Schematic illustrations of the segmental annulation pattern and the shape of pygidial lobes in the studied Orbiniella species. Exact borders between the body segments are hard to define, the number of narrow annuli between parapodia that are used in species diagnoses are shown in grey colour A Orbiniella griegi Meca & Budaeva, sp. nov. (Shallow) B Orbiniella mayhemi Meca & Budaeva, sp. nov. (Deep 3) C Orbiniella parapari Meca & Budaeva, sp. nov. (Deep 2) D Orbiniella petersenae sensu stricto (Deep 1) E Orbiniella sp. (Deep 4). Abbreviations: al: anal lobes; na: narrow annuli; per: peristomium; pg: pygidium; pr: prostomium; p1–p12: parapodia number in the anterior body region.