FIGURE 3 in Description of a new species of Sabellidae (Polychaeta, Annelida) from fresh and brackish waters in Europe, with some remarks on the branchial crown of Laonome

FIGURE 3. Laonome xeprovala sp. nov. Semithin section (1 µm) of the branchial crown. (A) Seven pairs of separated radioles but connected by palmate membrane, with dorsal and ventral lips, dorsal pinnular appendages and ventral radiolar appendages visible; (B) Dorsal pinnular appendages fused with dorsalmost radioles; parallel lamella visible (14 µm basal of section A); (C) Left and right part of the ventral lip as well as the parallel lamella fused with one another (5 µm basal of section B); (D) Most radioles fused with one another; parallel lamella broadened (23 µm basal of section C); (E) Right part of dorsal lip fused with basal part of dorsalmost radiolus (22 µm basal of section D); (F) Right and left parts of dorsal lip fused with one another; parallel lamella disconnected in the middle (21 µm basal of section E); (G) Branchial crown fused with the collar ventrally; skeletal cell bars of the left and the right radiolar lobes distinctly separated (19 µm basal of section F); (H) Collar encloses branchial crown completely; mouth opening and dorsal pit visible; common stem of skeletal cells of the left and the right radiolar lobes (45 µm basal of section G); c collar, d dorsal, dl dorsal lip, dp dorsal porus, dpa dorsal pinnular appendage, m mouth opening, p pinnula, pl parallel lamella, pm palmate membrane, ra radiolus, tvp transverse lamellar process, v ventral, vl ventral lip, vra ventral radiolar appendage. Scale bars: A–H = 100 µm.