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Cryptomyzus korscheltiWoundwort aphidOn this page: Identification & Distribution Other aphids on the same hostIdentification & Distribution:Cryptomyzus korschelti apterae, on their secondary host, are pale greenish-yellow with a bright green median stripe and further green mottling over the dorsum. The dorsal body hairs are thick and capitate, much longer than the basal diameter of the third antennal segment, and arising from tuberculate bases (cf. Cryptomyzus stachydis where dorsal body hairs are mostly shorter than the basal diameter of the third antennal segment). The siphunculi are distinctly swollen on the distal half, and are 3.1-3.9 times the length of the cauda (cf. Cryptomyzus ribis which has siphunculi 2.3-3.1 times the length of the cauda and Cryptomyzus galeopsidis which has siphunculi 1.1-2.1 times the length of the cauda). The body length of Cryptomyzus korschelti apterae is 1.6-2.9 mm.
Cryptomyzus korschelti alatae (see second picture above) have a large trapezoid dorsal abdominal patch, and have 38-57 secondary rhinaria on antennal segment III, 5-27 on segment IV and 0-14 on segment 5. The micrograph below is a lateral view of an apterous Cryptomyzus korschelti in alcohol.
The clarified slide mounts below are of adult viviparous female Cryptomyzus korschelti : wingless, and winged.
Micrographs of clarified mounts by permission of Roger Blackman, copyright AWP all rights reserved. The woundwort aphid host alternates from alpine currant (Ribes alpinum) to hedge woundwort (Stachys sylvatica). On currant they live beneath red or yellow leaf blister galls. Cryptomyzus korschelti is widespread in Britain and Europe eastward to central Asia. Other aphids on same host:Primary hostsCryptomyzus korschelti has been recorded from at least 16 Ribes species. Blackman & Eastop list 14 species of aphid as feeding on alpine currant (Ribes alpinum) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 12 as occurring in Britain (Show British list).
Secondary hostsCryptomyzus korschelti has been recorded from 7 Stachys species. Blackman & Eastop list 7 species of aphid as feeding on hedge woundwort (Stachys sylvatica) worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists 4 as occurring in Britain (Show British list).
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