Webster's English Dictionary

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ecospecies

eco.spe.cies \'ek-o--.spe--(.)she-z, 'e--ko--, -(.)se-z\ 
   \.ek-o--spi-'sif-ik, .e--ko--\ n : a subdivision of a cenospecies capable 
   of free gene interchange between  its members without impairment of 
   fertility but less capable of fertile crosses with members of other 
   subdivisions and typically more or less equivalent to the taxonomic species 
   - eco.spe.cif.ic aj