a. Macrotis, the Rabbit-Eared Bandicoot, a marsupial.
b. Microtus, shrews, very small rodent-like things (but not rodents, I don't think).
c. Macrotus, a group of bats, microchiropterans
I rest my case.
EDIT: Please let me adjust this entry in accordance with today's holiday.
YARR, me hearties! Cast yer eyes on this collection of these like-named lubber beasties!
Italics are for snivelling science-wenches! Walk the plank, leany-writin!
a. Macrotis</i>, the Rabbit-Eared Bandicoot, NOT a sea-goin' beast!
b. Microtus</i>, shrews, like tiny bilge-rats they are!
c. Macrotus</i>, a group of bats, flyin' bilge-rats!
Avast! Grog all around!