Aphis prima sp. n. (Hemiptera, Aphididae), from Argentina and Chile, first aphid species worldwide collected on Schoepfiaceae (Santalales)

The study of the first samples of aphids collected on Schoepfiaceae (Santalales) is presented. Aphis prima sp. n. is described from viviparous females collected in the Argentina provinces of Neuquén, Río Negro and Santa Cruz and in Chilean region of Maule on plants of genera Quinchamalium and Arjona, which are endemic to South America. The new species is characterized by the presence of marginal tubercles on 5 or 6 abdominal segments, tibiae homogeneously pigmented and triangular cauda in both apterae and alatae, secondary sensoria on antennal segment III in apterae, and once-branched forewing media in alatae. This last is a very rare characteristic in subfamily Aphidinae.