H. armiger at embryonic Stages 10-18. (A) Dorsal view of a five-somite embryo at Stage 10. (B) Dorsal view of a twelve-somite embryo at Stage 10. (C1-4) Stage 11. (D1-6) Stage 14. (E1-6) Stage 17. (F1-6) Stage 18. (C1, D1, E1, F1) Lateral view with dorsal to the right; (C2, D2, E2, F2) Ventral view; (C3, D3, E3, F3) Dorsal view of the head and trunk; (C4, D4, E4, F4) Dorsal view of the trunk and tail; (D5, E5, F5) Close-up for the left forelimb; (D6, E6, F6) Close-up for the left hindlimb. al, allantois; cc, calcar; chp, chiropatagium; crf, cranial flexure; cvf, cervical flexure; h, heart; hp, head process; nf, neural fold; np, nasal pit; nt, neural tube; plp, plagiopatagium; pr, pigmented retina; prp, propatagium; so, somite; tm, thumb; urp, uropatagium. Bar = 1 mm in B, C4, D4, E4, F4 (applies to C1-4, D1-4, E1-4, F1-4), E5-6 and F5-6; bar = 500 μm in A and D5-6.