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454 results for “Decapods”
FIG. 2 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 2. — The Mahajanga Basin (Mahajanga Province) with fossil-bearing outcrops. Type localities: 1, Ctenocheles madagascariensis Secrétan, 1964; 2, Dromiopsis pulchella Secrétan, 1964; 3, Secretanella arcuata; 4, Hoploparia collignoni; 5, Notopocorystes bituberculatus; 6, Pustulina spinulata. Note that we do not show the type localities of H. sculpta and H. intermedia because Secrétan (1964) failed to designate holotypes for both species. Full species name are indicated in Table 1.
FIG. 3 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 3. — General map of the Morondava Basin (Tulear Province) subdivided into the three main sectors.
FIG. 25 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 25. — Reconstruction of Schlueteria menabensis Secrétan, 1964, by F. Fogliazza, right lateral view and detail of the inner surface of P1 chela.
FIG. 6 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 6. — Detail of the southern Morondava Basin with fossil-bearing outcrops. Type localities: 1,?Eryma australe; 2, Titanocarcinus mamillatus. Full species names are indicated in Table 1.
FIG. 4 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 4. — Detail of the northern Morondava Basin with fossilbearing outcrops. Type localities: 1, Eryma granuliferum and?Coleia incerta; 2, Eryma madagascariensis. Full species names are indicated in Table 1.
FIG. 16 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 16. — Line drawings of Hoploparia collignoni (Van Straelen, 1949), by F. Fogliazza, lateral views. Note differences in ornament of abdominal somites and first propodus that may be linked either to intraspecific variation or to sexual dimorphism.
FIG. 15 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 15. — Pereiopods of Hoploparia collignoni (Van Straelen, 1949) from the Albian of the Sitampiky region, eastern Mahavavy River, southern Mahajanga Basin: A-C, fragmentary chela (MNHN.F.R03942, Malandiandro, gisement 46), in lateral, dorsal and ventral views, respectively, ornament of lateral margins: outer margin (B) reinforced by a slightly tuberculate carina, inner margin (C) by a carina of two rows of aligned, strong spines; D-F, fragmentary chela (MNHN.F.R03952, syntype of Hoploparia sculpta, Malandiandro, gisement 42), in lateral, dorsal and ventral views, respectively, ornament of lateral margins: outer margin (E) reinforced by a slightly tuberculate carina, inner margin (F) by a carina of two rows of aligned,strong spines; G-I, fragmentary chela (MNHN.F.A31662, syntype of Hoploparia intermedia, Befamonto, gisement 42), in lateral, dorsal and ventral views, respectively, ornament of lateral margins: outer margin (H) reinforced by a carina of two rows of aligned, small spines, inner margin (I) by a carina of two rows of aligned, strong spines. Scale bars: 2 cm. Photographs by C. Lemzaouda (MNHN).
FIG. 11 in Revision of Mesozoic decapod crustaceans from Madagascar
FIG. 11. —?Eryma australe (Secrétan, 1964) from the lower Tithonian of the northern Analavelona Massif, southern Morondava Basin: A, B, holotype (MNHN.F.R03972, southwest of Ankilivalo, gisement 1153), fragmentary cheliped showing very large, compressed propodus with smooth outer margin (A), and strongly tuberculate inner margin (B); index and dactylus curved with occlusal opening very broad, note occlusal margin of index with one row of small rounded teeth and two strong basal tubercles of dactylus. Scale bars: 2 cm. Photographs by C. Lemzaouda (MNHN).
FIG. 3. — Urocaridella pulchella n in New records of alien decapods (Crustacea) from the Mediterranean coast of Turkey, with a description of a new palaemonid species
FIG. 3. — Urocaridella pulchella n. sp., Güvercin Ada, 1 ♂ holotype cl 5.7 mm: A, carapace, lateral aspect and detail of upper margin, (scale bar of the latter: 1 mm); B, abdomen, lateral aspect; C, first and second pereopods; D, chela of first pereopod. Scale bars:
FIG. 2. — A, B, Urocaridella pulchella n in New records of alien decapods (Crustacea) from the Mediterranean coast of Turkey, with a description of a new palaemonid species
FIG. 2. — A, B, Urocaridella pulchella n. sp.; A, Güvercin Ada, Kaş, 12 m depth, rocky bottom, night dive, VIII.2003; B, Kaş, 10-15 m depth, rocky bottom, night dive, XI.2003; C, Melicertus hathor (Burkenroad, 1959), Tatlisu Limani, 4 m depth, sand, night dive, IX.2002; D, Metapenaeopsis aegyptia Galil, 1990, Fakdere, Kaş, 4 m depth, Posidonia meadow, night dive, IX.2002; E, Carupa tenuipes Dana, 1851, Dalyan, Muğla, 8 m depth, in a cave, night dive, 30.X.1996; F, Charybdis (Charybdis) hellerii (A. Milne-Edwards, 1867), Tekirova, 7 m depth, rocky bottom, night dive, VIII.2001.
Supplementary data to: Internal anatomy of brachyuran crab from a Late Cretaceous methane seep and an overview of internal soft tissues in fossil decapod crustaceans
<p>001-Secretanella_sp_AAK_072019.zip - µCT scan data, 1.28 GB stack of DICOM images. High-resolution X-ray computed tomography (CT) scans of specimen ALMNH:Paleo:6522 were obtained at the Berkeley Preclinical Imaging Facility (UC Berkeley, California, USA) in July 2019 using a GE Healthcare eXplore Locus Micro CT Scanner. The specimen was scanned using a conebeam energy of 80 kV, a current of 450 µA, 2,000 ms exposure time, and no filter, resulting in a voxel resolution of 20.523 µm. Visualization and three-dimensional reconstruction of the resulting µCT data were performed using the open-source software 3D Slicer v.4.13.0 (Fedorov et al., 2012).</p> <p>Additional_images_gifs_3Dmodel.zip - archive containing 3 folders of additionnal images, video (gifs) and a 3D model (STL file) :</p> <p>- Addendum_Figure_3 : additional images / views to the figure 3 presented in the paper.</p> <p>- Gifs_3d_models : gifs and STL 3d model of the scanned specimen</p> <p>- Images_gifs_inc_gastric_musc : images, gifs and 3d model similar as in the other folders, but displaying potential gastric muscles</p>
Data from: A phylogenomic framework, evolutionary timeline and genomic resources for comparative studies of decapod crustaceans
Comprising over 15 000 living species, decapods (crabs, shrimp and lobsters) are the most instantly recognizable crustaceans, representing a considerable global food source. Although decapod systematics have received much study, limitations of morphological and Sanger sequence data have yet to produce a consensus for higher-level relationships. Here, we introduce a new anchored hybrid enrichment kit for decapod phylogenetics designed from genomic and transcriptomic sequences that we used to capture new high-throughput sequence data from 94 species, including 58 of 179 extant decapod families, and 11 of 12 major lineages. The enrichment kit yields 410 loci (greater than 86 000 bp) conserved across all lineages of Decapoda, more clade-specific molecular data than any prior study. Phylogenomic analyses recover a robust decapod tree of life strongly supporting the monophyly of all infraorders, and monophyly of each of the reptant, 'lobster' and 'crab' groups, with some results supporting pleocyemate monophyly. We show that crown decapods diverged in the Late Ordovician and most crown lineages diverged in the Triassic–Jurassic, highlighting a cryptic Palaeozoic history, and post-extinction diversification. New insights into decapod relationships provide a phylogenomic window into morphology and behaviour, and a basis to rapidly and cheaply expand sampling in this economically and ecologically significant invertebrate clade.
Fig. 2 in Evidence Of The Earliest Freshwater Decapod Fossil From Southeast Asia (Crustacea: Decapoda: Brachyura)
Fig. 2. Location of Vieng Phouka in northwestern Laos.
Fig. 3 in Evidence Of The Earliest Freshwater Decapod Fossil From Southeast Asia (Crustacea: Decapoda: Brachyura)
Fig. 3. Sedimentologic profile and fossil content of the Vieng Phouka coal mine.
Shared and distinct patterns of genetic structure in two sympatric large decapods
<p><em>Aim: </em>Comparing genetic structure in species with shared spatial ranges and ecological niches can help identify how dissimilar aspects of biology can shape differences in population connectivity. Similarly, where species are widely distributed across heterogeneous environments and major topographic barriers, knowledge of the structuring of populations can help reveal the impacts of factors that limit dispersal and/or drive divergence, aiding conservation management.</p> <p><em>Location: </em>European seas of the northeast Atlantic and Mediterranean.</p> <p><em>Taxa:</em> European clawed lobster (<em>Homarus gammarus</em>) and European crawfish (<em>Palinurus elephas</em>), two sympatric, heavily-fished decapods with extensive dispersal potential.</p> <p><em>Methods: </em>By RAD-sequencing 214 <em>H. gammarus </em>from 32 locations, and 349 <em>P. elephas </em>from 15 locations, we isolated 6,340 and 7,681 SNP loci, respectively. Using these data to characterise contemporary population structuring, we investigate potential spatial and environmental drivers of genomic heterogeneity.</p> <p><em>Results: </em>We found higher levels of differentiation among clawed lobsters than crawfish, both globally and within basins, and demonstrate where known hydrographic and topographic barriers generate shared patterns of divergence, such as a genetic break between the Atlantic and Mediterranean basins. Genetic structure not common to both species is principally apparent in the Atlantic portions of their range, where clawed lobster exhibits a genetic cline and increased differentiation towards range margins, while crawfish appear effectively panmictic throughout this region.</p> <p><em>Main Conclusions: </em>We attribute the comparative lack of crawfish population structuring to their greater dispersal tendencies via a longer pelagic larval duration and sporadic adult movements. In contrast, genetic connectivity in clawed lobster is relatively restricted, with the correlation of site of origin and temperature to geographic heterogeneity at many divergent loci indicative of both neutral and adaptive processes. Our results help inform how contemporary management can account for likely demographic connectivity and marry the conservation of genomic variation with sustainable fisheries in these ecologically and economically important crustaceans.</p>
Figure 2 in Freshwater Decapods of Godavari River, Bhadrachalam, Telangana
Figure 2. Line chart of species distribution in each sampling location.
Fossil Decapod (Homarus hakelensis)
**Ejemplar:** *Homarus hakelensis* **Edad:** 100´5-93´9 Ma. Cenomaniense (Cretácico superior) **Localidad:** Hadjoula (Líbano) **Dimensión ejemplar:** cm. **Descripción:** Ejemplar completo de conservación excepcional del Konservat-Lagerstätten del líbano. Ejemplar completamente articulado con preservación del abdomen con 5 segmentos más el telson., cabeza con ojos preservados, cresta rostral antenas, patas locomotoras y quelípedos **Sigla museo, colección y entidad:** colección Jose A. Villena **Técnica digitalización / modelo:** fotogrametria con cámara Sony DSC HX60V **Software y parámetros:** Metashape, 58 fotografías, calidad alta **Autor fotografías y procesado** Jose A. Villena Source: Objaverse 1.0 / Sketchfab
FIGURE 7 in Miocene decapod crustacean faunas from Cyprus - Part 1. Geographical-stratigraphical setting and Anomura
FIGURE 7. Carapace of Palmunidopsis muelleri, holotype (MAB13686). Scale bar is 2 mm.
FIGURE 3 in Miocene decapod crustacean faunas from Cyprus - Part 1. Geographical-stratigraphical setting and Anomura
FIGURE 3. Paguristes joecollinsi, holotype (MAB10456). Scale bar is 2 mm.
FIGURE 6 in Miocene decapod crustacean faunas from Cyprus - Part 1. Geographical-stratigraphical setting and Anomura
FIGURE 6. Carapace of Galathea weinfurteri (MAB11853). Scale bar is 2 mm.
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