Contributed by Andrew Smith, August 2011
|Distribution||Middle Jurassic (Bathonian), France.|
|Type||Desorella guerangeri Cotteau, 1862, p. 67, by monotypy.|
|Species Included||Only the type species|
|Classification and/or Status||Irregularia, stem group Echinoneoida?
|Remarks||Differs from Aulacopygus and Hyboclypus in having the anterior and posterior genital plates in contact and displacing ocular plates II and IV outwards. Distinguished from Galeropygus by having a more elongate disc and fewer complementary plates in the disc. Distinguished from Pygopyrina by having complementary plates separating the pairs of genital plates.
Vadet (2000) described a specimen from the Bathonian of France under the name Pyrinodia guerangeri which has an apical disc without complemental plates. As Cotteau\'s species is clearly shown with complemental plates the synonymy of these two specimens is questionable. Until Cotteau\'s type specimen is redescribed and its apical disc plating confirmed it seems prudent to maintain Pyrinodia as discrete from Pygopyrina.
Appears as Pyrenodia in the index of Pomel, 1883 (p. 130).
Pomel, A. 1883. Classification methodique et genera des echinides vivants & fossiles. Thesis presentes a la Faculte des Sciences de Paris. Algar, Jourdan. 131 pp.
Vadet, A. 2000. Les Echinides de la Sarthe: Supplement. Bulletin de la Societe academique du Boulonnais 4(3), 83-92.
Cotteau, G. 1862. Echinides nouveau ou peu connus. Revue et Magazin de Zoologie 14, 185-201, pls 9, 10.