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Calaphis magnoliae

Dark-veined magnolia aphid

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

Identification & Distribution

All adult viviparae of Calaphis magnoliae are alate. The adult vivipara (see picture below) has the head and abdomen pale straw-yellow, with an orange yellow thorax. The hairs on the head and thorax are quite long, but are shorter on the abdomen. The antennal tubercles are low. Their antennae are very long and mostly pale, but with black areas near the middle and apex of antennal segment III (cf. Calaphis magnolicolens, which has segment III only gradually darkening distally). In addition, the bases and apices of segments IV and V, and all of segment VI except the base are dark. The terminal process is about 5.3 times as long as the base of segment VI. The secondary rhinaria on antennal segment III are circular or oval, arranged in a row with 3 or 4 in the pale basal region, and 5-9 in the dark area; there are also a few rhinaria on antennal segments V and VI.

Image above by permission, copyright Akihide Koguchi, all rights reserved.

The forewing veins of Calaphis magnoliae are heavily bordered with fuscous, especially distally (cf. Calaphis magnolicolens, which does not have the forewing veins bordered with fuscous). The stigma is very pale with a black tip, and there is no radial sector vein. The hind wings are pale throughout. The abdomen has five pairs of spinal tubercles which are concolorous with the body (see picture above). The femora are mainly pale, but the bases and distal halves of the tibiae and the tarsi are dusky or dark. The siphunculi are small pale truncate cones. The cauda is knobbed, and the anal plate is bilobed. The body length of alate Calaphis magnoliae viviparae is 1.4-2.2 mm.

Calaphis magnoliae feeds on the leaves of kobushi magnolia (Magnolia kobus) and black lily magnolia (Magnolia liliflora). The life cycle is assumed to be monoecious holocyclic, but sexual morphs are so far undescribed. The dark-veined magnolia aphid is found in Japan and Korea.

 

Other aphids on the same host

Calaphis magnoliae has been recorded on 2 species of magnolia (Magnolia kobus, Magnolia liliflora).

Acknowledgements

We are especially grateful to Akihide Koguchi allowing us to reproduce the image of Calaphis magnoliae from his blog page.

Identifications were made from very high resolution photos of living specimens on host plants of known identity. We have used the keys and species accounts of Essig & Kuwana (1918) along with Blackman & Eastop (1994) and Blackman & Eastop (2006). We fully acknowledge these authors as the source for the (summarized) taxonomic information we have presented. Any errors in identification or 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).

Useful weblinks

References

  • Essig, E.O. & Kuwana, S.I. (1918). Some Japanese Aphididae. Proceedings of the California Academy of Sciences Series IV. 8(3), 35-112. Full text