Fig. 6

Proleymeriella schrammeni, NE-Germany, early Albian, RUB-Pal 11286, a overview of the siphuncle segment with the surface of the siphuncular tube wall and parts of the septum attached, b apertural end of the siphuncle with one main opening (?vein) and a smaller opening (?artery) which may correspond with the smaller opening in c, the other two openings are unclear and could represent two arteries or diagenetic artifacts, c adapertural end with one larger (?vein) and one smaller openings (?artery), v vein, a artery, ts tubular structure, stw siphuncular tube wall