Dasbergoceratidae, Korn, 2025

Family Dasbergoceratidae fam. nov.

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Fig. 7 View Fig

Type genus

Dasbergoceras Dzik & Korn, 1992 .

Diagnosis

Family of the superfamily Trigonoceratoidea with a subevolute conch with very small whorl overlap; large umbilical foramen. Whorl profile in the adult stage rounded trapezoidal and depressed oval in the early juvenile stage. Ornament with transverse ribs. Position of the siphuncle closer to the venter than to the centre. Suture line with broadly rounded shallow lobes and low saddles.

Etymology

The family name refers to the type genus.

Included genus

Dasbergoceras Dzik & Korn, 1992 (Famennian; 1 species).

Remarks

Dzik & Korn (1992) devoted a separate paper to the genus Dasbergoceras ( Fig. 7 View Fig ), discussing the importance of this Late Devonian genus as a link between Devonian and Carboniferous curved and coiled nautiloids. Apparently, no other material has been described since. Therefore, the question of whether Dasbergoceras is a direct ancestor of the Carboniferous Trigonoceratoidea or whether it is a side branch of the Trigonoceratoidea cannot be answered unequivocally. Dasbergoceras has morphological peculiarities that distinguish it from all other genera of the Trigonoceratoidea . These include the subventrally located siphuncle and the radial ribbing. For this reason, an independent family Dasbergoceratidae fam. nov. is proposed here.