Crioceratites coniferus Busnardo, 2003

Vašíček, Zdeněk, Błażejowski, Błażej, Gaździcki, Andrzej, Król, Maria, Lefeld, Jerzy, Skupien, Petr & Wierzbowski, Andrzej, 2020, Early Cretaceous ammonites and dinoflagellates from the Western Tatra Mountains, Poland, Acta Palaeontologica Polonica 65 (4), pp. 799-810 : 804-806

Crioceratites coniferus Busnardo in Busnardo et al., 2003

Fig. 5A–C .

1996 Crioceratites n. sp. 1; Reboulet 1996: 177, pl. 23: 1, 2, 4, pl. 24: 7.

2003 Crioceratites coniferus n. sp.; Busnardo et al. 2003: 61, pl. 4: 3, 6.

2005 Crioceratites coniferus Busnardo, Charollais, Weidmann, and Clavel, 2003 ; Vašíček 2005: 251, figs. 4.1, 4.2.

2007 Crioceratites coniferus Busnardo ; Klein et al. 2007: 38 (cum syn.).

2013 Crioceratites coniferus Busnardo et al. ; Michalík et al. 2013: 94, fig. 65/4, 5.

Material.—Two large deformed specimens ( GEO.1.2018, Fig. 5A; G /1729/MT, Fig. 5C ), imperfectly preserved mainly in form of imprints. A silicone cast has been made from the GEO.1.2018 ( ZPAL Am. 25/1, Fig. 5B ) favourably showing morphology of the inner whorl, in particular.. All from Cretaceous, Tatra Mountains, Poland.

Description.—Free coiled involute specimens. From the earliest preserved diameter D of about 47 mm (in the axis of elongation), main and accessory ribs are distinct. The main ribs are strong and trituberculated. At first, 2–3 simple ribs are inserted between the pairs of the main ribs. The number of inserted ribs increases up to 4–5. In the ultimate whorl, the silicone cast bears strong umbilical, lateral and ventrolateral tubercles, often connected with spines. In one case, a strong ventrolateral spine with a length of approximately 21 mm is preserved.

Measurements.—In the axis of elongation GEO.1.2018 reaches a diameter of about 123 mm, while G/1729/MT of 150 mm.

Stratigraphic and geographic range.—The holotype originates from the base of Hauterivian in the External Alps of Switzerland. Reboulet (1996) states that the findings from the Vocontian Basin originate from sediments around the Valanginian–Hauterivian boundary. At Butkov, Crioceratites coniferus occurs in the Upper Valanginian ( Criosarasinella furcillata Zone ), as well as in sediments around the Valanginian–Hauterivian boundary ( Vašíček 2005).

Aptychi

Family Lamellaptychidae Měchová, Vašíček, and Houša, 2010

Genus Didayilamellaptychus Turculet, 1994

Type species: Aptychus didayi Coquand, 1841;? Lioux (Basses Alpes), France, Lower Hauterivian, by original designation .

Didayilamellaptychus seranonis ( Coquand, 1841) Fig. 3B .

1841 Aptychus Seranonis (nobis); Coquand 1841: 390, pl. 9: 13.

2010 Didayilamellaptychus seranonis ( Coquand, 1841) ; Měchová et al. 2010: 258, fig. 11B (cum syn.).

Material.—An imprint of a thick­walled, incomplete valve with a slight rest of the original calcite material in the terminal area ( ZPAL Am. 25/12), from Cretaceous, Tatra Mountains, Poland.

Description.—On the flank of the incomplete valve, ribs with inflection are distinct. The ribs are gradually increasing in thickness and running arched towards the symphysal margin. They are connected with this margin as reversely bent toward the non­preserved existing apex of the valve. The incomplete symphysal margin is 19.5 mm long.

Stratigraphic and geographic range.—According to Měchová et al. (2010) D. seranonis occurs in the Western and Central Europe (including the Western Carpathians) in Upper Valanginian to the Lower Hauterivian.

Figures

Fig. 5. The Lower Cretaceous heteromorph ammonite Crioceratites coniferus Busnardo, Charollais, Weidmann, and Clavel, 2003 from the Kościeliska Marl Formation in the Lejowa Valley, Tatra Mountains, Poland. A. GEO.1.2018. B. ZPAL Am. 25/1 (silicone cast). C. G/1729/MT. All in lateral view.

Fig. 3. The Lower Cretaceous ammonites from the Kościeliska Marl Formation in the Lejowa Valley, Tatra Mountains, Poland. A, C–E. Criosarasinella cf. subheterocostata Reboulet, 1996. A. ZPAL Am. 25/19. C. ZPAL Am. 25/7. D. ZPAL Am. 25/17. E. ZPAL Am. 25/14. B. Calcite valve of aptychus Didayilamellaptychus seranonis (Coquand, 1841), ZPAL Am. 25/12. F. Spitidiscus cf. cankovi Vašíček and Michalík, 1986, ZPAL Am. 25/9. G. Olcostephanus densicostatus (Wegner, 1909), ZPAL Am. 25/4.All in lateral view.