Gastroplites canadensis, from Wright et al. (1996).

Belongs within: Hoplitaceae.

The Gastroplitinae are a Cretaceous (Lower Albian to Cenomanian) lineage of ribbed ammonites (Wright et al. 1996).

Characters (from Wright et al. 1996): Primitive arched venter broadening; whorl section may become square. Ribs mostly branching in pairs from thin, oblique umbilical bullae and may become flattened. Ventrolateral tubercles and later siphonal tubercles or keel tending to appear. Sutures very variable within species and individuals in proportion of elements and degree of incision, but normally L wide and divided by one or two large folioles.

<==Gastroplitinae [Gastroplitidae]WCH96
    |--Irenicoceras Warren & Stelck 1958WCH96
    |    `--*I. bahani Warren & Stelck 1958WCH96
    |--Alopecoceras Kennedy & Klinger 1978WCH96
    |    `--*A. ankeritterae Kennedy & Klinger 1978WCH96
    |--Neogastroplites McLearn 1931 [incl. Beattonoceras Warren & Stelck 1958]WCH96
    |    |--*N. cornutus (Whiteaves 1885) [=Buchiceras cornutum]WCH96
    |    `--*Beattonoceras’ beattonense Warren & Stelck 1958WCH96
    |--Sokolovites Casey 1966 [incl. Cleogastroplites Jeletzky 1980]WCH96
    |    |--*S. subdragunovi Casey 1966WCH96
    |    `--S. aberrans (Jeletzky 1980) [=*Cleogastroplites aberrans]WCH96
    |--Pseudopulchellia Imlay 1961 [incl. Stelckiceras Jeletzky 1980]WCH96
    |    |--*P. pattoni Imlay 1961WCH96
    |    |--P. imlayiWCH96
    |    `--P. liardense (Whiteaves 1889) [=Placenticeras perezianum var. liardense, *Stelckiceras liardense]WCH96
    `--Gastroplites McLearn 1930WCH96
         |--G. (Gastroplites) (see below for synonymy)WCH96
         |    |--*G. (G.) canadensis (Whiteaves 1893) [=Hoplites canadensis]WCH96
         |    |--G. (G.) arcticus (Jeletzky 1980) [=*Pseudogastroplites arcticus]WCH96
         |    |--G. (G.) crowensis (Jeletzky 1980) [=*Stotticeras crowense]WCH96
         |    `--G. (G.) tozeri (Jeletzky 1980) [=*Anagastroplites tozeri]WCH96
         `--G. (Paragastroplites Imlay 1961)WCH96
              `--G. (*P.) spiekeri McLearn 1931WCH96

Gastroplites McLearn 1930 (Gastroplites) [incl. Anagastroplites Jeletzky 1980, Pseudogastroplites Jeletzky 1980, Stotticeras Jeletzky 1980]WCH96

*Type species of generic name indicated


[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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