FIGURE 39 in Molecular and morphological systematics of Elysia Risso, 1818 (Heterobranchia: Sacoglossa) from the Caribbean region

FIGURE 39. Elysia marcusi, external morphology and egg masses. A, Crawling specimen from Jamaica showing vaginal pore (vp) and antero-lateral furrow (af). B, Crawling specimen from Florida with white spots. C, Resting specimen from Jamaica, showing rounded "gumdrop" posture adopted by slugs on algae. Size = 4 mm (A), 5 mm (B), 4 mm (C). D, Copulating specimens from Jamaica. Translucent penis of slug (left) is visibly being inserted into vaginal pore of larger slug (right); note antero-lateral furrows on both slugs. Field of view = 5 mm. E–H, Egg masses showing variation in ECY. Clutches deposited by Jamaica specimens had either regularly spaced blobs of whitish ECY, one attached to the outside of each capsule (E; width of egg mass = 1.2 mm), or else a thread of yellow ECY running along the inside edge of the string of egg capsules (F; width of egg mass = 1.6 mm). An egg mass from San Salvador (G) containing both white and yellow ova at the four-cell stage had ECY deposited as one white blob or streak per capsule for the first turn of the egg spiral, but thereafter as one yellow blob or streak every third capsule. Width of egg mass = 1.5 mm. An egg mass from Florida lacked ECY (H; width of egg mass = 1.0 mm).