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55 results for “Eubrachyura”
Figure 14 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 14. Pleon-holding mechanism of Pseudothelphusidae. a-b: Fredius reflexifrons (Ortmann, 1897), ♂, 55 × 35 mm, Brazil (ZRC2010.0413). (a) Thoracic sternum without pleon. (b) Ventral surface of pleon, densely covered by setae. c-d: Potamocarcinus nicaraguensis Rathbun, 1893, ♂, 69 × 44 mm, Nicaragua (ZRC1998.63). (c) Thoracic sternum without pleon. Thickened edge of sternite 5 bordering on sternite 4 indicated by arrow (te). (d) Ventral surface of pleon, densely covered by setae. e-f: P. nicaraguensis, ♀, 60 × 39 mm, Nicaragua (ZRC1998.63). (e) Right thoracic sternum without pleon, anterior aspect. Vestigial button present very close to vulva. (f) Ventral surface of right half of pleon with vestigial socket. A: anterior; B: button; G: gonopods; i: intestine; P: posterior; s: setae; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson; te: thickened edge of S5; v: vulva; vb: vestigial button; vso: vestigial socket. Scale bar = 5 mm.
Figure 13 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 13. Pleon-holding mechanism of the trichodactylid crab Trichodactylus fluviatilis Latreille, 1828. a-b: ♀, 29 × 26 mm, Brazil (ZMK1567). (a) Thoracic sternum without pleon. (b) Ventral surface of pleon. c-d: T. fluviatilis Latreille, 1828, ♂, 21 × 18 mm, Brazil (ZMB21540). 3D volume and surface reconstruction from µCT images. (c) Complete specimen in three-quarter view. Pleon not firmly attached. (d) Same specimen, telson and pleon segment 6 virtually removed. Buttons visible inside sterno-abdominal cavity (arrow). A: anterior; fl: flat surface of P6; P: posterior; pl: pleopods; s: setae; sac: sterno-abdominal cavity; S5: sternite 5; t: telson; v: vulva. Orange: telson; red: buttons; yellow: pleon segment 6. Scale bar = 5 mm.
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.
Figure 19 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 19. Pleon-holding mechanism of Gecarcinidae. a-b: Discoplax gracilipes Ng & Guinot, 2001, ♂, 49 × 43 mm, Philippines (ZRC2001.2305). (a) Left side of thoracic sternum without pleon. Button structure present, but not visible due to dense setal cover, location indicated by arrow. (b) Ventral surface of pleon, right side. c-d: Gecarcinus quadratus Saussure, 1853, ♂, 51 × 40 mm, Costa Rica (ZRC2011.0849). (c) Thoracic sternum without pleon. (d) Ventral surface of pleon. e-f: Gecarcoidea lalandii H. Milne Edwards, 1837, ♂, 64 × 46 mm, Christmas Island (ZRC1987.869–870). (e) Thoracic sternum without pleon. (f) Ventral surface of pleon. A: anterior; B: button; ed: edge; fl: flat surface of P6; i: intestine; lb: location of button; P: posterior; P6: pleon segment 6; s: setae; sac: sternoabdominal cavity; so: socket; st: setal tuft; S5: sternite 5; t: telson; te: thickened edge. Scale bar = 5 mm.
Figure 11. 3D in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 11. 3D reconstruction of the pleon-holding mechanism of a potamonautid crab in situ. Potamonautes aloysiisabaudiae (Nobili, 1906) ♂, 29 × 21 mm, Uganda (ZMK3505), volume and surface reconstruction from µCT images. (a) Complete specimen in three-quarter aspect. Pleon in natural position. (b) Same as A, but sixth pleon segment transparent so that press-button structures visible while in contact (arrow). (c) Frontal view, P6 and telson removed, buttons marked inside sterno-abdominal cavity. Ventral surface of P6 and telson visible in inset. Socket indicated by arrow. Orange: telson; red: buttons; yellow: pleon segment 6. Scale bar = 5 mm.
Figure 10 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 10. Pleon-holding mechanism of Potamonautidae. a-b: Potamonautes berardi (Audouin, 1826), ♀, 33 × 22 mm, Kenya (ZRC2009.0639). (a) Thoracic sternum without pleon. Small acute sternal projection inside triangular sterno-abdominal cavity. (b) Ventral surface of pleon. c-d: P. berardi, ♀, 32 × 22 mm, Kenya (ZRC2009.0639). (c) Thoracic sternum without pleon. (d) Ventral surface of pleon. e-f: Liberonautes latidactylus (de Man, 1903), ♀, 46 × 32 mm, Liberia (ZRC2009.0642). (e) Thoracic sternum without pleon. Button visible. (f) Ventral surface of right side of pleon. Vestigial, shallow socket visible. A: anterior; B: button; fl: flat surface of P6; G: gonopods; i: intestine; P: posterior; pl: pleopods; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson; v: vulva; vso: vestigial socket. Scale bar = 5 mm.
Figure 9 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 9. Pleon-holding mechanism of a juvenile Potamon fluviatile (Herbst, 1785), ♂, 11 × 9 mm, Greece, (ZMK1555), marked on a 3D volume reconstruction of the cuticle, based on µCT images. (a) Specimen complete, telson and sixth pleon segment in natural position. Arrow indicates location of pleon-holding structures. (b) Telson and sixth pleon segment moved from reconstruction into small inset. Buttons (red) visible inside the sterno-abdominal cavity, arrow on inset indicates position of pleonal socket. Note cuticular ridge next to telson. Orange: telson; red: buttons; yellow: pleon segment 6. Scale bar = 2 mm.
Figure 12 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 12. Pleon-holding mechanism of Trichodactylidae. a-b: Goyazana castelnaui (H. Milne Edwards, 1853), ♂, 26 × 21 mm, Brazil (ZRC2010.0410). (a) Thoracic sternum without pleon. (b) Ventral surface of pleon. c-d: 3D reconstruction of Dilocarcinus pagei Stimpson, 1861, ♂, 29 × 23 mm, Paraguay (ZMB15427) from µCT images. (c) Complete specimen in three-quarter view, pleon not firmly attached. (d) Same specimen, telson and pleon segments 6–4 removed. Sternal buttons (arrow) visible inside sterno-abdominal cavity. Inset: Ventral surface of right side of pleon, socket indicated by arrow. 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. Scale bar = 5 mm.
Figure 8 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 8. Pleon-holding mechanism of Potamidae. a-b: Potamon mesopotamicum Brandis, Storch & Türkay, 1998, ♂, 49 × 40 mm (ZMK3507). Scale bar = 2 mm. (a) Thoracic sternum without pleon. Large button structure visible slightly of midline of sternite, closer to suture S5/S6. (b) Ventral surface of pleon. c,-d: P. mesopotanicum, ♀, 48 × 40 mm (ZMK3507). (c) Thoracic sternum without pleon. Scale bar = 2 mm. (d) Ventral surface of pleon. A: anterior; B: button; fl: flat surface of P6; G: gonopods; i: intestine; P: posterior; s: setae; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson; v: vulva. Scale bar = 5 mm.
Figure 6 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 6. Examples of female Gecarcinucidae with pleon-holding structures still present. a-b: Ceylonthelphusa rugosa (Kingsley, 1880), ♀, 54 × 42 mm, Sri Lanka (ZRC1998.650). (a) Thoracic sternum without pleon. Very small vestigial buttons present. (b) Ventral surface of pleon. No socket visible on completely flat sixth pleon segment. c-d: Parathelphusa valida Ng & Goh, 1987, ♀, 48 × 38 mm, Malaysia (ZRC1996.1999). (c) Thoracic sternum without pleon. Large round buttons visible on S5. Sterno-abdominal cavity without pronounced edge, but still triangular. (d) Ventral surface of pleon. Socket shallow, but present in middle of sixth pleon segment. A: anterior; B: button; fl: flat surface of P6; P: posterior; pl: pleopod; s: setae; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson; v: vulva; vb: vestigal buttons. Scale bar = 5 mm.
Figure 7 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 7. Pleon-holding mechanism of Potamidae. a-b: Himalayapotamon sunkoshiense Brandis & Sharma, 2005, ♂, 40 × 31 mm, Nepal (ZMK3506). (a) Thoracic sternum without pleon, setae inside sterno-abdominal cavity. (b) Ventral surface of pleon. c-d: H. sunkoshiense, ♀, 46 × 35 mm, Nepal (ZMK3506). (c) Thoracic sternum without pleon. Dense setal cover on S4. (d) Ventral surface of pleon. Setae on edge of pleon segment typically found in adult eubrachyuran females are very prominent in this specimen. e-f: Potamon hueceste Pretzmann, 1962, ♂, 70 × 59 mm, Iran (ZMK3510). A: anterior; B: button; fl: flat surface of P6; G: gonopods; i: intestine; P: posterior; s: setae: sac: sternoabdominal cavity; so: socket; S5: sternite 5; t: telson; v: vulva. Scale bar = 1 mm.
Figure 5 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 5. Pleon shape of the gecarcinucid Irmengardia johnsoni Ng & Yang, 1985, ♂, 13 × 12 mm, Singapore (ZRC2013.1445). (a) Photo of ventral side of specimen showing T-shaped pleon. (b) 3D surface reconstruction, based on µCT images. Arrow indicates position of pleon-holding mechanism. (c) Volume rendering of µCT images, frontal view. Telson and sixth pleon segment virtually removed, sternal buttons (red) visible inside sterno-abdominal cavity. B: button; S5: sternite 5; t: telson. Scale bar = 5 mm.
Figure 29 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 29. Schematic drawings of the structures contributing to pleon-holding and the pleon movements involved in unfastening the pleon. a-c: Press-button mechanism. (a) Pleon inside sterno-abdominal cavity, fastened by button structures (red), ventral view. (b) Pleon moved towards anterior, buttons disengaged. (c) Cross-section through sternite 5 with unciform button pointing towards anterior (red) and pleonal socket on pleon segment 6 folded over the button. Arrow indicates pleon movement to disengage press-button mechanism. d-e: Overhanging edge system. (d) Telson underneath overhanging edge (red) of sterno-abdominal cavity on sternite 4, ventral view. (e) Telson removed from underneath the edge by movement towards posterior. f-g: Wet adhesion via moisture and dense setal covering. (f) Overview of pleon with marginal setae (red) and setal patches on sternal plates (orange) inside sterno-abdominal cavity. Movement to break contact unclear. (g) Cross-section of contact between sternite 5 and pleon segment 6 facilitated by setae and water in between (wet adhesion). Black: pleon; blue: water; dark grey: border of sternoabdominal cavity/edge of telson underneath overhanging edge; light grey: sutures between sternal plates; P6: pleon segment 6; red/orange: structures contributing to functional pleon holding; S5: sternite 5.
Figure 4 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 4. Pleon-holding structures of Gecarcinucidae. a-c: Nautilothelphusa zimmeri (Balss, 1933), ♂, 37 × 37 mm, Indonesia (ZRC2000.1707). (a, b) Thoracic sternum with and without pleon. Note button not covered by pleon in b. (c) Ventral surface of pleon. D-E: N. zimmeri, ♀, 32 × 33 mm, Indonesia (ZRC2000.1707). (d) Thoracic sternum without pleon, button present. (e) Ventral surface of pleon, no socket present, eggs attached to pleopods are visible. A: anterior; B: button; E: egg; i: intestine; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; P: posterior; pl: pleopod; P6: pleon segment 6; t: telson; v: vulva. Scale bar = 5 mm.
Figure 3 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 3. Pleon-holding mechanism of Parathelphusa pantherina (Schenkel, 1902), ♂, 36 × 28 mm, Indonesia, (ZRC2000.1705), marked on a 3D volume reconstruction of the cuticle, based on µCT images. a-b: Three-quarter view of specimen. Scale bar = 1 cm. (a) Specimen complete, telson and sixth pleon segment in natural position. (b) Telson and sixth pleon segment removed from reconstruction, buttons visible inside sterno-abdominal cavity. (c) Specimen in dorsal view, volume reconstruction of cuticle rendered see-through. Pleon in folded position, buttons in contact with sockets (arrow). Scale bar = 5 mm. (d) Surface reconstruction of sixth pleon segment and telson. Ventral surface with socket in view. B: button; so: socket. Orange: telson; red: buttons; yellow: pleon segment 6. Scale bar = 5 mm.
Figure 2 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 2. Pleon-holding structures of Gecarcinucidae. a-d: Esanthelphusa dugasti (Rathbun, 1902), ♂, 50 × 40 mm, Thailand (ZRC2014.0020). (a) Thoracic sternum with pleon. Arrow indicates location of pleon-holding structures. (b) Thoracic sternum without pleon. (c) Close-up of left half-moon-like button; note striped appearance on anterior margin. (d) Ventral surface of pleon. e-g: Parathelphusa maculata de Man, 1879, ♂, 55 × 40 mm, Malaysia (ZRC, no catalogue number). (e) Thoracic sternum without pleon. (f) Closeup of right half-moon-like button. (g) Ventral surface of pleon. A: anterior; B: button; i: intestine; P: posterior; P6: pleon segment 6; s: setae; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson. Scale bar = 5 mm except for c (500 µm) and f (2 mm).
Figure 1 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 1. Pleon-holding structures of Gecarcinucidae. a-b: Barthelphusa jacquemontii (Rathburn, 1905) ♂, 51 × 34 mm, India (ZRC2009.0912). (a) Thoracic sternum without pleon. (b) Ventral surface of pleon. c-d: Sodhiana blanfordi (Alcock, 1909), ♂, 45 × 34 mm, Pakistan, (ZRC2014.0101). (c) Thoracic sternum without pleon. (d) Ventral surface of pleon. e-f: S. blanfordi, ♀, 39 × 30 mm, Pakistan, (ZRC2014.0101). (e) Thoracic sternum without pleon, note wide sterno-abdominal cavity. (f) Ventral surface of pleon. A: anterior; B: button; fl: flat surface of P6; G: gonopod; i: intestine; P: posterior; s: setae; sac: sterno-abdominal cavity; so: socket; st: setal tuft; S5: sternite 5; t: telson; v: vulva. Scale bar = 5 mm.
FIG. 12. — Archaeochiapasa mardoqueoi n. gen., n in Archaeochiapasidae n. fam., a new early Cenomanian brachyuran family from Chiapas, Mexico, new hypothesis on Lecythocaridae Schweitzer & Feldmann, 2009, and phylogenetic implications (Crustacea, Decapoda, Brachyura, Eubrachyura)
FIG. 12. — Archaeochiapasa mardoqueoi n. gen., n. sp., male 10.3 × 11.1 mm, holotype (IHNFG-5616), close-up of pleon: A, first three somites (a1-a3) in dorsal position; B, last somites plus telson; C, close-up of posterior portion of carapace, with first three pleonal somites and reduced P4 or P5. Abbreviations: a1- a3, pleonal somites a1-a3 in dorsal position; a4-a6, pleonal somites 4-6, ventrally folded; b.p., location of pleonal socket covering sternal press-button; fl, flange; P, P4 or P5; r, thickened carapace border; t, telson. Scale bars: A, 2 mm; B, 1 mm; C, 3 mm.
FIG. 10. — Archaeochiapasa mardoqueoi n. gen., n in Archaeochiapasidae n. fam., a new early Cenomanian brachyuran family from Chiapas, Mexico, new hypothesis on Lecythocaridae Schweitzer & Feldmann, 2009, and phylogenetic implications (Crustacea, Decapoda, Brachyura, Eubrachyura)
FIG. 10. — Archaeochiapasa mardoqueoi n. gen., n. sp., male 10.3 × 11.1 mm, holotype (IHNFG-5616): A, close-up of mxp3, with developed exopodite; B, C, left and right chelipeds. Abbreviations: ex, exopodite; i, endopodite ischion; m, endopodite merus; t.s., thoracic sternum. Scale bars: A, 1 mm; B, C, 2 mm.
FIG. 9. — Archaeochiapasa mardoqueoi n. gen., n in Archaeochiapasidae n. fam., a new early Cenomanian brachyuran family from Chiapas, Mexico, new hypothesis on Lecythocaridae Schweitzer & Feldmann, 2009, and phylogenetic implications (Crustacea, Decapoda, Brachyura, Eubrachyura)
FIG. 9. — Archaeochiapasa mardoqueoi n. gen., n. sp., male 10.3 × 11.1 mm, holotype (IHNFG-5616): A, close-up of front and rostrum; B, close-up of posterior portion of carapace. Abbreviations: a1-a3, pleonal somites 1-3; p.c., concave posterior border of carapace; P, reduced P4 or P5; ro, rostrum. Scale bars: A, 2 mm; B, 2.5 mm.
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