FIGURE 5 in Proboscis ornamentation as a diagnostic character for the Anoplodactylus californicus-digitatus complex (Arthropoda: Pycnogonida) with an example from the Anoplodactylus eroticus female

FIGURE 5. Lateral view of the head segment of A. eroticus female, proboscis directed to the right side of the page. A. Brightfield image with Nomarski optics. B. DAPI nuclear stain (originally blue) with a clear differentiation of a noncellular epicuticle. C. Phalloidin (originally green) labeling. Muscle fibres (thin arrow, in A and C) in the protuberances (thick arrow in A and C) extend to the lining of the foregut containing a filtration apparatus, the 'oyster basket', which appears as a dark region within the oesophagus or foregut (A). The epicuticle is perforated by a number of pores, visible dorsally and ventrally on the distal portion of the proboscis (A).