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Fig. 16 | Frontiers in Zoology

Fig. 16

From: A microCT-based atlas of the central nervous system and midgut in sea spiders (Pycnogonida) sheds first light on evolutionary trends at the family level

Fig. 16

Central nervous system and midgut layout in various pycnogonid families in relation to external morphology. Schematized ventral views, anterior to the top. The configuration of the cephalic limbs (cheliphore—light red; palp—yellow; oviger—light blue) and the second leg are shown in the left body half. The CNS ganglia (including the anterior brain) are depicted in green and starting from leg ganglion 2, are shown only in the right body half. Nerves are likewise depicted in the right half only, with optic and proboscis nerves completely omitted. The identity of the ganglia can be deduced from the segment and appendage they innervate. The midgut and hindgut are depicted in magenta, the extension of the leg diverticula is exemplarily illustrated in the second leg. A Austrodecidae—A. glaciale. B Rhynchothoracidae—R. australis. C Pycnogonidae—P. litorale. D Colossendeidae—C. angusta (leg 2 shown up to the femur only). E Endeidae—E. spinosa. F Phoxichilidiidae—Ph. femoratum

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