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Species name

Diabrotica fasciata Kirsch 1883: 200

 

Type locality

Ecuador

 

Type depository

MTD, lectotype, male, verified

 

Diagnosis

Body length 7.1-7.2 mm. Body width 3.4-3.6 mm. Head basic color black. Antennae filiform, bi- or tricolored, antennomeres 1-3 yellow, upper sides darkened, antennomeres 4-8 cinnamon brown, antennomeres 9-10 light cadmium, antennomere 11 dark apically. Maxillary palpi and labrum black or chestnut. Pronotum yellow or ochraceous-orange, quadrate, weakly bifoveate, with wide shallow foveae, shagreened with minute wrinkles. Scutellum yellow. Elytra yellow or rufous, with 2 metallic black green bands, one on basis of elytron, another - behind middle. Elytral epipleura completely yellow, sutural angle of elytra round, punctation scattered, fine. Abdomen yellow. Tarsi and tibiae black or chestnut, femora yellow or sulphur yellow. Aedeagus symmetric, with five internal sac sclerites.

 

Known distribution

Costa Rica, Panama, Colombia, Ecuador

 

Host plants

Unknown

 

Remarks

Smith and Lawrence (1967) transfered D. fasciata to the genus Paranapiacaba Bechyné. They noted that the lectotype is a female. We studied the lectotype in MTD and found that it is a male. The internal sac armament of Di. fasciata is typical for Diabrotica species with 5 internal sac sclerites. The most important external morphological feature allowing to distinguish Diabrotica and Paranapiacaba is the length of the third antennomere. This antennomere is around 2 times as long as the second in Paranapiacaba and subequal (notmore than 1.5 times as long as second) in Diabrotica (Smith & Lawrence, 1967). The third antennomere in the lectotype and in all other studied specimens is 1.5 time as long as second. Based on the internal sac armament and morphological features we restore the previous combination and treat Paranapiacaba fasciata in the genus Diabrotica .

 

Potential problems with identification

Diabrotica fasciata Kirsch is very similar to D. militaris Jacoby. They can be separated by the following features: the body is more slender with narrow shoulders in D. fasciata, while it is wider, of round-oval shape in D. militaris; pronotum is narrower in D. fasciata, but wider, slightly transverse in D. militaris; the size and the shape of elytral bands is different in both species. The shape of the internal sac sclerites allows distinguishing Diabrotica fasciata from D. militaris.