67 research outputs found
Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes
No full textAnush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell, Enrique Lara (2016): Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes. Cladistics 32: 606-623, DOI: 10.1111/cla.1216
Planocarina Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara, 2016, gen. nov.
No full textPlanocarina gen. nov. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara Description. Test elongated-pyriform, with a distinct neck, lateral margins tapering towards the aperture. A flat keel surrounds the entire posterior part of the test. Test hyaline or slightly yellowish, composed of circular to elongated shell plates probably recycled from euglyphid testate amoeba prey. Differential diagnosis. See diagnosis of Gibbocarina. Type species. Planocarina carinata (Archer 1867) Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara comb. nov. [syn.: Nebela carinata (Archer) Leidy, 1879]. Included taxa. We include in this genus all Nebela species with a flat keel, such as: N. carinata, N. marginata, N. maxima and N. spumosa, but excluding those with a lateral horn (i.e. the genus Cornutheca). Etymology. The name of the genus derives from the Latin words “planus” and “carina”, meaning flat keel, a characteristic trait for the members of the genus.Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on pages 621-622, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Longinebela Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara, 2016, gen. nov.
No full textLonginebela gen. nov. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara Description. Test elongated-pyriform, with a distinct neck, lateral margins (that can be straight or wavy) tapering towards the aperture. Test hyaline or slightly yellowish, composed of circular to elongated shell plates probably recycled from euglyphid testate amoeba prey. Differential diagnosis. See diagnosis of Gibbocarina. Type species. L. tubulosa (Penard, 1902) Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara comb. nov. Included taxa. We include here all Nebela taxa with an elongated test, such as: N. tubulosa, N. meisterfeldi, N. speciosa and N. golemansky. Etymology. The name of the genus refers to the elongated shape of these species and their otherwise similar morphology to the genus Nebela.Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 621, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Cornutheca Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara, 2016, gen. nov.
No full textCornutheca gen. nov. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara Description. Test elongated-pyriform, with a distinct neck, lateral margins tapering towards the aperture. Two lateral horns, pointing towards the posterior part of the test, either free or connected to the main part of the test by a lateral keel surrounding the posterior part of the test. Test hyaline or slightly yellowish, composed of circular to elongated shell plates probably recycled from euglyphid testate amoeba prey. Differential diagnosis. Members of this genus differ from other hyalospheniid genera in the presence of two lateral horns. Type species. Cornutheca ansata (Leidy, 1879) Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara comb. nov. Included taxa. We include in this genus all Nebela taxa bearing two lateral horns, such as N. ansata, N. saccifera and N. hippocrepis. Etymology. The name of the genus derives from the Latin words “cornus” and “theca”, meaning horns and shell, the traits that are characteristic for the members of the genus.Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 622, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Quadrulella madibai Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara, 2016, sp. nov.
No full textQuadrulella madibai sp. nov. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara Description. Test ovoid or pyriform, slightly elongated, with a rounded posterior end, laterally compressed towards the aperture. Test colourless, composed of square plates, regularly arranged in rows. The plates are smaller near the aperture (5 – 6 µm) then gradually become larger (9 – 11 µm) toward the posterior end of the test. Dimensions (based on five individuals) of the test: L = 83 – 91 µm, B = 37 – 45 µm. Aperture 21 – 23 µm wide, strongly curved and bordered by a thin organic lip. Differential diagnosis. See diagnosis of Q. symmetrica. Type locality. Pitse mire, a valley peatland in a landscape of upland grassland in the Welgevonden Game Park adjacent to Marakele national park, South Africa; 24 ° 24 I 29.3 II S; 0 27 ° 48 I 43.8 II E. Holotype. Fig. 4b. Etymology. This species was named to honour Nelson Mandela, the South African revolutionary and later president, who was called Madiba by his friends in reference to the name of his clan.Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 620, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Cornutheca ansata Leidy, 1879 Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara
No full textCornutheca ansata Leidy, 1879 Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara Description. Test pyriform in broad lateral view, laterally compressed, with a pair of hollow horns protruding, one on either side of the neck one-third of the distance from the pseudostome to the fundus. Test almost transparent or slightly yellowish – brownish, composed of small oval particles probably predated from small euglyphids. Dimensions: L = (195) 220 – 264 (270) µm, B (between the ends of the lateral horns) = (110) 130 – 150 (169) µm, B (of the main body) = 90 – 125 µm, horn length = 25 – 59 µm. Pseudostome = 40 – 55 µm, slightly curved in broad lateral view. Type. Plate 25, Figs 1 – 8 (Leidy, 1879).Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 622, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Mrabella subcarinata Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara, 2016, comb. nov.
No full textMrabella subcarinata comb. nov. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara 1957 Quadrulella subcarinata Gautier-Lièvre, Bull. Soc. Hist. Nat. Afr. Nord. t. 48: 500. Updated description. With characters of the genus. Dimensions (based on three individuals) of the test: L = 201 – 218 µm, B = 105 – 127 µm. Aperture 35 – 37.5 µm wide, curved and bordered by a think organic lip. Differential diagnosis. M. subcarinata is similar to Gibbocarina galeata in general shape of the test and in the presence of a wide, hollow, tuberous keel. Gibbocarina galeata is generally larger, but sizes overlap: L = 180 – 283 µm, B = 94 – 190 µm in G. galeata versus L = 201 – 218 µm, B = 105 – 127 µm in M. subcarinata. As far as we know, G. galeata never presents a shell composed entirely of rectangular plates, as is the case in M. subcarinata. M. subcarinata may be confused with M. plicata, which has a similar shape and keel, but it is smaller (L = 111 – 135 µm, B = 49 – 62 µm). Type. Fig. 4 b (Gauthier-Lièvre, 1957); paratype Fig. 7 a (present study).Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 621, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Quadrulella variabilis Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara, 2016, sp. nov.
No full textQuadrulella variabilis sp. nov. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara Description. Test ovoid or pyriform, with a rounded posterior end, laterally compressed towards the pseudostome, very similar to that in Q. symmetrica, sometimes with an elongated neck. Test colourless, composed of square plates, regularly arranged in rows. The plates are smaller near the aperture (3 – 4 µm), then gradually become larger (up to 7 – 9 µm) toward the posterior end of the test. Dimensions of the test (based on the seven sequenced individuals): length = 66 – 69 (96) µm, breadth = 35 – 40.5 (45) µm. Aperture 17 – 18.5 µm wide, often curved and bordered by a thin organic lip. Differential diagnosis. See diagnosis of Q. symmetrica. Type locality. The tests were collected from Sphagnum mosses in Le Cachot bog, Vallée de la Brévine, Canton of Neuchâtel, Switzerland (47.5 ° N, 6.4 ° E). Holotype. Fig. 2, paratype Fig. 7 d. Etymology. The species has members with a variable neck length. Notes. One other possibility is to describe the entire clade as Q. longicollis. However, given that we have only one Q. longicollis sequence (which may not correspond to the typical Q. longicollis, see Discussion), DNA of which was extracted from more than one cell, we would need additional data to understand whether the elongated neck is a result of phenotypic plasticity or a genetically fixed character.Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 620, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Quadrulella symmetrica (Wallich 1864) Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara
No full textQuadrulella symmetrica (Wallich 1864) Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell and Lara (Fig. 3) 1863 Difflugia proteiformis var. symmetrica Wallich, An. Mag. Nat. Hist. xii: 458. 1864 Difflugia pyriformis var. symmetrica Wallich, An. Mag. Nat. Hist. xiii: 232. 1864 Difflugia symmetrica Wallich, An. Mag. Nat. Hist. xiii: 245. 1871 Difflugia assulata Ehrenberg, Abh. Ak. Wis. Berlin: 249. 1871 Assulina assulata Ehrenberg, Abh. Ak. Wis. Berlin: 246. 1871 Difflugia carolensis Ehrenberg, Abh. Ak. Wis. Berlin: 250. 1871 Assulina leptolepis Ehrenberg, Abh. Ak. Wis. Berlin: 246, 274. 1875 Quadrula symmetrica Schulze, Arch. mik. Anat.: 329. (homonym) Updated description. Test ovoid or pyriform, with a rounded posterior end, laterally compressed towards the pseudostome. Test colourless, composed of square plates, regularly arranged in rows. The plates are smaller near the aperture (4 – 5 µm), then gradually larger (reaching up to 10 – 12 µm) towards the posterior end of the test. Test length = 72 – 85 µm, breadth = 40 – 46 µm. Pseudostome 20 – 23 µm wide, often curved and bordered by a thin organic lip. Differential diagnosis. Morphologically very similar to Q. variabilis, from which it differs by the dimension of the test and the size of scale plates (L = 72 – 85 µm, maximum plate size 10 – 12 µm in Q. symmetrica versus L = 66 – 69 µm, maximum scale size 7 – 9 µm). It can be discriminated from Q. madibai, which has plates of similar size, based on its less slender and elongated test (L/ B ratio is 2.0 – 2.3 in Q. madibai versus 1.7 – 1.9 in Q. symmetrica). Moreover, the general outline of the test in Q. madibai is globally more tubular and does not present a distinct neck. Our molecular data clearly separate these two species (sequence divergence up to 10%). Type. Fig. 16 in Wallich, 1863 An. Mag. Nat. Hist. XII. Notes. Q. symmetrica is found in wet mosses (Sphagnum or other), water streams, forest litter and soil, from all continents, except Antarctica. Detailed morphological and molecular observations are needed to clarify the true position of all described forms.Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 620, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
Arcellinida
No full textArcellinida Kent 1880 Hyalospheniidae (Schulze) Kosakyan et Lara 2012Published as part of Anush Kosakyan, Daniel J. G. Lahr, Matthieu Mulot, Ralf Meisterfeld, Edward A. D. Mitchell & Enrique Lara, 2016, Phylogenetic reconstruction based on COI reshuffles the taxonomy of hyalosphenid shelled (testate) amoebae and reveals the convoluted evolution of shell plate shapes, pp. 606-623 in Cladistics 32 on page 619, DOI: 10.1111/cla.12167, http://zenodo.org/record/23871
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