TAXONOMY OF GENUS OCTOLASION ÖRLEY, 1885 AND OCTODRILUS OMODEO, 1956

Abstract

The article presents the results of the study to clarify the systematic status of mass biotypes Ot. tyrtaeum s. l. and Oc. transpadanus s. l.The results of genetic marking and karyological research indicate that there are clear differences between the representatives of these species complexes. After the statistical processing of the results of the morphometric study of worms Ot. tyrtaeum s. l. and Oc. transpadanus s. l. in the aggregate sample of these two species complexes, a number of morphological features were found that significantly differentiate them from each other.According to the results of complex analysis of genetic, karyological, qualitative and quantitative morphological parameters of the studied species complexes, it was found that Ot. tyrtaeum s. l. and Oc. transpadanus s. l. are polytypical species because they are represented by a number of discrete forms.Within Ot. tyrtaeum s. l. there are at least 4 mass biotypes (Ot. tyrtaeum-A, Ot. tyrtaeum-B, Ot. tyrtaeumC, Ot. tyrtaeum-ІІІa) that are clearly distinguished by a number of traits and at least 15 rare biotypes that need further explore. Species complex Oc. transpadanus s. l. represented in the territory of Ukraine by two clonal polyploid forms (Oc. transpadanus-A and Oc. transpadanus-B) and three groups of highly polymorphic, different ploidy and morphologically distinct biotypes (Oc. transpadanus-(V), Oc. transpadanus-(Z.), Oc. transpadanus-(C.)). Some mass biotypes (Ot. tyrtaeum-ІІІa, Oc. transpadanus-(Z.), Oc. transpadanus-(C.)) are characterized by the presence of significant features that go beyond intraspecific variability.For facilitate identification of identified biotype, was created a definition table based on quantitative and qualitative morphological, some anatomical and cariological features. Also, the article provides specified diagnostic features of the genera Octolasion Örley, 1885 and Octodrilus Omodeo, 1956.