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Fig. 9 | Zoological Letters

Fig. 9

From: First description of epimorphic development in Antarctic Pallenopsidae (Arthropoda, Pycnogonida) with insights into the evolution of the four-articled sea spider cheliphore

Fig. 9

Postlarval instar 2 of Pallenopsis vanhoeffeni (continued). SEM micrographs (b, c, e, f) and stereomicroscopic images of Sytox-stained specimens (a, d). a Dorsal view. Note the absence of any intersegmental folds. b Detail of distal walking leg 2 podomeres. Asterisks mark two of the three stereotypic setae on the distal end of the propodus (8). Arrows point at the two auxiliary claws. c Walking leg 1. Note the long dorsal and dorso-lateral setae on the femur (4) and tibiae 1 and 2 (5 and 6, respectively). Asterisks mark the three stereotypic setae on the distal end of the propodus (8). Arrows point at the two auxiliary claws. d Detail of trunk. Ventral view. Asterisks mark the developing ventral ganglia. The arrow points at the ventrally directed anal tubercle. e & f Details of distal walking leg 3 limb bud and anal tubercle in two different specimens. The arrowhead points at the closed (e) and open (f) anus. The white arrowhead indicates the subterminal dorsal seta marking the distal end of the future propodus. In (f), another white arrowhead highlights the ventro-distal seta on the prospective tibia 2 (6). Small white arrowheads trace a fold that presumably corresponds to the future articulation line of tibia 2 and tarsus. Abbreviations: br – brain; ot – ocular tubercle; wl – walking leg

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