title: [Mass anomalies of the extremities in anurans].
abstract: The author analyses literature data on anomalies of limbs in Anura. It is shown that published data is usually not enough to discuss either conditions of appearance or the causes of anomalies. Traditional statistical methods does not adequately characterise the frequency of anomalies. The author suggests a new criteria for ascertaining the fact of appearance of mass anomalies. A number of experimental data don't correspond to current theoretical ideas about the nature of anomalies. It is considered to distinguish "background" and "mass" anomalies. "Background" anomalies can not be a good indicator of unfavourable condition of development.
authors.affiliation: St.-Petersburg State University, Biology and Soil Faculty, Russia.
authors.forename: E E
authors.initials: EE
authors.lastname: Kovalenko
mesh_terms: D000818:Animals; D000830:Animals, Laboratory; D000835:Animals, Wild; D001001:Anura / Q000002:abnormalities*; D005121:Extremities / Q000196:embryology / Q000254:growth & development; D017880:Limb Deformities, Congenital / Q000145:classification / Q000209:etiology / Q000662:veterinary*