Bairstowius sp.

Geist, Jan, Weis, Robert, Schlögl, Ján, Košťák, Martin & Mazuch, Martin, 2025, Olistoliths as overlooked sources of information: an example from Pliensbachian belemnites and ammonites of Lukoveček (Czechia, Western Carpathians), Swiss Journal of Palaeontology (24) 144 (1), pp. 1-31 : 22

Bairstowius sp. indet

( Fig. 8E )

Material: One fragmentary alveolar part (Ge 33497) within the original matrix with other rostra (referred herein to Passaloteuthis . sp. indet.). Preserved length: 38 mm. Maximal diameter: 6.5 mm.

Description: Slender, elongate rostrum with wellmarked, shallow lateral depressions in the alveolar part. Shallow alveolus without visible eccentricity, (sub-pyriform) compressed cross-section.

Remarks: Tis single specimen with only the alveolar part preserved bears some resemblance with specimens of B. amaliae from the Northwest European Province, from the Upper Pliensbachian of Portugal ( Rita et al., 2021). Te rostrum is elongate with an asymmetrical and hastate profile, and a subhastate to cylindrical symmetrical outline. Te cross section is compressed. Ventrolateral line(s) are markedly developed on the alveolar region.

Figures

Fig. 8 Belemnite rostra of genera Passaloteuthis, Pseudohastites and Barstowius: A Passaloteuthis aff. tunezicensis (Ge 33481)—lateral view, specimen in situ source rock; B P. aff. tunezicensis (Ge 33480)—longitudinal section, specimen in situ source rock; C P. aff. tunezicensis (Ge 33479)—ventral view, specimen in situ source rock; D Pseudohastites sp. indet (Ge 33495)—1—lateral view,2—cross-section, 3—ventral view, specimen in situ source rock; E Bairstowius sp. indet (Ge 33497)—1—lateral view, 2—cross-section, specimen in situ source rock. Scale 20 mm