Biology, images, analysis, design...
|"It has long been an axiom of mine that the little things are infinitely the most important" |
Dreadlocks gall aphidOn this page: Identification & Distribution Other aphids on the same host
Identification & Distribution
The fundatrices of Ceratoglyphina roepkei feed on snowbell (Styrax paralleloneurus) inducing remarkable multiple-cavity galls (see pictures below of immature and mature galls). The gall looks like a peruke (= periwig) with long curly frizzy hair as in dreadlocks. Each gall consists of several long, slender, tubular subgalls, 15-20 cm long, their bases radiating from an attachment site on the stem near an axil bud. Each subgall is spirally twisted and has a longitudinal suture running from the base to the apex (cf. galls of Pseudoregma sundanica on Styrax paralleloneurus, which comprise up to seven globular sub-galls joined to a swollen central fundatrix's gall; and cf. galls of Cerataphis vandermeermohri on Styrax paralleloneurus, which consist of bunches of long, thin, dichotomously branched tubes).
Note: In the earlier literature Ceratoglyphina roepkei is referred to as Astegopteryx roepkei.
Images above by permission, copyright Aoki & Kurosu (2010), all rights reserved.
Apterae of Ceratoglyphina roepkei (not pictured) in the gall have a small, broadly oval body with rather long hairs. The antennae have 5 segments, and are without secondary rhinaria. The eyes are comprised of 3 facets. The frons has 2 conical spines. The rostrum reaches to just past the mesocoxae, with the apical rostral segment very acuminate (=tapering to a sharp point). The siphunculi are small, about half as long as wide, and placed on small cones.
The alate of Ceratoglyphina roepkei (not pictured) has a broad head, with very large red eyes. The ocelli are tuberculoid and protruding. The antennae are 0.40-0.44 times the length of the body, they are ringed by very fine spines, and they bear 18-26 secondary rhinaria on segment III, 7-10 on IV and 6-9 on V. The last antennal segment is longer than segment IV (Ceratoglyphina styracicola on Styrax suberifolius which has segment IV longer than V). Fore and midlegs have the first tarsal segment with 4 hairs. The hindleg first tarsal segment has a very short median spine and 2 long hairs. The abdomen has few hairs. Tergites VII & VIII are not thickened or sclerotized, except around hair bases (cf.Pseudoregma sundanica, which has these tergites thickened & sclerotized). The spinal hairs on tergite VIII, and often on VII, are sited on scleroites (cf. Ceratoglyphina styracicola, which has no scleroites on the abdominal tergum). The siphunculi are not placed on sclerotic black plates.
Other aphids on the same host
Ceratoglyphina roepkei has been recorded on 1 snowbell species (Styrax paralleloneurus).
Blackman & Eastop list 3 species of aphid as feeding on Styrax paralleloneurus worldwide, and provide formal identification keys (Show World list). Of those aphid species, Baker (2015) lists none occurring in Britain (Show British list).