Past Palynomorphs of the Month. This is the area of outcropping rocks where the genus was first recovered. The remainder of the vesicle is laevigate. The basal and shoulder spines of Alpenachitina crameri exhibit a conspicuously spongy texture in transmitted light, and in SEM observations of broken spines.
Attachment scars are usually observable when loss of the spines occurs.
This species is restricted to the Middle Devonian - Givetian. Alpenachitina crameri differs in chamber shape from Alpenachitina eisenacki and Alpenachitina ontariensis . Alpenachitina crameri has fewer spines around the basal margin and lower shoulders than has Alpenachitina eisenacki . The neck of Alpenachitina ontariensis is subcylindrical and the aperture fringed with short spines.