Escharella grotriani ( 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 : 554-555

Escharella grotriani ( Stoliczka, 1862) ( Fig. 6 E-F)

Lepralia grotriani Stoliczka, 1862: 84 , pl. 2, fig. 1. Escharella grotriani – Zágoršek 2001: 51, pl. 17, fig. 8; 2003: 157 (cum syn.).

MATERIAL EXAMINED. — Holotype, registered as 1862/0022/0051.

DIAGNOSIS. — Colony encrusting, the fragment comprising three short rows of autozooecia, these rhomboidal to oval with about 30 very small marginal areolar-septular pores. Frontal shield prominent, convex, smooth or slightly granular, with a small umbo. Aperture oval with a shallow lyrula and usually 5-7 oral-spine bases around periphery. Ooecium small, globular, recumbent on distal zooecium; ooecial aperture not preserved.

REMARKS

Escharella grotriani differs from Escharella tenera (Reuss, 1874) in having a small umbo on the frontal shield, 5-7 oral spines and broad, rhomboidal autozooecia. Zágoršek (2003) presented a detailed discussion of the generic attribution of this species.

Figures

FIG. 6. – A-D, Anarthropora macropora (Stoliczka, 1862), n. comb.; A, general view of lectotype; B, autozooecium showing frontal foramina and suboral avicularium; C, syntype showing quincuncial arrangement of autozooecia; D, frontal-shield foramen showing well-preserved radial denticulation;E, F, Escharella grotriani (Stoliczka,1862);E, lectotype showing arrangement of autozooecia; F, zooecium with ooecium and oral spines; G, H, Myriapora? beyrichi (Stoliczka, 1862), n. comb.; G, lectotype showing smooth outlines of autozooecia; H, detail of aperture with condyles typical of myriaporids; I, J, syntype of Eschara porulosa identified as Tubucella mammillaris (Milne Edwards, 1836); I, general view of chosen lectotype of synonymous Eschara porulosa Stoliczka, 1862; J, lateral view of colony showing autozooecia with large apertures. Scale bars: 100 μm.