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Calaphidinae : Panaphidini : Mesocallis sawashibae
 

 

Mesocallis sawashibae

Pale-fronted hazel aphid

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

Identification & Distribution

Adult viviparae of Mesocallis sawashibae are apterous or alate, but the alate appears to be much the commoner morph, so we focus on that for identification. Alatae are mostly pale yellow with the front of the head and the metathorax very pale brown (cf. Mesocallis pteleae, which has the front of the head black). Only the distal parts of antennal segments III-VI are dark (cf. Mesocallis pteleae, which has all of segment III dark). The compound eyes are red. The legs are pale, apart from the distal parts of the mid- & hind tibiae which are pale brown, and the distal parts of the front tibiae which are usually dark (but note the distal parts of the front tibiae are pale in the spring form and in the apterous morph). The antennae are 0.64-0.76 times the body length with the terminal process 0.80-1.25 times the length of antennal segment VI. Antennal segment III bears 6-12 transversely elliptical secondary rhinaria in a row on two thirds of the segment, with no secondary rhinaria on antennal segment IV. The rostrum is rather short, not reaching to middle coxae. The apical rostral segment (RIV+V) is 0.67-1.00 times the length of the second hind tarsal segment (HTII) (cf. Mesocallis pteleae, which has RIV+V 1.2-1.4 times the length of HTII). The fore-coxae are weakly enlarged. Vein Cu1b of the forewing is slightly dark bordered (cf. Mesocallis pteleae, which has Cu1b broadly dark-bordered). Abdominal segments I-IV have short cone-shaped marginal tubercles each bearing a single hair. The siphunculi are cylindrical truncated, the cauda is knobbed with 11-13 hairs, and the anal plate is bilobed.

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

Mesocallis sawashibae feeds on trees in the birch family (Betulaceae), specifically hornbeams (Carpinus) and hazels (Corylus). It is commonly found on Carpinus cordata, japanese hornbeam (Carpinus japonica), the asian hazel (Corylus heterophylla) and japanese hazelnut (Corylus mandshurica). The specimens reported here from Japan were found on Corylus. Mesocallis sawashibae is monoecious holocyclic, with oviparae having been found in Japan in October. This species is known from China, Japan, East Siberia, and Korea (North and South).

 

Other aphids on the same host

Mesocallis sawashibaehas been recorded on 5 species of hornbeam (Carpinus cordata, Carpinus coreana, Carpinus erosa, Carpinus japonica, Carpinus laxiflora).

Mesocallis sawashibaehas been recorded on 1 species of hazel (Corylus mandshurica).

Acknowledgements

We are especially grateful to Akihide Koguchi for allowing us to reproduce the image of Mesocallis sawashibae from his blog page.

Identification of the specimens in Japan was carried out by Daisuke (@ enyomorihio). We have used the keys and species accounts of Matsumura (1918) , Higuchi (1972) , Quednau (2003), Lee et al. (2018) & Chen et al. (2020) together with information from Roger Blackman & Victor Eastop in Aphids on Worlds Plants. 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

  • Chen, J. et al. (2020). Review of Mesocallis Matsumura from China (Hemiptera, Aphididae), with one new species. ZooKeys 1003, 19-30. Full text

  • Higuchi, H. (1972). A taxonomic study of the subfamily Callipterinae in Japan (Homoptera:Aphididae). Insecta Matsumurana 35, 19-126. Full text

  • Lee, Y. et al. (2018). The Mesocallis Matsumura (Hemiptera: Aphididae) of the Korean Peninsula with descriptions of two new species. Zoological Studies 57(17), 8. Full text

  • Matsumura, S. (1917). A list of the Aphididae of Japan, with description of new species and genera. Journal of the College of Agriculture, Tohoku Imperial University 7(6), 351-414 (p. 374). Full text

  • Quednau, F.W. (2003). Atlas of the Drepanosiphine Aphids of the World. Memoirs of the American Entomological Institute 72, 20.