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Genus Hyalopteroides

Cocksfoot aphids

Species Overview: Genus Hyalopteroides  Hyalopteroides humilis 

Genus Hyalopteroides [Macrosiphini]

Medium sized elongate-oval green aphids, the adult viviparae of which may be winged or wingless. Antennal tubercles are well developed but rather low. The antennae are shorter than the body. The siphunculi are short and cylindrical and the cauda is long, tongue-shaped and blunt.

There is only one species in this genus which is described below.

 

Hyalopteroides humilis (Cocksfoot aphid)

The aptera is medium sized elongate-oval pale green. The dorsal cuticle is rugosely sculptured and is not mealy. Antennal tubercles are well developed but rather low. The antennae are shorter than the body. The siphunculi are very small and thin, with a barely visible apical flange. The cauda is long, tongue-shaped and blunt.

The cocksfoot aphid lives along the midline on the uppersides of leaves of cocksfoot grass (Dactylis glomerata). It does not host alternate and is not attended by ants. The yellowish-brown feeding damage along the midline shown in the picture is characteristic. Males have been recorded, but most populations have probably lost the sexual stage in the life cycle. It is found in Europe east to Russia and in North America.

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Acknowledgements

We have made provisional identifications from high resolution photos of living specimens, along with host plant identity. In the great majority of cases, identifications have been confirmed by microscopic examination of preserved specimens. We have used the keys and species accounts of Blackman & Eastop (1994)  and Blackman & Eastop (2006)  supplemented with Blackman (1974) , Stroyan (1977) , Stroyan (1984) , Blackman & Eastop (1984) , Heie (1980-1995) , Dixon & Thieme (2007)  and Blackman (2010) . We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or information are ours alone, and we would be very grateful for any corrections. For assistance on the terms used for aphid morphology we suggest the figure  provided by Blackman & Eastop (2006).

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References

  •  Blackman, R.L. & Eastop, V.F. (2006). Aphids on the world's herbaceous plants and shrubs. Vols 1 and 2. John Wiley & Sons.