Drygantacanthus, Voichyshyn & Szaniawski, 2018

Voichyshyn, Victor & Szaniawski, Hubert, 2018, New ischnacanthiform jaw bones from the Lower Devonian of Podolia, Ukraine, Acta Palaeontologica Polonica 63 (2), pp. 327-339 : 329-330

Genus Drygantacanthus nov.

Type species: Drygantacanthus semirotunda sp. nov., by monotypy, see below.

Species included: The type species only.

Etymology: In honour of Daniel Drygant ( SMNH) who found the material under description, and from Latin acanthus, thorn.

Diagnosis.—Medium sized podoliacanthids with dentigerous jaw bone possessing bulky dome-shaped teeth of the lateral tooth row with a set of 4–6 denticles in a semicircular arrangement medially.

Remarks.— Drygantacanthus gen. nov. differs from Podoliacanthus by the possession of more massive teeth of the lateral tooth row, with a posterior and anterior flange of equal size, as well as the different type of additional dentition on their medial side (see the genus diagnosis above). Differences between the genera also occur in terms of the shape of teeth, as well as their parabasal section and inter-tooth pits. Judging by the available material of both genera, another possible difference can be observed in general jaw bone size.

The new genus differs from Kasperacanthus gen. nov. in possessing a different teeth shape within the lateral tooth row, with additional dentition on their medial side, and a solid inter-tooth wall without gaps.

Stratigraphic and geographic range.—Lower Devonian, Early Pragian?) of Podolia, Ukraine.