Thank you for those examples, but do you have any that evolve upward instead of outward? Something actually becoming more complex within a period of observation? That's what I'm really interested in here.ThisIsSnake said:Oh you should have made it clear you were trying the micro/macro evolution fallacy. Since you've decided bacteria can't have species:
The Hawthorn fly species is currently speciating, with the Hawthorns feeding on apples only able to successfully breed with regular Hawthorns 4-6% of the time and has developed it's own distinct life cycle (The Apple Hawthorns mature faster than the regular kind).
The Liger is technically an example of speciation in a single generation, with Ligers unable to mate.
More suitable examples are ring species.
Larus Gulls
The Herring Gull L. argentatus, which lives primarily in Great Britain and Ireland, can hybridize with the American Herring Gull L. smithsonianus, (living in North America), which can also hybridize with the Vega or East Siberian Herring Gull L. vegae, the western subspecies of which, Birula's Gull L. vegae birulai, can hybridize with Heuglin's gull L. heuglini, which in turn can hybridize with the Siberian Lesser Black-backed Gull L. fuscus. All four of these live across the north of Siberia. The last is the eastern representative of the Lesser Black-backed Gulls back in north-western Europe, including Great Britain.
The Lesser Black-backed Gulls and Herring Gulls are sufficiently different that they do not normally hybridize; thus the group of gulls forms a continuum except where the two lineages meet in Europe.
Ensatinas
The Ensatina salamander has been described as a ring species in the mountains surrounding the Californian Central Valley. The complex forms a horseshoe shape around the mountains, and though interbreeding can happen between each of the 19 populations around the horseshoe, the Ensatina eschscholtzii subspecies on the western end of the horseshoe cannot interbreed with the Ensatina klauberi on the eastern end. As such it is thought to be an example of incipient speciation, and provides an illustration of "nearly all stages in a speciation process".
There's also the Greenish Warbler in the Himalayas if you want to see another.
And the liger isn't a species, it's just a hybrid. Being unable to breed disqualifies it from being considered an actual species: "A species is defined as a group of organisms capable of interbreeding and producing fertile offspring."