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55 results for “Eubrachyura”
FIG. 17 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. 17. — Retroplumidae Gill, 1894 (Retroplumoidea Gill, 1894). Costacopluma maroccana Ossó-Morales, Artal & Vega, 2010, Calcaires à slumps de Taghit Formation, late Campanian, Merija, Morocco: thoracic sternum and pleon. AO39, Private Collection Àlex Ossó. Photography by Àlex Ossó and courtesy of À. Ossó. Scale bar: 10 mm.
FIG. 1 in New occurrences of crabs (Decapoda, Brachyura, Eubrachyura) in the Pliocene of Florida (United States)
FIG. 1. — Location map of the two fossiliferous localities of the Pliocene Tamiami Formation in Sarasota County, Florida (United States). Locality A: SMR Aggregates quarry (27°20'05"N, 82°19'58"W). Locality B: Old APAC Shell quarry (27°14'18"N, 82°27'11"W). Maps modified after different sources and ViaMichelin.
FIG. 2 in New occurrences of crabs (Decapoda, Brachyura, Eubrachyura) in the Pliocene of Florida (United States)
FIG. 2. — Persephona cf. P. subovata (Rathbun, 1893), USNM PAL 720104 from the Pinecrest Member of Tamiami Formation (middle Piacenzian, Pliocene) of locality A in Sarasota County, Florida (United States): A, dorsal view; B, frontal view; C, left lateral view; D, posterior view. Scale bar: 10 mm. Photographs by À. Ossó.
FIG. 3 in New occurrences of crabs (Decapoda, Brachyura, Eubrachyura) in the Pliocene of Florida (United States)
FIG. 3. — Paractaea cf. P. nodosa (Stimpson, 1860), USNM PAL 720105 from the Pinecrest Member of Tamiami Formation (middle Piacenzian, Pliocene) of locality B in Sarasota County, Florida (United States): A, dorsal view; B, frontal view; C, posterior view. Scale bar: 10 mm. Photographs by À. Ossó.
FIGURE 4 in On the systematic placement of Montezumellidae Ossó & Domínguez, 2013 (Decapoda: Brachyura: Eubrachyura)
FIGURE 4. Extant species of Cheiragonoidea. A, D Erimacrus isenbecki (Brandt, 1848), female, MNHN-IU-2017–9089 (= MNHN-B5404). B Telmessus acutidens (Stimpson, 1858), female, MNHN-IU-2017–9086 (= MNHN-B5408). C, E Telmessus cheiragonus (Tilesius, 1812); C, male, MNHN-IU-2017-9095 (= MNHN-B5410); E, female, MNHN-IU-2017–9097 (= MNHN-B5445). Abbreviations. a: basal antennular article; ab: basal antennal article 2+3; ex, exopod of mxp3; is: ischium of mxp3; me: merus of mxp3; ml= median line; pb= press button; pl= pleopods; v= vulvae. ©MNHN-À.Ossó.
FIGURE 3 in On the systematic placement of Montezumellidae Ossó & Domínguez, 2013 (Decapoda: Brachyura: Eubrachyura)
FIGURE 3. Extant species of Cancroidea. A, D, H Cancer pagurus Linnaeus, 1758, male MNHN-IU-2017–9094 (= MNHN- B6388). B, F Atelecyclus rotundatus (Olivi, 1792), male MNHN-IU-2017–9085 (= MNHN-B5424). C, E, G Atelecyclus undecimdentatus (Herbst, 1783), male, MNHN-IU-2017-9091 (= MNHN-B30431). I A. undecimdentatus female MNHN-IU- 2017–9092 (= MNHN-B5432). Abbreviations. a: pleonal somites; aa: basal antennular article; ab: basal antennal article 2+3; a: pleonal somites; ep: epistome; ex: exopod of mxp3; is: ischium of mxp3; me: merus of mxp3; ml: median line; pb: press button; pr: proepistome; st: thoracic sternites; t: telson; v: vulvae. ©MNHN-À.Ossó.
FIGURE 2. A in On the systematic placement of Montezumellidae Ossó & Domínguez, 2013 (Decapoda: Brachyura: Eubrachyura)
FIGURE 2. A: Montezumella sp., MGB 59626, male ventral view, Lutetian (Middle Eocene), Vic zone, Osona (Catalonia). B: Moianella cervantesi Ossó & Domínguez, 2013, holotype, MGB 59624, dorsal view, Priabonian (late Eocene), Moià, Bages (Catalonia). C: Montezumella amenosi Vía, 1959, holotype, MGSB 16313, ventral view, Collbàs Fm., Bartonian (Middle Eocene), Carme, Anoia (Catalonia). D: Montezumella sp., MGB 59627, female ventral view showing the vulvae, Lutetian (Middle Eocene), Vic zone, Osona (Catalonia). E: Montezumella sp., MGB 59629, female ventral view, with pleon, Bartonian (Middle Eocene), Huesca, Aragón (Spain). F, G: Moianella cervantesi Ossó & Domínguez, 2013, MGB 87858, female, Priabonian (Late Eocene), Moià, Moianès (Catalonia); F: ventral view, with pleon. G: close up of the press button. Abbreviations, a: pleonal somites; ml: median line; pb: press button; st: thoracic sternites; t: telson; v: vulvae. Scale bar = 1cm.
FIGURE 1. A in On the systematic placement of Montezumellidae Ossó & Domínguez, 2013 (Decapoda: Brachyura: Eubrachyura)
FIGURE 1. A: Montezumella amenosi Vía, 1959, holotype MGSB 16313, dorsal view, Collbàs Fm., Bartonian (Middle Eocene), Carme, Anoia (Catalonia). B: Moianella cervantesi Ossó & Domínguez, 2012, holotype MGB 59624 dorsal view, Priabonian (late Eocene), Moià, Moianès (Catalonia). C–D: Montezumella amenosi, MGB 88019, Collbàs Fm., Bartonian (Middle Eocene), La Pobla de Claramunt, Anoia (Catalonia); C: ventral view; D; frontal view. Abbreviations, a: pleonal somite; aa: basal antennular article; ab: basal antennal article 2+3; ca: carpus; cmxp3: coxa of third maxilliped; en: endostome; ep: epistome; ex exopod of mxp3; ey: eyestalk; is: ischium of mxp3; ma: mandibles; me: merus of mxp3; mxp3: third maxilliped; pr: proepistome; ua: urinary article of antenna. Scale bar = 1cm.
Figure 28 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 28. Phylogenetic relationship of the Thoracotremata, based on Tsang et al. (2014), with the condition of the pleon-holding mechanism observed in adult males in this study (black) or reported in the literature (grey: Guinot and Bouchard, 1998; Bouchard, 2000) noted. Square: sternal button; circle: pleonal socket; f: functional; nf: non-functional:?: unknown. Figure filled: structure present; figure empty: structure not present; figure half filled: mixed character states within the family; e: alternative attachment system involving an edge (sternite 4) present.
Figure 27 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 27. Phylogenetic relationship of the true freshwater crabs and closely-related brachyuran families, based on Tsang et al. (2014), with the condition of the pleon-holding mechanism observed in adult males in this study (black) or in the literature (grey: Guinot and Bouchard, 1998; Bouchard, 2000; Castro et al., 2010; Ng and Castro, 2016) noted. Square: sternal button; circle: pleonal socket; f: functional; nf: non-functional. Figure filled: structure present; figure empty: structure not present.
Figure 24 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 24. Pleon-holding mechanism of Sesarmidae. a-c: Metasesarma obesum (Dana, 1851), ♂, 14 × 12 mm, Nikobar Islands (ZMK, uncatalogued). (a) Complete specimen in ventral view. (b) Same specimen, both pleon segment 6 and telson virtually removed. (c) Specimen on its back, view from posterior. Telson inside sterno-abdominal cavity, arrow indicates overhanging edge. d-e: Parasesarma plicatum (Latreille, 1803), ♂, 21 × 18 mm, Hongkong (ZMK1507). (d) Specimen in ventral view, both pleon segment 6 and telson highlighted. (e) Both pleon segment 6 and telson removed, sharp edge on 4 marked red. Orange: telson; red: sharp edge of sterno-abdominal cavity; yellow: pleon segment 6. Scale bar = 5 mm.
Figure 26 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 26. Pleon-holding mechanism of Ocypodidae. a-b: Leptuca festae (Nobili, 1902), ♂, 14 × 9 mm, El Salvador (SMF2012a). (a) Thoracic sternum without pleon, edge of pleonal clasping apparatus visible. (b) Ventral surface of pleon, notch formed by both pleon segment 6 and telson indicated. c-d: L. festae, ♀, El Salvador (SMF44017). (c) Thoracic sternum of female without eggs (14 × 9 mm), pleon visible at bottom of picture. (d) Female carrying eggs (12 × 8 mm), structures of pleonal clasping apparatus cannot come into contact. e-f: Ocypode gaudichaudii H. Milne Edwards & Lucas, 1843, ♂, 36 × 30 mm, Peru (ZMK1929). (e) Right thoracic sternum without pleon, setal tuft on sternite 5 visible. (f) Ventral surface of pleon. A: anterior; ca: clasping apparatus (sternal portion); E: eggs; fl: flat surface of pleon segment 6; G: gonopods; i: intestine; n: notch; P: posterior; s: setae; sac: sterno-abdominal cavity; st: setal tuft; S5: sternite 5; t: telson. Scale bar = 1 mm.
Figure 23. Sesarmidae. a-b in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 23. Sesarmidae. a-b: Neosarmatium trispinosum Davie, 1994, ♀, 8 × 8 mm, Australia (AM P.68315). (a) Thoracic sternum with pleon in folded position. (b) Thoracic sternum without pleon, small sternal button visible. c-d: Perisesarma messa (Campbell, 1967), ♀, 13 × 11 mm, Australia (AM P.64802). (c) Thoracic sternum without pleon. (d) Ventral surface of the pleon. B: button; ed: edge; n: notch; pl: pleopods; P6: pleon segment 6; s: setae; sac: sterno-abdominal cavity; S5: sternite 5; t: telson; v: vulva. Scale bar = 2 mm.
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.
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.
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.
Figure 25. 3D in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 25. 3D volume and surface reconstruction of the pleon-clasping apparatus of the ocypodid Minuca rapax (Smith, 1870) from µCT images, ♂, 22 × 17 mm, Honduras (SMF25820). (a) Complete specimen in three-quarter view. Scale bar = 5 mm. (b) Pleon in latero-ventral view. Arrow indicates notch of telson. Scale bar = 1 mm. (c) Thoracic sternum, edge of sterno-abdominal cavity marked. G: gonopods; orange: telson; red: edge of sterno-abdominal cavity: yellow: pleon segment 6 & 5. Scale bar = 5 mm.
Figure 18 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 18. Pleon-holding mechanism of a juvenile Gecarcinus lateralis (Guérin, 1832), ♀, 16 × 13 mm, Mexico (ZMK1694). 3D surface reconstruction from µCT images. (a) Ventral view of complete specimen. (b) View from posterior, telson underneath overhanging edge of sternoabdominal cavity. (c) View from posterior, both telson and pleon segment 6 virtually removed. Arrows in b and c indicate sharp overhanging edge of sterno-abdominal cavity. Orange: telson; red: edge; yellow: pleon segment 6. Scale bar = 3 mm.
Figure 15 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 15. Pleon-holding mechanism of Pseudothelphusidae. a-b: Hypolobocera chilensis (Lucas in H. Milne Edwards & Lucas, 1844), ♂, 70 × 41 mm, Dominica (ZRC1998.5). (a) Thoracic sternum without pleon, small button visible. (b) Ventral surface of pleon, hook-like socket visible. c-e: Neopseudothelphusa fossor (Rathbun, 1898), ♂, 23 × 15 (ZMK1688), 3D volume and surface recronstruction from µCT images, holding mechanism not engaged. (c) Three-quarter view of complete specimen. Pleon not firmly attached, right button visible. (d) Same specimen, telson and pleon segment 6 removed. Both buttons visible inside sterno-abdominal cavity. (e) Specimen in frontal view, shift of non-fastened pleon indicated by arrow, right button visible. A: anterior; B: button; G: gonopods; i: intestine; P: posterior; s: setae; sac: sterno-abdominal cavity; so: socket; S5: sternite 5; t: telson. Orange: telson; red: buttons; yellow: pleon segments. Scale bar = 5 mm.
Figure 17 in The morphological and functional variability of pleon-holding mechanisms in selected Eubrachyura (Crustacea: Decapoda)
Figure 17. Pleon-holding mechanism of Grapsidae. a-b: Metopograpsus latifrons (White, 1847), ♂, 29 × 27 mm, Malaysia (ZRC2012.0692). (a) Thoracic sternum without pleon, half-moon-shaped buttons clearly visible. (b) Ventral surface of pleon. c-d: Metopograpsus frontalis Miers, 1880, ♂, 32 × 29 mm, Philippines (ZRC2004.0473). (c) Thoracic sternum without pleon. (d) Ventral surface of pleon. e-f: M. frontalis Miers, 1880, ♀, 29 × 25 mm, Philippines (ZRC2004.0473). (e) Thoracic sternum without pleon. (f) 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.
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