Parena nigrolineata (Chaudoir, 1852)

Shi, Hongliang & Liang, Hongbin, 2023, Taxonomic revision of the genus Parena Motschulsky, 1860 (Coleoptera, Carabidae, Lebiini, Metallicina), Zootaxa 5286 (1), pp. 1-144 : 95-96

10. Parena nigrolineata species group

This species group contains six species distributed through nearly all the Oriental Realm and part of the Australian Realm. This group is characterized in the Oriental-Australian species of subgenus Parena as follows: postgenae without suborbital setae; elytra not metallic; male mesotarsomere 1 with or without adhesive setae ventrally; male genitalia with apical lamella thin, apex bent dorsally in lateral view; endophallus with distinct flared basal expansion of primary sclerite; gonocoxite II of ovipositor slightly pointed near apical inner angle, ensiform setae grouped near apical angles. This species group is very similar to the P. plagiata group from Africa, even in the characters on male and female genitalia, so they may be very closely related.

Four species of this group are very similar externally, except for differences in coloration. The other two species P. andrewesi and P. politissima , are quite different from the other four in having elytra with deep depressions and very shallow striae. Moreover, P. andrewesi is also different from other species of this group in having male abdominal sternite VII more deeply emarginate and gonocoxite II of ovipositor longer than in other species.