InfluentialPoints.com
Biology, images, analysis, design...
Aphids Find them How to ID AphidBlog
"It has long been an axiom of mine that the little things are infinitely the most important" (Sherlock Holmes)

 

 

Genus Hyalopteroides

Cocksfoot aphids

On this page: Genus Hyalopteroides Hyalopteroides humilis

Genus Hyalopteroides [Macrosiphini]

Hyalopteroides are medium sized elongate-oval green aphids, the adult viviparae of which may be winged or wingless. Their 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 the Hyalopteroides genus, which is described below.

 

Hyalopteroides humilis (Cocksfoot aphid)

The adult aptera (see first picture below) of Hyalopteroides humilis is medium sized elongate-oval pale yellowish green. The dorsal cuticle is rugosely sculptured and is not mealy. The antennae are shorter than the body. Antennal tubercles are well developed but rather low and have a small pointed process on the inner side of each of them, projecting forwards, with a hair on top of it. The median frontal tubercle is flat. The siphunculi are very small and thin, about 0.3-0.4 times the length of the cauda, with a barely visible apical flange. The cauda is long, tongue-shaped and blunt.

The alate Hyalopteroides humilis (see second picture above on grass blade with adult aptera) is also pale yellowish green with no abdominal markings. The head, antennae, legs, siphunculi and cauda are darker than in the aptera, and the wing veins are weakly brown-bordered.

The cocksfoot aphid (Hyalopteroides humilis) lives along the midline on the uppersides of leaves of cocksfoot grass (Dactylis glomerata). There is no host alternation and the aphid 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. Hyalopteroides humilis is found in Europe east to Russia and in North America.

Read more...

Acknowledgements

Whilst we make every effort to ensure that identifications are correct, we cannot absolutely warranty their accuracy. We have mostly made 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).

Useful weblinks

References

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