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Drepanosiphinae : Drepanosiphini : Drepanaphis monelli
 

 

Drepanaphis monelli

White woolly buckeye aphid

On this page: Identification & Distribution Other aphids on the same host

Identification & Distribution

All adult viviparae of Drepanaphis monelli (see picture below) are alate. They have powdery white wax over the entire body, except parts of the dark fuscous thoracic lobes, the dark siphunculi and the large pair of dark tubercles on abdominal tergite III (cf. Periphyllus aceris & Periphyllus testudinaceus, neither of which have a dorsal abdominal process). They have large, bright red eyes, and there is sometimes a brownish yellow, U-shaped line more or less connecting tergite III to the siphunculi. The antennae have segment I dark, and the others segments pale - except the distal ends of III, IV, V and base of VI which are dark. The terminal process is about 10 times the base of antennal segment VI. Antennal segment III bears 7-25 roundish secondary rhinaria. The rostrum is rather short, not reaching to the mesocoxae. Their wings have slight brown smudges at base of the radius and distal end of the veins. The abdomen is clear with several small, brown, dorsal sclerites, and marginal sclerites on abdominal tergites I-V. The pair of dorsal abdominal tubercles on tergite III are well developed, dark brown, and broadly joined for half their length (see picture below). The tubercles on tergites I and II are small, pale & inconspicuous, whilst those on tergite IV are brown and inconspicuous. The siphunculi are as dark, or darker, than the tubercles on tergite III, and are flask-shaped (conical at base, tubular at top) (cf. Periphyllus aceris & Periphyllus testudinaceus, which both have stump-shaped siphunculi). The body length of adult Drepanaphis monelli viviparae is 1.9-2.3 mm.

Image copyright M.J. Hatfield, under a Creative Commons 3.0 License.

Drepanaphis monelli is monoecious holocyclic on Ohio buckeye (Aesculus glabra). It seems to be most prevalent on yellowed leaves, although whether the aphids cause the yellowing or are attracted to the yellowed leaves is not known - both are likely. Several other species of Drepanaphis are also frequently found on discolored leaves of Acer species. Drepanaphis monelli appears to be generally uncommon, but may be abundant locally. It was described from Missouri by Davis (1909). It is found in northeastern USA from Minnesota to Missouri, across to Connecticut and North Carolina.

 

Other aphids on the same host

Drepanaphis monelli has so far been found on only 1 species of buckeye (Aesculus glabra).

Blackman & Eastop list 3 species of aphid as feeding on Ohio buckeye (Aesculus glabra) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 2 as occurring in Britain (Show British list).

Acknowledgements

We are grateful to M.J. Hatfield for making her images of Drepanaphis monelli available for use under creative commons licences.

Identification was made by D.M. Lagos, PhD candidate, University of Illinois by microscopic examination of preserved specimens. We have used the keys and species accounts of Davis (1909) (as Phymatosiphum monelli) and Smith & Dillery (1968), together with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in 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

  • Davis, J.J. (1909). Two new genera and species of Aphididae. Annals of the Entomological Society of America 2(3), 196-201 (p. 197) Full text

  • Smith, C.F. & Dillery, D.G. (1968). The Genus Drepanaphis Del Guercio (Homoptera: Aphididae). Annals of the Entomological Society of America 61(1), 185-204. Abstract