Mehlina strigosa

(Branson & Mehl, 1934) from the P. trachytera Zone at Kowala and the P. jugosus Zone at Ostrówka and Jabłonna in the Holy Cross Mountains.

Diagnoza

P₁ element with numerous (15-30) sharp-pointed denticles.

Porównanie

This is a highly variable species. From its predecessor, M. robustidentata, it differs not only in the pattern of denticulation but also in a tendency to develop somewhat widened flat basal cone in the P₁ element. In this respect it is somewhat similar to Dasbergina stabilis, from which it differs in the much higher sharp denticles on the dorsal process and, of course, the rest of the apparatus. Moreover, the widened basal cone of Dasbergina extends to the dorsal tip of the element. In P₁ elements of Pandorinellina vulgaris the basal cone is restricted to mid-length and is wide. Some extreme elements may be difficult to attribute to particular species of these genera. In fact only P₁ and M elements are diagnostic at the generic level.

S₁ elements with additional process co-occurring with other elements of the species are tentatively attributed to it, but similar elements are also associated with Dasbergina micropunctata. This issue remains to be clarified.

Autekologia

Występowanie geograficzne

Holy Cross Mountains.

Zasięg czasowy

Widespread in the late C. marginifera to P. jugosus Zones.

Materiały muzealne

ZPAL: 2,050 specimens.

Literatura

Dzik, J. 2006. The Famennian "Golden Age" of conodonts and ammonoids in the Polish part of the Variscan sea. Palaeontologia Polonica 63, 1-359.