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1,198 results for “Crustaceans”
FIG. 6 in A re-appraisal of the middle-late Miocene fossil decapod crustaceans of the 'Faluns' (Anjou-Touraine, France)
FIG. 6. — Decapod from the 'Savignean facies' (Langhian) of 'La Sonneterie' quarry, Meigné-le-Vicomte (Maine-et-Loire): A-C, Necronectes michelini (A. Milne-Edwards, 1861), MHNH-2016-79-2003: A, ventral view; B, view of upper margin of chelipeds; C, frontal view of chelipeds. Decapods from the 'Savignean facies' (Langhian-Serravallian) of the 'Blandinerie' quarry, Breil (Maine-et-Loire): D-G, Xantho moldavicus (Yanakevich, 1977): D, ULB-IV-A (6), dorsal view; E, frontal view; F, ULB-IV-A (11), dorsal view; G, frontal view. Decapod from the probable Tortonian of Doué-la-Fontaine (Maine-et-Loire): H-I, Undetermined cheliped MNHN.F.B39266: H, outer margin; I, upper margin; J, inner margin. Scale bars: A-C, 50 mm; D-G, 5 mm; H-J 20 mm. Photographs of: A-C, by P. Saulet; D-J, by À. Ossó.
FIG. 1 in A re-appraisal of the middle-late Miocene fossil decapod crustaceans of the 'Faluns' (Anjou-Touraine, France)
FIG. 1. — Location map of the three quarries: 1, the marine Miocene outcrops; 2, the river network; 3, the 'Blandinerie' quarry (Breil); 4, the 'Sonneterie' quarry (Meigné-le-Vicomte); 5, the 'Noyant-la-Plaine' quarry (Doué-la-Fontaine).
Meta-analysis suggests variable, but pCO2-specific, effects of ocean acidification on crustacean biomaterials
Crustaceans comprise an ecologically and morphologically diverse taxonomic group. They are typically considered resilient to many environmental perturbations found in marine and coastal environments, due to effective physiological regulation of ions and hemolymph pH, and a robust exoskeleton. Ocean acidification can affect the ability of marine calcifying organisms to build and maintain mineralized tissue and poses a threat for all marine calcifying taxa. Currently, there is no consensus on how ocean acidification will alter the ecologically-relevant exoskeletal properties of crustaceans. Here, we present a systematic review and meta-analysis on the effects of ocean acidification on the crustacean exoskeleton, assessing both exoskeletal ion content (calcium and magnesium) and functional properties (biomechanical resistance and cuticle thickness). Our results suggest that the effect of ocean acidification on crustacean exoskeletal properties varies based upon seawater <i>p</i>CO<sub>2</sub> and species identity, with significant levels of heterogeneity for all analyses. Calcium and magnesium content were significantly lower in animals held at <i>p</i>CO<sub>2</sub> levels of 1500-1999 μatm as compared to those under ambient <i>p</i>CO<sub>2</sub>. At lower <i>p</i>CO<sub>2</sub> levels, however, statistically significant relationships between changes in calcium and magnesium content within the same experiment were observed: a negative relationship between calcium and magnesium content at <i>p</i>CO<sub>2</sub> of 500-999 μatm and a positive relationship at 1000-1499 μatm. Exoskeleton biomechanics, such as resistance to deformation (microhardness) and shell strength, also significantly decreased under <i>p</i>CO<sub>2</sub> regimes of 500-999 μatm and 1500-1999 μatm, indicating functional exoskeletal change coincident with decreases in calcification. Overall, these results suggest that the crustacean exoskeleton can be susceptible to ocean acidification at the biomechanical level, potentially predicated on changes in ion content, when exposed to high influxes of CO<sub>2</sub>. Future studies will need to accommodate the high variability of crustacean responses to ocean acidification, as well as ecologically-relevant ranges of <i>p</i>CO<sub>2</sub> conditions, when designing experiments with conservation-level endpoints. --
Supplementary information for 'Distinct gene expression dynamics in developing and regenerating crustacean limbs', by Sinigaglia et al.
<p>Supplementary data and code for the manuscript <em>'Distinct gene expression dynamics in developing and regenerating crustacean limbs'</em>, by Sinigaglia et al.</p>
Supplementary information for 'Crustacean leg regeneration restores complex microanatomy and cell diversity' by Almazán, Çevrim et al.
<p>Animals can regenerate complex organs, yet this frequently results in imprecise replicas of the original structure. In the crustacean <em>Parhyale</em>, embryonic and regenerating legs differ in gene expression dynamics but produce apparently similar mature structures. We examine the fidelity of <em>Parhyale </em>leg regeneration using complementary approaches to investigate microanatomy, sensory function, cellular composition and cell molecular profiles. We find that regeneration precisely replicates the complex microanatomy and spatial distribution of external sensory organs, and restores their sensory function. Single-nuclei sequencing shows that regenerated and uninjured legs are indistinguishable in terms of cell type composition and transcriptional profiles. This remarkable fidelity highlights the ability of organisms to achieve identical outcomes via distinct processes.</p>
simon-lledo/Ecology_deep sea mass crustacean falls_rawObservations
<p>Initial release following acceptance at <em>Ecology</em> of Simon-Lledó et al. <strong>Mass falls of crustacean carcasses link surface waters and the deep seafloor. </strong></p> <p>Data (.csv) contains:</p> <p>Location (Latitude/Longitude), Seascape type, Transect code, and Standard Carapace Length (SCL, mm) of the crustacean carcasses assessed to investigate the (abyssal) mass fall presented in the study.</p> <p> </p>
Fig. 14. The provannid gastropod Provanna antiqua Squires, 1995 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 14. The provannid gastropod Provanna antiqua Squires, 1995, from early Oligocene seep deposits at Cerro La Salina (block 1, A, F; block 4, H; block 6, B, C, D, G; block 8, E), Talara Basin, northern Peru. A. NRM Mo187044, specimen with distinctive axial and spiral sculpture, in abapertural view. B. NRM Mo187045, specimen with distinctive sculpture and showing the basal groove, in apertural view. C. NRM Mo187046, specimen with weak axial sculpture in the upper whorl, in apertural view. D. NRM Mo187047, fragmentary specimen with mainly spiral sculpture, in apertural view. E. NRM Mo187048, nearly smooth specimen showing slightly sinuous growth lines, in apertural view. F. NRM Mo187049, specimen with small shoulder and sculpture mainly in upper part of whorls, in apertural view. G. NRM Mo187050, specimen with faint axial and spiral sculpture, in apertural view. H. NRM Mo187051, two specimens with small shoulder and sculpture mainly in upper part of whorls..
Fig. 13 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 13. Neritimorpha indet. (PRI 80015) from the early Cenozoic Lomitos cherts seep deposits near Negritos, Talara Basin, northern Peru.
Fig. 17 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 17. Neogastropod and opisthobranch gastropods from early Oligocene seep deposits at Cerro La Salina (block 2, A; block 4, B; block 6, E; block 7, D) and Belén seep site (C), Talara Basin, northern Peru. A, B. The buccinid Colus sekiuensis Kiel and Goedert, 2007. A. Large specimen (NRM Mo187062), showing shape of last whorl. B. NRM Mo187063, fragment of an early whorl. C. Buccinidae indet. (NRM Mo187064), fragmentary specimen. D. NRM Mo187065, the opisthobranch "Acteon" sp. in apertural (D1) and lateral (D2) views. E. The opisthobranch Cylichna sp. (NRM Mo187066).
Fig. 10 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 10. The possible neomphalid Retiskenea? sp. (PRI 80014) from the early Cenozoic Lomitos cherts seep deposits near Negritos, Talara Basin, northern Peru.
Fig. 7 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 7. The vesicomyid Pleurophopsis talarensis sp. nov., from early Oligocene seep deposits at Cerro La Salina (block 6, A, D, F–H; block 7, E; block 9, B, C), Talara Basin, northern Peru. A. Holotype (NRM Mo187019), right valve showing shell outline. B. Paratype (NRM Mo187022), posteriorly damaged, articulated specimen; view on dorsal side (B1) and on right valve (B2). C. Paratype (NRM Mo187020), right valve with posterior tip missing. D. Paratype (NRM Mo187023), internal mold of left valve showing anterior adductor muscle scar and pallial line (D1), arrow indicates onset of pallial; close-up on hinge area (D2. E. Paratype (NRM Mo187021), semi-articulated specimen, view on incomplete right valve). F. Paratype (NRM Mo187024), anterior part of fight valve. G. Paratype (NRM Mo187026), anterior part of right valve (G1), view on hinge area (G2). H. Paratype (NRM Mo187025), hinge area of right valve.
Fig. 12 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 12. Vetigastropoda from early Oligocene seep deposits at Cerro La Salina (block 1, A, D; block 2, C; block 9, B) Talara Basin, northern Peru. A, B. The colloniid Cantrainea sp. A. NRM Mo187040, specimen with base embedded in rock matrix in lateral (A1), oblique (A2) and apical (A3) views. B. NRM Mo187041, specimen with exposed base in lateral (B1) and basal (B2) views. C, D. The trochoid incertae sedis. C. NRM Mo187042. D. NRM Mo187043.
Fig. 6. The vesicomyid Pleurophopsis lithophagoides Olsson, 1931 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 6. The vesicomyid Pleurophopsis lithophagoides Olsson, 1931, from the early Oligocene Belén seep site, Talara Basin, northern Peru. A. Specimen with strongly sloping posterodorsal margin (NRM Mo187014), left valve (A1), right valve (A2), and dorsal view (A3). B. Specimen with rather straight posterodorsal margin (NRM Mo187015), left valve (B1), right valve (B2), and dorsal view (B3). C. Large specimen (NRM Mo187016), left valve (C1), right valve (C2), and dorsal view (C3). D. Close-up on anterior side of left valve (NRM Mo187018), showing anterior adductor muscle scar and onset of pallial line. E. Internal mold showing hinge and anterior muscle scars (NRM Mo187017). Abbreviations: aams, anterior adductor muscle scar; aprm, anterior pedal retractor scar; cg, connecting grove between aams and aprs.
Fig. 8 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 8. The vesicomyids "Vesicomya" tschudi Olsson, 1931 (A–C, E) and "Vesicomya" ramondi Olsson, 1931 (D), from early Oligocene seep deposits in the Talara Basin, northern Peru. A. Small specimen (NRM Mo187029) from Cerro La Salina block 1, view on left valve (A1), dorsal view (A2), view on anterodorsal side showing lunular incision (A3, arrow). B. Medium-sized specimen (NRM Mo187030) from Cerro La Salina block 5, view on left valve (B1) and dorsal view (B2). C. Holotype (PRI 1965) from Pajarabobo, view on left valve showing posterior end of pallial line (arrow). D. Holotype (PRI 1962) from Pajarabobo, view on right valve. E. Large left valve (NRM Mo187031) from Cerro La Salina block 5, view of the outer side.
Fig. 5 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 5. The lucinid Lucinoma zapotalensis (Olsson, 1931) from early Oligocene seep deposit at Cerro La Salina (block 1, C; block 9, A) and Cerros El Pelado (block 2, B), Talara Basin, northern Peru. A. Internal mold of large left valve (NRM Mo187011), left valve showing anterior adductor muscle scar (arrow). B. NRM Mo187012, external sculpture on right valve. C. Articulated specimen (NRM Mo187013), showing external sculpture on left valve (C1) and lunule and ligament in dorsal view (C2).
Fig. 2 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 2. Protobranch and pteriomorph bivalves from early Oligocene seep deposits from the Cerro La Salina (block 1, A; block 6, D; block 9, C) and Belén seep deposit (B), Talara Basin, northern Peru. A. Malletiid Neilo altamirano sp. nov. (NRM Mo187001, holotype), internal mold in lateral view (A1); external mold in lateral view (A2), arrows indicating the posterior ridge; view on the dorsal side (A3); close-up on the taxodont hinge dentition (A4). B. The possible nuculid Acila? sp. (NRM Mo187002), external mold of outer shell surface. C. The bathymodiolin Idas sp. (NRM Mo187003), internal mold of the entire specimen (C1), arrow indicating the taxondont teeth; close-up on taxodont teeth on posterodorsal shell margin (C2). D. Propeamussiidae indet. (NRM Mo187004), uncoated specimen showing internal radial ridges (D1); specimen coated with ammonium-chloride, highlighting external sculpture (D2).
Fig. 1 in Mollusks and a crustacean from early Oligocene methane-seep deposits in the Talara Basin, northern Peru
Fig. 1. Locality map of the seep deposits in the Talara Basin in northern Peru, where the here described mollusk and crustacean taxa were found adopted from Kiel et al. 2019).
Figure 31 in New genera and species of sphaeromatid isopod crustaceans from Australian marine coastal waters
Figure 31. Moruloidea perionasus sp. nov. A–D, holotype, remainder male paratype, NMV J26202. A, dorsal view; B, lateral view; C, frons, ventral view; D, pleon, posterior margin, posterior view; E, antennule; F, antenna; G, maxilliped; H, penes.
Figure 40 in New genera and species of sphaeromatid isopod crustaceans from Australian marine coastal waters
Figure 40. Pedinura mokari sp. nov. A–D, holotype, remainder male paratype NMV J39721. A, dorsal view; B, lateral view; C, frons, ventral view; D, pleon and pleotelson, ventral view; E, antennule; F, antenna; G, maxilliped; H, left mandible; I, maxilla; J, maxillule.
Figure 37 in New genera and species of sphaeromatid isopod crustaceans from Australian marine coastal waters
Figure 37. Pedinura flindersia sp. nov. All figs male paratype NMV J39721. A–E, pleopods 1–5; F, uropod; G, penes.
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