First record of sexual forms of Aphis craccivora Koch (Hemiptera: Aphididae) on Medicago sativa L. (Fabales: Fabaceae)

We examined 1367 apterous viviparae from 151 samples to study Aphis craccivora, A. tropaeoli and a third, possibly new species in Argentina, resembling both. Principal component analysis (PCA), followed by hierarchical clustering of principal components (HCPC), revealed clusters based on 33 morphological characters of 206 selected specimens. The delimitation of possible taxonomic entities was assessed by logistic regression. PCA confirmed that A. tropaeoli is a valid species. HCPC revealed the existence of a new species distinct from A. craccivora. Recently published data on the variability of A. craccivora, mainly regarding Asian populations, are presented and discussed; the general appearance of the sexuals of this species is also presented. The new species is described with the name Aphis mirabilis Nieto Nafría and Ortego sp. n., based on apterous and alate viviparae, oviparae, and males collected in Mendoza and Neuquén (Argentina) on Adesmia volckmannii (Fabaceae), Atriplex nummularia and At. lampa (Amaranthaceae), Bougainvillea spinosa (Nyctaginaceae), and Robinia pseudoacacia (Fabaceae). This new species has also been collected on plants of another 18 species from 8 additional families, although these specimens are not included in the type series. Features to distinguish A. mirabilis Nieto Nafría and Ortego sp. n. from A. craccivora are presented together with a logistic regression model. The males of A. tropaeoli are described. The list of host plants of A. craccivora in Argentina is updated.

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Aphis mirabilis sp. n. (Hemiptera, Aphididae, Aphidina), a South American species resembling A. craccivora, and further data on A. tropaeoli

Nafra

Moreno-Gonzlez

Ortego

et al. 2022

Zootaxa

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First record of sexual forms of Aphis craccivora Koch (Hemiptera: Aphididae) on Medicago sativa L. (Fabales: Fabaceae)

Abstract: ABSTRACT. Sexual reproduction of Aphis craccivora Koch is recorded for the first time in Semiarid Pampas of Argentina. This type of reproduction was found on Medicago sativa L. A brief description and illustrations of eggs, oviparous females and winged males are given.

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Aphis mirabilis sp. n. (Hemiptera, Aphididae, Aphidina), a South American species resembling A. craccivora, and further data on A. tropaeoli

Aphis mirabilis sp. n. (Hemiptera, Aphididae, Aphidina), a South American species resembling A. craccivora, and further data on A. tropaeoli

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