Diagnosis: differs from all treated Zimmermannia species, except amani, by light coloured head. Males can be separated from amani by absence of hair-pencil and females by larger num- ber of antenna1 segments. Diagnostic in male genitalia are the vinculum process, the short narrow gnathos, the shape of the valva and the configuration of the carinae. The female genitalia are characterised by the relatively few setae on T8 and the 4½-5½ convolutions of the ductus spermathecae. E. liguricella can be confused with Trifurcula species, see generic diagnosis.
Description. Male. Forewing length 3.0-4.04 mm
(3.58 ± 0.29, 12), wingspan 7.6- 8.8 mm. Head: frontal tuft and collar yellow to yellow ochreous. Antennae long, with 43- 48 segments (44.9 ± 1.7, 7). Thorax and forewings brown irrorate with yellowish-white (European specimens darker than Moroccan), with sometimes small indistinct white tornal spot; cilia-line hardly visible. Hindwing without hair-pencil, costal bristles or special scales. Humeral lobe distinct, rounded.
Female. Forewing length 3.44-4.0 mm (3.73 ± 0.24, 6), wingspan 7.6- 9 mm. Antennal segments 39-44 (41.6 ± 2.9, 7).
Male genitalia. Capsule length 321-377 µm (357 ± 20.4, 10). Vinculum with ventral plate narrow. Tegumen rounded, with an obvious anteriorly directed, tongue-shaped process. Gnathos with narrow pointed central element, shorter than in related species. Valva (fig. 238) length 270-304 µm (284.8 ± 12.7, 9), narrow triangular, with distinct inner (mesal) lobe in middle; transtillae with short transverse bar. Aedeagus (figs. 356-358) 369-420 µm (398.1 ± 16.7, 10), slightly constricted; ventral carinae long, widely separate, pointing outwards: lateral carinae absent: dorsal carinae simple, pointed; aedeagus dorsally ending in two weakly sclerotised lobes covered with spines, less spines on left lobe. Vesica with small cornuti only.
Female genitalia (figs. 155, 156, 427, 428). T8 with a row of about 10-20 relatively long setae, along anterior margin, and with a row of 10-20 shorter setae more posteriorly, scales absent. Anal papillae with 15-27 setae. Posterior apophyses reaching beyond anterior apophyses. Vestibulum with indistinct internal sclerotisation. Corpus bursae 880-1100 µm, covered with pectinations, especially dense in ductus bursae, partly in concentric bands around signa; signa similar, 308-493 µm (395.9 ± 59.4, 8), 5.5-7.0 X as long as wide. Ductus spermathecae with 4½-5½ convolutions. Larva unknown.
Hostplants: not reared; although evergreen Quercus usually occurs in many of its localities, we have no positive indication that it is the hostplant.
A western mediterranean species, known from the Italian Riviera, France, Spain, Portugal and Morocco. Occurs from sea-level to high elevations in the mountains (1600 m in Spain, 2600 m in Morocco).
Adults fly from 25 April to 1 October.
This taxonomic description is based on Van Nieukerken (1985) and Van Nieukerken et al (2010)