Dimorpharaea ornata (Koby, 1887)

Dimorpharaea ornata (Koby, 1887)

Fig. 4 4–6 View Fig View Fig View Fig

* v 1887 Microsolena ornata : Koby, p. 399, Pl. 107, Figs. 1–2 View Fig

v 1997 Eocomoseris raueni Löser, 1993 : Baron-Szabo, p. 84, Pl. 14, Fig. 5 View Fig , Pl. 15, Figs. 1 View Fig , 2, 4 View Fig

v 2013 Dimorpharaea sp. 1 : Löser, p. 28, Figs. 8 View Fig kl

Material FPJ 375; 2 thin sections.

Dimensions (FPJ 375).

Description Tamnasterioid colony with corallites arranged in irregular rows. Septa regularly perforated. Microstructure of large trabeculae. Septa in cross section equal in thickness throughout the whole septum. No septal symmetry or generations. Septa not connected to each other, but some may be connected to the columella. Septal lateral face with pennulae. Pali absent. Costae present, confluent. Synapticulae not very common, mainly in the space between the corallites. Columella styliform and rather large. Endotheca absent. Budding intracalicinal, polystomodeal and complete.

Remarks Te present specimen compares well in the distance between corallite rows and the septal counts to the (only illustrated) syntype of Microsolena ornata Koby, 1887 (MGL GEOLREG 4044). Dimorphastrea deickei Bölsche, 1877 , Tamnasteria fromenteli Tomes, 1878 , and Microsolena roemeri Bölsche, 1866 have comparable dimensions but much higher septal counts. Other material BSGP 2003 XX 5804 (Lower Aptian from Greece, Viotía, Levadia).

Other occurrences Callovian to Lower Aptian of the Central Tethys ( Switzerland, Germany), Lower Aptian of the Central Tethys ( Greece), Aptian to Lower Albian of the Western Atlantic ( Mexico) and the Western Tethys ( France).

Dimorpharaea sp.

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Material FPJ 454; 2 thin sections.

Dimensions (FPJ 454).

Description Tamnasterioid colony with corallites arranged in irregular rows. Septa very low in number and regularly perforated. Microstructure of large trabeculae. Te thickness of septa in cross section does not vary throughout the whole septum. No septal symmetry or generations. Septa not connected to each other, but in places connected to the columella. Septal lateral face with pennulae. Pali absent. Synapticulae not very common, mainly in the space between the corallites. Columella styliform, but very small. Endotheca with few thin tabulae. Budding intracalicinal, polystomodeal and complete.

Remarks Te present specimen cannot be compared to available type data. It compares to the Early Cretaceous D. williamsonensis Wells, 1944 , but still has a lower number of septa. Morphometric data for D. williamsonensis Wells, 1944 , as obtained from the holotype NMNH M-547426, are as follows: crd, 3.2–3.8; septa 16–26. Tese values are minimum–maximum values because the thin section from the holotype is very small and yielded only a few values.

Dimorpharaea cf. tosaensis Eguchi, 1951

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Material FPJ 377; 2 thin sections.

Dimensions (FPJ 377).

Description Tamnasterioid colony with corallites arranged in rows with a large distance between them. Te rows are regular. Septa regularly perforated. Microstructure of large trabeculae. Septa in cross section equal in thickness throughout the whole septum. No septal symmetry or generations. Septa not connected to each other. Septal lateral face with pennulae. Pali absent. Synapticulae uncommon. Columella substyliform and small. Endotheca consists of thin tabulae. Budding intracalicinal, polystomodeal and complete.

Remarks Te holotype of Dimorpharaea tosaensis (TUM 65362) has slightly larger dimensions and a higher number of septa: crd 11–12; cdw, 6; septa, 26–30. Tese values are minimum–maximum values because the thin section is very small and yielded only a few values.

Other material BSPG 2003 XX 5489 (Lower Aptian from Greece, Viotía, Arachova).

Other occurrences Aptian of the Central Tethys ( Greece).