A study of the larva of Carabdytes upin Balke, Hendrich and Wewalka (Cleoptera : Adephaga : Dytiscidae), with comments on the phylogeny of the colymbetinae
Y. Alarie et M. Balke, A study of the larva of Carabdytes upin Balke, Hendrich and Wewalka (Cleoptera : Adephaga : Dytiscidae), with comments on the phylogeny of the colymbetinae, COLEOPTS B, 53(2), 1999, pp. 146-154
Description of structures of the second and third instars of Carabdytes upi
n Balke, Hendrich, and Wewalka are presented, including detailed chaetotaxa
l and porotaxal analyses. Larvae of Carabdytes Balke, Hendrich and Wewalka
are compared phylogenetically with those of other genera of the subfamily C
olymbetinae. Carabdytes belongs to the tribe Colymbetini based on the synap
omorphies of (i) a more distal insertion of the primary seta CO7 on procoxa
, (ii) the presence of marginal basoventral spinulae on tarsal claws, and (
iii) a more distad insertion of the primary pore ANg on antennomere 4. With
in the Colymbetini, Carabdytes is characterized by a fewer number of natato
ry setae which may represent either a plesiomorphic condition or an adaptat
ion to a creeping way of life.