The whitefly subfamily Aleurodicinae (Hemiptera: Sternorrhyncha: Aleyrodidae) comprises
20 genera consisting of 138 described species. They are plant feeders and have six
developmental stages. The sessile puparia stage is used to identify whiteflies and can provide
useful host-plant identity. The general aim of this study is to re-define the subfamily
Aleurodicinae by addressing its distribution and phylogenetic relationships.
Approximately 88% of Aleurodicinae species are neotropical, though six genera,
Aleuroctarthrus, Palaealeurodicus, Nipaleyrodes, Pseudosyaleurodicus, Synaleurodicus and
Stenaleyrodes, are mostly distributed in the Australasian region. The separation of Australia
from the Southern Gondwanan land mass may explain the Australasian distribution. Twentyseven
percent of species are polyphagous but few species are recorded in three or more
regions. Aleurodicus dispersus, Paraleyrodes minei and P. bondari are considered invasive
pests. Regional proximity coupled with the anthropogenic effects are the main factors
responsible for the shared species. In general, polyphagous species are more likely to suffer
parasitism and are generally the subject of biological control. Dirphys, a neotropical genus of
aleurodicinae, has potential as a bio-control agent.
Phylogenetic relationships were assessed using 65 DNA sequences derived from
members of nine aleurodicine genera and from 30 adult whitefly species, and puparial
morphological characters were derived from 76% of described aleurodicine species and an
additional nine out-groups. From morphological data, the strict consensus (length 182,
CI=0.189 and RI=0.649) of unweighted most parsimonious trees, Aleurodicinae was
recovered as non-monophyletic with some, mainly Australasian genera, being placed among
the out-group taxa. Under the implied weighting algorithm and with the concavity factor K >
6, Aleurodicinae was, however, monophyletic. A similar relationship occurred with the
molecular analysis in the absence of those Australasian genera. Twelve valid monophyletic
genera were recognized, with Dialeurodicus forming the sister group to the remaining genera.
Three pairs of sister genera were indicated and one pair, Bakerius plus Leornadius was
synonymized. Some intrageneric relationships were supported while some species formed
sibling relationships, for example Aleurodicus pulvinatus, A. cocois and A. juleikae form a
subclade within the genus. Some generic groups need restructuring, for example,
Metaleurodicus
