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Aphidinae : Macrosiphini : Chaetosiphon hottesi
 

 

Chaetosiphon hottesi

Sticky cinquefoil aphid

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

Identification & Distribution

Adult apterae of Chaetosiphon hottesi are pale whitish-yellow to yellowish-green. The antennal tubercles are about twice the height of the squarish median frontal tubercle. The head is completely smooth, devoid of nodular or granular sculpture (cf. Chaetosiphon fragaefolii on Fragaria & Potentilla, and Chaetosiphon thomasi on Rosa & Potentilla, which have sculpture on the upper surface of the head). Hairs on the dorsum of both the head and body are mostly strongly capitate to globular-tipped. The terminal process is about 3.2 to 4.6 times as long as the base of antennal segment VI. The longest hair on antennal segment III is 0.57-1.15 times as long as that segment's basal diameter. Secondary rhinaria are absent. The rostrum reaches the middle coxae, with the apical rostral segment 1.2-1.5 times as long as the second hind tarsal segment, and has 10-14 subsidiary hairs (cf. Chaetosiphon fragaefolii & Chaetosiphon. thomasi, which have 3-6 accessory hairs). The dorsal body cuticle is rather strongly rugose, but not pitted. Marginal tubercles on the pronotum and tergites II-V are very inconspicuous. Tarsal segment I on all legs has 5 hairs. Siphunculi are straight, slightly tapering on the basal half, then more or less cylindrical to the apex, with a distinct flange. The cauda is tapering, with or without a slight constriction, and with a rather acute apex, and 5-6 hairs. The body length of adult Chaetosiphon hottesi apterae is 1.9-2.1 mm.

Images above copyright Andrew Jensen, under a creative commons licence.

Alatae of Chaetosiphon hottesi (not pictured) have secondary rhinaria distributed 38-39 on segment III, 0-8 on segment IV, and none on segment V. The abdomen has dorsal pigmentation limited to broken or irregular dusky sclerotic bars across the spine of tergites III-V inclusive, not fused into a solid patch, as well as small and rather poorly defined marginal sclerites on tergites II-V inclusive, and postsiphuncular sclerites. Siphunculi and cauda are dusky.

Chaetosiphon hottesi is monoecious on a few cinquefoil (Potentilla) spp. and rose (Rosa) species. Sexuales have not yet been found but, given that Jensen reports finding fundatrices on rose in Idaho (see AphidTrek), this species presumably goes through the holocycle. Chaetosiphon hottesi is found in western North America, from British Columbia to California.

 

Other aphids on the same host

Chaetosiphon hottesi has been recorded on 1 Rosa species (Rosa woodsi).

Chaetosiphon hottesi has been recorded on 2 Potentilla species (Potentilla glandulosa, Potentilla gracilis).

Acknowledgements

We are grateful to Andrew Jensen for making his images of Chaetosiphon hottesi available for use under a creative commons licence.

We have used the species accounts given by Stroyan (1970) 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).

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References

  • Stroyan, H.L.G. (1970). Three new aphid species from North America. Proceedings of the Royal Entomological Society of London Series B, Taxonomy 39(11), 153-162. (p. 155) Abstract