n African Entomology - The systematics and biology of the South African gall-inducing scale insect, Brain (Hemiptera : Coccoidea : Eriococcidae)

Volume 14, Issue 1
  • ISSN : 1021-3589



The scale insect genus Brain has a single described species, Brain, which is endemic to southeastern South Africa. Females of induce small, mostly conical galls on the foliage of their host tree, E. Meyer ex Arn. (Icacinaceae), which has a wider, mostly coastal distribution, than that currently known for the scale insect. has been placed in the family Eriococcidae and may be related to the South American genus Lepage. No other native eriococcid species have been described so far in South Africa, although the family is diverse in other Gondwanan regions. This paper summarizes the biology of , redescribes the adult female, describes the adult male, the second-instar female and the first-instar nymphs for the first time, and reconsiders the phylogenetic relationships of the genus. The adult female is shown to have unusual abdominal segmentation, in that segment I is present both dorsally and ventrally, but a segment is absent ventrally on the middle abdomen. First-instar nymphs are sexually dimorphic; males have a larger and relatively narrower body, larger mouthparts, longer antennae and legs, and more thoracic dorsal setae compared with females. Molecular data from nuclear small-subunit ribosomal DNA (18S) and elongation factor 1 alpha () show to have no close relatives among the Eriococcidae sampled to date. Instead, the lineage is part of a polytomy near the base of the Eriococcidae. Molecular dating of the node suggests that the lineage diverged from other eriococcids more than 100 Mya. These data support the placement of as the only genus in the subfamily Calycicoccinae Brain.

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