Figure 21 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)

Figure 21. Pleon-holding mechanism of Varunidae, Hemigrapsus sanguineus (de Haan, 1835). a-b, e-f: ♂, 18 × 16 mm, Germany (ZMK3508). (a) Thoracic sternum in three-quarter lateral view, acute sternal button visible in profile. (b) Ventral surface of pleon. c-d: ♂, 13 × 11 mm (ZMK3509). (c) Thoracic sternum, pleon unfolded. (d) Ventral surface of pleon. (e) Complete specimen in threequarter view. 3D surface reconstruction from µCT images. (f) Same specimen as e, both telson and pleon segment 6 virtually removed, sternal buttons visible inside sterno-abdominal cavity. Lower inset: Telson and pleon segment 6 with socket (arrow). Upper inset: Sterno-abdominal cavtiy, sharp edge marked blue. A: anterior; B: button; ed: edge; fl: flat surface of pleon segment 6; G: gonopod; i: intestine; P: posterior; pl: pleopods; s: setae; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson; v: vulva. Light blue: sharp edge of sterno-abdominal cavity; orange: telson; red: buttons; yellow: pleon segments. Scale bar (a-d) = 1 mm; (e-f) = 5 mm.