cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.6084/m9.figshare.19672876
title: Cryptic diversity in non-geniculate coralline algae: a new genus <i>Roseolithon</i> (Hapalidiales, Rhodophyta) and seven new species from the Western Atlantic

description: Molecular studies have revealed cryptic diversity and polyphyly in the genus <i>Lithothamnion</i>. In this study we aimed to investigate the diversity and phylogeny of specimens that are morphologically described as <i>Lithothamnion</i> based on extensive collections along the Brazilian coast and an integrative taxonomic approach. Our results led to the proposal of <i>Roseolithon</i> gen. nov. belonging to the subfamily Melobesioideae. This new genus is described from the tropical north-western Atlantic and warm temperate south-western Atlantic specimens, based on phylogenetic analyses of <i>psb</i>A, <i>rbc</i>L-3P, COI-5P and SSU rDNA molecular markers, species delimitation methods, genetic divergence and morpho-anatomical observations. The integrative approach led us to find a set of morphological features that characterize <i>Roseolithon</i>: (i) thallus organization monomerous with plumose hypothallus (non-coaxial); (ii) flared epithallial cells; (iii) subepithallial cells varying in size and may be shorter, approximately equal to or longer than those subtending them; (iv) cells of adjacent filaments linked by fusions; (v) tetra/bisporangial conceptacle chambers multiporate; and (vi) the presence of pore canals bordered by rosette cells in depressions giving the surface a pitted appearance. Depending on the species, this pitted appearance occurs due to the sunken or disintegrated rosette cell roofs. The grade of the degeneration of the rosette cell roofs characterizes the species of this genus. The new genus <i>Roseolithon</i> is composed of at least 18 species, of which we describe seven new species: <i>Roseolithon tupii</i>, <i>R. tamoioi</i>, <i>R. tremembei</i>, <i>R. potiguarae</i>, <i>R. karaiborum</i>, <i>R. purii</i> and <i>R. goytacae.</i> Highlights Phylogenetic analyses revealed <i>Lithothamnion</i> to be a polyFphyletic genus.Integrative taxonomy enabled the description of a new genus <i>Roseolithon.</i>Morpho-anatomy does not reflect molecular phylogeny of non-geniculate coralline algae. Phylogenetic analyses revealed <i>Lithothamnion</i> to be a polyFphyletic genus. Integrative taxonomy enabled the description of a new genus <i>Roseolithon.</i> Morpho-anatomy does not reflect molecular phylogeny of non-geniculate coralline algae.
DOI: 10.6084/m9.figshare.19672876.v1
title: Cryptic diversity in non-geniculate coralline algae: a new genus <i>Roseolithon</i> (Hapalidiales, Rhodophyta) and seven new species from the Western Atlantic

description: Molecular studies have revealed cryptic diversity and polyphyly in the genus <i>Lithothamnion</i>. In this study we aimed to investigate the diversity and phylogeny of specimens that are morphologically described as <i>Lithothamnion</i> based on extensive collections along the Brazilian coast and an integrative taxonomic approach. Our results led to the proposal of <i>Roseolithon</i> gen. nov. belonging to the subfamily Melobesioideae. This new genus is described from the tropical north-western Atlantic and warm temperate south-western Atlantic specimens, based on phylogenetic analyses of <i>psb</i>A, <i>rbc</i>L-3P, COI-5P and SSU rDNA molecular markers, species delimitation methods, genetic divergence and morpho-anatomical observations. The integrative approach led us to find a set of morphological features that characterize <i>Roseolithon</i>: (i) thallus organization monomerous with plumose hypothallus (non-coaxial); (ii) flared epithallial cells; (iii) subepithallial cells varying in size and may be shorter, approximately equal to or longer than those subtending them; (iv) cells of adjacent filaments linked by fusions; (v) tetra/bisporangial conceptacle chambers multiporate; and (vi) the presence of pore canals bordered by rosette cells in depressions giving the surface a pitted appearance. Depending on the species, this pitted appearance occurs due to the sunken or disintegrated rosette cell roofs. The grade of the degeneration of the rosette cell roofs characterizes the species of this genus. The new genus <i>Roseolithon</i> is composed of at least 18 species, of which we describe seven new species: <i>Roseolithon tupii</i>, <i>R. tamoioi</i>, <i>R. tremembei</i>, <i>R. potiguarae</i>, <i>R. karaiborum</i>, <i>R. purii</i> and <i>R. goytacae.</i> Highlights Phylogenetic analyses revealed <i>Lithothamnion</i> to be a polyFphyletic genus.Integrative taxonomy enabled the description of a new genus <i>Roseolithon.</i>Morpho-anatomy does not reflect molecular phylogeny of non-geniculate coralline algae. Phylogenetic analyses revealed <i>Lithothamnion</i> to be a polyFphyletic genus. Integrative taxonomy enabled the description of a new genus <i>Roseolithon.</i> Morpho-anatomy does not reflect molecular phylogeny of non-geniculate coralline algae.
DOI: 10.6084/m9.figshare.14673279
title: Traits influence dinoflagellate C:N:P

description: Dinoflagellates are amongst the most abundant and diverse groups of plankton in surface waters and contribute to food web productivity and C:N:P biogeochemistry. Here we analyse the C:N:P of marine, autotrophic, planktonic dinoflagellates compiled from culture data from the scientific literature and test if dinoflagellate C:N:P differs from the Redfield ratio, and whether variability in C:N:P is associated with three traits: cell size, wall structure and toxin production. We find the average C:N:P of dinoflagellates is 90:12:1; higher in C:N, and lower in C:P and N:P than the canonical Redfield ratio. In aggregate the three traits examined here account for between 20–31% while taxonomic order accounts for between 37–38% of the variance in C:N:P. Smaller-sized and thecate taxa are higher in C:N, C:P and N:P than larger-size and athecate taxa. Species known to be able to produce C-rich toxins tend to be higher in C:P and N:P while species known to be able to produce N-rich toxins are lower in C:N, C:P and N:P relative to non-toxic species. These results indicate that any average estimate of dinoflagellate C:N:P will be influenced by the relative number of taxa with these traits.
DOI: 10.6084/m9.figshare.14673279.v1
title: Traits influence dinoflagellate C:N:P

description: Dinoflagellates are amongst the most abundant and diverse groups of plankton in surface waters and contribute to food web productivity and C:N:P biogeochemistry. Here we analyse the C:N:P of marine, autotrophic, planktonic dinoflagellates compiled from culture data from the scientific literature and test if dinoflagellate C:N:P differs from the Redfield ratio, and whether variability in C:N:P is associated with three traits: cell size, wall structure and toxin production. We find the average C:N:P of dinoflagellates is 90:12:1; higher in C:N, and lower in C:P and N:P than the canonical Redfield ratio. In aggregate the three traits examined here account for between 20–31% while taxonomic order accounts for between 37–38% of the variance in C:N:P. Smaller-sized and thecate taxa are higher in C:N, C:P and N:P than larger-size and athecate taxa. Species known to be able to produce C-rich toxins tend to be higher in C:P and N:P while species known to be able to produce N-rich toxins are lower in C:N, C:P and N:P relative to non-toxic species. These results indicate that any average estimate of dinoflagellate C:N:P will be influenced by the relative number of taxa with these traits.
DOI: 10.6084/m9.figshare.14718229
title: Detection of the widespread presence of the genus <i>Ansanella</i> along the Catalan coast (NW Mediterranean Sea) and the description of <i>Ansanella catalana</i> sp. nov. (Dinophyceae)

description: Many dinoflagellate groups have been overlooked because of their small size compared with their larger counterparts; consequently, little is known about their diversity, distribution, and contribution to the planktonic community. <i>Ansanella</i> is a recently described genus of small marine planktonic dinoflagellates belonging to the order Suessiales. In this study, morphological observations together with molecular SSU and LSU rDNA analyses of clonal strains from the Catalan coast (NW Mediterranean Sea) allowed the identification of <i>A</i>. cf. <i>natalensis</i> and a newly reported species, <i>Ansanella catalana</i>. The cells of <i>A. catalana</i> are oval and 9.6–15.5 μm long; the cell surface is covered with amphiesmal vesicles arranged in 10–13 latitudinal rows; the episome has an apical furrow complex with a single elongated apical vesicle; a type E eyespot is also present. This newly identified species can be distinguished from congeneric species by morphological details of the cell surface, the presence of mucocysts and an extrusome type not previously reported in dinoflagellates. The characterization of this structure could provide insights into extrusome evolution in dinoflagellates. Metabarcoding analysis of plankton and sediment samples from the Catalan coast revealed a wide distribution of <i>Ansanella</i> and the remarkable contribution of this genus to the dinoflagellate communities from three different coastal habitats. <b> Highlights</b> Members of <i>Ansanella</i> genus are widespread along the Catalan coast.A new species of the genus <i>Ansanella</i> (Dinophyceae) is described.A new type of extrusome was observed. Members of <i>Ansanella</i> genus are widespread along the Catalan coast. A new species of the genus <i>Ansanella</i> (Dinophyceae) is described. A new type of extrusome was observed.
DOI: 10.6084/m9.figshare.14718229.v1
title: Detection of the widespread presence of the genus <i>Ansanella</i> along the Catalan coast (NW Mediterranean Sea) and the description of <i>Ansanella catalana</i> sp. nov. (Dinophyceae)

description: Many dinoflagellate groups have been overlooked because of their small size compared with their larger counterparts; consequently, little is known about their diversity, distribution, and contribution to the planktonic community. <i>Ansanella</i> is a recently described genus of small marine planktonic dinoflagellates belonging to the order Suessiales. In this study, morphological observations together with molecular SSU and LSU rDNA analyses of clonal strains from the Catalan coast (NW Mediterranean Sea) allowed the identification of <i>A</i>. cf. <i>natalensis</i> and a newly reported species, <i>Ansanella catalana</i>. The cells of <i>A. catalana</i> are oval and 9.6–15.5 μm long; the cell surface is covered with amphiesmal vesicles arranged in 10–13 latitudinal rows; the episome has an apical furrow complex with a single elongated apical vesicle; a type E eyespot is also present. This newly identified species can be distinguished from congeneric species by morphological details of the cell surface, the presence of mucocysts and an extrusome type not previously reported in dinoflagellates. The characterization of this structure could provide insights into extrusome evolution in dinoflagellates. Metabarcoding analysis of plankton and sediment samples from the Catalan coast revealed a wide distribution of <i>Ansanella</i> and the remarkable contribution of this genus to the dinoflagellate communities from three different coastal habitats. <b> Highlights</b> Members of <i>Ansanella</i> genus are widespread along the Catalan coast.A new species of the genus <i>Ansanella</i> (Dinophyceae) is described.A new type of extrusome was observed. Members of <i>Ansanella</i> genus are widespread along the Catalan coast. A new species of the genus <i>Ansanella</i> (Dinophyceae) is described. A new type of extrusome was observed.
DOI: 10.6084/m9.figshare.14569004.v1
title: Evidence of late Palaeozoic and Middle Triassic magmatism in the Sakar-Strandzha Zone, SE Bulgaria: Regional geodynamic implications

description: Late Palaeozoic granitoids, meta-granitoids and meta-volcanic rocks predominate in the metamorphic basement of the northern and western parts of the Sakar-Strandzha Zone (SASTZ) in southeast Bulgaria, together with the subsidiary Triassic meta-granitoids and meta-volcanic rocks. Generally, igneous minerals and textures are preserved, except in the meta-granitoids and meta-volcanic rocks that experienced a low- to high-grade metamorphic overprint. The volcanic rocks have a peraluminous and high-K calc-alkaline composition, and the granitoids range between I- to S-type compositions, typical of volcanic arcs and syn-collisional settings. LILE and LREE-enrichment and Nb-Ta anomalies characterize the intrusive and extrusive rock suites. U-Pb zircon geochronology has yielded crystallization ages between 245 and 237 Ma for the majority of the studied igneous rocks, and between 297 and 295 Ma for a small group of igneous rocks. Early Permian and Middle Triassic igneous suites of the northern and western SASTZ have similar compositions and a similar tectonic setting when compared to Late Carboniferous-Early Permian intrusive and extrusive suites of the adjacent Sakar unit of the SASTZ, confirming a common regional late Palaeozoic-early Mesozoic tectono-magmatic event. As the Late Carboniferous-Permian to Middle Triassic magmatic arc components extend across the SASTZ, they trace the time-correspondent active continental margin along the Eurasian plate during subduction of the Paleotethys oceanic lithosphere. The late Palaeozoic Eurasian active continental margin magmatic arc evolution of the SASTZ can be linked with the Serbo-Macedonian-Rhodope zones to the southwest, where coeval meta-granitoids document the same geodynamic context. By contrast, the Triassic igneous suite of the SASTZ is unrelated to the Serbo-Macedonian-Rhodope zones, where Triassic meta-ophiolite and meta-granitoids record Neotethys rifting.
DOI: 10.6084/m9.figshare.14569004
title: Evidence of late Palaeozoic and Middle Triassic magmatism in the Sakar-Strandzha Zone, SE Bulgaria: Regional geodynamic implications

description: Late Palaeozoic granitoids, meta-granitoids and meta-volcanic rocks predominate in the metamorphic basement of the northern and western parts of the Sakar-Strandzha Zone (SASTZ) in southeast Bulgaria, together with the subsidiary Triassic meta-granitoids and meta-volcanic rocks. Generally, igneous minerals and textures are preserved, except in the meta-granitoids and meta-volcanic rocks that experienced a low- to high-grade metamorphic overprint. The volcanic rocks have a peraluminous and high-K calc-alkaline composition, and the granitoids range between I- to S-type compositions, typical of volcanic arcs and syn-collisional settings. LILE and LREE-enrichment and Nb-Ta anomalies characterize the intrusive and extrusive rock suites. U-Pb zircon geochronology has yielded crystallization ages between 245 and 237 Ma for the majority of the studied igneous rocks, and between 297 and 295 Ma for a small group of igneous rocks. Early Permian and Middle Triassic igneous suites of the northern and western SASTZ have similar compositions and a similar tectonic setting when compared to Late Carboniferous-Early Permian intrusive and extrusive suites of the adjacent Sakar unit of the SASTZ, confirming a common regional late Palaeozoic-early Mesozoic tectono-magmatic event. As the Late Carboniferous-Permian to Middle Triassic magmatic arc components extend across the SASTZ, they trace the time-correspondent active continental margin along the Eurasian plate during subduction of the Paleotethys oceanic lithosphere. The late Palaeozoic Eurasian active continental margin magmatic arc evolution of the SASTZ can be linked with the Serbo-Macedonian-Rhodope zones to the southwest, where coeval meta-granitoids document the same geodynamic context. By contrast, the Triassic igneous suite of the SASTZ is unrelated to the Serbo-Macedonian-Rhodope zones, where Triassic meta-ophiolite and meta-granitoids record Neotethys rifting.
DOI: 10.6084/m9.figshare.14854323
title: Neogene Kinematics of the Potwar Plateau and the Salt Range, NW Himalayan Front: A Paleostress Inversion and AMS study

description: We provide new kinematic data from the Potwar Plateau (Pakistan) to evaluate the tectonic evolution of the region during the Neogene. The plateau is bound by two major strike-slip faults in the west and the east, accommodating its southwards translation. We have recognized two Neogene deformation phases in the plateau, based on paleostress inversion and Anisotropy of Magnetic Susceptibility (AMS) tensors. The first phase lasted until the early Pliocene and was characterized by vertical minor stress and N-S compression, implying thrust tectonics. The second deformation phase is characterized by a near-vertical intermediate principal stress and near-horizontal major and minor stresses, interpreted to be associated with strike-slip tectonics since the late Pliocene. K<sub>int</sub> vectors from 21 sites are relatively compatible with the major principal stress orientations (σ<sub>1</sub>) and indicate two distinct domains. This is possibly because K<sub>min</sub> orientations are related to compaction, whereas K<sub>int</sub> orientations were always parallel to tectonic shortening and hence compression direction during both strike-slip (post-late Pliocene) and thrusting (pre-late Pliocene) phases. These phases are characterized by swapping of (σ<sub>2</sub>) and (σ<sub>3</sub>) orientations while (σ<sub>1</sub>) maintained its orientation. The most prominent change occurs at the western part of the Potwar Plateau, where major principal stress directions (σ<sub>1</sub>) and K<sub>int</sub> axes fan out south-westwards. The eastern domain is dominated by NE-SW trending folds and thrust faults, which are absent in the western domain. These structural features are interpreted to be the result of the distribution of deposits of the Neoproterozoic Salt Range Formation as a substratum below the Potwar Plateau. The Salt Range Formation is very thick and widespread in the west area and almost absent in the east. This factor led to unconstrained southwards gliding of the Potwar Plateau over the salt deposits in the west as opposed to frictional sliding and substantial internal deformation in the east.
DOI: 10.6084/m9.figshare.14740628
title: Early Cretaceous basalts record the modification of the North China Craton lithospheric mantle: implications for lithospheric thinning

description: The modification of the Archaean lithospheric mantle root beneath the eastern North China Craton (NCC) has been noticed. However, the degree of modification and the characteristics of metasomatic agents for the NCC lithospheric mantle are still unclear. Here, we compile the geochemistry and <sup>87</sup>Sr/<sup>86</sup>Sr and <sup>143</sup>Nd/<sup>144</sup>Nd isotope ratios of Cretaceous primitive basalts (Yixian, Sihetun, Fangcheng and Feixian) from the eastern NCC and estimate the inputs of subduction-related elements into the Archaean lithospheric mantle beneath the NCC. These basalts show primitive (high MgO, Cr and Ni contents) and arc-like geochemical features (enrichments in LILEs and depletions in HFSEs) that indicate that the mantle sources were modified by fluids related to subducted crustal materials. Substantial proportions of subduction-mobile elements (e.g. ~95% Ba and ~90% Th) transferred to the basalt sources via hydrous melts. Thus, a large volume of fluids transferred into the lithospheric mantle. The data support the model that the NCC Archaean lithospheric mantle was weakened by hydrous melts, which resulted in a fusible weakened lithospheric mantle. Preliminary lithospheric thinning was induced by the extension of the NCC resulting from trench retreat of the Paleo-Pacific plate at ~140-120 Ma. Then, decompression melting of the lithospheric mantle caused pervasive melts in the weakened lithospheric mantle, resulting in the lithospheric mantle having a low viscosity comparable to the asthenospheric mantle, which principally reduced the lithospheric mantle.
DOI: 10.6084/m9.figshare.14740628.v1
title: Early Cretaceous basalts record the modification of the North China Craton lithospheric mantle: implications for lithospheric thinning

description: The modification of the Archaean lithospheric mantle root beneath the eastern North China Craton (NCC) has been noticed. However, the degree of modification and the characteristics of metasomatic agents for the NCC lithospheric mantle are still unclear. Here, we compile the geochemistry and <sup>87</sup>Sr/<sup>86</sup>Sr and <sup>143</sup>Nd/<sup>144</sup>Nd isotope ratios of Cretaceous primitive basalts (Yixian, Sihetun, Fangcheng and Feixian) from the eastern NCC and estimate the inputs of subduction-related elements into the Archaean lithospheric mantle beneath the NCC. These basalts show primitive (high MgO, Cr and Ni contents) and arc-like geochemical features (enrichments in LILEs and depletions in HFSEs) that indicate that the mantle sources were modified by fluids related to subducted crustal materials. Substantial proportions of subduction-mobile elements (e.g. ~95% Ba and ~90% Th) transferred to the basalt sources via hydrous melts. Thus, a large volume of fluids transferred into the lithospheric mantle. The data support the model that the NCC Archaean lithospheric mantle was weakened by hydrous melts, which resulted in a fusible weakened lithospheric mantle. Preliminary lithospheric thinning was induced by the extension of the NCC resulting from trench retreat of the Paleo-Pacific plate at ~140-120 Ma. Then, decompression melting of the lithospheric mantle caused pervasive melts in the weakened lithospheric mantle, resulting in the lithospheric mantle having a low viscosity comparable to the asthenospheric mantle, which principally reduced the lithospheric mantle.
DOI: 10.6084/m9.figshare.14787443
title: Magma hybridization, mingling, and recycling in the Manzanillo plutonic complex, Mexican Cordillera

description: The Manzanillo Plutonic Complex (MPC) forms part of the Mexican Cordilleran plutonic belt at ~ 19°N. A special feature of the MPC is more than 125 km<sup>2</sup> outcrops of gabbroic rocks, thus constituting the largest body of this lithology along the belt. The overall MPC composition is heterogeneous including gabbros and granitoids with or without hybridization structures and minor alkali-rich granites. In contrast to other Cordilleran plutons, MPC intrusives are often strongly deformed and foliated heterogeneous structures with evidence of magma mingling and mixing. U-Pb emplacement and Rb-Sr and K-Ar cooling ages are between 59 and 73 Ma. Four U-Pb gabbro ages from 63 to 65 Ma define the peak of the hybridization event. Although geochemical analyses display considerable differences within MPC members, their Sr-Nd isotopic signatures are highly homogeneous with magmatic primitive εNd parameters between +5 and +6 and low <sup>87</sup>Sr/<sup>86</sup>Sr around 0.7035. Geothermobarometric data provide information for a hot environment for the gabbroic pulse at 3.4–4.9 Kb and &gt;900°C, indicative for depths ~15 km. On the other hand, granitoids show typical Cordilleran characteristics with lower temperatures and shallow emplacement conditions. The MPC shows a unique petrogenetic evolution in the Cordilleran arc; there is no evidence for a relation to other events such as the Early Cretaceous Alisitos arc.