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Fig. 4. A. aculeatus, scanning electron micrographs. (A) Lateral view,
showing the gland opening (right arrow) and the carapace channel (middle and
left arrows). (B,C) Close-up view of side of animal at base of legs 1 to 3. In
B, the animal is tilted to expose the right-hand ventral surface of the
animal, bringing into view the cleft (arrow) between the coxae of legs 1 and
2, along which the oral effluent is conveyed. In C, the gland opening (arrow)
is shown in relation to the two spines (asterisks) projecting from the coxae
of leg 2 that presumably help direct the oral fluid past the gland opening;
the notch immediately behind the gland opening serves to convey the liquid
onto the carapace channel.
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