Fig. 8

Proleymeriella schrammeni, NE-Germany, early Albian, RUB-Pal 11285, longitudinal section of the specimen showing the inner structures of the ammonitella. Am ammonitella, ca caecum, ic initial chamber, sp-icw subprismatic initial chamber wall, p-vw prismatic ventral wall of ammonitella, pc primary constriction, pv primary varix; ts tubular structure (most likely the siphuncle), stw = siphuncular tube wall, note: grey scale values inverted