Aphis maidiradicis Forbes 1891,

Victor, Eastop, F. & Blackman, Roger L., 2005, Some new synonyms in Aphididae (Hemiptera: Sternorrhyncha), Zootaxa 1089, pp. 1-36: 5-7

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http://doi.org/ 10.5281/zenodo.273344

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Aphis maidiradicis Forbes 1891


Aphis maidiradicis Forbes 1891  = Aphis (Protaphis) middletonii  Thomas 1879 Aphis menthaeradicis Cowan 1895  = Aphis (Protaphis) middletonii Thomas 1879 

Colonies of Aphis  ( Protaphis  ) found on roots of various plants in North America are all very similar and the number of taxa involved has always been in doubt (see Palmer 1952). We have done a multivariate analysis of morphometric variation (method of canonical variates) in 7 characters within and between 27 samples of apterous viviparae and 13 samples of alate viviparae from various plants, especially Compositae and Zea mays  , in the BMNH colln ( Fig. 1View FIGURE 1). Samples of both apterae and alatae from Opuntia  in S Africa and Apocynum  in USA had similar scores that discriminated them from all other samples, but apart from this the analysis failed to reveal any clustering of samples which might indicate the existence of more than one taxon, and notably failed to differentiate between samples from Compositae (putative armoraceae) and Zea  (putative maidiradicis  ). This method has proved powerful for discriminating closely­related taxa in other species groups ( Blackman 1992; Blackman & DeBoise 2002), so we conclude that a single name should be applied, the oldest available being A. middletonii Thomas (1879)  .

In the N American literature, populations identified as A. armoraciae  are stated to produce alate males, whereas maidiradicis  and menthaeradicis  have apterous males, and oviparae of menthaeradicis  are said to have very few scent glands on their hind tibiae ( Palmer 1952); however, the criteria for naming these populations are unclear, and experimental work is needed to show whether these differences are of any taxonomic significance.