Figure 20. Gecarcinidae. a-b in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)

Figure 20. Gecarcinidae. a-b: Cardisoma carnifex (Herbst, 1796), ♂, 78 × 63 mm, Taiwan (ZRC1989.3488). (a) Left side of thoracic sternum without pleon, sterno-abdominal cavity densely covered with setae. (b) Ventral surface of pleon, right side. Flexible and folded cuticle in middle of pleon covering and surrounding intestine. c-d: Discoplax rotunda (Quoy & Gaimard, 1824), ♂, 45 × 40 mm, Taiwan (ZRC1998.432). (c) Thoracic sternum with pleon folded against body. Position of telson underneath edge of sterno-abdominal cavity visible. (d) Thoracic sternum without pleon. No press-button present. A: anterior; ed: edge i: intestine; P: posterior; P6: pleon segment 6; s: setae; sac: sterno-abdominal cavity; S4: sternite 4; S5: sternite 5; t: telson. Scale bar = 5 mm.