Cretaceous faunas from Zululand and Natal, South Africa. The ammonite subfamily Mantelliceratinae Hyatt, 1903

Abstract

The Lower Cenomanian part of the Mzinene Formation of northern KwaZulu-Natal has yielded a diverse assemblage of representatives of the cosmopolitan ammonite subfamily Mantelliceratinae Hyatt, 1903. The following species are recognized: Mantelliceras mantelli (J. Sowerby, 1814), M. cantianum Spath, 1926a, M. picteti Hyatt, 1903, M. couloni (d'Orbigny, 1850, M. saxbii (Sharpe, 1857), M. dixoni Spath, 1926b, M. lateretuberculatum Collignon, 1964, M. nitidum (Crick, 1907, Utaturiceras vicinale (Stoliczka, 1864), Submantelliceras prenodosoides (Boule, Lemoine & Thévenin, 1907), Sharpeiceras laticlavium (Sharpe, 1855), S. falloti (Collignon, 1931), S. mocambiquense (Choffat, 1903), S. minor sp. nov., S. florencae Spath, 1925, Sharpeiceras sp. A, and Sharpeiceras sp. B. Submantelliceras Spath, 1923, variously regarded as a synonym of Mantelliceras and other genera by previous authors, is shown to be a valid genus, and a paedomorphic dwarf. Keywords:Cretaceous, ammonite, Cenomanian, Mantelliceratinae, KwaZulu-Natal, South Africa. INTRODUCTIONThe ammonite subfamily Mantelliceratinae are a cosmopolitan group of predominantly Early Cenomanian distribution, characterized by the absence of siphonal tubercles, and the presence of both inner and outer ventrolateral tubercles. This double ventrolateral tuberculation distinguishes them from the Stoliczkaiellinae (formerly Stoliczkaiinae, see Cooper 2012), from which they arose, and is a marker for the recognition of Early Cenomanian ammonite faunas. Previous records from northern KwaZulu-Natal are slight. As described below, Acanthoceras nitidum Crick, 1907 (p. 201, pl. 12, fig. 4), is a Mantelliceras, and the lectotype and one of the paratypes of Acanthoceras (Mantelliceras) falloti Collignon, 1931 (p. 81 (41) (pars), pl. 8 (4), figs 11, 12 only) is a Sharpeiceras, both species being based on material from the classic locality, the Skoenberg, northeast of Hluhluwe, CONTENTSAfrican Natural and corresponding to localities 61 and 62 of Kennedy & Klinger (1975). Sharpeiceras florencae Spath, 1925 (p. 198, pl. 27) was based on a large individual from what Spath termed Maputoland; we presume it to be from northeastern KwaZulu-Natal, possibly the area around Ndumu. Additional species were listed by Kennedy & Klinger (1975). We revise these species, and describe a total of seventeen, one of which is new. Eight of these have a relatively cosmopolitan distribution; the remainder are best known from sub-Saharan Africa and Madagascar. CONVENTIONSDimensions are given in millimetres: D = diameter; Wb = whorl breadth; Wh = whorl height; U = umbilicus; c = costal dimension; ic = intercostal dimension. Figures in brackets are dimensions as a percentage of the diameter. The suture terminology is that of Korn et al. (2003): E = external lobe; A = adventive lobe (= lateral lobe, L, of Kullmann & Wiedmann, 1970); U = umbilical lobe; I = internal lobe.BMNH: The Natural History Museum, London. SAM: The South African Museum, Cape Town. OUM: Oxford University Museum of Natural History.LOCALITY D...

Coilopoceras inflatum Cobban and Hook, 1980, a United States Western Interior ammonite from the Upper Turonian of the southern Corbières, Aude, France

“…3 as a further example of the species (it was originally referred to Ammonites sacya Forbes, 1846, by Stoliczka). It is a phragmocone 120 mm in diameter, with whorl proportions, lirae, and collar ribs are as in the present specimen DISCUSSION: Anagaudryceras involvulum is readily distinguished from most other species of Anagaudryceras in that it does not, so far as is known, developing fold-like major ribs in the later ontogenetic stages, as in other species of the genus described by Kennedy and Klinger (1979) and Matsumoto (1995). The latter referred Anagaudryceras involvulum of Howarth (1966, p. 219, pl .…”

The ammonite genus Prionocycloceras , from the Coniacian of KwaZulu-Natal, South Africa

“…This note continues the revision of the Cretaceous ammonite faunas from Eastern Cape Province and KwaZulu-Natal, the publication of which we began forty years ago (Kennedy and Klinger 1975). Here we revise two of the species assigned to the genus Subprionocyclus Shimizu, 1932, by Van Hoepen (1968), and refer them to Prionocycloceras Spath, 1926.…”

The Upper Campanian – lower Maastrichtian cephalopod fauna of Botellos, Nuevo León: a key to understand faunal turnover across the Campanian–Maastrichtian boundary in NE Mexico

“…43 ammonoid taxa were documented across the Campanian-Maastrichtian boundary of this well-documented section ; and further material summarized in Pseudophyllites indra is documented in North America from near the base of the Maastrichtian and above, but the species occurs much earlier in Europe and the southern hemisphere (Wiedmann 1962; e.g. Kennedy and Klinger 1977;Kaplan et al 2005). H. (N.) surya is considered to be an entirely Maastrichtian species, its FO at the base level in Tercis is thus very early.…”

“…Saghalinites cala, P. indra, A. politissimum and T. superstes have similar ranges at a global scale; their absence in NE Mexico in beds older than the latest Campanian, or even at the base of the Maastrichtian, is explained by endemism as discussed by . Saghalinites cala, particularly Unauthenticated Download Date | 5/12/18 6:08 PM abundant at Botellos, first occurs in the Campanian of South Africa (Kennedy and Klinger 1977), but is also known from the Maastrichtian of Europe (Ward and Kennedy 1993); in North America it was only documented from the Maastrichtian of Mexico.…”