intergradation

[ in-ter-grey-dey-shuhn ]

/ ˌɪn tər greɪˈdeɪ ʃən /

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noun

the act or process of intergrading or the state of being intergraded.

an evolutionary process by which different species of organisms tend to merge through a series of intermediate stages or grades.

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Origin of intergradation

First recorded in 1870–75; inter- + gradation

in·ter·gra·da·tion·al, adjective

Nevertheless, the two specimens are clearly referable to their respective species and show no tendency toward intergradation.
A Synopsis of the American Bats of the Genus Pipistrellus|Walter W. Dalquest
Intergradation was noted in animals from 23 miles southwest of Newcastle and Arvada, Wyoming.
Speciation in the Kangaroo Rat, Dipodomys ordii|Henry W. Setzer
Intergradation occurs with the latter subspecies at Vernal, Uintah County, in cranial measurements and in color.
Speciation in the Kangaroo Rat, Dipodomys ordii|Henry W. Setzer
Intergradation has been noted in specimens from the eastern and southeastern shores of Great Salt Lake.
Speciation in the Kangaroo Rat, Dipodomys ordii|Henry W. Setzer

Intergradation with Dipodomys ordii fetosus occurs near Lund.
Speciation in the Kangaroo Rat, Dipodomys ordii|Henry W. Setzer