Stichoporina reussi Stoliczka, 1862

Zágoršek, Kamil & Gordon, Dennis P., 2014, Revision of the Oligocene bryozoan taxa described by Stoliczka (1862), with the description of a new genus of Bryocryptellidae, Geodiversitas 36 (4), pp. 541-564 : 558-561

Stichoporina reussi Stoliczka, 1862 ( Fig. 8 A-G)

Stichoporina reussi Stoliczka, 1862: 93 , pl. 3, fig. 6. — Braga 1980: 62. — Zágoršek 2001: 68, pl. 29, figs 1-3.

MATERIAL EXAMINED. — Nine syntypes, registered as 1862/0022/0046. Ŋe chosen lectotype (designated here) corresponds with Stoliczka’s illustration (1862: pl. 2, fig. 6)

and is depicted as Figure 8A herein. Ŋe species has been illustrated by Gordon on http:// bryozoa.net/ cheilostomata / orbituliporidae /sticreu.html (last access 1 st December 2014).

DESCRIPTION

Colony discoidal, free-living, with a circular central kenozooidal pit on frontal face and having a concave obverse face. Autozooecia oval to regularly hexagonal with convex frontal shield on upper face of colony; hexagonal with a slightly porous basal wall on lower face; aperture more or less central in zooecium, elongate-oval/subpyriform with short condyles sometimes in evidence. In cross section, autozooecia bottle shaped, with slightly curved distal part. Small kenozooecia with tiny central foramen scattered among autozooecia on upper face. Avicularium usually not present.Ooecia situated on margin of colony, globular with imperforate frontal skeletal wall, slightly immersed in distal autozooecia.

REMARKS

Stichoporina reussi Stoliczka, 1862 has no avicularia, whereas Stichoporina simplex Koschinsky, 1885 and Stichoporina protecta Koschinsky, 1885 have them. Stichoporina reussi is the type species of the genus, which has been synonymised by Braga (1980) and many other authors with Stenosipora Canu & Bassler, 1927 (type species Stichoporina protecta ). Stenosipora , however, has avicularia, lacks a central pit and basal kenozooecia, and does not form evenly circular colonies. We accept both genera as valid.

Figures

FIG. 8. — Stichoporina reussi Stoliczka, 1862; A, lectotype colony; B, colony margin showing budding pattern; C, a smaller syntype colony; D, detail of ooecium; E, abfrontal view of colony showing a single pore in zooecial basal wall; F, transverse section of colony showing arrangement of autozooecia in one row with a highly calcified central part; G, section showing internal view of autozooecia. Scale bars: 100 μm.