Cassiduloida

Cassiduloida
Temporal range: Lower Jurassic–Holocene
Scientific classification
Kingdom:
Animalia
Phylum:
Echinodermata
Class:
Echinoidea
Superorder:
Neognathostomata
Order:
Cassiduloida

L. Agassiz & Desor, 1847
Families

Echinolampadidae
Neolampadidae

Cassiduloida is an order of sea urchins. The group was extremely diverse with many families and species during the Mesozoic, but today, only seven extant species remain.[1]

A 2019 phylogenetic systematics study by Souto et al. presented a revised classification of the cassiduloids, and hypothesised that the order probably originated in the Early Cretaceous.[1]

Description and characteristics

Cassiduloids have a rounded or slightly oval appearance, and look somewhat similar to heart urchins, although they are actually more closely related to the sand dollars. They are distinguished from other sea urchins by the presence of smaller intervening areas between the main ambulacral areas on the oral surface. They have no lantern as adults, and the petaloids are poorly developed or absent.

List of families and genera

References

  1. ^ a b c Camilla Souto; Rich Mooi; Luciana Martins; Carla Menegola; Charles R. Marshall (2019). "Homoplasy and extinction: the phylogeny of cassidulid echinoids (Echinodermata)". Zoological Journal of the Linnean Society. 2019 (3): 622–660. doi:10.1093/zoolinnean/zlz060.
  2. ^ Jesionek-Szymanska, W. (1978). "On a new galeropygid genus (Echinoidea) from the Jurassic (Upper Lias) of Morocco - Acta Palaeontologica Polonica". www.app.pan.pl. Retrieved 2024-11-22.


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