A Revision Of The Turonian Members Of The Ammonite Subfamily Collignoniceratinae From The United States Western Interior And Gulf Coast Author KENNEDY, W. JAMES Author COBBAN, WILLIAM A. Author LANDMAN, NEIL H. text Bulletin of the American Museum of Natural History 2001 2001-12-13 2001 267 1 148 http://www.bioone.org/perlserv/?request=get-abstract&doi=10.1206%2F0003-0090(2001)267%3C0001%3AAROTTM%3E2.0.CO%3B2 journal article 10.1206/0003-0090(2001)267<0001:AROTTM>2.0.CO;2 0003-0090 5382148 Genus Cibolaites Cobban and Hook, 1983 TYPE SPECIES: Cibolaites molenaari Cobban and Hook, 1983: 16 , pl. 2, figs. 1–9; pl. 3, figs. 3–8; pl. 8, figs. 6–8; pl. 13, figs. 1– 5; pl. 14; text­figs. 13, 14; lower Turonian Mammites nodosoides Zone , west­central New Mexico . DIAGNOSIS: A medium­size genus, largest known adults 120 mm in diameter; dimorphism not demonstrated. Coiling involute with small umbilicus, whorl section compressed to depressed, intercostal section with convergent sides and fastigiate venter, costal section markedly concave between tubercles. Strong conical umbilical bullae give rise to primary ribs singly or in pairs with shorter, intercalated ribs, all with ventrolateral and siphonal clavi on phragmocone. Umbilical bullae decline on the adult body chamber, which is flat­sided with crowded weak primary and intercalated Fig. 22. Collignoniceras woollgari regulare (Haas, 1946) . A–C . USNM 498244, robust form from locality 8. D, E . USNM 498245; F . USNM 498246; G, H. USNM 498247, all robust forms from locality 7. All figures are ×1. Fig. 23. Collignoniceras woollgari regulare (Haas, 1946) . A–C . USNM 498226, gracile form from locality 8. D, E . USNM 252723, gracile form from locality 7. All figures are ×1. Fig. 24. Collignoniceras woollgari regulare (Haas, 1946) . USNM 420012, robust form from locality 62. Figures are ×0.80. ribs; ventrolateral and siphonal tubercles decline progressively and the venter flattens towards the adult aperture. Suture relatively simple with broad, littledivided saddles and narrower, rectangular lobes. DISCUSSION: Coarse tuberculation and presence of only a single row of ventrolateral tubercles distinguishes Cibolaites from all other genera currently referred to the Collig­ noniceratinae. Cibolaites superficially resembles Barroisiceras de Grossouvre, 1894 , and Subbarroisiceras Basse, 1946 , of the upper Turonian–Coniacian Barroisiceratinae . However, they differ in sutural characteristics, while both are more involute than Cibolaites , with smaller umbilici and crenulate keels; in Cibolaites there is no continuous keel and the siphonal clavi are separated by smooth interspaces. Fig. 25. Collignoniceras woollgari regulare (Haas, 1946) . USNM 498248, robust form from locality 14. Figures are ×0.80. Fig. 26. Collignoniceras woollgari regulare (Haas, 1946) . A, B . Muséum National d’Histoire Naturelle, Paris, no. 6778 ( ex d’Orbigny Collection), from the Middle Turonian of Ponce´, Sarthe, France. C . Faculté des Sciences, Rennes, no. C273, also from Ponce´. D, E . Same collection as A, B, no. W1, from ‘‘Le Mans, Sarthe,’’ France. All figures are ×1. OCCURRENCE: Upper Cenomanian Neocardioceras juddii Zone in Devon , England and Aube, France ; lower Turonian Mammites nodosoides Zone , immediately below first appearance of C. woollgari woollgari of the middle Turonian in west­central New Mexico; M. nodosoides Zone, N.W. Germany ; also recorded from northern Spain (Kaplan, 1988) and from Tunisia (Chancellor et al., 1994). Fig. 27. Collignoniceras woollgari regulare (Haas, 1946) . A, B . BMNH 4863, from ‘‘near Lewes,’’ Sussex, England ( ex J. de C. Sowerby Collection). C, D . BMNH 4863a, from the same locality. E . paralectotype BMNH 5742b. F . Paralectotype BMNH 5742a, both from near Lewes, Sussex. G . BMNH C82268, from the Middle Turonian Middle Chalk, upper Terebratulina lata Zone, Mickleham Bypass , Surrey, England. All figures are ×1. Cibolaites molenaari Cobban and Hook, 1983 Figures 5–8 Collignoniceras sp. Wright and Kennedy, 1981: 107, pl. 8, fig. 17. Cibolaites molenaari Cobban and Hook, 1983: 16, pl. 2, figs. 1–9; pl. 3, figs. 3–8; pl. 8, figs. 6–8; pl. 13, figs. 1–5; pl. 14; text­figs. 13, 14. Cibolaites molenaari Cobban and Hook. Kennedy et al., 1986: 209, text­fig. 5i, j, k, l.