[Ichneumon]

No. Fruit flies can breed with fruit flies

Gee, really?

Cryptic reproductive isolation in the Drosophila simulans species complex

Gametic incompatibilities between races of Drosophila melanogaster

Adaptive evolution drives divergence of a hybrid inviability gene between two species of Drosophila

Genetic dissection of hybrid incompatibilities between Drosophila simulans and D. mauritiana. I. Differential accumulation of hybrid male sterility effects on the X and autosomes

Genetic dissection of hybrid incompatibilities between Drosophila simulans and D. mauritiana. III. Heterogeneous accumulation of hybrid incompatibilities, degree of dominance, and implications for Haldane's rule

Early events in speciation: polymorphism for hybrid male sterility in Drosophila

A test of the chromosomal rearrangement model of speciation in Drosophila pseudoobscura

Association of Misexpression with Sterility in Hybrids of Drosophila simulansand D. mauritiana

The Genetics of Speciation by Reinforcement

Evolutionary novelties in islands: Drosophila santomea, a new melanogaster sister species from Sao Tome

[BMCDA]

Ah, thanks for the links ;)

[Tribune7]

Oh man and I was just about to leave this stupid thread. Thanks for the data dump, btw.

Fruit flies can breed with fruit flies . . .Gee, really?

Yes, really. As per your links: (did you read them?)

Those that are long enough to allow insemination, however, involve the transfer of many sperm, but only a fraction of these heterospecific sperm are stored by females, who also lay fewer eggs than do D. simulans females mated with conspecific males.

We now report that, in one direction, crosses between the above populations produce far fewer offspring than reciprocal crosses due to a lower rate of egg hatch.

Now, being as how it was a data dump, you can forgive me for not reading them all closely (albeit I did scan them).

It seems that point of these studies is that hybrids tend to be sterile. No sugar Sherlock. The links say interbreeding does occur, to spell it out.