Oligopygidae

Duncan, 1889, p.74

Genre type : Oligopygus de Loriol, 1888

Description succinte de la famille : système apical monobasal, quatre gonopores. Périprocte oral à marginal. Tubercules crénelés et perforés.

 

 


 

Genre   Oligopygus de Loriol, 1887

Notes pour servir à l'étude des échinodermes, 1ère série, fascicule II, p.70

Espèce type  Oligopygus wetherbyi de Loriol, 1887, par désignation originale.

Notes pour servir à l'étude des échinodermes, 1ère série, fascicule II, p.72.

Extension stratigraphique (bibliographique, non vérifiée) : Eocène moyen et supérieur

 

 
 

Oligopygus haldemani (Conrad, 1850)

 
 

Oligopygus haldemani (Conrad, 1850) - Eocène, Ocala limestone, Marion Cty, Floride, 27 mm

 
   
 

Oligopygus putnami Israelski,1933

 
diagnose originale de l'espèce par Israelsky, 1933
A new species of Echinoid from Tamaulipas, Mexico, p.275

Oligopygus putnarni, Israelsky, new species

Plate 18, figures 1, 2, 3, 4

     Test tumid, thick walled; outline from above ovoid; ambitus rounded; madreporic system posterior to the center; petals reach about one-half the distance to the ambitus, tending to close distally, interpo­riferous areas strongly raised; greatest width of petals about one-third length; anterior unpaired petal slightly longer than paired petals, paired petals subequal; viewed from the side the outline is strongly arched above, higher anteriorly than posteriorly, and concave below; the peristome lies in a deep transversely elongate groove slightly behind the center; periproct about two-thirds the distance from peristomal groove to ambitus; surface apparently ornamented with stnall scrobiculate tubercles.

     Syntypes: Nos. 5210, 5211, Mus. Calif. Acad. Sci., collected by Lawrence G. Putnam., 12 kilometers northeast of Abasola, Tamaulipas, Mexico; upper Eocene. Topotypes: 5214 and 5215, C. A. S. type collection. Plasto-Syntypes: Nos. 422, 423, San Diego Society of Natural History type collection. Idiotypes: 424, 425, S. D. S. N. H. type collection.  

   
 

     The new species appears to be more closely related to Oligopygus haldermani (Conrad) 1 than to any other thus far described. It may be readily distinguished from that foret by its more anterior periproct. The posterior position of the madreporic system appears to separate it from other species of the genus.

     The species may be the one found by Wise and Cavins in this same district, but not named by them.

planche 18 (extrait)

   

 

 

Oligopygus putnami Israelski,1933 - Eocène supérieur, chiapas, Mexique, 31 mm

 
 

Oligopygus putnami Israelski,1933 - Eocène supérieur, chiapas, Mexique, 26 mm