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Species Pachydiscus (Pachydiscus) Kennedy 1986


Diagnosis / Definition:
Kennedy (1986):
Material. The original ofSeunes (1890a, pI. 3 (2), fig. 4), from Fresville; EMP unregistered. Discussion. This slowly expanding juvenile P. (Pachydiscus) with depressed whorl section and numerous low, narrow, alternately long and short ribs differs from all other specimens from the Calcaire a Baculites. Seunes referred it to Ammonites colligatus without hesitation, comparing it to Binkhorst's (1861) pis. 7 and 8a; Binkhorst's figures show several species of pachydiscid, and the present specimen is certainly not conspecific with those mentioned by Seunes. It is left in open nomenclature at this time.
Systematics:

39
 Ordo Ammonoidea
  Subordo Ammonitina
   Superfamilia Desmocerataceae
    Familia Pachydiscidae
     Genus Pachydiscus
      Species Pachydiscus (Pachydiscus) jacquoti
Synonym list:
Kennedy (1986):
1890 Pachydiscus sp. colligatus Binkhorst. - Seunes : p.6 pl. 3 (2), fig. 4
1986 Pachydiscus (Pachydiscus) sp. Kennedy. - Kennedy : p.38 pl. 5, figs. 1 and 2
References:

Seunes,J.. (1890):
Contribution a l'etude des cephalopodes du Cretace Superieur de France. 1. Ammonites du Calcaire ä Baculites du Cotentin. . Mém. Soc. geol. Fr. Paleont. 1, Mém. Vol. 2 p. 1-7

Kennedy,W.J.. (1986):
The ammonite fauna of the Calcaire à Baculites (Upper Maastrichtian) of the Cotentin Peninsula (Manche, France) . Palaeontology Vol. 29(1) p. 25-83
Anonymous: Unedited TaxonConcept data
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