Larval morphology of genus Lancetes (Coleoptera: Adephaga: Dytiscidae): the hypothesis of sister-group relationship with the subfamily Dytiscinae revisited

ALARIE Y, ARCHANGELSKY M, NILSSON, AN, WATTS CHS.

CANADIAN ENTOMOLOGIST

ENTOMOL SOC CANADA

Año: 2002 vol. 134 p. 467 - 501

0008-347X

Descriptions of the larvae of Lancetes angusticollis (Curtis), L. lanceolatus(Clark), L. subseriatus Zimmermann, L. flavoscutatus Enderlein, L. delkeskampi m a ,and L. nigriceps (Erichson) are provided. Characters from larval morphology are analyzedto infer the phylogenetic relationships of the genus Luncetes Sharp with othergenera of Dytiscidae. A parsimony analysis based on 51 informative larval characteristicswas conducted with the program NONA. The most parsimonious tree supportsa sister-group relationship between the genus Lancetes and members of thesubfamily Dytiscinae. The only unambiguous synapomorphy in support of this hypothesisis the secondary subdivision of some cephalic appendages. Other putativesynapomorphies are the proximal articulation of the primary seta C07 both onmeso- and meta-coxa and the presence of additional primary setae on the ventralmargin of the tibiae. Based on several character states including the presence ofmultifragmented urogomphi, the genus Luncetes is monophyletic.