Table 5. Development times (in weeks, under laboratory conditions) of several structures in the species studied.

	N. werneri	N. maculata (= N. aurea)	N. maculata	N. sp.
Ocelli	4	2	3	3
First gastric filament	3	1	2	2
Second gastric filament	-	-	8	13
Tentacle buds	7	3	3	2
Lappets, pigment spot	-	2	2	-
Gonads	9	3	4	24