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Genus Longicaudus

Rose - buttercup aphids

Species Overview: Genus Longicaudus  Longicaudus trirhodus 

Genus Longicaudus [Macrosiphini]

Apterae are generally small to medium sized and pale coloured. The siphunculi are cone-shaped or cylindrical. With one exception (Longicaudus naumanni) the siphunculi are shorter than the cauda, often much shorter (less than half the length). The siphunculi may be absent in fundatrices. The cauda is finger-shaped or tongue-shaped.

There are eight species in the genus, most host alternating between rose (Rosa) and members of the buttercup family (Ranunculaceae)

 

Longicaudus trirhodus (Rose - columbine aphid)

A pale yellowish-green aphid with slightly darker green transverse bands across the abdomen. The third antennal segment is distinctly longer than the length of the fourth and fifth antennal segments together. The siphunculi are cone-shaped with dark tips and much shorter than the cauda. The cauda is long and finger-like much longer than its basal width. The body length of apterae is 2.0-2.7 mm. The winged form has an irregular black mark on the abdomen.

The rose - columbine aphid host alternates from rose (Rosa spp.) in winter and spring to cultivated columbine (Aquilegia vulgaris) and meadow rue (Thalictrum) in the summer. It is found Europe, Asia and North America.

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).

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.