Chaetotaxy


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Chae´to`tax`y


n.1.(Zool.) The arrangement of bristles on an insect.
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Tibiotarsal chaetotaxy formula followed Deharveng (1983) and was expressed as: total number of chaetae (number of chaetae in row C, number of chaetae in row B, number of chaetae in distal rows A), for example 16 (1, 8, 7).
Segments 1-5 strongly sclerotized dorsally, anterotransverse carinae distinct, each prescutum with an additional anterior carina, numerous small sensilla with four longer hair-like sensilla, spiracles near each anterolateral tergal margin; AB6 strongly sclerotized dorsally, laterally, and ventrolateral; ventral membranous area narrow, spiracles opening laterally at or near the dorso-pleural line distant from obscure lateral margin of turgum, carinae and chaetotaxy as on segments 1-5; segment 7 completely sclerotized.
Tibiotarsus chaetotaxy formula follows Deharveng (1983), and is expressed as: total number of chaetae (number of chaetae in row C, number of chaetae in row B, number of chaetae in distal rowA+T), for example 17 (1, 7, 9).
The primary chaetotaxy of legs, last abdominal segment, and cerci is generally consistent with that reported for Rhantus and a related genus, Colymbetes.
Species of this subgenus have reduced chaetotaxy on their first walking legs, which distinctly separates them from members of the subgenus Unionicola and other subgenera.
Other characters, including morphology of the venter and dorsum, varied kinds of sexual dimorphism in the walking legs of the males, chaetotaxy of legs, and morphology of pedipalps, legs and tarsal claws, indicate that six distinctive groups have developed to an extent that named taxa should be erected.
Shape, ornamentation and chaetotaxy of dorsal parts as in female.
The analysis of the primary chaetotaxy of the head and its appendages, legs, last abdominal segment, and urogomphi revealed no major differences between these two species.
Bacillometroides does exhibit a plesiomorphic state for Andersen's Character 3 (body hairs fine and setiform) that does not conform to the typical ground plan for the Hydrometrinae, but it is most parsimonious to conclude that this aspect of chaetotaxy has undergone a reversal of character state.