FIGURE 4. Scalibregma australis n in New species of Scalibregmatidae (Annelida, Polychaeta) from the East Antarctic Peninsula including a description of the ecology and post-larval development of species of Scalibregma and Oligobregma

FIGURE 4. Scalibregma australis n. sp. SEMS of post-larvae and juveniles from Sta. NBP-35: A, 10-setiger post-larva, left lateral view; B, short spinous setae and capillaries from setiger 1; C, 16-setiger post-larva, ventral view; D, 15-setiger postlarva, lateral view; E, 18-setiger juvenile, dorsal view; F, 20-setiger juvenile, right lateral view; G, same, detail of prostomium, peristomium, and setigers 1‒3; H, 22-setiger juvenile, right lateral view; I, 26-setiger juvenile, right lateral view; J, same, detail of prostomium, peristomium, and setigers 1‒5 showing development of branchiae on setigers 2‒5; K, same, detail of setigers 2‒4, showing early development of branchiae; L, same specimen showing short spinous setae and capillaries from setiger 1; M, two lyrate setae and a single short spinous seta (arrow) from setiger 4 from 24-setiger juvenile.