Eulachnini, Baker, 1920

Théry, Thomas, Kanturski, Mariusz & Favret, Colin, 2018, Molecular Phylogenetic Analysis and Species Delimitation in the Pine Needle-feeding Aphid Genus Essigella (Hemiptera, Sternorrhyncha, Aphididae), Insect Systematics and Diversity (AIFB) 2 (4), No. 1, pp. 1-15 : 8-11

Within Eulachnini

Since its description ( Hille Ris Lambers 1966b), Pseudessigella has always been classified as a genus intermediate between Eulachnus and Essigella . Indeed, Pseudessigella shares characters with Eulachnus , such as simple tarsal claws (not incised), and with Essigella , such as 5-segmented antennae ( Hille Ris Lambers 1966b; Sorensen 1991, 1994). Pseudessigella also shares with Essigella a head fused with the pronotum ( Kanturski et al. 2017a) and with Eulachnus a membranous abdominal dorsum ( Kanturski et al. 2017a; Sorensen 1991, 1994). Sorensen, in his revision of the genus Essigella (1994) , highlighted morphological proximities between Pseudessigella and Essigella , notably in the close patterns of their abdominal dorsal chaetotaxy. In contrast, a more recent morphological study pointed out that, except for its 5-segmented antennae, the general morphology of Pseudessigella was closer to that of Eulachnus ( Kanturski et al. 2017a) . Our analyses places Pseudessigella as sister-group to Essigella ( Fig. 2 , pp = 100%), as predicted by Sorensen (1991, 1994). The 5-segmented antennae and the head fused with the pronotum are therefore synapomorphies of Essigella and Pseudessigella , and the incised tarsal claws are an autapomorphy of Essigella . In contrast, the membranous abdominal dorsum present in Eulachnus and Pseudessigella is plesiomorphic.

a Populations in red indicate difference in BI results. They represent one unique MOTU.

b Only the BI results are indicated. ML results are similar to those with Gnd using GMYC.

Figures

Fig. 2. Phylogenetic tree (ML and BI) of Essigella species using concatenate ATP6, COI, EF-1α and Gnd. Pinus species of the subgenus Strobus appear either in orange or in red, those of the subgenus Pinus either in green or in blue. Color nuances represent infragroup within each subgenus. Nonidentified Pinus and other Pinaceae are in black.Values indicate ML bootstrap % values followed by Bayesian posterior probabilities % values.