Passaloteuthis aff. tunezicensis Činčurová, 1989

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 : 20

Passaloteuthis aff. tunezicensis Činčurová, 1989

( Figs. 6F, J ; 7C ; 8A–C )

aff. v 1904 Belemnites elongatus Sowerby; Rzehak, p. 114–115, fig. 3 (Ge 33478; Fig. 6F )

aff. * 1989 Passaloteuthis tunezicensis Činčurová , p. 3–5, text-fig. 1, pl. 1, figs. 1a, b

Material: Five incomplete specimens (Nos. Ge 33478– 82). Maximal preserved length: 112 mm. Maximal diameter: 25 mm.

Description: Very robust, slightly elongated cylindroconical rostrum. Two short and shallow dorsolateral apical depressions developed instead of apical grooves. Cross-section compressed. Te alveolus is eccentric towards the ventral side.

Remarks: Several very robust passaloteuthidid specimens are referred to P. tunezicensis , a taxon established by Činčurová (1989) from the Pliensbachian of Slovakia. Te holotype (and single known specimen) is refigured herein ( Fig. 7C ). We cannot rule out the possibility that P. tunezicensis represents a stout variety of another established taxon belonging to Passaloteuthis , because according to the original description, it shows a single, ventrally (!) placed apical groove. However, our re-examination of the holotype found that this groove is dorsally placed and its atypical nature indicates a pathological development. Such pathological grooves have been previously reported for the genus Passaloteuthis ( Schwegler, 1962: text-fig. 28; Schlegelmich 1998: p. 51). Furthermore, regular apical grooves in Passaloteuthis are typically short and shallow, in contrast to the groove reported on the holotype, which is long and deeply incised and hints at an injury or other pathological features.

Occurrence: Pliensbachian of Slovakia (Činčurová, 1989) and Czech Republic (this study; Western Carpathians).

Figures

Fig. 6 Belemnite rostra of genera Passaloteuthis: A Passaloteuthis armata (Ge 2235a)—1—lateral view, 2—ventral view; B P.armata (Ge 2235b)—1—lateral view, 2—cross-section, 3—ventral view; C Passaloteuthis bisulcata (Ge 33473)—1 lateral view, 2—ventral view; D P.bisulcata (Ge 2235c)—1—lateral view, 2—cross-section, 3—ventral view; E P.bisulcata (Ge 2235d)—1 lateral view,2—ventral view; F Passaloteuthis aff. tunezicensis (Ge 33478)—1—lateral view, 2—cross-section,3—ventral view; G P.bisulcata (Ge 33472)—1—ventro-lateral view, 2—cross-section; H Passaloteuthis cf. P.krimholzi (Ge 33477) lateral view; I P.krimholzi (Ge 33476)—1 lateral view, 2—ventral view; J P. aff. tunezicensis (Ge 33482)—1 cross-section, 2—lateral view (scale bar 20 mm)

Fig. 7 Holotypes of family Passaloteuthididae from SNM defined by Emilia ČinČurová: A Passaloteuthis mezsarosi ČinČurová, 1991 (SNM Z 20 450)—1—lateral view, 2—ventral view, 3—cross-section, 4—dorsal view, 5—lateral view; B Passaloteuthis krimholzi ČinČurová,1974a (SNM Z 6319)—1—lateral view,2—ventral view, 3—cross-section, 4—dorsal view, 5—lateral view; C Passaloteuthis aff. tunezicensis ČinČurová,1989 (SNM Z 20 003)—1—lateral view,2—ventral view, 3—dorsal view, 4—lateral view, 5—detail of the lateral view; D Passaloteuthis andrusovi ČinČurová,1984 (SNM Z 17 991) 1—lateral view, 2—ventral view,3—lateral view. Scale 20 mm

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