Genus Ovatomyzus [Macrosiphini]
A genus of very small fragile pale aphids the adult viviparae of which may be winged or wingless. The characteristics of the genus are intermediate between Ovatus and Myzus The apterae have well developed antennal tubercles with slightly diverging inner margins. The antennae are as long as the body or longer with a very long terminal process. The siphunculi are long, slender, cylindrical or slightly swollen. The cauda is tongue shaped, slightly constricted near the base.
There are 3 species worldwide. Ovatomyzus have lost the sexual stage in their life cycle, and feed all year round on plants in the Lamiaceae and Boraginaceae.
Ovatomyzus boraginacearum (Alkanet aphid)
Apterae of Ovatomyzus boraginacearum are usually whitish to pale greenish yellow, but may be brownish yellow to orange in overwintering populations. Their antennal tubercles are smooth and well developed. The pale antennae are longer than the body, and the terminal process of antennal segment 6 is 1.5-2.3 times the length of antennal segment 3. The pale siphunculi do not have any distinct subapical polygonal reticulation, and are slightly swollen subapically, narrowing to a slight constriction before flange. Ovatomyzus boraginacearum is a very small aphid, with a body length of only 0.9-1.6 mm.
The alkanet aphid lives scattered on the undersides of leaves of its host plants, which are mainly Boraginaceae (Pentaglottis, Anchusa, Pulmonaria, Symphytum), and less commonly Dipsacaceae. Ovatomyzus boraginacearum does not have sexual forms, but has a specialized hibernating apterous morph. It has been found in several European countries including England, Germany and Netherlands, as well as in Iran.
- Blackman, R.L. & Eastop, V.F. (2006). Aphids on the world's herbaceous plants and shrubs. Vols 1 and 2. John Wiley & Sons.