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Diagnostic Features
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- Large depressed test with rounded ambitus.
- Apical disc size and plating unknown.
- Ambulacra straight; and narrow. Pore-pairs arranged uniserially throughout.
- Plating trigeminate in diadematid style with all three elements reaching the perradius and with the central element largest. Single large ambulacral tubercle to each compound plate.
- Interambulacral plates much wider than tall; with row of three or more subequal tubercles. Tubercles perforate and non-crenulate.
- Secondary granulation sparse.
- Lantern with grooved teeth.
- Spines small and without cortex; hollow.
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Distribution
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Jurassic (Bathonian to Portlandian), Europe. |
| Name gender |
feminine |
| Type |
Hemipedina marchamensis Wright, 1855, by subsequent designation of Lambert, 1900, p. 28. |
| Species Included |
- P. marchamensis (Wright, 1855); Oxfordian, England.
- P. bouchardi (Wright, 1858); Portlandian, France.
- P. legayi (Rigaux, 1885); Bathonian, France.
- P. morrisi (Wright, 1858); Kimmeridgian, England
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| Classification and/or Status |
Pedinoida, Pedinidae.
Monophyletic.
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| Remarks |
Very similar to Diademopsis Desor, 1855, but differing in having a row of three or more subequal tubercles on ambital and subambital plates.
Pomel, A. 1883. Classification méthodique et Genera des Échinides vivante et fossiles. Thèses présentées a la Faculté des Sciences de Paris 503, A. Jourdan, Alger, 131 pp. |
