ctenidium


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Related to ctenidium: ctenidia

ctenidium

[tə′nid·ē·əm]
(invertebrate zoology)
The comb- or featherlike respiratory apparatus of certain mollusks.
A row of spines on the head or thorax of some fleas.
References in periodicals archive ?
Fore coxa with 8-10 brown setulae on anterior surface; hind coxa with lateral black seta; fore tibia with ctenidium of 8 short spinules.
Fore coxa with 22 brown setulae on anterior surface; fore tibia with ctenidium of 10 or 11 short, sharp black spinules.
Fore coxa with 15 brown setulae on anterior surface; fore tibia with 4 strong setae on lateral margin, the second basal seta of similar length to other three, with ctenidium of 13 short, sharp black spinules.
To briefly summarise, features of the African Pacycerina that are immediately striking include: (1) tiny ocellar setulae ('ausserordentlich klein' [extraordinarily small] in Becker's (1895: 250) words), (2) incurved anterior fronto-orbital bristles (reclinate in most Afrotropical lauxaniids, except Chaetolauxania Kertesz), (3) bulging prefrons and lateral black spots (other Afrotropical lauxaniid genera lack such a tumid prefrons and maculation), (4) elongated postpedicel, (5) two acrostrichal bristle rows on mesoscutum, (6) no profemoral ctenidium, (7) usually dark brown protibia and protarsi (relative to yellow meso- and metatibiae and tarsi), (8) the presence of paired black spots on T6 in some species, and (9) the absence of an aedeagus in the male of all species.