Figure 2
From: Ontogeny of the digestive system of the Octopus bimaculatus paralarvae (Verril, 1883)
Longitudinal cuts of O. bimaculatus eggs. A, embryo of 20 DPL, with extended blastodermeres towards the anterior part of the egg on the yolk surface. B, embryo of 30 DPL, with early mantle, eyes and arms differentiation. C, ectodermal stomodeum in the anterior part of an embryo at 33 DPL. D, outlines of the internal organs of an embryo at 37 DPL. E, embryo at 39 DPL, section of the internal cavity of the mantle. F, embryo at 44 DPL, buccal mass. G and H, embryo of 55 DAL anterior and posterior sections respectively. Arteta trichromic stain. A, arm; ASG, anterior salivary gland; BrH, branchial heart; BM, buccal mass; C, caecum; DG, digestive gland; EE, ectodermal stomodeum; G, gills; H, head; I, intestine; IBL, invagination of the blastoderm; M, mantle; Ma, mandible; OP, ocular peduncle; OV, optical vesicle; PSG, posterior salivary gland; R, radula; St, stomach; Y, yolk.