Gatunek typowy
J. oistodiformis sp. n. from the Famennian of the Holy Cross Mountains, Poland.

Opis

Tendency to develop geniculate ‘oistodontiform’ and symmetrical ‘erectiform’ elements in the apparatus, homeomorphic with the Ordovician Distacodontidae; weak morphologic disparity between probable P and S series. 

Mound (1968) and Wang and Wang (1978) illustrated several such elements under the generic name Drepanodina. Unfortunately, the holotype of Drepanodina lachrymosa Mound, 1968 from the late Famennian Upper Wabamun Group of Alberta, the type species of the genus, is probably a denticle of Pelekysgnathus, as suggested by the appearance of its base.

Synonimy

Zasięg czasowy

Literatura