Mortoniceras inflatum, copyright H. Zell.

Belongs within: Brancoceratidae.

The Mortoniceratinae are a Cretaceous (Middle Albian to Lower Cenomanian) lineage of ammonites with a shell bearing umbilical and often ventrolateral tubercles (Wright et al. 1996).

Characters (from Wright et al. 1996): Moderately involute to very evolute; whorl section more or less rounded, square, or compressed, with low to high keel; ribs branching or long and short, at least in early whorls, but may be single and equal on body chamber or earlier; ribs low and rounded, or flat, or high and rounded, but not high and sharp; at least umbilical tubercles occurring, normally also inner ventrolateral, and frequently lateral and outer ventrolateral; some species with up to five tubercles on a rib; spiral striation or notching of ribs common; aperture simple (in probable macroconchs) or with rostrum directed forward, upward, or backward (in probable microconchs). Suture generally with squarish, symmetrical, deeply and sharply indented saddles.

<==Mortoniceratinae [Arestoceratidae, Cainoceratidae, Inflaticeratidae, Mortoniceratidae, Pervinquieriidae]WCH96
    |--Neoharpoceras Spath 1921WCH96
    |    `--*N. hugardianum (Orbigny 1841) [=Ammonites hugardianus]WCH96
    |--Cantabrigites Spath 1933WH96
    |    `--*C. cantabrigense (Spath 1932)WCH96 (see below for synonymy)
    |--Euhystrichoceras Spath 1923WCH96
    |    |--*E. nicaisei (Coquand 1862) [=Ammonites nicaisei]WCH96
    |    `--E. baylissiP93
    |--Arestoceras Hoepen 1942 [incl. Tetagmenoceras Hoepen 1942]WCH96
    |    |--*A. collinum Hoepen 1942WCH96
    |    `--*Tetagmenoceras’ tumulosum Hoepen 1942WCH96
    |--Prohysteroceras Spath 1921SCH96
    |    |--*P. wordiei Spath 1922WCH96
    |    |--P. angolaenseF71
    |    `--P. richardsi [incl. Schloenbachia rostratus var. antipodeus Etheridge 1909, P. richardsi var. nitidum]F71
    |--Elobiceras Spath 1921WCH96
    |    |--*E. (Elobiceras) elobiense (Szajnocha 1885) [=Schloenbachia elobiensis]WCH96
    |    `--E. (Craginites Young 1957)WCH96
    |         `--E. (*C.) serratescens (Cragin 1893) [=Schloenbachia leonensis var. serratescens]WCH96
    |--Algericeras Spath 1925 [incl. Prionocycloides Spath 1925]WCH96
    |    |  i. s.: ‘Ammonites’ proratus Coquand 1880 [=*Prionocycloides proratus]WCH96
    |    |--*A. (Algericeras) boghariense (Coquand 1880) [=Ammonites boghariensis]WCH96
    |    `--A. (Sakondryella Collignon 1964)WCH96
    |         `--A. (S.) remolinense (Böse 1928) (see below for synonymy)WCH96
    |--Goodhallites Spath 1932 (see below for synonymy)WCH96
    |    |--*G. goodhalli (Spath 1932) [=Ammonites goodhalli]WCH96
    |    |--*Letheceras’ complanatum Hoepen 1942WCH96
    |    |--*Lethargeceras’ incommodum Hoepen 1942WCH96
    |    |--*Aidoceras’ jubatum Hoepen 1946WCH96
    |    `--G. liber (Hoepen 1942) [=*Cainoceras liberum]WCH96
    `--Mortoniceras Meek 1876WCH96
         |--M. (Mortoniceras) (see below for synonymy)WCH96
         |    |--*M. (M.) vespertinum (Morton 1834) [=Ammonites vespertinus]WCH96
         |    |--*Ameleceras’ abjectum Hoepen 1942WCH96
         |    |--M. (M.) inflatum (Sowerby 1817) [=Ammonites inflatus, *Inflaticeras inflatum, *Pervinquieria inflata]WCH96
         |    |--*Ophryoceras’ jugosum Hoepen 1942WCH96
         |    |--‘Ammonites’ leonensis Conrad 1857 [=*Leonites leonensis]WCH96
         |    |--‘Pervinquieria (*Subpervinquieria)’ luppovi Mirzoev 1969WCH96
         |    |--‘Pervinquieria (*Styphloceras)’ nodosocostata Hoepen 1951WCH96
         |    |--*Rusoceras’ nothum Hoepen 1946WCH96
         |    |--‘Pervinquieria (*Omocrateceras)’ planiventer Hoepen 1951WCH96
         |    |--M. (M.) rostratum (Sowerby 1817)WCH96 (see below for synonymy)
         |    `--‘Pervinquieria (*Collignonia)’ undulatocostata Hoepen 1951WCH96
         |--M. (Angolaites Spath 1932) [incl. Praeangolaites Collignon 1979]WCH96
         |    |--M. (*A.) gregoryi (Spath 1922) [=Pervinquieria gregoryi]WCH96
         |    `--*Praeangolaites’ galvaoi Collignon 1979WCH96
         |--M. (Boesites Young 1968)WCH96
         |    |--M. (*B.) romeri (Haas 1942) [=Pervinquieria romeri]WCH96
         |    |--‘Boesites’ gracilisK81
         |    `--‘Boesites’ primorisK81
         |--M. (Deiradoceras Hoepen 1931) (see below for synonymy)WCH96
         |    |--M. (*D.) prerostratum (Spath 1921) [=Inflaticeras prerostratum]WCH96
         |    |--*Mimoceras’ binodosum Hoepen 1941 [=*Mimeloceras binodosum]WCH96
         |    `--*Drepanoceras’ undatum Hoepen 1931WCH96
         |--M. (Drakeoceras Young 1957)WCH96
         |    `--M. (*D.) drakei (Young 1957) [=*Drakeoceras drakei]WCH96
         |--M. (Durnovarites Spath 1932) [incl. Reyreiceras Collignon 1979]WCH96
         |    |--M. (*D.) perinflatum (Spath 1922) [=Subschloenbachia perinflata]WCH96
         |    `--*Reyreiceras’ reyrei Collignon 1979WCH96
         `--M. (Pagoceras Hoepen 1951) [incl. Poikiloceras Hoepen 1951]WCH96
              |--M. (*P.) amplificatum (Hoepen 1951) [=*Pagoceras amplificatum]WCH96
              `--*Poikiloceras’ firmum Hoepen 1951WCH96
Nomen nudum: Mortoniceras (Durnovarites) subquadratum Spath 1932WCH96

Algericeras (Sakondryella) remolinense (Böse 1928) [=Euhystrichoceras remolinense; incl. E. (*S.) madagascariense Collignon 1964]WCH96

*Cantabrigites cantabrigense (Spath 1932)WCH96 [=Mortoniceras (*Cantabrigites) cantabrigenseWCH96, Hysteroceras (C.) cantabrigenseC81]

Goodhallites Spath 1932 [incl. Aidoceras Hoepen 1946, Cainoceras Hoepen 1942, Lethargeceras Hoepen 1942, Letheceras Hoepen 1942]WCH96

Mortoniceras (Deiradoceras Hoepen 1931) [incl. Drepanoceras Hoepen 1931 non Stein 1878, Mimeloceras Hoepen 1944, Mimoceras Hoepen 1941 non Hyatt 1884]WCH96

Mortoniceras Meek 1876 (Mortoniceras) [incl. Ameleceras Hoepen 1942, Collignonia Hoepen 1951, Inflaticeras Stieler 1920, Leonites Spath 1932, Omocrateceras Hoepen 1951, Ophryoceras Hoepen 1942, Pervinquieria Böhm 1910, Rusoceras Hoepen 1946, Styphloceras Hoepen 1951, Subpervinquieria Mirzoev 1969, Subschloenbachia Spath 1921]WCH96

Mortoniceras (Mortoniceras) rostratum (Sowerby 1817)WCH96 [=Ammonites rostratusWCH96, Pervinquieria (*Subschloenbachia) rostrataC81, WCH96]

*Type species of generic name indicated


[C81] Callomon, J. H. 1981. Dimorphism in ammonoids. In: House, M. R., & J. R. Senior (eds) The Ammonoidea: The evolution, classification, mode of life and geological usefulness of a major fossil group pp. 257–273. Academic Press.

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

[K81] Kullmann, J. 1981. Carboniferous goniatites. In: House, M. R., & J. R. Senior (eds) The Ammonoidea: The evolution, classification, mode of life and geological usefulness of a major fossil group pp. 37–48. Academic Press.

[P93] Page, K. N. 1993. Mollusca: Cephalopoda (Ammonoidea: Phylloceratina, Lytoceratina, Ammonitina and Ancyloceratina). In: Benton, M. J. (ed.) The Fossil Record 2 pp. 213–227. Chapman & Hall: London.

[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).

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