Desmolorenzenia
Desmolorenzenia Freudenhammer, 1975 (ref. ID; 877)
ref. ID; 877
Freudenhammer (1975) established a new genus Desmolorenzenia for all desmoscolecid species with 17 quadricomoid main rings, a desmoscolecoid setal pattern and a double conical shaped ring of inversion. Previously those species were classified within the genera Desmoscolex by Steiner (1916), Filipjev (1922), Lorenzen (1969) and in Quadricoma by Timm (1970). The quadricomoid main rings in Desmolorenzenia are formed by two heterogeneous cuticular annules covered by a layer of concretion (desmos). In the anterior main rings, the anterior annule is enlarged, swollen, inducing a quadricomoid shape (i.e. with triangular outline) of the main rings with a posteriorly directed slope. In the posterior main rings the reverse applies. An abrupt reversal of the slope of the main rings occurs within a double conical shaped main ring with both cuticular annules equally enlarged. The main rings are separated by interzones of naked, narrow cuticular rings, which may be partly covered by an extension of the desmos of the main rings. The only difference with the genus Desmoscolex lies in the shape of the main rings and the abrupt reversal in direction of the slope of the triangular outline. Decraemer (1984) prefer to classify Desmolerenzenia as a subgenus within the genus Desmoscolex. (ref. ID; 877)