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

Blake, Daniel B.; Koniecki, Joseph M.

doi:10.1017/jpa.2020.42

Cited by 5 publications

(3 citation statements)

References 61 publications

(184 reference statements)

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“…Although the majority of references systematically describe the anatomy of echinoderm species to infer evolutionary relationships, echinoderm workers routinely describe information on functional morphology (e.g. Guensburg 1988; Guensburg & Sprinkle 1994; Blake & Koniecki 2020), substrate relationships (e.g. Brett 1978; Guensburg 1991; Zamora & Smith 2010), ichnology (e.g.…”

Section: Methodsmentioning

confidence: 99%

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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Section: Methodsmentioning

confidence: 99%

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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“…Los crinoideos y asteroideos recolectados se encuentran depositados en la Colección Nacional de Equinodermos (CNE) del Instituto de Ciencias del Mar y Limnología (ICML), UNAM, México, están preservados en alcohol etílico al 70 % aunque varios asteroideos se encuentran deshidratados en gavetas de la colección seca. Para el arreglo taxonómico del listado se adoptaron los criterios de los siguientes autores, para la clase Crinoidea: Clark y Clark (1967), Meyer et al, (1978), Messing y Dearborn (1990); para la clase Asteroidea: Clark y Downey (1992); Clark (1989), Clark (1993), Clark (1996); Blake (1987), Blake (1989) y Mah y Blake (2012) con algunas corroboraciones en la base datos WoRMS (Messing, 2020;World Register of Marine Species, 2023).…”

Section: Materiales Y Métodosunclassified

Crinoidea y Asteroidea (Echinodermata) del talud de la península de Yucatán, de la Colección Nacional de Equinodermos de México

Durán-González,

Laguarda-Figueras,

Solís-Marín

et al. 2024

Rev. Biol. Trop.

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Introducción: Las especies de las clases Crinoidea y Asteroidea se distribuyen en gran variedad de hábitats en todos los océanos desde la zona intermareal hasta grandes profundidades, existen pocos registros en aguas mexicanas, a profundidades superiores a los 200 m, los escasos registros existentes datan de documentos históricos de la literatura especializada y los ejemplares se resguardan en colecciones científicas extranjeras. Objetivo: Contribuir a la recopilación de información de los ejemplares resguardados en la Colección Nacional de Equinodermos (CNE) del Instituto de Ciencias del Mar y Limnología (ICML), UNAM y proveer un inventario de las especies de crinoideos y asteroideos que habitan en zonas profundas del talud de la Península de Yucatán, México. Métodos: Del año 2005 al 2014 se recolectaron ejemplares de crinoideos y asteriodeos en cuatro cruceros en el B/O “Justo Sierra” BIOREPES 1 y 2 y COBERPES 2 y 6. Se realizaron arrastres con red camaronera en 80 estaciones de muestreo. Resultados: El listado taxonómico comprende 1146 ejemplares, de los cuales 204 son crinoideos del orden Comatulida, distribuidos en tres familias tres géneros y tres especies y 942 asteroideos distribuidos en seis órdenes, 11 familias, 21 géneros y 28 especies. Se obtuvieron los registros nuevos para la CNE: Democrinus rawsonii y Atelecrinus balanoides en crinoideos. Astropecten alligator, Hymenaster modestus, Calyptraster personatus, Pteraster militarioides militarioides, Sclerasterias contorta en asteroideos. Con esta información se incrementan los registros de crinoideos y asteroideos (de profundidad mayor a 200 m) para los estados de Yucatán (16) y Quintana Roo (16).

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“…is available, it is emphasized that the largest physical size attained by this species cannot be established with finality. Significant ontogenetic change within Paleozoic asteroids based on a large specimen suite has been described (Blake and Koniecki, 2020), but perhaps most striking of known changes accompanying growth are those of extant Culcita Agassiz, 1836. Clark (1946, p. 108) pointed out that small individuals of Culcita differ so significantly from the large that “they have been described under three other generic names.” For A .…”

Section: Systematic Paleontologymentioning

confidence: 99%

Arceoaster hintei n. gen. n. sp., a late Silurian homeomorphic asteroid (Echinodermata, Hudsonasteridae)

Blake

Sprinkle

2020

J. Paleontol.

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The late Silurian Arceoaster hintei new genus new species (Asteroidea, Echinodermata) is based on a single complete specimen from the lower Hunton Group of southern Oklahoma. Overall ossicular arrangement enables assignment of the new genus to the Paleozoic stem-family Hudsonasteridae; however, Arceoaster n. gen. is homeomorphic with members of the post-Paleozoic crown-group Goniasteridae. Because Arceoaster n. gen. is a hudsonasterid, and because similar morphologic expressions are not known among described taxa from later in the Paleozoic or the early Mesozoic, similarities between Arceoaster n. gen. and later genera are homoplastic, thereby providing an example of iterative evolution within Asteroidea. The Arceoaster n. gen. specimen is associated with a rich and diverse invertebrate fauna typical of its time interval and environmental setting; nothing suggests an unusual habitat. Selective pressures leading to homoplasy are conjectural, although robust construction among extant asteroids has been associated with a defensive life strategy. UUID: http://zoobank.org/b1d8461d-7e54-43cc-8719-97304ca3fd7a

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

Cited by 5 publications

References 61 publications

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

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

Crinoidea y Asteroidea (Echinodermata) del talud de la península de Yucatán, de la Colección Nacional de Equinodermos de México

Arceoaster hintei n. gen. n. sp., a late Silurian homeomorphic asteroid (Echinodermata, Hudsonasteridae)

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