Amaltheus margaritatus de Montfort, 1808

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 : 8-10

Amaltheus margaritatus de Montfort, 1808

( Fig. 3C )

*1808 Amaltheus margaritatus de Montfort , p. 90, fig. 91

1955 Amaltheus sp. indet. Sato, p. 114, pl. 18, figs. 1, 2

1958 Amaltheus margaritatus de Montfort ; Howarth, p. 13, text–fig. 8 (neotype), 9 (lectotype), pl. 3, figs. 4–6, with synonymy

1964 Amaltheus stokesi (Sowerby) ; Frebold, pl. 6, fig. 7

1974 Amaltheus margaritatus de Montfort ; Elmi et al., pl. 1, fig. 1

1976 Amaltheus margaritatus de Montfort ; Pourmotamed & Motamed, fig. 3

? 1978 Amaltheus gr. margaritatus Montfort ; Faugères, pl. 41, fig. 4

1980 Amaltheus margaritatus Montfort ; Sey & Kalacheva, pl. 1, figs. 5, 9, 10, 12

1986 Amaltheus aff. margaritatus de Montfort ; Ouahhabi, pl. 7, figs. 5, 13, pl. 9, fig. 6

1986 Amaltheus margaritatus de Montfort ; Meister, pl. 20, fig. 9, pl. 22, fig. 1, pl. 23, fig. 6, with synonymy

1988 Amaltheus margaritatus de Montfort ; Meister, pl. 1, figs. 2–4, pl. 2, figs. 1–3, 5, pl. 3, figs. 3–5, 10, pl. 4, figs. 1, 3, 4

1988 Amaltheus (Amaltheus) margaritatus (Montf.) ; Krymholts, Mesezhnikov, and Westermann, pl. 2, fig. 5 only

? 1991 Amaltheus stokesi (J. Sowerby) ; Poulton, p. 18, pl. 8, fig. 1

1991 Amaltheus margaritatus de Montfort ; Blau & Meister, pl. 5, fig. 10

1992 Amaltheus (Amaltheus) margaritatus (Montf.) ; Westermann, pl. 17, fig. 6 only

1994 Amaltheus margaritatus de Montfort ; Fischer, pl. 27, fig. 1

1995 Amaltheus margaritatus de Montfort ; Dommergues et al., pl. 9, fig. 5

1996 Amaltheus margaritatus de Montfort ; Popa & Patrulius, pl. 2, fig. 7, pl. 3, fig. 1, 3

1997 Amaltheus stokesi (Sowerby) ; Johannson, Smith, and Gordey, pl. 2, fig. 12

1997 Amaltheus margaritatus de Montfort ; Dommergues et al., pl. 8, fig. 14

1998 Amaltheus margaritatus de Montfort ; Géczy and Meister, p. 103, with synonymy

? 2002 Amaltheus margaritatus de Montfort ; Rakús & Guex, pl. 27, fig. 8

2002 Amaltheus margaritatus de Montfort ; Fauré, pl. 7, fig. 16

2003 Amaltheus margaritatus de Montfort ; Meister & Friebe, p. 49

2004 Amaltheus margaritatus (Montfort) ; Morard, pl. 2, fig. 4–6

2006 Amaltheus margaritatus Montf. ; Topchishvili et al., pl. 11, figs. 1, 2

2006 Amaltheus margaritatus de Montfort ; Fauré, fig. 7.15–16, fig. 8.1–4

2007 Amaltheus margaritatus (de Montfort) ; Rulleau, Guiffray, and Dommergues, pl. 35, figs. 3–5

2007 Amaltheus margaritatus de Montfort ; Mouterde et al., pl. 2, figs. 1, 3, 8, with synonymy

2007 Amaltheus margaritatus de Montfort ; Schubert, p. 15, fig. 4

2008b Amaltheus margaritatus Montfort form margaritatus Montfort ; Dommergues et al., pl. 10, fig. 4

2008 Amaltheus margaritatus de Montfort ; Seyed-Emami et al., p. 244, 246, fig. 4C, G, T only

2011 Amaltheus margaritatus de Montfort ; Shirmohammad et al., pl. 1, fig. 15

2011 Amaltheus margaritatus de Montfort form margaritatus de Montfort ; Nakada, p. 103, pl. 1, figs. 9–10, pl. 4, figs. 7–16

2013 Amaltheus margaritatus Montfort ; Bardin et al., fig. 4A–B, fig. 5A–B, E–F, fig. 6F, G

2014 Amaltheus margaritatus de Montfort ; Schubert, pl. 1, fig. 5

2016 A. margaritatus de Montfort ; Comas-Rengifo et al., fig. 3.2.

2017 Amaltheus gr. margaritatus Montfort ; Dommergues & Meister, p. 302, fig. 175

2018 Amaltheus margaritatus (de Montfort) ; van de Schootbrugge et al., 2018, pl. 3, figs. 27, 28, 34

2019 Amaltheus margaritatus de Montfort ; Fauré & Teodori, pl. 23, fig. 8

2020–2021 Amaltheus margaritatus de Montfort ; Fauré, pl. 4, fig. 13

2021 Amaltheus margaritatus de Montfort ; Nakada et al., p. 1011, figs. 5, 6.1–6.6

? 2022 Amaltheus ex. gr. margaritatus Montfort ; Hostettler et al., pl. 4, fig. 2

2023 Amaltheus margaritatus Montfort ; Bohain et al., pl. 13, figs. 1–2

2023 Amaltheus margaritatus de Montfort ; Meyer, pl. 3, fig. G

2025 accepted A. (Amaltheus) margaritatus form margaritatus Montfort ; Meister et al., pl. 80, figs. 2–3, 5–10, pl. 81, figs. 1, 6–7, 10–11, 15–16, 18, 23, pl. 82, figs. 1–7

Material: One fragment and one imprint (Ge 33503).

Description: Tis species is represented by oxycone compressed forms with a narrow umbilicus, high-oval whorl section, well-developed crenulated keel and almost angular umbilical edge. Ribbing is relatively weak, ribs are radial to slightly sigmoidal (a feature which is observable on the imprint), projected strongly adoraly in the latero-ventral area, not bifurcating, becoming reduced in strength, continuing until the crenulated keel. No tubercles or spines. Crenulation is fine on the inner whorls but becomes stronger on the outer ones.

Occurrence: Tis species is the index taxon of the Margaritatus Zone of the Pliensbachian standard zonation. However, its stratigraphic range is much longer, from the Subnodosus Subzone of the Margaritatus Zone to the top of Solare/ Apyrenum Subzone of the Spinatum Zone (e.g. Meister, 1988). It is widely distributed mainly in the Euroboreal and Boreal domains (Northwest Europe, West Asia, Japan, British Columbia and East Russia), it is known also from Western Tethys (Austroalpine in Austria and Hungary, Carpathians in Slovakia, Ukraine and the Czech Republic, Caucasus, Bulgaria, Iran). More scarcely, it has been documented in the Mediterranean Tethys in Southern Alps, Sicily, Algeria, Tunisia, Morocco and Spain.

Figures

Fig. 3 Ammonites from the Upper Pliensbachian of LukoveČek: A Phylloceras gr.frondosum – hebertinum (Ge 33499); B Juraphyllites libertus (Ge 33500); C Amaltheus margaritatus (Ge 33503); D–E Amaltheus stokesi (Ge 33501); F Pleuroceras aff. gr. solare (Ge 33504); G, J–K Pleuroceras gr.solare (Ge 33505–33507); H, L–M Pleuroceras cf. quadratum (Ge 33508, Ge 33509); I P.solare var.trapezoidiforme (Ge 33510); N–O Pleuroceras sp. nov. aff. spinatum (Ge 33511). Scale 10 mm