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while in others it is more rounded. Another distinctive feature is the retral processes (small backward extensions of the chamber walls) that cross the...31 KB (2,170 words) - 23:52, 20 October 2022
costulate. The body whorl is wholly devoid of costae but spirally carinate. The retral sinus is relatively large, circularly rounded and close to the suture. The...6 KB (484 words) - 19:23, 9 January 2024
- retral (not comparable) back; posterior Terral
- considerably extended and the five posterior somites are armed with strong angular retral spines. The first segment is anchylosed to the carapace. The telson is very