Dimorpharaea williamsonensis (Wells, 1944)

Dimorpharaea williamsonensis (Wells, 1944)

Fig. 5 1–3 View Fig View Fig

* v 1944 Microsolena williamsonensis Wells , n.sp.: Wells, p. 100, Pl. 20, Figs. 1–4 View Fig

Material FPJ 435; 2 thin sections.

Dimensions (FPJ 435).

Description Tamnasterioid colony with corallites arranged in very irregular rows. Septa regularly perforated. Microstructure of large trabeculae. Septa in cross section equal in thickness throughout the whole septum. No septal symmetry or septal generations. Septa not connected to each other. Septal lateral face with pennulae, inner margin smooth. Pali absent. Costae present, confluent. Synapticulae fairly common. Te columella varies from absent, to substyliform or styliform and thick by septal fusion. Endotheca consists of very few thin tabulae. Budding intracalicinal, polystomodeal and complete. Remarks Although the present specimen has slightly higher septal counts and slightly higher distances of corallite rows, it still compares well to the holotype of Microsolena williamsonensis (NMNH M-547426). Te present specimen also compares well to the corallite dimensions and septal counts given for Dimorpharaea japonica Eguchi, 1951 , but the type of this species seems to be lost; it could not be found in the collections of the Tohoku University Museum in Sendai, Japan (where the collection of Motoki Eguchi is nearly completely stored; Löser et al., 2002) by the first author in 1999 and 2007.

Other material BSPG 2003 XX 6317 (lower upper Aptian from Spain, Cataluña, Montsec de Rubies), ERNO L-4906 (lower Albian of Mexico, Sonora, Cerro de Oro).

Other occurrences Upper Aptian of the Western Tethys ( Spain), Lower Albian of the Western Atlantic ( Mexico), Lower Cenomanian of the Western Atlantic ( USA).