Figure 16 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)

Figure 16. Pleon-holding mechanism of Grapsidae. a-b: Grapsus longitarsis Dana, 1851, ♂, 33 × 29 mm, Hawaii (ZRC2000.0448). Scale bar = 5 mm. (a) Thoracic sternum without pleon, round buttons visible. (b) Ventral surface of pleon. Small but distinct socket next to intestine. c-e: Pachygrapsus marmoratus (Fabricius, 1787), ♂, 12 × 10 mm, France (ZMK3514). 3D volume and surface reconstruction from µCT images. Scale bar = 2 mm. (c) Specimen without walking appendages in three-quarter view. (d) Same specimen, telson and pleon removed virtually, buttons visible inside sterno-abdominal cavity (arrow). (e) Same specimen without telson and pleon in frontal view. A: anterior; B: button; G: gonopods; i: intestine; P: posterior; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson. Orange: telson; red: buttons; yellow: pleon segments.