FIGURE 13. Petta williamsonae n in A revision of the genus Petta Malmgren, 1866 (Annelida: Pectinariidae), with two new species from deep waters of southeastern Australia, and comments on phylogeny of the family

FIGURE 13. Petta williamsonae n. sp. Methyl green stained body of holotype (AM W.50667): A. Ventral view of anterior end; B. Lateral view of anterior end; C. Close-up view of right branchiae 1–2 and dorso-lateral pad on segment 5, in lateral view; D. Close-up view of anterior margin on cephalic veil, in ventral view; E. Close-up ventral view of left lobes on segments 1–3; F. Close-up view of left branchiae; G. Dorsal view of posterior end. H. Ventro-lateral view of posterior end, showing lobes on lateral margin of scaphe; I. Dorso-lateral view of posterior end. Abbreviations: ac, anal cirrus; an, anus; br, branchiae; bt, buccal tentacles; cv, cephalic veil; dlp, dorso-lateral pad; dms, dorsal margin of scaphe; hb, hump of branchia; lb, lamellae of branchia; nec, neurochaetae; noc, notochaetae; op, operculum; or, opercular rim; p, paleae; s, segment; sc, scaphe; tc, tentacular cirri; sh, scaphal hooks; vl, ventral lappet.