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Pygurostoma geometricum

Echinoidea - Cassiduloida

Taxonomy
Clypeaster geometricus was named by Morton (1833). It is a 3D body fossil. Its type locality is Chesapeake and Delaware Canal (Marshalltown, ANSP), which is in a Campanian marine sandstone in the Marshalltown Formation of Delaware.

It was recombined as Pygurus geometricus by Clark and Twitchell (1915); it was recombined as Pygurostoma geometricum by Cooke (1953).

Synonymy list
YearName and author
1833Clypeaster geometricus Morton
1915Pygurus geometricus Clark and Twitchell p. 72
1953Pygurostoma geometricum Cooke p. 14 figs. Pl 4, figs 15-20

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
—Ambulacraria
phylumEchinodermata
subphylumEleutherozoa
—Echinozoa()
classEchinoidea()
RankNameAuthor
subclassEuechinoideaBronn 1860
superorderAcroechinoidea()
—Carinacea
—Irregularia()
—Microstomata
—Neognathostomata
orderCassiduloida
genusPygurostoma
speciesgeometricum(Morton 1833)

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Pygurostoma geometricum Morton 1833
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Diagnosis
No diagnoses are available