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n. pl. au·tap·o·mor·phies
An evolved character or trait that is unique to a single species or group within a larger phylogenetic group. Speech is an autapomorphy of humans among primates.

au·tap′o·mor′phic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
With our data set, in which stamen number in Chloranthus was scored as unknown because of the problematical morphology of the lobed androecium, the three stamens of Canrightiopsis are an autapomorphy and not homologous with the three parts of the androecium of Chloranthus.
Character 40 (velvet setae on coxae) emerged as an autapomorphy of the genus Lasiodora.
Other authors agree that the haustellum as found in Trichoptera is the only unequivocal autapomorphy of adult Trichoptera [25].
This feature is also described as an autapomorphy of Duriatitan humerocristatus found in the British Upper Jurassic sediments of the Clay Formation, early Kimmeridgian in age (NHMUK 44635, Barrett et al., 2010).
Appendices of the midgut are an autapomorphy for Phasmatodea, but Timema have fewer and larger appendices relative to body size.
Moreover, in Limnogeton fieberi one autapomorphy (2-2) is indicated; however, for the subfamily Lethocerinae (Lethocerus deyrollei) the autapomorphic character is not found.
The posterior ponticuli is uniquely derived trait (autapomorphy) within primates which is restricted to some individuals in Homosapiens.
Neofundulus is distinguished from the remaining genera of Rivulidae family by having the following synapomorphies: fourth pectoral radial not expanded ventrally, a subasal longitudinal white-yellowish stripe on the anal fin in males, transverse black bars on caudal fin of females, and black spots on pectoral fin of males (Costa 19986) Neofundulus splendidus presents very narrow yellow lines on the pectoral fins, instead of black spots present on the other Neofundulus species, thus an autapomorphy of this species.
In 1985, Chace used this clear species autapomorphy (presence of hepatic spine) to define a monotypic genus (Kemphyra) and accommodate this species.