Fig. 4From: The gladiuses in coleoid cephalopods: homology, parallelism, or convergence?Multi-laminated ultrastructure of a belemnitid proostracum (a), octobrachian gladius (b), and a Recent decabrachian gladius (c). a Pachyteuthis sp., Belemnitina, Bathonian, Saratov, Russia; scale bar 100 µm. b Teudopsis buneli, Teudopseina, Toarcian, Luxembourg, scale bar 200 µm. c Todarodes pacificus, Ommastrephidae, Oegopsida, Japan, scale bar 10 µmBack to article page