Quereilhac P. (2009) La Sous-Famille des Taramelliceratinae (Ammonitina, Haploceratoidea, Oppeliidae) de l'Oxfordien moyen et superieur (Zone a Plicatilis, Sous-Zone a Vertebrale - Zone a Bimammatum, Sous-Zone a Berrense) du Nord de la Vienne, France (Province submediterraneenne) // Carnets de Geologie. Memoir 2. 101 pp.
In the area of northern Poitou studied Taramelliceratinae are present at every level except in the Schilli Subzone, itself possibly absent, and the Stenocycloides Subzone in which only Perisphinctidae and Trimarginites sp. occur. Although some species are known and cited in the literature often, they are figured infrequently or not at all: Taramelliceras (Taramelliceras) dentostriatum (QUENSTEDT), T. (T.) callicerum (OPPEL), T. (Proscaphites) anar (OPPEL). Here, the ranges of these species in the stratigraphic succession were determined through their association with other faunas in the same collections, using the presence or absence of known precise stratigraphic markers (for example: Neomorphoceras chapuisi (OPPEL) = Transversarium Zone, Luciaeformis Subzone; Taramelliceras (? Taramelliceras) colleti (LEE) = Rotoides Subzone; "Epipeltoceras semimammatum" (QUENSTEDT) = Bimammatum Zone, "Berrense" Subzone, Semimammatum horizon) and/or the disappearance of species with longer ranges (for example: the disappearance of Neoprionoceras lautlingensis (ROLLIER) which is present in the Parandieri Subzone, but absent in the overlying Luciaeformis Subzone). The ranges of certain species that had been incorrectly located stratigraphically : T. (T.) dentostriatum (QUENSTEDT), T. (T.) callicerum (OPPEL), T. (T.) externnodosum DORN, have been restored to their true location as determined from their occurrences in the author's collections and in those of other collectors who had noted their stratigraphic relationships to other taxa. It is recommended that the date of creation of the Luciaeformis Subzone and the Nectobrigensis, Luciaeformis and Subschilli horizons (Middle Oxfordian, Transversarium Zone) should be rectified. Currently, these are indicated as having been created in 1984. However, if the author's name, G. MELENDEZ, is correct the date of their creation cannot have been 1984, the year in which the G. MELENDEZ thesis was defended, for the manuscript was published only in 1989. It is also proposed that the Duongi horizon MELENDEZ, 1989, be renamed as the Duongae horizon MELENDEZ, 1989, because the index form, Perisphinctes (Dichotomoceras) duongi MELENDEZ, 1989, is an ammonite species named to honor of A.N. DUONG, a woman. The study involved more than fifteen hundred individuals, all collected in the zone investigated. Only the most representative are figured here. The poor state of preservation of the ammonites (encrusted, often worn on one face, with the umbilicus not accessible) did not permit measurement (hence no table) except that of the diameter and sometimes the thickness. Previous studies of this subfamily or these species (OPPEL, 1863; QUENSTEDT, 1887; LORIOL, 1902; LEE, 1905; DORN, 1931; HÖLDER, 1955) are old. References to this subfamily or its representatives in more recent works are only incidental and rarely include descriptions, drawing or photographs. The existence of many ammonites comprising homogeneous groups but without characteristics in common with known species justifies the creation of new species. Some microconchs have been definitely associated with a macroconch species. For others, a lack of material did not permit the establishment of such a direct link so they have been attached to the supposedly related species with the mention, "aff." (for "affinis"). Nevertheless, although described and figured, these forms remain in open nomenclature. There are some "groups" of ammonites with new characteristics that are here associated with a known species because the differences were not sufficient to create new ones; they are distinguished by "var." (for "variety"). There are also some that are referred to a previously known species because they were based only on a fragment (polymorphism?). In addition, in the zone studied the several taxa of this subfamily permit a relatively detailed stratigraphic breakdown because their existence is limited at a maximum to a subzone. However, an exception is the species Taramelliceras (Proscaphites) anar (OPPEL, 1863) which ranges from the Antecedens Subzone through the Rotoides Subzone. Some new species described in this paper, including some species which were previously described as new by the author (2000). But Philippe ignored his own previously published monograph and did not mentioned it in references.