Can I use the abdomen to differentiate B. dorsalis from B. kandiensis and B. invadens syn dorsalis? Can someone provide me with some clear images of these fruit flies?
According to Drew et. al. 2005, Bactrocera invadens is similar to Bactrocera dorsalis (Hendel), from Southeast Asia, and Bactrocera kandiensis (Drew and Hancock), from Sri Lanka, in possessing a very narrow costal band and anal streak, scutum black, parallel-sided lateral postsutural vittae and abdominal tergites III–V with a dark ‘T’ pattern and narrow dark lateral markings on all three terga. It differs from both species in having the scutum base colour dark orange-brown with a dark fuscous to black lanceolate pattern (in most specimens), from B. dorsalis in having a longer aedeagus and narrow lateral postsutural vittae, and from B. kandiensis in having femora entirely fulvous.
See more details in the original description of B. invadens attached.
Regards,
Luis Miguel
https://www.eppo.int/QUARANTINE/data_sheets/insects/DACUDO_ds.pdf
http://www.ncbi.nlm.nih.gov/pubmed/24772542
I think the attached article can be helpful.
Please, find the attached paper for your attention.
Regards,
Komivi
It may be too late to response this question, however you can search for differences in male genitalia of both the species there is no difference in the female ovipositor. The best characters to separate these two species (especially in Sri Lanka, where these species are sympatric)
1- Postpronotal lobe is yellow in dorsalis and in kandiensis it has black anterolateral markings
2- Femora are red brown in dorsalis while in kandiensis apices of femora are black.
Based on male rectal (pheromonal) gland volatiles, the two major components in B. dorsalis (including former putative species - B. invadens, B. papayae and B. philippinensis) are derived from methyl eugenol (ME); while in B. kandensis the pheromonal components are very similar to that found in B. carambolae. The last species has its own endogenously synthesized components with a component (E-coniferyl alcohol, also detected in B. dorsalis) derived from consumed ME.
Intermediate forms, both morphological and pheromonal, (natural hybrids of B. dorsalis and B. carambolae) have been detected in Malaysia. This natural hybridization between B. dorsalis and B. kandiensis. may be occurring in your country.
Thank you Keng Hong Tan and Khalid Manmood for valueable contribution.