lunule


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Related to lunule: obdormition

lunule

[′lün‚yül]
(biology)
A crescent-shaped organ, structure, or mark.
References in periodicals archive ?
Head black with grayish microtomentum; orbital plates subglossy blackish brown with microtomentum; ocellar triangle darkish brown without microtomentum; lunule strap-shaped, darkish brown with black margin.
Female: ocellar triangle long and sharpened with a rounded apex reaching the lunule (Fig.
Its main similarity to Protopleurobema is the general shape of the shell, which is markedly trigonal; another shared characteristic is the presence of a wide and easily distinguished lunule. However, the hinge in Pachycardia is less strong and massive.
Small, narrow, elongate, subtrapezoidal shell; anterior margin narrowly convex, extended; dorsal and ventral margins nearly parallel; posterior margin truncate, flatly convex; beaks near anterior end, tightly incurved, prosogyrate; lunule and escutcheon present; umbonal ridge rounded, extending to ventoposterior margin; anterior and ventral area below umbonal ridge with numerous strap-like, comarginal growth ridges having steep edge dorsally; other features not preserved.
formata, in which a dwarf male and a female are coupled and attached to the oral surface of the sand dollar Astriclypeus manni, mostly adjacent to the lunule.
Head black with grayish microtomentum; orbital plates subshiny black without microtomentum; ocellar triangle black without microtomentum; lunule small, yellow with brownish yellow margin.
Head: holoptic, frontal vitta obliterated, chestnut color, widened when reaching the lunule, in the more slender portion with approximately 1/2 diameter of the anterior ocelli; parafrontal and parafacialia yellow with silver tomentum and bare; gena yellow with silver tomentum, postgena and occiput white tomentum, with thin and long hairs; face and clypeal membrane pale; ocellar triangle chestnut; scape, pedicel, flagellomere and palp orange in color.
Examination of the lunule, a heart shaped impression on the external side of the hinge that is anterior to the umbo, was found to be depressed in the three species.
12 Wing with subcosta running in smooth even curve from humeral cross-vein to costa; body colour metallic black or blue; gena with a strong differentiated upcurved seta; [female] ocellar triangle shiny, long or short, almost reaching lunule; [female] frons with one pair of proclinate orbital setae and one pair of inclinate interfrontal setae; 2 species ...
scabrosa of white apical lunule markings with small medial white marks and heavily punctured elytra, flattened white hairs on the underside of the abdomen and numerous conspicuous white hairs on sides of the pronotum (Fig.
For head ratios: the head length and height were measured in lateral view, respectively, from the tip of the frons through the posterior occiput, and from the ocelli through the bottom edge of the subgena; the head width, frons width, and frons length were measured in dorsal view, with head width measured through the widest part, frons width through the anterior ocellus and a second measurement through the top of the lunule, and frons length from the anterior ocellus to the anterior edge of the frons.