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Aphidinae : Macrosiphini : Macrosiphoniella sunshine
 

 

Macrosiphoniella sunshine

Oregon sunshine aphid

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

Identification & Distribution

Adult apterae (see first picture below of a fundatrix) of Macrosiphoniella sunshine are light green, with a darker green (i.e. wax free) longitudinal spinal stripe from the mesonotum to abdominal tergite VII, and a darker green patch around each siphuncular base (cf. Macrosiphoniella ludovicianae on Artemisia, where the dorsum appears uniformly green). The antennae are black, and on segment III bear 1253 secondary rhinaria from near the segment base to about its mid-point. The antennal terminal process is 3.235.68 times the base of antennal segment VI. The apical rostral segment (RIV+V) is 1.191.58 times the second hind tarsal segment (HTII) (cf. Macrosiphoniella ludovicianae on Artemisia, which has RIV+V 0.750.94 times HTII). The legs are light greenish brown with darker apices to the femora and tibiae, and dark tarsi. The siphunculi are pale basally and brown to black distally, with distal reticulation over more than one third of their length (cf. Macrosiphum euphorbiae on Eriophyllum, which has distal reticulation over less than one quarter of their length). The siphunculi are 1.101.46 times the caudal length. The cauda is pale and often pointed, with 1526 hairs. The body length of Macrosiphoniella sunshine is about 1.5-2.8 mm.

First image above copyright Andrew Jensen, second image copyright Jim Morefield,
both under a creative common licence.

The alate Macrosiphoniella sunshine is similarly coloured to the aptera, but with a light brown head and thorax. There are 4056 secondary rhinaria on the whole length of antennal segment III, and sometimes 16 rhinaria on segment IV.

Macrosiphoniella sunshine is monoecious holocyclic on the flower stems and leaves of Oregon sunshine (Eriophyllum lanatum, see second picture above). The biology of this aphid is briefly described by Jensen (2020). The fundatrices occur in April (possibly in March in warmer parts of its range) feeding on the overwintered leaves. Aphids then move on to developing flower stems. Alate viviparous females are not common. After flowering, they once again live on the leaves at ground level until sexuales are produced in late fall. Oviparae occur in October, but so far no males have been observed. Macrosiphoniella sunshine occurs in western states of the USA.

 

Other aphids on the same host

Macrosiphoniella sunshine has only been recorded from one Eriophyllum species (Eriophyllum lanatum).

Blackman & Eastop list 3 species of aphid as feeding on Oregon sunshine (Eriophyllum lanatum) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 1 as occurring in Britain (Show British list).

Acknowledgements

We are grateful to Andrew Jensen and Jim Morefield for making their images of the aphid and its host plant respectively available for use under a creative commons licence.

We have used the species account given by Jensen et al. (2020) together with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. We fully acknowledge these authors and those listed in the reference sections 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

  • Jensen, A.S. et al. (2020). A review of the aphid genus Macrosiphoniella del Guercio, 1911 (Hemiptera: Aphididae) in the USA with description of a new species. The European Zoological Journal 87(1), 412-443, Full text