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Figure 16 | Frontiers in Zoology

Figure 16

From: The embryonic development of the central American wandering spider Cupiennius salei

Figure 16

Stage 20, Ventral closure. All scale bars 200 μm. Sytox staining, a-a'', c, d SEM b. a: Lateral view. Three yolk sacs (YS) are visible in the opisthosomal region. The brain region is fully covered by the prosomal shield (PS). a': Frontal view. The dotted line indicates the advancing edge of the prosomal shield that at this point fully covers the brain region. a'': Dorsal view. As described in the legend for Figure 14, the top of the trapezoid (white dotted lines) spans the narrowing region that will become the petiolus while the base of the trapezoid shows the continuing breadth of the opisthosoma (compare with Figures 14a'', 15a''). b: Fronto-ventral view of the prosoma. c: Ventral view of the prosoma, legs are trimmed. d: Ventral view of the opisthosoma. The prosoma is cut off so the medial growth of the sternites (arrows) can be seen in the process of ventral closure (same embryo as b). AT, anal tubercle; BL, book lung system; Ch, chelicere; H, heart; L1-L4, walking legs 1-4; Lab, labium; Lb, labrum; P, pedipalp; YS, yolk sac.

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