Figure 22 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)

Figure 22. Pleon-holding mechanism of Varunidae. a-b: Varuna litterata (Fabricius, 1798), ♂, 33 × 30 mm, Philippines (ZRC2008.1262). (a) Thoracic sternum without pleon. (b) Ventral surface of pleon. c-d: V. litterata, ♀, 38 × 36 mm, Philippines (ZRC2008.1262). (c) Right thoracic sternum with small vestigial button structure present. (d) Ventral surface of pleon with small vestigial socket in middle of sixth pleon segment, adjacent to border of telson. e-f: Helograpsus haswellianus (Whitelegge, 1889), ♂, 21 × 17 mm, Australia (ZRC1995.951). (e) Thoracic sternum without pleon and button structures. (f) Ventral surface of pleon without sockets. A: anterior; B: button; ed: edge; G: gonopods; i: intestine; P: posterior; pl: pleopods; s: setae; sac: sterno-abdominal cavity; so: socket; S5/ 6: sternite 5/6; t: telson; v: vulva; vb: vestigial button; vso: vestigial socket. Scale bar = 5 mm.