Basic info Taxonomic history Classification Relationships
Morphology Ecology and taphonomy   Age range and collections

Petropegia

Holothuroidea - Dendrochirotida - Calclamnidae

Taxonomy
Petropegia was named by Summerson and Campbell (1958) [Sepkoski's age data: C Mosc-l]. It is not extant. It is considered to be a form taxon. Its type is Petropegia radiata.

It was assigned to Calclamnidae by Summerson and Campbell (1958), Deflandre-Rigaud (1962) and Frizzell and Exline (1966); and to Dendrochirotida by Sepkoski (2002).

Synonymy list
YearName and author
1958Petropegia Summerson and Campbell p. 965
1962Petropegia Deflandre-Rigaud p. 61
1966Petropegia Frizzell and Exline p. U664
2002Petropegia Sepkoski, Jr.

Is something missing? Join the Paleobiology Database and enter the data

RankNameAuthor
kingdomAnimalia()
Triploblastica
Nephrozoa
Deuterostomia
Ambulacraria
RankNameAuthor
phylumEchinodermata
classHolothuroidea()
orderDendrochirotida
familyCalclamnidae
genusPetropegia

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.

Diagnosis
ReferenceDiagnosis
C. H. Summerson and L. J. Campbell 1958Sclerites in form of large, flat perforate plates of varied outline and characterized by a spinose border. In some forms the spines are developed only peripherally; in others, they are recognizable as thickened or raised walls for some distance in toward the center of the plate. The general appearance is of a plate strengthened by radial supports. Perforations vary in size and arrangement; margins between the spines may be smooth or irregular; maximum known length of spines beyond margins, 0.25 mm.