Entogonites Kittl, 1904

Klug, Christian, Baets, Kenneth De & Korn, Dieter, 2016, Exploring the limits of morphospace: Ontogeny and ecology of late Viséan ammonoids from the Tafilalt, Morocco, Acta Palaeontologica Polonica 61 (1), pp. 1-14 : 7-9

Genus Entogonites Kittl, 1904

Type species: Tetragonites grimmeri Kittl, 1904 ; by monotypy; Bosnia-Herzegovina, Praca Dolnja , E of Sarajewo, early late Viséan .

Included species: Entogonites acus Korn and Titus, 2011: 134 , Utah; Entogonites borealis Gordon, 1957: 53 , Alaska; Entogonites bucheri sp. nov., herein, Anti-Atlas; Entogonites burbankensis Korn and Titus, 2011: 131 , Utah; Tetragonites grimmeri Kittl, 1904: 677 , Bosnia and Herzegovina; Pericyclus nasutus Schmidt, 1941: 151 , Harz; Entogonites saharensis Korn, Klug, and Mapes, 2005: 363 , Anti-Atlas; Gastrioceras ( Branneroceratoides ) tetragonum Kullmann, 1962: 88, NW Serbia.

Diagnosis.— Entogonitidae with simple ontogeny. Adult whorls slightly narrower umbilicate; inner whorls tetrangularly coiled (from Korn et al. 2010).

Stratigraphic and geographic range.—Mississippian (Late Viséan) of Alaska, Bosnia, Germany, Morocco, Poland,

Serbia, United Kingdom, and Utah. Entogonites saharensis Korn, Klug, and Mapes, 2005

Figs. 6 , 7 .

Type material: Holotype MB.C.5301 ; paratypes MB.C.5302–06.

Type locality: 12 km southeast of Dar Kaoua , southeast of Erfoud, eastern Anti –Atlas, Morocco .

Type horizon: Early late Viséan ( Entogonites assemblage).

Material.— 68 specimens displaying several ontogenetic stages 2 specimens in PIMUZ 31509 ; 2 specimens in PIMUZ 31509 ; 4 specimens in PIMUZ 31510 ; 5 specimens in PIMUZ 31511 ; 16 specimens in PIMUZ 31512 ; 2 specimens in PIMUZ 31517 ; 4 specimens in PIMUZ 31518 ; 9 specimens in PIMUZ 31519 ; 5 specimens in PIMUZ 31520 ).

Remarks.—In terms of ontogenetic morphologic data, not much can be appended to the original descriptions ( Korn et al. 2005). We add that the number or primary ribs varies on the quadratic whorls between 15 and 22 per half whorl. Not all ribs are dichotomous.

Stratigraphic and geographic range.—Early late Viséan, so far only known from the Tafilalt ( Morocco).

Figures

Fig. 6. Mass occurrence of juvenile ammonoids from the early late Viséan, 12 km SE of Dar Kaoua (Tafilalt, Morocco). A. PIMUZ 31518 with 4 specimens of Nomismoceras sp., 3 Prolecanites sp., 4 Entogonites saharensis Korn, Klug, and Mapes, 2005, 1 Calygirtyoceras darkaouaense Korn, Klug, and Mapes, 1999, and 2 Bollandites sp. B. PIMUZ 31508, overview; many taxa are indicated in the figure. All specimens whitened with NH4Clsublimate.

Fig. 7. Morphospace (UWI, umbilical width index; WER, whorl expansion rate; CWI, conch width index) with data of 3015 species of Palaeozoic ammonoids with additional points of the ammonoids from the early late Viséan of the Tafilalt (Morocco). Note that data points of juveniles (empty symbols) of Calygirtyoceras darkaouaense and Goniatites lazarus lie at the edge or outside of the cloud of 3015 species. Graph produced using JMP 11.