Breviconoteuthis Rieber, 1973

Košťák, Martin, Schlögl, Ján, Fuchs, Dirk, Havrila, Milan, Kolar-Jurkovšek, Tea, Vörös, Attila, Havelcová, Martina, Šurka, Juraj, Havrila, Jakub & Holcová, Katarína, 2024, Rare Middle Triassic coleoids from the Alpine-Carpathian system: new records from Slovakia and their significance, Swiss Journal of Palaeontology (19) 143 (1), pp. 1-19 : 12

Genus Breviconoteuthis Rieber, 1973

Type species: Atractites breviconus Reis, 1907 ; p. 148, pl. 3. fig. 3 by monotypy.

Diagnosis (after Fuchs & Donovan, 2018): Phragmocone very small to small, brevi- to slightly cyrtoconic, circular in cross section, apical angle 38°–40°; ratio of chamber length to diameter about 0.15; pro-ostracum three-lobed, longer than phragmocone, anterior median field rounded; siphuncle marginal; rostrum unknown.

Diagnosis (emended): Phragmocone very small to small sized, brevi- to slightly cyrtoconic, circular in cross section, apical angle 30–40°; ratio of chamber length to diameter between 0.15–0.25; pro-ostracum three-lobed, longer than phragmocone, anterior median field rounded; siphuncle marginal; rostrum unknown.

Stratigraphic and geographic occurrences: So far known only from the upper Anisian (Wettersteinkalk) of Austria (Tyrol), Switzerland ( Fuchs & Donovan, 2018) and Slovakia (Anisian—lower Illyrian; this paper).

Remarks: Breviconoteuthis and the slightly younger genus Phragmoteuthis Mojsisovics, 1882 (Carnian), the eponym of the order Phragmoteuthida , share a three-lobed proostracum morphology. Therefore, both genera can presently be distinguished only by phragmocone characters. The phragmocone of Breviconoteuthis displays a ventral curvature that is so far unknown in Phragmoteuthis .

The genus Zugmontites Reis, 1907 (upper Anisian) is based on a single specimen whose phragmocone parameters are close to those of Breviconoteuthis . Fuchs and Donovan (2018) interpreted Zugmontites as a putative phragmoteuthid owing to the absence of a proostracum. Due to the lack of available specimens, it can be presently not excluded that Zugmontites mojsisovicsi Reis, 1907 , the type spieces of Zugmontites , is identical to Breviconoteuthis breviconus . One feature delimiting the two type species might be the ventral curvature that seems to be more distinct in Breviconoteuthis than in Zugmontites .