Passaloteuthis armata (Dumortier, 1869)

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

Passaloteuthis armata (Dumortier, 1869)

( Fig. 6A, B )

* 1869 Belemnites armatus Dumortier , p. 40, pl. 1, fig. 13–16

1920 Holcoteuthis armata (Dumortier) ; Bülow-Trummer, p. 82

* 1974 Belemnites armatus armatus, Schumann , p. 26, pl. 4, figs. 1, 2, 7, 8

1991 Passaloteuthis armatus (Dumortier) ; Činčurová, p. 3–4, text fig. 1, pl. 1, figs. 1a, b

2007 Passaloteuthis armata, Rulleau , pl. 41 fig. 9

2018 Passaloteuthis armata (Dumortier) ; Weis et al., p. 104, fig. 11 h–11j

Material: Two almost complete specimens (Nos. Ge 2235a–b). Maximal preserved length: 89 mm. Maximal diameter: 16 mm.

Description: Medium-sized, cylindrical rostrum, with a short apical region. Short and weakly developed dorsolateral apical grooves. Lateral lines developed as two shallow depressions.

Remarks: Te studied specimens match the description and illustration of Dumortier (1869).

Te overall shape of the described species is close to Passaloteuthis elegans ( Phillips, 1835) , whose prominent cylindrical rostrum is sharper posteriorly, accentuating the apical area and ending in an acute apex. Passaloteuthis armata has a conical rostrum with an indistinct apical part, ending in an acute apex.

Occurrence: Euroboreal species with an overlap to Western Tethys, preserved in the Pliensbachian of France ( Weis et al., 2018), Germany ( Schumann, 1974), Slovakia (Činčurová, 1991) and Czech Republic (this study; both Western Carpathians), Bulgaria ( Stoyanova-Vergilova, 1993); and possibly also in Dorset ( United Kingdom). In Normandy ( France; Weiss et al., 2018) it ranges from the Jamesoni up to the Margaritatus zones.

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)