| Basic info | Taxonomic history | Classification | Included Taxa |
| Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Monodonta (Incisilabium) piruensis
Taxonomy
Monodonta (Incisilabium) piruensis was named by Squires (1987). Its type specimen is LACMIP 7441 and is a 3D body fossil.
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Monodonta (Incisilabium) piruensis Squires p. 22 figs. Figures 12, 13 |
Is something missing? Join the Paleobiology Database and enter the data
|
|
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Monodonta (Incisilabium) piruensis Squires 1987
show all | hide all
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires 1987 | Generic assignment based on globose-turbinate shape , weak spiral sculpture , and single broad tooth at base of columella. Subgeneric assignment based on noded spiraJ ribs. Specific assignment based on nodose spiral ribs only on posterior half of bod y whorl , 18 primary spiraJ ribs on body whorl, and moderately thick callus along inner lip.
Monodonta (Jncisilabium?) piruensis new species most closely resembles M. (lncisilabium) parisiensis Deshayes (1832:248-249 , pl. 32, figs. 8, 9; Cossmann and Pissarro , 1910- 1913:pl. 3, fig. 22-1; Wenz , 1938:299 , fig. 656) from middle and late Eocene strata of the Paris Basin, France. Monodonta (/.?) piruensis differs from examined specimens of M. (lncisilabium) parisiensis in the following features: less strongly nodose spiral ribs , more closely spaced spira l ribs , nodose spiral ribs only on posterior half of body whorl rather than over ent ire bod y whorl , and about 18 rather than ten primary spira l ribs on body whorl. Monodonta (lncisi/abium?) piruensis new species superfi- cially resembles Homalopoma wattsi (Dickerson , 1916:494 , pl. 40, figs. 3a, b; Turner , 1938:96, pl. 15, fig. 16; Vokes, 1939: 179, pl. 22, figs. 21, 22; Weaver , 1943:298 , pl. 64, figs 11, 14) from "C apay Stage" strata , Coalinga area , central Ca lifornia , through southwestern Oregon. Monodonta (/. ?) piruensis differs from the holotype of H. wattsi in the fol- lowing fea tur es: much stronger nodose primary spiral ribs , stronger spiral ribs on base of shell, large deltoid flat tooth at base of columella , thick callus aJong inner lip, shallow groove in umbilical area , absence of a finely spiral-ribbed collar below the suture , and absence of a tooth in center of basal lip. Monodonta (lncisilabium ?)piruensis new species also su- perficially resembles Homalopoma umpquaensis Merriam and Tu rner (I 937: 104, pl. 6, fig. 6; Turner , 1938:95- 96, pl. 15, .fig. 14; Weaver , 1943:299 , pl. 64, figs. 20- 2 1; Givens , 1974: 61, pl. 5, fig. 3) from "Capay" and "Domengine" "stages" strata , Pine Mountain , southern California through south- western Oregon. Monodonta ([.?) piruensis differs from H. umpquaensis in the following features: nodose primary spiral ribs , secondary spiral ribs , seventh and eleventh spiral ribs not stronger than rest of ribs and do not form anguJations at center and lower margin of the body whorl , suture much less channeled (grooved), a large deltoid flat tooth at base of columella rath er than two smaJI teeth , and a shallow groove in umbilicaJ area. Vokes' (1939: 179-180 , pl. 22, fig. 27) Homalopoma umpquaensis domenginensis from the Domengine Forma- tion, Coalinga area , CaJifomia , is similar to H. umpquaensis s.s. In addition to the features listed in the preceding para- graph, M. (!.?) piruensis differs from Vokes' subspecies in that M. ([.?) pin1ensis does not have a strongly angulate body whorl and does not have just a small node along the basal inner lip. |