| Popis: |
Atetrapachylasma gen. nov. Diagnosis. Wall of female of four plates (Figs 11, 12), compound rostrum (RLRRL), paired compound carinolatals (CL 1 CL 2 s) and carina (C); compound plates apparently without sutural traces in dwarf males as well as females. Wall low conical, wider than high; overall round plan constricted at sutures giving the four parietal parts a somewhat lobed appearance (Figs 5, 11). Opercular plates simple, triangular in outline, articular ridges and furrows weakly developed; tergum without depressor muscles crests; scutum with strong occludent ridge visible externally and internally, adductor pit and ridge absent. Etymology. “A-” not, in preference to “Para-“ beside or near “, since despite also being four-plated and without traces of vestigial sutures, it is otherwise evidently not closely related to the type, Tetrapachylasma trigonum Foster, 1988: 225, much less to Tetrapachylasma s.l. |
