Emeia Fu, Ballantyne & Lambkin, 2012

Zhu, Cheng-Qi, Xu, Xiao-Dong & Zhen, Ying, 2022, Systematic review of the firefly genus Emeia Fu, Ballantyne & Lambkin, 2012 (Coleoptera, Lampyridae) from China, ZooKeys 1113, pp. 153-166 : 153

Emeia Fu, Ballantyne & Lambkin, 2012

Type species.

Emeia pseudosauteri Geisthardt, 2004 (designated by Fu, Ballantyne and Lambkin 2012).

Diagnosis

(based on adult male). Emeia belongs to a group of Luciolinae in which the males have aedeagal parameres widely visible beside the phallus ( Ballantyne et al. 2013). Emeia differs from Aquatica wuhana Fu & Ballantyne, 2010 and A. lateralis Motschulsky, 1860, which have black marks on the pronotum ( Fu et al. 2010). Emeia is distinguished from Curtos Motschulsky, 1845, as the species in Curtos have a distinctive longitudinal elytral humeral carina and parameres unequal in length ( Fu et al. 2012). Emeia is closely related to Pygoluciola based on our cox1 phylogeny (Fig. 2 ), but the two genera can be distinguished by the shape of the pronotum, with median anterior margin gently rounded or slightly medianly emarginate in Pygoluciola ( Ballantyne and Lambkin 2006) versus lateral margins of pronotum almost parallel in Emeia .

Description

(based on adult male). Body length 6.5-10.5 mm. Body width 2.7-4.0 mm. Integument black or dark brown, with a narrow (e.g., in E. pulchra , see Fig. 3A ) or thick (e.g., in E. pseudosauteri , see Fig. 8A ) black stripe on pronotum.

Head. Hypognathous; head depressed between eyes, eyes exposed in front of pronotum; antennae filiform, with 11 antennomeres (Figs 3B , 8B ).

Thorax. Pronotum in dorsal view appearing pink-red or orange-red, with a black median stripe, lateral margins almost parallel (Figs 3A , 8A ); surface of elytra smooth, longitudinal carina absent (Figs 3A , 8A ); legs long and straight, no femora or tibiae swollen or curved (Figs 3B , 8B ).

Abdomen. V2-V5 dark brown or black. Light organs present in V6 and V7, entirely occupying V6; V7 semitransparent (Figs 3B , 8B ).

Male genitalia. Trilobate, parameres extending ~0.14 mm (n = 3) beyond phallus; both parameres equal in length (Figs 6A , 12A ).

Figures

Figure 2. Maximum likelihood cox 1 gene tree of Emeia and related genera. The star highlights the new species, E. pulchra Zhu & Zhen sp. nov. Emeia pseudosauteri _ 1 was downloaded from GenBank (MN 722654.1). Emeia pseudosauteri _ 2 was sequenced during this study. Bootstrap values greater than 0.7 from 1000 replicates are shown.

Figure 6. Aedeagusof Emeia pulchra Zhu & Zhen sp. nov. A dorsal view B ventral view C lateral view. Aedeagal sheath of E. pulchra D dorsal view E ventral view. Scale bar: 1 mm.

Figure 12. Aedeagus of Emeia pseudosauteri. A dorsal view B ventral view C lateral view. Male aedeagal sheath of E. pseudosauteri D dorsal view E ventral view. Scale bars: 1 mm.

Figures 3 - 4. Emeia pulchra Zhu & Zhen sp. nov., male 3 habitus of holotype A dorsal view B ventral view 4 right wing, dorsal view. Scale bars: 5 mm (3); 2 mm (4).

Figures 8 - 11. Emeia pseudosauteri Fu, Ballantyne & Lambkin, 2012. Male and female 8 habitus of male A dorsal view. Arrow highlights narrow orange stripe on elytral apices. The color appears darker in this photo, but it is orange and easily seen in both dried and fresh samples B ventral view 9 habitus of female. A dorsal view B ventral view 10 right wing of male. Dorsal view. Arrow points to wing venation, which differs between the two Emeia species 11 right wing of female. Dorsal view. Scale bars: 5 mm (8, 9); 2 mm (10); 0.5 mm (11).