Diplomoceratidae

Pseudoxybeloceras quadrinodosum, from here.

Belongs within: Turrilitaceae.

The Diplomoceratidae are an Upper Cretaceous (Turonian to Upper Maastrichtian) assemblage of heteromorph ammonites (Wright et al. 1996).

Characters (from Wright et al. 1996): Tending to lose helical coiling. Initial stage commonly (perhaps always) straight, smooth, and with constrictions. Extreme ptychoceratoid forms develop. Typically with sharp, annular, nontuberculate ribs, but ventrolateral spines occurring in some genera. Suture florid, sometimes tending to simplify.

<==Diplomoceratidae [Neocrioceratinae]
    |--Diplomoceratinae [Scalaritinae]WCH96
    |    |--Neancyloceras Spath 1926WCH96
    |    |    `--*N. bipunctatum (Schlüter 1872) [=Ancyloceras bipunctatum]WCH96
    |    |--Smedaliceras Young 1963WCH96
    |    |    `--*S. durhami Young 1963WCH96
    |    |--Chesapeakella Kennedy & Cobban 1993WCH96
    |    |    `--*C. nodatum Kennedy & Cobban 1993WCH96
    |    |--Neocrioceras Spath 1921 [=Cyrtohamites Shimizu 1933]WCH96
    |    |    `--*N. spinigerum (Jimbo 1894) [=Crioceras spinigerum, *Cyrtohamites spinigerus]WCH96
    |    |--Scalarites Wright & Matsumoto 1954 [incl. Trianglites Matsumoto 1977]WCH96
    |    |    |--*S. scalare (Yabe 1904) [=Helicoceras scalare]WCH96
    |    |    `--S. antiquus (Matsumoto 1977) [=*Trianglites antiquus]WCH96
    |    |--Neoglyptoxoceras Collignon 1969 [incl. Epiglyptoxoceras Collignon 1969]WCH96
    |    |    |--*N. magnificum Collignon 1969WCH96
    |    |    `--*Epiglyptoxoceras’ abnorme Collignon 1969WCH96
    |    |--Glyptoxoceras Spath 1925 [incl. Neohamites Brunnschweiler 1966]WCH96
    |    |    |--*G. rugatum (Forbes 1846) [=Hamites rugatus]WCH96
    |    |    |--*Neohamites’ giraliensis Brunnschweiler 1966WCH96
    |    |    |--G. indicumWCH96
    |    |    `--G. subcompressumWCH96 [=Diplomoceras (Glyptoxoceras) subcompressumW69]
    |    |--Exiteloceras Hyatt 1894 [incl. Axonoceras Stephenson 1941, Exicrioceras Anderson 1958]WCH96
    |    |    |--*E. jenneyi (Whitfield 1880) [=Ancyloceras jenneyi]WCH96
    |    |    |--*Axonoceras’ compressum Stephenson 1941WCH96
    |    |    |--‘Axonoceras’ multicostatumK79
    |    |    |--*Exicrioceras’ ortigalitense Anderson 1958WCH96
    |    |    `--‘Axonoceras’ pingueK79
    |    `--Diplomoceras Hyatt 1900 [incl. Eudiplomoceras Brunnschweiler 1966]WCH96
    |         |--*D. cylindraceum (Defrance 1816) [=Baculites cylindracea]WCH96
    |         |--D. australeOZ89
    |         |--‘Hamites’ elatior (n. d.)OZ89
    |         |--D. lambi Spath 1953OZ89
    |         |--D. maximum Olivero & Zinsmeister 1989OZ89
    |         |--D. notabileWCH96
    |         `--*Eudiplomoceras’ raggatti Brunnschweiler 1966WCH96
    `--Polyptychoceratinae [Polyptychoceratidae]WCH96
         |--Cyrtoptychoceras Kennedy & Henderson 1992WCH96
         |    `--*C. undulatus (Forbes 1846) [=Hamites undulatus]WCH96
         |--Rhyoptychoceras Matsumoto 1977WCH96
         |    `--*R. mikasaense Matsumoto 1977WCH96
         |--Ryugasella Wright & Matsumoto 1954WCH96
         |    `--*R. ryugasensis Wright & Matsumoto 1954WCH96
         |--Astreptoceras Henderson 1970WCH96
         |    `--*A. zelandicum (Marshall 1926) [=Ptychoceras zelandicum]WCH96
         |--Masonites Henderson 1970WCH96
         |    `--*M. biannulatus Henderson 1970WCH96
         |--Solenoceras Conrad 1860 [incl. Oxybeloceras Hyatt 1900]WCH96
         |    |--*S. annuliferum (Morton 1842) [=Hamites annulifer]WCH96
         |    |--‘Ptychoceras’ crassum Whitfield 1880 [=*Oxybeloceras crassum]WCH96
         |    `--S. multicostatumWCH96
         |--Polyptychoceras Yabe 1927WCH96
         |    |--P. (Polyptychoceras) [incl. Dihamites Matsumoto 1977, Heteroptychoceras Matsumoto 1977]WCH96
         |    |    |--*P. (P.) pseudogaultinum (Yokoyama 1890) [=Ptychoceras pseudogaultinum]WCH96
         |    |    |--*Heteroptychoceras’ obatai Matsumoto 1977WCH96
         |    |    |--*Dihamites’ obiriaensis Matsumoto 1977WCH96
         |    |    `--P. (P.) obstrictumWCH96
         |    |--P. (Phylloptychoceras Spath 1953) [incl. Neocyrtochilus Anderson 1958]WCH96
         |    |    |--P. (*P.) sipho (Forbes 1846) [=Ptychoceras sipho]WCH96
         |    |    `--*Neocyrtochilus’ bryani Anderson 1958WCH96
         |    `--P. (Subptychoceras Shimizu 1935)WCH96
         |         `--P. (*S.) yubarense (Yabe 1927) [=Hamites (Polyptychoceras) yubarensis]WCH96
         `--Pseudoxybeloceras Wright & Matsumoto 1954WCH96
              |--*P. (Pseudoxybeloceras) quadrinodosum (Jimbo 1894) [=Hamites quadrinodosus]WCH96
              |--P. (Lewyites Matsumoto & Miyauchi in Matsumoto 1984)WCH96
              |    `--P. (*L.) oronensis (Lewy 1969) [=Idiohamites oronensis]WCH96
              |--P. (Parasolenoceras Collignon 1969) [incl. Cyphoceras Ward & Mallory 1977]WCH96
              |    |--P. (*P.) splendens (Collignon 1969) [=*Parasolenoceras splendens]WCH96
              |    |--‘Ancyloceras’ lineatum Gabb 1869 [=*Cyphoceras lineatum]WCH96
              |    `--P. (P.) nanaimoenseWCH96
              `--P. (Schlueterella Wiedmann 1962) [incl. Christophoceras Collignon 1969, Kawashitaceras Matsumoto 1984]WCH96
                   |--P. (*S.) pseudoarmatum (Schlüter 1872) [=Ancycloceras pseudoarmatum]WCH96
                   |--‘Neocrioceras’ dentatum Matsumoto & Obata 1981 [=*Kawashitaceras dentatum]WCH96
                   `--P. (S.) ramboulai (Collignon 1969) [=*Christophoceras ramboulai]WCH96

*Type species of generic name indicated

References

[K79] Kauffman, E. G. 1979. Cretaceous. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A418–A487. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[OZ89] Olivero, E. B., & W. J. Zinsmeister. 1989. Large heteromorph ammonites from the Upper Cretaceous of Seymour Island, Antarctica. Journal of Paleontology 63 (5): 626–636.

[W69] Wiedmann, J. 1969. The heteromorphs and ammonoid extinction. Biological Reviews 44: 563–602.

[WCH96] Wright, C. W., J. H. Calloman & M. K. Howarth. 1996. Treatise on Invertebrate Paleontology pt L. Mollusca 4, revised vol. 4. Cretaceous Ammonoidea. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

Leave a comment

Your email address will not be published. Required fields are marked *