Stylocoeniella hoernesi ( Oppenheim, 1901)

Stylocoeniella hoernesi ( Oppenheim, 1901)

Fig. 10D

v*1901 Astrocoenia Hoernesi n. sp.: Oppenheim, p. 222 ‒ 223, Pl. 17 (7), Fig. 3 ‒ 3a. View Fig

v2009 Actinacis parvistella Oppenheim, 1930 : Khazaei, et al., p. 32, Pl. 2, Fig. 1 ‒ 2 View Fig View Fig [chronotypic material from this area studied].

v2009 Actinastrea ramosa (Sowerby, 1832) : Khazaei, et al., p. 32, Pl. 2, Figs. 3 ‒ 4 View Fig View Fig [chronotypic material from this area studied].

Dimensions. d: 1 ‒ 1.8 mm, up to 2 mm in some places, in areas of intense budding often 0.5 ‒ 0.7 mm; c–c: 1 ‒ 2 mm; s: 12 ‒ 24, often 16 ‒ 20.

Description. Cerioid to cerio-plocoid colony; costosepta thin and rather straight; one or more of S1 fuse with the columella.

Type locality of species. Middle Eocene of Croatia (Dubravica) .

Distribution. Upper Maastrichtian of Iran (Zagros Zone, Tarbur Fm., southwestern Iran; new material this paper), Middle Eocene of Croatia.

New material. 2NG147 (28, 29, 36, 42) (Zagros Zone, Tarbur Fm., southwestern Iran).

Remarks. In the lectotype of Oppenheim’s species hoernesi (UGP 1349) most corallites are in budding stage, having corallite diameters of 2 mm or even larger. However, monocentric corallites often range between 1.2 and 1.5 mm, in areas of intense budding they are around 0.5 mm.

In having (1) cerioid to cerio-plocoid corallites; (2) intra- and extracalicular budding; (3) irregularly occurring pali;

(4) a styliform or short lamellar columella; (5) septoparathecal walls with occasional pores; and (6) intercorallite pillars preserved in some places, the material from the upper Maastrichtian of Iran (Tarbur Fm.) assigned to Actinacis parvistella Oppenheim and Actinastrea ramosa (Sowerby) by Khazaei et al. (2009) corresponds to Stylocoeniella .