Fig. 6

Type 2 postembryonic development of Pycnogonida. a-c Three attaching postembryonic instars of Nymphon grossipes (modified from [65]). Arrows mark thread-like secretions of the cheliphoral attachment gland. a Lecithotrophic protonymphon larva, lateral view. b Postlarval instar with articulated walking leg 1 and limb bud of walking leg 2, ventral view. c Oldest attaching instar, a late postlarva with articulated walking legs 1–3 and elongate limb bud of walking leg 4 (the latter considered as three-articled in [65]), ventral view. d Lecithotrophic protonymphon larva of Nymphon unguiculatum, ventral view, SEM. e Lecithotrophic protonymphon larva of Ammothea carolinensis, ventral view, SEM. f, g Postlarval instars 1 and 2 of Ammothea bicorniculata, ventral views, SEM. Note increasing reduction of palpal and especially ovigeral larval limbs. d-g modified from [20, 21] and reproduced with permission of Springer