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50 results for “amphi-Atlantic”
Figure 1 in Amphi-Atlantic distribution of the Mancocumatinae (Cumacea: Bodotriidae), with description of a new genus dwelling in marine lava caves of Tenerife (Canary Islands)
Figure 1. Speleocuma guanche gen. et sp. nov. A, Ovigerous female, whole animal in lateral view. B, Adult male, whole animal in lateral view.
Figure 4 in Amphi-Atlantic distribution of the Mancocumatinae (Cumacea: Bodotriidae), with description of a new genus dwelling in marine lava caves of Tenerife (Canary Islands)
Figure 4. Speleocuma guanche gen. et sp. nov., ovigerous female. A, Right mandible. B, Pars incisa of the left mandible showing the lacinia mobilis. C, Maxillule. D, Maxilla. E, Maxilliped 1.
Figure 3 in Amphi-Atlantic distribution of the Mancocumatinae (Cumacea: Bodotriidae), with description of a new genus dwelling in marine lava caves of Tenerife (Canary Islands)
Figure 3. Speleocuma guanche gen. et sp. nov., ovigerous female A, Antenna 1. B, Maxilliped 2. C, Maxilliped 3. D, Pereopod 2. E, Pereopod 3. F, Pereopod 4. G, Last abdominal somite and uropod.
Figure 2 in Amphi-Atlantic distribution of the Mancocumatinae (Cumacea: Bodotriidae), with description of a new genus dwelling in marine lava caves of Tenerife (Canary Islands)
Figure 2. Speleocuma guanche gen. et sp. nov., preadult female, SEM micrographs. A, Anterior half of the carapace. B, Microstructure of the carapace showing the denticulate scales.
Figure 5 in Amphi-Atlantic distribution of the Mancocumatinae (Cumacea: Bodotriidae), with description of a new genus dwelling in marine lava caves of Tenerife (Canary Islands)
Figure 5. Speleocuma guanche gen. et sp. nov., adult male. A, Antennae 1 and 2. B, Mandible. C, Maxilula. D, Maxila. E, Maxilliped 2. F, Maxilliped 3. G, Pereopod 2. H, Pereopod 3. I, Pereopod 4. J, Pleopod. K, Uropod.
FIGURE 4 in Morphological and molecular analyses support the amphi-Atlantic distribution and taxonomic status of the snapping shrimp Alpheus intrinsecus Spence Bate, 1888 (Crustacea: Decapoda: Alpheidae)
FIGURE 4. Phylogenetic tree of Alpheus intrinsecus Spence Bate, 1888 and other species of Alpheus Fabricius, 1798 and Synalpheus Spence Bate, 1888, using the Maximum Likelihood analysis of 16S gene sequences. Numbers are support values for 670 bootstraps; values <50% were not included. Locality abbreviations—BA: Bahia; CS: Caribbean Sea; GMx: Gulf of Mexico; PA: Pará; PE: Pernambuco; SC: Santa Catarina; SP: São Paulo; RJ: Rio de Janeiro.
FIGURE 1. Alpheus intrinsecus Spence Bate, 1888 in Morphological and molecular analyses support the amphi-Atlantic distribution and taxonomic status of the snapping shrimp Alpheus intrinsecus Spence Bate, 1888 (Crustacea: Decapoda: Alpheidae)
FIGURE 1. Alpheus intrinsecus Spence Bate, 1888, male (A–C, G–J) and ovigerous female (D–F) Malhado Beach, Ilhéus, Bahia, Brazil (UESC 1571): A, frontal carapace and cephalic appendages, dorsal view; B, frontal carapace and cephalic appendages, lateral view; C, tooth on mesioventral carina of first segment of antennular peduncle, lateral view; D, left mandible, mesial view; E, first maxilla, lateral view; F, second maxilla, lateral view; G, first maxilliped, lateral view; H, second maxilliped, lateral view; I, third maxilliped, lateral view; J, telson and uropods, dorsal view. Scale bars = 1 mm.
Data from: Intraspecific genetic structure, divergence and high rates of clonality in an amphi-Atlantic starfish
Intraspecific genetic diversity and divergence have a large influence on the adaption and evolutionary potential of species. The widely distributed starfish, Coscinasterias tenuispina, combines sexual reproduction with asexual reproduction via fission. Here we analyse the phylogeography of this starfish to reveal historical and contemporary processes driving its intraspecific genetic divergence. We further consider whether asexual reproduction is the most important method of propagation throughout the distribution range of this species. Our study included 326 individuals from 16 populations, covering most of the species' distribution range. A total of 12 nuclear microsatellite loci and sequences of the mitochondrial cytochrome c oxidase subunit I (COI) gene were analysed. COI and microsatellites were clustered in two isolated lineages: one found along the south-western Atlantic and the other along the north-eastern Atlantic and Mediterranean Sea. This suggests the existence of two different evolutionary units. Marine barriers along the European coast would be responsible for population clustering: the Almeria-Oran Front that limits the entrance of migrants from the Atlantic to the Mediterranean, and the Siculo Tunisian strait that divides the two Mediterranean basins. The presence of identical genotypes was detected in all populations, although two monoclonal populations where found in two sites where annual mean temperatures and minimum values were the lowest. Our results based on microsatellite loci showed that intra-population genetic diversity was significantly affected by clonality whereas it had lower effect for the global phylogeography of the species, although still some impact on populations' genetic divergence could be observed between some populations.
Data from: Implications of isolation and low genetic diversity in peripheral populations of an amphi-Atlantic coral
Limited dispersal and connectivity in marine organisms can have negative fitness effects in populations that are small and isolated, but reduced genetic exchange may also promote the potential for local adaptation. Here, we compare the levels of genetic diversity and connectivity in the coral Montastraea cavernosa among both central and peripheral populations throughout its range in the Atlantic. Genetic data from one mitochondrial and two nuclear loci in 191 individuals show that M. cavernosa is subdivided into three genetically distinct regions in the Atlantic: Caribbean-North Atlantic, Western South Atlantic (Brazil) and Eastern Tropical Atlantic (West Africa). Within each region, populations have similar allele frequencies and levels of genetic diversity; indeed, no significant differentiation was found between populations separated by as much as 3,000 km, suggesting that this coral species has the ability to disperse over large distances. Gene flow within regions does not, however, translate into connectivity across the entire Atlantic. Instead, substantial differences in allele frequencies across regions suggest that genetic exchange is infrequent between the Caribbean, Brazil and West Africa. Furthermore, markedly lower levels of genetic diversity are observed in the Brazilian and West African populations. Genetic diversity and connectivity may contribute to the resilience of a coral population to disturbance. Isolated peripheral populations may be more vulnerable to human impacts, disease or climate change relative to those in the genetically diverse Caribbean-North Atlantic region.
FIGURE 5 in Description of Alpheus buckupi spec. nov., a new amphi-Atlantic snapping shrimp (Caridea: Alpheidae), based on morphological and molecular data
FIGURE 5. Phylogenetic tree of Alpheus buckupi spec. nov. and other species of Alpheus Fabricius, 1798 and Synalpheus Spence Bate, 1888, using Maximum Likelihood analysis of 16S gene sequences. Numbers are support values for 400 bootstraps; values <50% are not shown. Locality abbreviations—BA: Bahia; PE: Pernambuco; SP: São Paulo.
FIGURE 4 in Description of Alpheus buckupi spec. nov., a new amphi-Atlantic snapping shrimp (Caridea: Alpheidae), based on morphological and molecular data
FIGURE 4. Alpheus buckupi spec. nov.: A, male from Pacheco Beach, Caucaia, Ceará, Brazil (material not examined); B, paratype male from the confluence of the Pina and Capibaribe rivers, Recife, Pernambuco, Brazil (CCDB 3966), C, young male from Tassimirim Beach, Cairu, Bahia, Brazil (UESC 1521); D, female from Tassimirim Beach, Cairu, Bahia, Brazil (UESC 1521); E, ovigerous female from Moreré Beach, Cairu, Brazil (UESC 1522); F, male from Lagarto Beach, São Tomé and Príncipe (OUMNH). A–D, F: dorsal view; E: lateral view. Photographs: A, F: Arthur Anker; B–E: Alexandre O. Almeida.
FIGURE 3 in Description of Alpheus buckupi spec. nov., a new amphi-Atlantic snapping shrimp (Caridea: Alpheidae), based on morphological and molecular data
FIGURE 3. Alpheus buckupi spec. nov.: A–C, paratype, female (MZUSP 27549); D–K, holotype, male (MZUSP 27548): A; minor cheliped, lateral view; B, same, mesial view; C, same, dorsal view; D, second pereiopod, lateral view; E, third pereiopod, lateral view; F, same, dactylus and propodus, lateral view; G, fourth pereiopod, lateral view; H, same, ischium, lateral view; I, same, dactylus and propodus, lateral view; J, fifth pereiopod, lateral view; K, same, dactylus and propodus, lateral view. Scale bars: A–D, J = 2 mm; E–I, K = 1 mm.
FIGURE 1 in Description of Alpheus buckupi spec. nov., a new amphi-Atlantic snapping shrimp (Caridea: Alpheidae), based on morphological and molecular data
FIGURE 1. Alpheus buckupi spec. nov., holotype, male (MZUSP 27548): A, frontal region and cephalic appendages, dorsal view; B, detail of frontal region and proximal part of cephalic appendages, lateral view (frontal region slightly turned to the right); C, frontal region and cephalic appendages, lateral view; D, tooth on ventromesial carina of first segment of antennular peduncle, lateral view; E, scaphocerite, dorsal view (setae omitted); F, third maxilliped, lateral view; G, sixth abdominal segment, uropods and telson, lateral view; H, telson and uropods, dorsal view (setae omitted); I, detail of telson, dorsal view (setae omitted); J, right uropods, dorsal view (setae omitted). Scale bars: C, H = 2 mm; A, B, F, G, I, J = 1 mm; D, E = 0.5 mm.
FIGURE 2 in Description of Alpheus buckupi spec. nov., a new amphi-Atlantic snapping shrimp (Caridea: Alpheidae), based on morphological and molecular data
FIGURE 2. Alpheus buckupi spec. nov.: A–G, holotype, male (MZUSP 27548); H, paratype, female (MZUSP 27549): A, major cheliped, lateral view; B, same, mesial view; C, same, dorsal view; D, detail of major chela, lateral view; E, minor cheliped, lateral view; F, same, mesial view; G, same, dorsal view; H, detail of major chela, lateral view. Scale bars = 2 mm.
FIGURE 4 in Possible amphi-Atlantic dispersal of Scyllarus lobsters (Crustacea: Scyllaridae): molecular and larval evidence
FIGURE 4. Scyllarus subarctus, Phyllosoma final stage (PHMF 92). (A) ventral view, (B) dactylus of first pereiopod, (C) dactylus of second pereiopod, (D) dactylus of third pereiopod, (E) dactylus of fourth pereiopod, (F) left side of thorax, dorsal view, (G) detailed view of distal part of proximal exopod segment. Scale bars: A = 2 mm; B-F = 1 mm; G = 0.1 mm.
FIGURE 2 in Possible amphi-Atlantic dispersal of Scyllarus lobsters (Crustacea: Scyllaridae): molecular and larval evidence
FIGURE 2. Scyllarus subarctus, Phyllosoma stage VII (PHMF 13, PHMF 51). (A) ventral view, (B) dactylus of first pereiopod; (C) dactylus of second pereiopod, (D) dactylus of third pereiopod, (E) dactylus of fourth pereiopod. Scale bars: A = 1 mm; B-E = 500 µm.
FIGURE 3 in Possible amphi-Atlantic dispersal of Scyllarus lobsters (Crustacea: Scyllaridae): molecular and larval evidence
FIGURE 3. Scyllarus subarctus, Phyllosoma subfinal stage (PHMF 56, PHMF 48, SNECII-E89_02). (A) ventral view, (B) dactylus of first pereiopod, (C) dactylus of second pereiopod, (D) dactylus of third pereiopod, (E) dactylus of fourth pereiopod. Scale bars: A = 42 mm; B-E = 500 µm.
FIGURE 6 in Possible amphi-Atlantic dispersal of Scyllarus lobsters (Crustacea: Scyllaridae): molecular and larval evidence
FIGURE 6. Scyllarus subarctus, (A)–(C) maxilla and first maxilliped, (D)–(F) second maxilliped, (H)–(K) third maxilliped, (L)–(N) pleon and fifth pereiopod, ventral view, (O) pleopods of stage VII, subfinal and final stage respectively. Scale bars: A, B, D, H and I = 500 µm; C, E, F, G, L, M and O = 1 mm; N = 2 mm.
FIGURE 1 in Possible amphi-Atlantic dispersal of Scyllarus lobsters (Crustacea: Scyllaridae): molecular and larval evidence
FIGURE 1. Molecular Phylogenetic tree obtained by Maximum Likelihood. Only bootstrap support values above 80 are shown. Larval images adapted from Robertson (1968a, 1968b, 1971) and Palero et al. (2008, 2011).
FIGURE 9. Calcareous sponges from Florida with Amphi-Atlantic distribution. 1. Ascaltis panis. 2 in Calcareous sponges (Porifera, Calcarea) from Florida: new species, new records and biogeographical affinities
FIGURE 9. Calcareous sponges from Florida with Amphi-Atlantic distribution. 1. Ascaltis panis. 2. Arturia cf. canariensis. 3. Leucaltis clathria. (*) No site collection indicated. Only the Atlantic occurrences of A. cf. canariensis are being considered in this figure (see text and Table 5).
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