Dinodus lobatus from the Tournaisian Wapnica beds of Dzikowiec.

Dinodus lobatus (Branson & Mehl, 1934) (P₁ element) from the marly intercalations in shales of the Radlin beds of the Ostrówka quarry in the Holy Cross Mts.

Apparatus composition of Dinodus lobatus

Diagnoza

The sp element of this species is very characteristic and there is no problem with its distinction from associated conodont elements. The basal cavity is distinctly polygnathid, similar to associated and stratigraphically lower P fornicatus but not like any species of Siphonodella. No sp specimens with transitional morphology between these two species have been found in Dzikowiec, but juveniles of D. Iobatus are of the same morphology as some specimens of P. fomicatus.

The oz elements of Elictognathus lacerata Branson & Mehl, 1934 type and the symmetry transition series (including also the ne elements) of Dinodus occur consistently together with sp elements of this species. This set of elements had been considered as possibly representing the Siphorndella apparatus by Sandberg et aI. (1978), but this is contradicted by virtual lack of such elements in the richest samples of Siphonodella sp elements in Dzikowiec (for instance Dz-15, but also Dz-46). Instead, their distribution fits that of the sp elements that are here proposed to form the same apparatus but not being related to true Siphonodella.

The type population of Siphonodella lobata comes from the Bushberg sandstone at Brickeys in Missouri, the holotype being an adult specimen (Branson & Metrl 1934: pI.24: 14, l5).

Porównanie

Autekologia

Występowanie geograficzne

Zasięg czasowy

Materiały muzealne

Literatura

Dzik, J. 1997. Emergence and succession of Carboniferous conodont and ammonoid communities in the Polish part of the Variscan sea. Acta Palaeontologica Polonica 42, 57-170.