The Echinoid Directory

Laevipatagus Noetling, 1885, p. 211 (481)

Diagnostic Features
  • Test ovate with shallow but distinct anterior sulcus; posterior face truncate. Test with flat base and low domal profile.
  • Apical disc subcentral; plating unknown.
  • Frontal ambulacrum weakly sunken from apex; pore-pairs small and undifferentiated.
  • Paired ambulacra petaloid; bowed; hardly depressed; closed distally.
  • Peristome subcentral in a distinct depression; kidney-shaped. Anterior interambulacra forming prominent transverse nodes close to mouth.
  • Plastron with elongate labral plate extending to second ambulacral plate. Sternal plates short and triangular, fully tuberculate. Episternal plates paired and indented to rear by ambulacra.
  • Periproct high on posterior truncate face; small and taller than wide.
  • Subanal fasciole present; bilobed. No other fascioles recorded.
  • Aboral tuberculation apparently uniform and fine.
  • Test ovate with shallow but distinct anterior sulcus; posterior face truncate. Test with flat base and low domal profile.
  • Apical disc subcentral; plating unknown.
  • Frontal ambulacrum weakly sunken from apex; pore-pairs small and undifferentiated.
  • Paired ambulacra petaloid; bowed; hardly depressed; closed distally.
  • Peristome subcentral in a distinct depression; kidney-shaped. Anterior interambulacra forming prominent transverse nodes close to mouth.
  • Plastron with elongate labral plate extending to second ambulacral plate. Sternal plates short and triangular, fully tuberculate. Episternal plates paired and indented to rear by ambulacra.
  • Periproct high on posterior truncate face; small and taller than wide.
  • Subanal fasciole present; bilobed. No other fascioles recorded.
  • Aboral tuberculation apparently uniform and fine.
Distribution Upper Eocene, Germany.
Name gender masculine
Type
Spatangus (Micraster) bigibbus von Beyrich, 1848, p. 100, by original designation.
Species Included Only the type species.
Classification and/or Status

Spatangoida, Micrasterina, ?Loveniidae.

Monotypic.

Remarks Differs from Hemipatagus in lacking primary aboral tubercles and by its very distinctive oral transverse mounds in front of the peristome.

Noetling, F. 1884. Zeitschrift der deutsches Geoligische Geschichte 35, p. 688.

Noetling, F. 1885. Die Fauna des Samländischen Tertiärs. Abhandlungen zur Geologischen Specialkarte von Preussen und den Thuringischen Staaten, 6 (3), 1-216, pls 1, 2.