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Fig. 17 | Frontiers in Zoology

Fig. 17

From: An atlas of larval organogenesis in the European shore crab Carcinus maenas L. (Decapoda, Brachyura, Portunidae)

Fig. 17

Frontal histological sections of Zoea IV (Holländer stain). a - section through the distal part of the digestive gland (DG) with the two posterior lobes flanking the hindgut (HG), see Fig. 2c for section plane. b - section showing the posterior artery (PA) as well as the descending artery (DA). c - section through the first pleon segment with the hindgut (HG) and its blindly ending posterior caecum (PoC) as well as pereiopod anlagen (P). d - higher magnification of the ventral nerve cord (VNC), penetrated by the descending artery (DA). e - higher magnification of the first pleon segment shown in B, the flexor muscles (VFM) and extensor muscles (DEM) of the pleon are identified. f - higher magnification of the ventral nerve cord (VNC) as it is penetrated by the descending artery (DA). g - undifferentiated tissue of pereiopod (P) and gill anlagen (Gi) surrounded by the lateral branchiostegites; h - close-up of undifferentiated tissue of a pereiopod anlage. Abbreviations: Bst - epithelium of branchiostegite, DA - descending artery, DEM - extensor muscle, DG - digestive gland, Gi - gill, H - heart, HG - hindgut, Mxp1 - first maxilliped, Mxp2 - second maxilliped, P - pereiopod anlagen 1 - 5, PA - posterior artery, PoC - posterior caecum, TG – thoracic ganglia, VFM - flexor muscle, VNC - ventral nerve cord

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