Passaloteuthis bisulcata (Blainville, 1827)

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 : 16-18

Passaloteuthis bisulcata (Blainville, 1827)

( Fig. 6C–E, G )

* 1827 Belemnites bisulcatus Blainville, p. 79, pl. 2, fig. 7

* 1831 Belemnites laevigatus Zieten, p. 29, pl. 21, fig. 12

* 1855 Belemnites cylindricus Simpson, p. 29 (junior subjective synonym) (Doyle, 2003)

v 1904 Belemnites paxillosus Schlotheim ; Rzehak, p. 112–114, fig. 2

1912 Bel . paxillosus Schlotheim Var. C ; Werner, p. 123

1984 Passaloteuthis (Passaloteuthis) paxillosa (sensu Voltz, 1830) ; Riegraf et al., p. 147, pl. 9, figs. 3, 4, text-figs. 43f, 45a, 48a, b (cum. syn.)

1990 Passaloteuthis bisulcata (Blainville) ; Doyle, p. 19, pl. 1, fig. 1–8; pl. 2, figs. 1–4; pl. 3, fig. 1–4 (cum. syn.)

1998 Passaloteuthis bisulcata (Blainville) ; Schlegelmilch, p. 51, pl. 2, figs. 6, 7

1998 Passaloteuthis laevigata (Zieten) ; Schlegelmilch, p. 51, pl. 2, fig. 8

2014 Passaloteuthis laevigata (Zieten) ; Pinard et al., p. 172, fig. 8D

2015 Passaloteuthis bisulcata (Blainville) ; Sanders et al., p. 55, figs. 5B, 7E

v 2015 Passaloteuthis laevigata (Zieten) ; Weis et al., p. 737, figs. 2i–k

v 2018 Passaloteuthis laevigata (Zieten) ; Weis et al., p. 106, fig. 12F, G

v 2021 Passaloteuthis bisulcata (Blainville) ; Rita et al., p. 12, figs. 12A–C.

Material: Four almost complete specimens (Nos. Ge 2235c– d; Ge 33472–73) and numerous fragments. Maximal preserved length: 79 mm. Maximal diameter: 20 mm.

Description: Short but well-developed dorsolateral apical grooves. Irregular striae on the ventral side of the apex. Outline symmetrical and cylindrical, cylindriconical or weakly subhastate. Profile asymmetrical, but otherwise similar to outline. Transverse sections subcircular to subquadrate.

Remarks: P. bisulcata is a morphologically highly variable species and it could be confused with P. milleri ( Phillips, 1867) , which is more cylindrical, with a shorter and less conical apical area. Werner (1912) distinguished three different variants of P. paxillosus . “Var. B” has an obtuse, blunt apex and is larger and more robust than “Var. A” which is commonly cylindrical to slightly subhastate with an acute apex. “Var. C” (sometimes classified as distinct species with the name P. laevigata ) is less robust than the other variant, and generally more conical. Te specimens from Lukoveček mainly fall into this last morphological variant.

Occurrence: Upper Pliensbachian ( Margaritatus Zone ) – Lower Toarcian (Tenuicostatum = Polymorphum Zone) of United Kingdom (Doyle, 1990, 2003), Luxembourg, France, Germany ( Weis et al., 2018), Italy ( Weis et al., 2015), Slovakia (Činčurová, 1971, 1991), Czech Republic (this study; both Western Carpathians), Bulgaria, Spain (Betic) and Morocco ( Sanders et al., 2015; Rita et al., 2021). It has been reported from Moravia already by Rzehak (1904). Widespread Euroboreal and Western Tethys taxon.

Passaloteuthis cf. Passaloteuthis krimholzi Činčurová ,

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)