FIGURE 18 in Megalomma Johansson, 1925 (Polychaeta: Sabellidae) from America and other world-wide localities, and phylogenetic relationships within the genus 2861

FIGURE 18. Selected structures of Megalomma species. A–B) Thorax, ventral views; C) thorax, lateral view; D–F, K, T) thorax, dorsal views; G) dorsal lips; H–J) dorsalmost radiolar eyes; L–M) superior narrowly hooded thoracic chaetae; N) companion chaeta; O) inferior thoracic chaetae type C; P) abdominal uncinus; Q) thoracic uncinus; R) narrowly hooded abdominal chaeta. A, D, G–H) Megalomma modestum (de Quatrefages, 1866); B, F, J) Potamilla anophthalma Hartmann-Schröder, 1960; C, E, I) Potamilla clara Chamberlin, 1919; K–R) Megalomma mushaense (Gravier, 1908a). A, D, G–H) Syntype from Perú, MNHN, 163; B, F, J) holotype from Perú, ZMH, 15435; C, E, I) holotype from California, MCZ, 2171; K–R) modified from Gravier, 1908a. Abbreviation: dl dorsal lip. Scale bars: A–B, D–F: 1 mm; C: 2 mm; G–J: 0.25 mm; K–R: not scaled.