Ceratotrochus supracretacea Hennig, 1899

Baron-Szabo, Rosemarie C., 2008, Dendrophylliina, Caryophylliina, Fungiina, Microsolenina, and Stylinina, Zootaxa 1952, pp. 1-244 : 69-70

Ceratotrochus supracretacea Hennig, 1899

Text-Fig. 11

*1899 Ceratotrochus supracretacea , n. sp.: Hennig, p. 21, pl. 2, figs 37–40.

1927 Ceratotrochus polonicus n. sp.: Siemiradzki, p. 317, pl. 1, figs 5a–c.

1955 Axocyathus punctatus (de From.) : Rossi Ronchetti, p. 115, pl. 12, figs 1–2.

1987 Ceratotrochus rengarteni Kuzmicheva , sp. nov.: Kuzmicheva, p. 127, pl. 21, figs 6–7.

2000 Ceratotrochus polonicus, Siemiradzki 1927 : Löser, p. 18.

2002 Ceratotrochus polonicus Siemiradzki, 1927 : Baron-Szabo, p. 163.

Dimensions. d= 9–25 mm; s=36–96; h=up to 28 mm.

Description. Trochoid to ceratoid, circular in outline; costosepta thin, developed in 5 cycles in 6 systems in late adult stages; they slightly alternate in thickness, more clearly alternate in length; columella as observed in C. punctatus and C. rengarteni rather small.

Remarks. The species listed in the synonymy list above are believed to form an ontogenetical series in which: 1) the forms assigned to the species C. punctatus from the Maastrichtian of Libya and the species C. mm, number of septa 48 in C. supracretacea ); 2) the species C. rengarteni from the Danian of Turkmenistan, Ukraine, Kazakhstan, and Russia form intermediate stages (d up to 18 mm, s=67–75); 3) the species C. polonicus from the Maastrichtian of Ukraine corresponds to late ontogenetical stages (d= 25 mm, s=96). However, because the ontogenetical stages could not be studied by sectioning the material, the synonymy listed above is only provisional.

Type locality of species. Danian of Denmark .

Distribution. Maastrichtian of Libya, Maastrichtian-Danian of Ukraine, Danian of Denmark, Turkmenistan, Kazakhstan, and Russia.

Text-Fig. 11 Ceratotrochus supracretacea Hennig, 1899 , based on the illustration of the type material in Hennig (1899), Danian of Denmark. A, upper surface longitudinal view, scale bar: 5 mm; B, upper surface cross view, scale bar: 5 mm; C, longitudinal cut, scale bar: 2.5 mm.