Crustaceans

These usually are chemoreceptive, but may be mechanoreceptive in large groups; they always form in invaginated pockets and may be smooth or denticulate, elongate and stiff, or short and robust.

hyaline lamella

Animals; Crustaceans

Thin, membrane-like crest along certain segments of appendage (e.g., of antennule, pereopod). (broad, narrow, notched, smooth, toothed, triangular).

non-annulate seta, small, non-robust

This may be a heterogenous assemblage with several basic homologies represented and consequently will need re-evaluation; they are usually very small sensory setae found at numerous sites on the body ...

ostia

Animals; Crustaceans

Three pairs of small openings in the heart of a decapod crustaceans; through the ostia, blood enters the heart from the pericardium.

cuticular combs

Animals; Crustaceans

Tiny, arc-shaped or linear groups of cuticular spines, most easily Seen on the distal parts of the mandibular palp. They may occur elsewhere on the cephalic appendages.