Scutellidae

Scutellidae; Temporal range: Oligocene–Quaternary PreꞒ Ꞓ O S D C P T J K Pg N [1]
	Fossils of Scutella paulensis from France, on display at Galerie de paléontologie et d'anatomie comparée in Paris
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Subclass:	Euechinoidea
Order:	Clypeasteroida
Superfamily:	Scutellidea
Family:	Scutellidae; Gray, 1825[2]

Scutellidae is a family of fossil sand dollars (flat sea urchins) in the superfamily Scutellidea. All genera except Scaphechinus are extinct.

Genera

As of 2017, the World Register of Marine Species recognizes the following seven genera in this family:[3]

†Allaster Nisiyama, 1968
†Parascutella Durham, 1953
†Remondella Durham, 1955
†Samlandaster Lambert, in Lambert & Thiéry, 1914
Scaphechinus A. Agassiz, 1864
†Scutella Lamarck, 1816
†Scutulum Tournouër, 1869

Scaphechinus mirabilis (Suma Aqualife Park, Kobe, Japan)
Scutella paulensis (MNHN)
Scutella subrotunda (MNHN)

gollark: So unless people get able to measure those things more directly, it's entirely possible that requirements will just creep up.

gollark: Anyway, as increasing amounts of people have been going to university, and it requires some basic level of competence at a subject, ability to follow instructions, learning, that sort of thing, *not* going to university serves as an increasingly strong signal that you *don't have* that competence/ability to follow instructions/etc.

gollark: God died in 1996.

gollark: I don't know if the models are any good, but I don't think the one they think is closest predicts complete societal collapse by 2040 anyway?

gollark: Regarding the predictiony thing, if I remember right then it is not "MIT" but some random person building off models from some MIT person years ago.

References

The Paleobiology Database
Gray, J. E. (1825). "An Attempt to divide the Echinida or Sea Eggs, into Natural Families". Annals of Philosophy. New Series. 10 (6): 427–428.
Kroh, A. (2012). Kroh A, Mooi R (eds.). "Scutellidae Gray, 1825". World Echinoidea Database. World Register of Marine Species. Retrieved 6 September 2017.

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[fa-1] The Paleobiology Database

[Gray,_1825-2] Gray, J. E. (1825). "An Attempt to divide the Echinida or Sea Eggs, into Natural Families". Annals of Philosophy. New Series. 10 (6): 427–428.

[WoRMS-3] Kroh, A. (2012). Kroh A, Mooi R (eds.). "Scutellidae Gray, 1825". World Echinoidea Database. World Register of Marine Species. Retrieved 6 September 2017.