Amphinomidae

REMARKS Amphinomid subfamilies were proposed and defined by Borda et al. (2012, 2015). They were initially regarded as different clades, informally named after the body shape as fusiform vs rectangular (rectilinear). However, as indicated below, body shape changes during development and this explains why it is being regarded as an additional, non-diagnostic feature. The main difference relies in the type of branchiae, their stems, and branching pattern of branchial filaments. An additional relevant feature is the presence of cirriform branchiae along some anterior chaetigers, which is currently restricted to some archinomin genera.