Stephanocerataceae

Iniskinites magniformis, from here.

Belongs within: Aptychophora.
Contains: Arctocephalitinae, Cadoceratinae.

The Stephanocerataceae are a Jurassic group of ammonites, the shells of which commonly show sharp ribbing. This group includes the heteromorphic families Spiroceratidae and Acuariceratidae, in which the shells were openly coiled or arcuate (Wiedmann 1969).

Characters (from Engeser & Keupp 2002): Sphaerocone, cadicone or oxycone conchs, generally with sharp ribbing. Suture line complex with well-developed lateral and umbilical lobe.

<==<==Stephanocerataceae
    |  i. s.: Praestriaptychus EK02
    |--Normannites Munier-Chalmas 1892 [Otoitidae] EK02
    |--Cardioceratidae P87
    |    |  i. s.: Boreiocephalites P87
    |    |         Umaltites Sei & Kalacheva 1979 P87
    |    |         Cardioceras CDH04
    |    |           |--C. cordatum [=Ammonites cordatus] H04
    |    |           `--C. ovale (Quenstedt 1845) [=Ammonites alternans ovalis] CDH04
    |    |         Quenstedtoceras H79
    |    |--Arctocephalitinae P87
    |    `--Cadoceratinae P87
    |--+--Parkinsoniidae EK02
    |  |    |--Parkinsonia Bayle 1878 EK02
    |  |    |    `--‘Ammonites’ wuerttembergicus Oppel 1857 (see below for synonymy) CDH04
    |  |    `--Parastrenoceras W69
    |  |         `--‘Strenoceras’ lutetius W69
    |  `--+--Apsorroceras W69
    |     `--+--Spiroceras [Spiroceratidae] W69
    |        `--+--Parapatoceras W69
    |           |--Metapatoceras W69
    |           `--+--Infrapatoceras W69
    |              `--Acuariceratidae W69
    |                   |--Paracuariceras W69
    |                   `--Acuariceras W69
    |--Stephanoceratidae EK02
    |    |  i. s.: Stephanoceras Waagen 1869 EK02
    |    |           |--S. blagdeni F71
    |    |           |--S. calloviensis F71
    |    |           `--S. lamellosus F71
    |    |         Arkelloceras tozeri Frebold 1951 H79, P87
    |    |         Sohlites H79
    |    `--Cadomitinae P87
    |         |--Cadomites Munier-Chalmas 1892 P87
    |         |    |--C. crassispinosus Kopik 1974 P87
    |         |    `--C. rectelobatus P87
    |         `--Parareineckeia Imlay 1962 P87
    |              |--P. hickersonensis P87
    |              |--P. nelchinensis P87
    |              `--P. shelikofana P87
    `--Sphaeroceratidae EK02
         |--Sphaeroceras Bayle 1878 [Sphaeroceratinae] EK02
         |--Macrocephalitinae [Macrocephalitidae] P87
         |    |--Imlayoceras Frebold 1963 H79, P87
         |    `--Macrocephalites P87
         |         |--‘Ammonites’ jacquoti Douvillé 1878 (see below for synonymy) CDH04
         |         `--M. macrocephalus P87
         `--Eurycephalitinae P87
              |--Morrisiceras P87
              |--Megasphaeroceras P87
              |--Paracephalites Buckman 1929 [incl. Metacephalites Buckman 1929, Miccocephalites Buckman 1929] P87
              |--Loucheuxia Poulton 1987 P87
              |    `--*L. bartletti Poulton 1987 P87
              |--Eurycephalites Spath 1928 [incl. Buckmaniceras, Lilloettia, Warrenoceras Frebold 1963] P87
              |    |--E. codyense [=Arcticoceras codyense] P87
              |    |--‘Arcticoceras’ henryi P87
              |    `--‘Arcticoceras’ rierdonense P87
              `--Iniskinites Imlay 1975 P87
                   |--I. acuticostatus Imlay 1981 P87
                   |--I. magniformis P87
                   |--I. martini P87
                   |--I. robustus Frebold 1978 P87
                   |--I. tenasensis Frebold 1981 P87
                   |--I. varicostatus P87
                   `--I. yukonensis Frebold 1978 P87

‘Ammonites’ jacquoti Douvillé 1878 [=A. macrocephalus compressus Quenstedt 1847 nec A. compressus de Blainville 1840 nec A. radians compressus Quenstedt 1845 nec A. valdani compressus Quenstedt 1845 nec A. ornatus compressus Quenstedt 1846 nec A. parkinsoni compressus Quenstedt 1846, Macrocephalites compressus] CDH04

‘Ammonites’ wuerttembergicus Oppel 1857 [incl. Ammonites parkinsoni compressus Quenstedt 1846 nec A. compressus de Blainville 1840 nec A. radians compressus Quenstedt 1845 nec A. valdani compressus Quenstedt 1845 nec A. ornatus compressus Quenstedt 1846, Parkinsonia compresa] CDH04

*Type species of generic name indicated

REFERENCES

[CDH04] Callomon, J. H., D. T. Donovan & M. K. Howarth. 2004. F. A. Quenstedt’s trinomial nomenclature of Jurassic ammonites. Palaeontology 47 (4): 1063–1073.

[EK02] Engeser, T., & H. Keupp. 2002. Phylogeny of the aptychi-possessing Neoammonoidea (Aptychophora nov., Cephalopoda). Lethaia 35: 79–96.

[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1–167.

[H04] Haeckel, E. 1899–1904. Kunstformen der Natur. Bibliographisches Institut: Leipzig und Wien.

[H79] Hölder, H. 1979. Jurassic. In: Robison, R. A., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt A. Introduction. Fossilisation (Taphonomy), Biogeography and Biostratigraphy pp. A390–A417. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[P87] Poulton, T. P. 1987. Zonation and correlation of Middle Boreal Bathonian to Lower Callovian (Jurassic) ammonites, Salmon Cache Canyon, Porcupine River, northern Yukon. Geological Survey of Canada—Bulletin 358: 1–155.

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