Laxoendothyridae Hance, Hou & Vachard 2011

Family LAXOENDOTHYRIDAE Hance, Hou & Vachard, 2011 Incomplete septation in the inner whorls, followed by adult whorls with a complete septation. Adult chamber endothyrid; i.e., inflated, hemispherical with sutures generally deep. Supplementary deposits absent in many genera or represented by discontinuous tubercles or a terminal spine. Wall simple, dark. Aperture generally simple. Late Devonian–late Brigantian. Composition: Laxoendothyra Brazhnikova & Vdovenko, 1972; Andrejella Malakhova, 1975; Avesnella Conil & Lys, 1970; Crassiseptella Brenckle & Hance, 2005; Endolaxina Hance, Hou & Vachard, 2011; Laxoseptabrunsiina Vachard, 1977; Rectoavesnella Conil & Lys, 1977; Spinolaxina Conil & Naum, 1977.