Small conical galls on Red Gum Leaves (gall of male Opisthoscelis subrotunda)

male galls of Opisthoscelis subrotunda at Woodlands Historic Park — galls on Red Gum Leaves, caused by a male scale insect. They are about 2mm high. Early Sep.

underside of male galls of Opisthoscelis subrotunda at Woodlands Historic Park — Underside of the leaf. The male gall openings are round or oblong.

Classification

statistics from Australian Faunal Directory

Order Hemiptera - bugs, hoppers and scale insects
Family ERIOCOCCIDAE (175 species in Australia)
Genus Opisthoscelis
Species Opisthoscelis subrotunda

References

Nate B. Hardy, Penny J. Gullan (2010) Australian gall-inducing scale insects on Eucalyptus: revision of Opisthoscelis Schrader (Coccoidea, Eriococcidae) and descriptions of a new genus and nine new species. ZooKeys 58:1-74.