Brahmaites (Brahmaites) brahma Forbes 1846 (TaxonConcept

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Species Brahmaites (Brahmaites) brahma Forbes 1846

Alternative name:

Brahmaites brahma Forbes 1846

Diagnosis / Definition:

Ward & Kennedy (1993):
Description.- Largest Biscay specimen 43 mm diameter. Coiling very involute, with U = 49 percent of diameter, of moderate depth, umbilical wall slopes outwards, flanks and venter broadly rounded, but original whorl section cannot be established. Very distant straight prorsiradiate constrictions, ?three per half whorl, associated with narrow collar ribs that efface on outer flank and bear umbilical bullae of variable strength. Estimated five primary ribs between constrictions, weak on umbilical wall but strengthening into small umbilical bullae, straight on inner flank, declining and effacing on outer flank. Venter smooth, but for constrictions.

Discussion / Comments:

Ward & Kennedy (1993):
Types- Lectotype is BMNH C5 1029, designated by Kennedy, 1986a, p. 29, and the original of Forbes, 1846, Pl. 8, fig. 1a, b. Paralectotype BMNH C5 1030 is the original of Forbes, 1846, Pl.8, fig. 1c; unfigured paralectotypes are BMNH C5 103 1-5 1037, all from the Valudavur Formation of Pondicherry, south India. Discussion. - Although poor, the Biscay material matches well with the beautifully preserved type material, examples of which are illustrated for comparison in Figure 26.2-26.5. Brahmaites kossmati Henderson and McNamara, 1985 (p. 68, Pl. 6, figs. 11-14, Pl. 7, fig. 1, text-figs. 9a, b, 10) is more evolute and depressed than B. brahma, with more numerous and coarser ribs. See Kennedy (1986a, p. 30) for further discussion of the species. Occurrence. - The Biscay examples come from near the middle of Member I to the top of Member V (Hendaye). The species is rare. It also occurs in the Maastrichtian of Pondicherry, south India, the Silex de Mussidan at Mussidan, Dordogne, France, and allied forms occur in the Maastrichtian of Madagascar.

Systematics:

38
Ordo Ammonoidea
  Subordo Ammonitina
   Superfamilia Desmocerataceae
    Familia Kossmaticeratidae
     Subfamilia Kossmaticeratinae
      Genus Brahmaites
       Species Brahmaites (Brahmaites) brahma

Synonym list:

Ward & Kennedy (1993):

1846 Ammonites Brahma Forbes. - Forbes : p.100 pl. 8; fig. 1

1986 Brahmaites brahma Forbes. - Kennedy : p.29 text-fig. 10a-k (with full synonymy)

1993 Brahmaites (Brahmaites) brahma Forbes. - Ward & Kennedy : p. 25 ,28 fig. 23.4, 26.2-26.5

Stratigraphy - relative ages:

lower Maastrichtian - lower Maastrichtian: Ward & Kennedy (1993)

References:

Forbes,E.. (1846):
Report on the Cretaceous fossil invertebrates from southern India, collected by Mr. Kaye and Mr. Cunliffe . Transactions of the Geological Society of London Vol. 2(7) p. 97–174

Kennedy,W.J.. (1986):
Campanian and Maastrichtian ammonites from northern Aquitaine, France . Palaeontological Association of London Special Papers in Palaeontology Vol. 36 p. 145

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

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