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Nucleopygus
Taxonomy
Nucleopygus was named by Agassiz (1840) [Sepkoski's age data: K Nc T Mi Sepkoski's reference number: 577].
It was assigned to Nucleolitidae by Smith (1991); to Cassidulidae by Kier (1962), Kier (1966) and Smith (1995); and to Cassiduloida by Sepkoski (2002).
It was assigned to Nucleolitidae by Smith (1991); to Cassidulidae by Kier (1962), Kier (1966) and Smith (1995); and to Cassiduloida by Sepkoski (2002).
Species
Species lacking formal opinion data
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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.
G. †Nucleopygus Agassiz 1840
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Subg. †Nucleopygus (Jolyclypus) Lambert 1918
†Nucleopygus magnus Smith 1995
†Nucleopygus minor Desor 1842
†Nucleopygus pullatus Smith and Jeffery 2000
†Nucleopygus scrobiculatus Goldufss 1826
†Nucleopygus similis d'Orbigny 1856
†Nucleopygus texanus Clark 1891
Diagnosis
No diagnoses are available