Figure 9. A in Comparative morphology among trunk limbs of Caenestheriella gifuensis and Leptestheria kawachiensis (Crustacea: Branchiopoda: Spinicaudata)

Figure 9. A, outline of trunk limb 13 of adult female of Caenestheriella gifuensis showing inferred position of praecoxa (P), coxa (C), basis (B), exite (xt), exopod (EX), and the three segments of endopod (EN). Enditic lobes 1–5 are numbered; a, attenuate lobe; s, discoid lobe; broken line proximal to coxa represents arthrodial membrane present in younger limbs; broken line proximal to distal and middle endopodal segments represents arthrodial membranes present in transformed limbs of male; wavy lines are presumed locations of boundaries between proximal endopodal segment and basis, and between basis and coxa. B, hypothetical reconstruction of the origin of the biramal limb by axis duplication. Adult limb with setae along the duplicated ramus (exopod in thick lines) located dorsally and terminally, but only distad along the ventral face; the positions are a mirror image of the setae along the original ramus (endopod in thin lines), which are ventral and terminal, but only distad along the dorsal face; six endopodal segments from Siewing (1960); shape of segments is not significant. Praecoxa (P), coxa (C), basis (B); wavy line with M is mirror tilted slightly upward, toward the viewer.