Find research datasets worth reusing
Search datasets from major research repositories and use ShareScore to quickly assess how well each record supports discovery, access, and reuse.
1,021
datasets available to search
ShareScore release 0.9.0
Dataset results
1,021 results for “freshwater crabs”
Data from: Conflicting evolutionary patterns due to mitochondrial introgression and multilocus phylogeography of the Patagonian freshwater crab Aegla neuquensis
BACKGROUND: Multiple loci and population genetic methods were employed to study the phylogeographic history of the Patagonian freshwater crab Aegla neuquensis (Aeglidae: Decopoda). This taxon occurs in two large river systems in the Patagonian Steppe, from the foothills of the Andes Mountains east to the Atlantic Ocean. METHODOLOGY/PRINCIPAL FINDINGS: A nuclear phylogeny and multilocus nested clade phylogeographic analysis detected a fragmentation event between the Negro and Chico-Chubut river systems. This event occurred approximately 137 thousand years ago. An isolation-with-migration analysis and maximum-likelihood estimates of gene flow showed asymmetrical exchange of genetic material between these two river systems exclusively in their headwaters. We used information theory to determine the best-fit demographic history between these two river systems under an isolation-with-migration model. The best-fit model suggests that the Negro and the ancestral populations have the same effective population sizes; whereas the Chico-Chubut population is smaller and shows that gene flow from the Chico-Chubut into the Negro is four times higher than in the reverse direction. Much of the Chico-Chubut system appears to have only been recently colonized while the Negro populations appear to have been in place for most of the evolutionary history of this taxon. CONCLUSIONS/SIGNIFICANCE: Due to mitochondrial introgression, three nuclear loci provided different phylogeographic resolution than the three mitochondrial genes for an ancient fragmentation event observed in the nuclear phylogeny. However, the mitochondrial locus provided greater resolution on more recent evolutionary events. Our study, therefore, demonstrates the need to include both nuclear and mitochondrial loci for a more complete understanding of evolutionary histories and associated phylogeographic events. Our results suggest that gene flow between these systems, before and after fragmentation was through periodic paleolakes that formed in the headwaters region. Fragmentation between the Negro and Chico-Chubut systems was driven by the disappearance of these paleolakes during the Patagonian Glaciation.
FIGURE 2. G1 in Amamiku, a new genus for the true freshwater crab, Candidiopotamon amamense Minei, 1973 (Decapoda: Brachyura: Potamidae), from the Central Ryukyu Islands, Japan
FIGURE 2. G1 of Amamiku amamensis (Minei, 1973) and four species of three East Asian genera. A, Amamiku amamensis (Minei, 1973) (ZLKU m. 1086, holotype, CL 21.9 mm); B, Candidiopotamon rathbunae (De Man, 1914) (RUMFZC86, CL 37.0 mm); C, Candidiopotamon okinawense Minei, 1973 (ZLKU m.1104, holotype, CL 36.2 mm); D, Ryukyum yaeyamense (Minei, 1973) (ZLKU 13744, holotype, CL 36.2 mm); E, Geothelphusa obtusipes Stimpson, 1858 (NSMTCr. 9558, CL 17.3 mm); d, dorsal view; v, ventral view. Scales: A–D, 5mm; E, 2.5 mm.
FIGURE 2 A–C. Melothelphusa apiaka n in A new genus of freshwater crab of the tribe Kingsleyini Bott, 1970 (Crustacea: Decapoda: Brachyura: Pseudothelphusidae) with description of a new species from Mato Grosso, Brazil
FIGURE 2 A–C. Melothelphusa apiaka n. sp., male holotype, cl 18.8 mm, cw 27.8 mm (MZUSP 32914). Left first gonopod: A, abdominal view; B, lateral view; C, sternal view. Abbreviations: ap, apical plate; apa, abdominal process of apical plate; al, abdominal lobe; fas, field of apical spines; mp, marginal process; mep, mesial process; ml, marginal lobe; ms, marginal suture; oc, opening of spermatic channel; sap, subapical process. Scale bar 1 mm.
FIGURE 1 A–E. Melothelphusa apiaka n in A new genus of freshwater crab of the tribe Kingsleyini Bott, 1970 (Crustacea: Decapoda: Brachyura: Pseudothelphusidae) with description of a new species from Mato Grosso, Brazil
FIGURE 1 A–E. Melothelphusa apiaka n. sp., male holotype, cl 18.8 mm, cw 27.8 mm (MZUSP 32914). A, habitus, dorsal view. B, cephalothorax, ventral view. C, cephalothorax, frontal view. D, E, lateral view of right and left chelipeds, respectively. Abbreviations: CxP4, coxa of pereopod 4; G1, gonopod 1; G2, gonopod 2; St4–8, thoracic sternites 4 to 8. Scale bars A–E, 10 mm.
FIGURE 3 A–D. Melothelphusa apiaka n in A new genus of freshwater crab of the tribe Kingsleyini Bott, 1970 (Crustacea: Decapoda: Brachyura: Pseudothelphusidae) with description of a new species from Mato Grosso, Brazil
FIGURE 3 A–D. Melothelphusa apiaka n. sp., male holotype, cl 18.8 mm, cw 27.8 mm (MZUSP 32914). Left first gonopod: A, abdominal view. B, lateral view. C, sternal view. D, mesial view. Scale bar 1 mm.
FIGURE 3 in A new species of semi-terrestrial freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from the Central Highlands of Vietnam
FIGURE 3. Rathbunamon chumomrayense sp. nov., holotype, male (CW 23.0 mm), IEBR-FC KCx01. A, carapace, dorsal view; B, left third maxilliped; C, abdomen; D, anterior thoracic sternites of abdominal segments. Scale bar = 5 mm.
FIGURE 6. A–B in A new species of semi-terrestrial freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from the Central Highlands of Vietnam
FIGURE 6. A–B. Habitats near the specimen collection sites in Chu Mom Ray National Park, Kon Tum Province, Vietnam
FIGURE 5 in A new species of semi-terrestrial freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from the Central Highlands of Vietnam
FIGURE 5. Rathbunamon chumomrayense sp. nov., on the forest ground in Chu Mom Ray National Park, Kon Tum Province, Vietnam.
FIGURE 4 in A new species of semi-terrestrial freshwater crab (Crustacea: Decapoda: Brachyura: Potamidae) from the Central Highlands of Vietnam
FIGURE 4. Rathbunamon chumomrayense sp. nov., holotype, male (CW 23.0 mm), IEBR-FC KCx01. A–H, left G1: A, ventral view; B, ventral view of terminal segment; C, mesial view; D, mesial view of terminal segment; E, dorsal view; F, dorsal view of terminal segment; G, lateral view; H, lateral view of terminal segment; I, right G2; J, right G2 of terminal segment.
FIGURE 6 in On a new genus and species of freshwater crab from Vietnam, with comments on the nomenclatural status of Orientalia Dang, 1975 (Crustacea: Brachyura: Potamidae: Potamiscinae)
FIGURE 6. Laevimon tankiense (Dang & Tran, 1992). A, male abdomen; C, carapace; F, frontal area; G1, ventral view of left G1. Reproduced from Dang & Ho (2001: fig. 9).
FIGURE 3 in On a new genus and species of freshwater crab from Vietnam, with comments on the nomenclatural status of Orientalia Dang, 1975 (Crustacea: Brachyura: Potamidae: Potamiscinae)
FIGURE 3. Laevimon kottelati, new species. Holotype, male (45.1 by 33.4 mm) (ZRC 2004.695). A, outer view of left third maxilliped; B–E, right G1: B, dorsal view; C, ventral view; D, dorsal view of terminal segment; E, ventral view of terminal segment; F, dorsal view of left G2. Scales: 2.0 mm in A–C, F; 1.0 mm in D, E.
FIGURE 5 in On a new genus and species of freshwater crab from Vietnam, with comments on the nomenclatural status of Orientalia Dang, 1975 (Crustacea: Brachyura: Potamidae: Potamiscinae)
FIGURE 5. Laevimon tankiense (Dang & Tran, 1992). 1, dorsal view; 2, carapace; 3, frontal area; 4, ventral view of left G1; 5, male abdomen. Reproduced from Dang & Tran (1992: fig. 2).
FIGURE 2 in On a new genus and species of freshwater crab from Vietnam, with comments on the nomenclatural status of Orientalia Dang, 1975 (Crustacea: Brachyura: Potamidae: Potamiscinae)
FIGURE 2. Laevimon kottelati, new species. Holotype, male (45.1 by 33.4 mm) (ZRC 2004.695). A, dorsal view; B, frontal view; C, ventral view.
FIGURE 1 in On a new genus and species of freshwater crab from Vietnam, with comments on the nomenclatural status of Orientalia Dang, 1975 (Crustacea: Brachyura: Potamidae: Potamiscinae)
FIGURE 1. Laevimon kottelati, new species. Holotype, male (45.1 by 33.4 mm) (ZRC). Posterior thoracic sternum. Scale = 5.0 mm.
FIGURE 4 in On a new genus and species of freshwater crab from Vietnam, with comments on the nomenclatural status of Orientalia Dang, 1975 (Crustacea: Brachyura: Potamidae: Potamiscinae)
FIGURE 4. Laevimon tankiense (Dang & Tran, 1992). Holotype, male (40.0 by 26.4 mm) (VNCNST). A, dorsal view; B, frontal view; C, ventral view.
FIGURE 1 in Amamiku, a new genus for the true freshwater crab, Candidiopotamon amamense Minei, 1973 (Decapoda: Brachyura: Potamidae), from the Central Ryukyu Islands, Japan
FIGURE 1. Amamiku amamensis (Minei, 1973) and Candidiopotamon okinawense Minei, 1973. A, Amamiku amamensis (Minei, 1973); B, Candidiopotamon okinawense Minei, 1973; 1, photograph; 2, dorsal view; 3, frontal view. A1, RUMFZC99, male, CL 15.2 mm; A2, 3, ZLKUm. 1086, holotype, male, CL 21.9 mm; B1, RUMFZC154, male, CL 30.6 mm; B2, 3, ZLKU m. 1104, holotype, male, CL 36.2 mm. Scales: 10 mm.
FIGURES 16–17. Hydrothelphsua vencesi n in Hydrothelphusa vencesi, a new species of freshwater crab (Brachyura: Potamoidea: Potamonautidae) from southeastern Madagascar.
FIGURES 16–17. Hydrothelphsua vencesi n. sp., adult male holotype (cw 52 mm, ZMA De. 205976) from Vevembe, Fianarantsoa Province, Madagascar. 16, whole animal dorsal view; 17, detail of eyes and mouthparts, frontal view.
FIGURES 1–9. Hydrothelphsua vencesi n in Hydrothelphusa vencesi, a new species of freshwater crab (Brachyura: Potamoidea: Potamonautidae) from southeastern Madagascar.
FIGURES 1–9. Hydrothelphsua vencesi n. sp., adult male holotype (cw 52 mm, ZMA De. 205976) from Vevembe, Fianarantsoa Province, Madagascar. 1, carapace and eyes, dorsal view; 2, cephalothorax, carapace and eyes, frontal view; 3, right cheliped, frontal view; 4, left cheliped, frontal view; 5, carpus and merus of right cheliped, dorsal view; 6, merus of right cheliped, inferior view; 7, left third maxilliped; 8, sternum and abdomen; 9, abdomen pulled back to show first and second gonopods. Scale = 13 mm (1,2, 8, 9); 7 mm (3–7).
FIGURES 10–15. Hydrothelphsua vencesi n in Hydrothelphusa vencesi, a new species of freshwater crab (Brachyura: Potamoidea: Potamonautidae) from southeastern Madagascar.
FIGURES 10–15. Hydrothelphsua vencesi n. sp., adult male holotype (cw 52 mm, ZMA De. 205976) from Vevembe, Fianarantsoa Province, Madagascar. 10, right G1, ventral view; 11, right G1, dorsal view; 12, terminal article of right G1, dorsal view; 13, detail of tip of terminal article of right G1, dorsal view; 14, detail of tip of terminal article of right G1, dorsal view; 15, right first gonopod turned to show detail of tip of terminal article. Scale = 7 mm (10, 11); 2 mm (12–15).
FIGURES 9–11 in A new species of freshwater crab of the genus Microthelphusa (Brachyura: Pseudothelphusidae) from a remote isolated cloud forest on a tabletop mountain in western Guyana, South America
FIGURES 9–11. Microthelphusa meansi new species. Male holotype, cw 22.5 mm, from the Wokomung Massif, Guyana, USNM 1098373, left first gonopod. 9, caudal view; 10, lateral view; 11, cephalic view. Scale = 3.0 mm.
ScienceDex guides
Understand access before you commit
These curated guides explain access requirements, typical timelines, costs, and reuse considerations for widely used research datasets.
Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.