Cladistics of the New World Genera of Listroderina (Coleoptera: Curculionidae: Rhytirrhinini).

Abstract

The weevil subtribe Listroderina belongs in the tribe Rhytirrhinini (subfamily Cyclominae), and has 25 genera and 300 species in the Americas. A cladistic analysis of the American genera was undertaken, using 53 characters from the external morphology, mouthparts, body vestiture, and male and female genitalia, and considering Rhigopsidius Heller (subtribe Rhytirrhinina) as the outgroup. The analysis yielded 20 equally parsimonious cladograms (108 steps, CI=0.42, RI=0.64), which after successive weighting resulted in three minimum-length cladograms (256 steps, CI=0.67, RI=0.82). In the strict consensus cladogram, which has the same topology as one of the original cladograms, the genera follow the sequence (Philippius, (Trachodema, (Lamiarhinus, (Acrorius, (Acroriellus, ((Rupanius, (Adioristidius, Amathynetoides, (Puranius, (Macrostyphlus, Andesianellus)))), (Hyperoides, (Germainiellus, (Antarctobius, Nacodius)), ((Haversiella, (Listronotus, Neopachytychius)), (Listroderes, Acrostomus), (Falklandiellus, (Falklandiopsis, (Telurus, (Falklandius, Lanteriella)))))))))))). A phylogenetic classification for the genera of American Listroderina is proposed, where the five principal lineages are recognized as generic groups:Macrostyphlus group (Rupanius, Adioristidius, Amathynetoides, Puranius, Macrostyphlus, and Alndesianellus),Antarctobius group (Germainiellus, Antarctobius, and Nacodius),Listronotus group (Haversiella, Listronotus, and Neopachytychius),Listroderes group (Listroderes and Acrostomus), and Falklandius group (Falklandiellus, Falklandiopsis, Telurus, Falklandius, and Lanteriella).