A little bit is better than nothing: the incomplete parthenogenesis of salamanders, frogs and fish.
A re-examination of the mitochondrial genomes of unisexual salamander lineages, published in BMC Evolutionary Biology, shows them to be the oldest unisexual vertebrates known, having been around for 5 million years. This presents a challenge to the prediction that lack of genetic recombination is a fast track to extinction. See research article http://www.biomedcentral.com/1471-2148/10/238.
Lampert
Kathrin P
KP
Animal Evolutionary Ecology and Biodiversity, University of Bochum, Universitätsstrasse 150, 44780 Bochum, Germany.
Schartl
Manfred
M
D000818:Animals; D005399:Fishes / Q000502:physiology*; D010312:Parthenogenesis; D011898:Ranidae / Q000502:physiology*; D014562:Caudata / Q000502:physiology*