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Fig. 7 | Zoological Letters

Fig. 7

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

Fig. 7

Postlarval instar 2 of Pallenopsis hodgsoni (continued). SEM micrographs (a, c, d) and stereomicroscopic image of Sytox-stained specimen (b). a Detail of palpal and ovigeral larval limbs. The arrow points at the posterior protrusion on the proximal article of the palpal larval limb. Note the externally undivided proximal article of the ovigeral larval limb (1 + 2). b Detail of palpal and ovigeral larval limbs. Arrowheads mark the outline of the external cuticle of both limbs. Note progressing atrophy of the limb tissues as indicated by the restriction of nuclear labeling to the proximal limb portions. c 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. d Detail of posterior body pole. Ventral view. The cuticle of the anal tubercle is distally closed (arrow). The stippled circles highlight the shallow cuticular pits of the ventral organs in walking leg segments 3 and 4. White arrowheads point at the characteristic ventro-distal seta of the future tibia 2 and the subterminal dorsal seta marking the distal end of the propodus. Black arrowheads highlight folds in the limb bud that correspond well with borders of internally developing podomeres. Abbreviations: ovl – ovigeral larval limb; pal – palpal larval limb; wl – walking leg

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