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Aphidomorpha : Aphididae : Aiceoninae
 

 

Subfamily Aiceoninae

Biology and Morphology

On this page: Biology Morphology Genera

Biology

The Aiceoninae is a small subfamily, with only 14 recognised species all in one genus (Aiceona). They feed mainly on laurels (Lauraceae e.g. Actinodaphne), but one species (Aiceona titabarensis) is described from the walnut family (Juglandaceae). Several species are described from unidentified hosts. Unusual characteristics of Aiceoninae are that sexuales may be found in colonies at almost any time of year, and that (like some Greenideinae) the oviparae lay stalked eggs. All species live in east, south and south-east Asia including China, India, Nepal, Malaysia, Thailand, and Japan.

 

Morphology

Adult Aiceoninae viviparae may be apterous or alate, and are wax-powdered. Their antennae are usually 6-segmented, rarely 5-segmented, and 0.34 - 0.66 times as long as the body. The terminal process is short, only 0.25-0.33 times as long as the base of antennal segment VI (cf. Aphidinae which rarely have a very short terminal process). Primary and secondary rhinaria are round or oval and are non-ciliated. In apterae the compound eyes are only 3-faceted triommatidia (cf. Aphidinae which always have multi-facetted compound eyes, usually with a triommatidium). The rostrum reaches to the middle to hind coxae, with the ultimate rostral segment wedge-shaped, 0.5 - 1.4 times as long as the second hind tarsal segment, and with 2 - 8 accessory hairs. In apterae the body is not sclerotized over the dorsum and bears no marginal tubercles (cf. Aphidinae, which often have marginal tubercles). The legs are pale, with the trochanter fused with the femur (also in apterae of Phyllaphidinae & Tamaliinae). In all female morphs the siphunculi are well developed on hair-bearing cones. The cauda is broadly round at the apex, with fine and short hairs. The anal plate is round at the apex. The genital plate is not defined. The body length of Aiceoninae apterae is 1.6 - 3.3 mm.

Aiceona titabarensis aptera, mount. By permission of Roger Blackman, copyright AWP all rights reserved.

The eyes of alatae are compound. The pterostigma of the forewing is short, with 1 or 2 lines of fine hairs along the subcostal vein and pterostigma. The radial sector comes off at a point a little behind middle of the pterostigma. The media is twice branched. The hind wing has 2 oblique veins. The alate abdomen has a large sclerite reaching the margin with no marginal sclerites. Both oviparae and males are alate (as are oviparae of Phloeomyzinae, Tamaliinae, and most Neophyllaphidinae). The oviparae lack pseudo-sensoria on the hind tibia. Sternite VIII has short and stout spine-like hairs among fine and short hairs. Alate males have few secondary rhinaria on antennal segment III. They are often without siphunculi, and have many fine hairs on their claspers.

Aiceoninae Genera

Acknowledgements

We particularly thank Colin Favret and Roger Blackman, who have provided invaluable assistance. Most of the subfamily diagnoses have been taken from Heie & Wegierek (2009b), Quednau (1999, 2003, 2010) and Blackman & Eastop (2021), with additional material from Russell (1982),Stroyan (1977), Stroyan (1984) and many others listed in the references for these pages.

We also thank Roger Blackman for allowing us to reproduce his image, above. Note: Any images on pages that are not individually credited are copyright InfluentialPoints under a Creative Commons Attribution License.

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).

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