided familial and generic summary, Shackleton (2005) reviewed status of Ordovician exemplars, and new urasterellid taxa with some reevaluation were included in Blake, Guensburg, and Lefebvre (2016) and Blake (2017, 2018).…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…Diagnoses of Urasterella , Salteraster , and Ulrichaster herein begin with emphases of Schuchert (1915), Spencer (1918, 1950), and Spencer and Wright (1966). Meturaster was recognized by Blake et al (2016), and the Carboniferous genera Staurasterias and Anthroosasterias were described by Blake (2017). The availability of a new suite of fossils encompassing a broad size range herein enables assignment of Urasterella huxleyi (Billings, 1865) to Anthroosasterias .…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…( 1 ) Staurasterias elegans Blake, 2017, USNM 92676, Mississippian, Indiana, overall view of remainder of specimen; madreporite enlarged, circular. ( 2 ) Meturaster belli Blake et al, 2016; USNM 629326, Ordovician, Nevada, overall view of remainder of specimen; largest double series of distal ossicles are axials. ( 3, 4 ) Salteraster grandis ; PRIP 20026, Ordovician, Oklahoma, small individual similar to small individuals of other urasterellid genera.…”

Section: Introductionmentioning

confidence: 99%

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Taxonomy and functional morphology of the Urasterellidae (Paleozoic Asteroidea, Echinodermata)

Blake

Koniecki²

2020

J. Paleontol.

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Abstract Family-level taxonomic concepts for Paleozoic Asteroidea are problematic; data availability for the family Urasterellidae, however, is judged sufficient for familial reappraisal. The survey cannot be fully comprehensive because certain available names are founded on very limited material, with specimens widely scattered among collections. Recognized urasterellid genera include Urasterella Schuchert, 1914; Anthroosasterias Blake, 2017; Meturaster Blake, Guensburg, and Lefebvre, 2016; Salteraster Stürtz, 1893; Staurasterias Blake, 2017; Ulrichaster Spencer, 1950; and Pegoasterella pompom n. gen. n. sp. Other available generic names are held in abeyance. The name Urasterella has approached form-genus status, an outcome exacerbated by incomplete understanding of the type species. Urasterella huxleyi (Billings, 1865) is reassigned to Anthroosasterias. Relatively large specimen suites for Anthroosasterias huxleyi (Billings, 1865) and Salteraster grandis (Meek, 1872) enable some interpretation of urasterellid intrataxon variation, ontogenetic change, and life mode. Morphologic changes accompanying ontogeny of A. huxleyi are argued as favoring a shift from substrate surface feeding to feeding through extension of arms into the water column in a manner comparable to that seen among extant Forcipulatida and ophiurans. UUID: http://zoobank.org/82d2eca7-55e0-42ed-a164-c666652e3972

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Ecological novelty at the start of the Cambrian and Ordovician radiations of echinoderms

Novack‐Gottshall,

Purcell,

Sultan

et al. 2024

Palaeontology

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The Cambrian and Ordovician radiations marked the origins of all major echinoderm clades and established their Phanerozoic ecological blueprint. Recent claims of modest innovation of early echinoderms and other animals suggest constraints on novelty during the origins of phyla. Here, we document the life‐habit richness, body size, tiering, habitat usage, mobility, diet and foraging habits of 366 Cambrian–Ordovician echinoderm genera across a time‐scaled phylogeny to identify the timing and impact of novelty. Most early echinoderms were sedentary, filter‐feeding microbivores, and their body sizes, diets and modes of locomotion were largely unchanged through time, despite major volatility in taxonomic composition. Cambrian echinoderms lived close to the seafloor, with stylophorans first evolving semi‐infaunality. Many Ordovician echinoderms lived farther from the seafloor, with more complex filter‐feeding organs and tiering structure, often using other organisms as substrates. Mobile carnivores and mass‐feeders emerge then, too, across diverse asterozoans and echinozoans. Most of these novelties coincide with the origins of individual clades during the early and late Cambrian (Terreneuvian/Series 2 and Furongian), and 10–20 million years pass before most become ecologically important. Life‐habit evolution within most taxa involved new variations in these traits, with crinoids and asterozoans better able to shift strategies. The Ordovician radiation records more new variability in pre‐existing Cambrian life habits rather than radical re‐invention, with important novelties (like mobile carnivory and mass‐feeding, increased height off the seafloor, and biotic substrates) becoming ecologically more impactful. Taxa with these strategies were those best able to capitalize on the newly heterogeneous Ordovician world.

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New Early Paleozoic Asterozoa (Echinodermata) from the Armorican Massif, France, and the Western United States

Cited by 7 publications

References 42 publications

A Silurian ophiuroid with soft‐tissue preservation

A Silurian ophiuroid with soft‐tissue preservation

Taxonomy and functional morphology of the Urasterellidae (Paleozoic Asteroidea, Echinodermata)

Ecological novelty at the start of the Cambrian and Ordovician radiations of echinoderms

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