Atalantria sp. A

(Fig. 12O)

OCCURRENCE. — Lower Jurassic, lower Sinemurian of Mersin Mélange, NW of Mersin city, southern Turkey.

DESCRIPTION

Test multicyrtid, increasing in width distally except the last segment. Last segment decreasing in width. Cephalis hemisphaerical, poreless with small, rudimentary, needle-like horn. Thorax to rest of segments, except the last one, subtrapezoidal. Last segment inverse subtrapezoidal in outline. Segments have two transverse rows of pores with hexagonal pore frames.

REMARKS

This specimen differs from Atalantria emmela (Cordey & Carter 1996: 67, pl. 24, fig. 13) by having a distally constricted test. It can be differentiated also from Atalantria epaphrodita (Cordey & Carter 1996: 446, pl. 1, figs 6, 7, 10, 11) by having a shorter test and cephalis with unbranched, needle-like horn.