Pachydiscus (Pachydiscus) jacquoti jacquoti Seunes 1890 (TaxonConcept

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Subspecies Pachydiscus (Pachydiscus) jacquoti jacquoti Seunes 1890

Alternative name:

Pachydiscus jacquoti jacquoti Seunes 1890

Diagnosis / Definition:

Cobban & Kennedy (1995):
DESCRIPTION.- USNM 463 108, a phosphatic fragment, has whorl breadth to height ratio of 0.97, reniform whorl section, and broadly rounded flanks and venter. Ornament restricted to distant straight, prorsiradiate ventrolateral and ventral ribs that efface over midventral region. Narrow siphuncular groove present. Suture imperfectly preserved, complex and typical for genus.

Discussion / Comments:

Cobban & Kennedy (1995):
TYPES.- Seunes (1890, plate 3, figures 1-3) figured three specimens and mentioned others, from the Cotentin Peninsula, Manche, France; Pyrknkes-Atlantiques, and northwest of Alcoy, Spain. The original of his plate 3, figure 1 should be designated the lectotype when found (see discussion in Kennedy, 1986b, page 36). MATERIAL.- A single specimen, USNM 463 108. DISCUSSION.- This fragment, with its distinctive whorl section and distant ribs, differs in no significant respects from the juvenile syntypes figured by Seunes (1890) and from topotypes from the Calcaire B Baculites of the Cotentin Peninsula figured by Kennedy (1986b). OCCURRENCE.- Prairie Bluff Chalk at locality 24. Elsewhere the species is restricted to the upper Maastrichtian, with records from the Biscay region of France and Spain; Cotentin Peninsula, Manche, France; Kunrade, The Netherlands; Armenia; and Madagascar. Pachydiscus (P.)jacquoti australis Henderson and McNamara (1 985, p. 76, plate 8, figures 1, 2, 7-10, text-figures 12a, 13b, 15a) is known from Western Australia, and the subspecies chilensis Stinnesbeck (1986, page 2 18, plate 13, figure 8, plate 15, figures 1, 3, text-figure 28a) is known from Quiriquina Island, Chile.

Systematics:

46
Ordo Ammonoidea
  Subordo Lytoceratina
   Superfamilia Tetragonitaceae
    Familia Pachydiscidae
     Genus Pachydiscus
      Subgenus Pachydiscus
       Subspecies Pachydiscus (Pachydiscus) jacquoti jacquoti

Synonym list:

Cobban & Kennedy (1995):

1890 Pachydiscus jacquoti Seunes. - Seunes : p.5 pl. 3; fig. 1-3

1960 Pachydiscus llarenai Wiedmann. - Wiedmann : p.764 pl. 4, fig. 6; pl. 5, fig. 4

1964 Pachydiscus llarenai Wiedmann. - Wiedmann : p.147 fig. 39

1986 Pachydiscus (Pachydiscus) jacquoti Seunes. - Kennedy : p.34 pl. 5, fig. 3-11, 15-19; pl. 6; text-fig. 2d, c, 3o, s, 4b [with full synoymy]

1986 Pachydiscus (Pachydiscus) jacquoti Seunes. - Kennedy : fig. 9a, b

1986 Pachydiscus (Pachydiscus) jacquoti Seunes. - Kennedy : p.171 pl. 11, fig. 1-4; pl. 12, fig. 1-3, 8-10; pl. 13, fig. 1-5; pl. 14, fig. 4-6, 8-10; pl. 15, fig. 1-3, 12, 13; text-fig. 7b

1993 Pachydiscus (Pachydiscus) jacquoti Seunes. - Ward & Kennedy : p.31 fig. 25.8, 25.13, 29.1-29.4, 30.1-30.3, 31.2, 31.3, 31.6, 35.7, 39.4, 40.2

1995 Pachydiscus (Pachydiscus) jacquoti jacquoti Seunes. - Cobban & Kennedy : p.24 fig. 16.18, 16.19

Stratigraphy - relative ages:

upper Maastrichtian: Cobban & Kennedy (1995)

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

Wiedmann,J.. (1960):
Le Crétacé supérieur de l'Espagne et du Portugal et ses céphalopodes . C. R. du Congrés des Sociétés Savantes-Dijon, 1959; Colloque sur le Crétacé supérieur francais p. 709-764

Wiedmann,J.. (1964):
Le Crétacé supérieur de l'Espagne et du Portugal et ses céphalopodes . Estudios Geologicos Instituto Lucas Mallada Vol. 20 p. 107-148

Kennedy,J.W.. (1986):
The Campanian-Maastrichtian ammonite sequence in the environs of Maastricht (Limburg, the Netherlands) . Newsletters on Stratigraphy Vol. 16 p. 149-168

Kennedy,W.J.. (1986):
The ammonite fauna of the type Maastrichtian with a revision of Ammonites colligatus Binkhorst, 1861. . Bulletin de I 'Institut Royal des Seiences Naturelles de Belgique, Seiences de la Terre Vol. 56 p. 151-267

Ward,P.D.. and Kennedy,W.J.. (1993):
Maastrichtian Ammonites from the Biscay Region (France, Spain) . Memoir (The Paleontological Society), Journal of Paleontology34 (Supplement to Vol. 67)(5) p. 1-58

Cobban,W.A.. and Kennedy,W.J.. (1995):
Maastrichtian ammonites chiefly from the Prairie Bluff Chalk in Alabama and Mississippi . Journal of Paleontology Vol. 69(5) p. 1-40

Anonymous: Unedited TaxonConcept data

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