| 1. |
- Ahmed, Mohammed, et al.
(författare)
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Revision of the genus Cobbionema Filipjev, 1922 (Nematoda, Chromadorida, Selachinematidae)
- 2020
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Ingår i: European journal of taxonomy. - : Museum National D'Histoire Naturelle. - 2118-9773. ; 702, s. 1-34
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Tidskriftsartikel (refereegranskat)abstract
- This paper reports on the genus Cobbionema Filipjev, 1922 in Sweden with the description of four species and a revision of the genus. Cobbionema acrocerca Filipjev, 1922 is relatively small in size, with a tail that has a conical proximal and a digitate distal section. Cobbionema cylindrolaimoides Schuurmans Stekhoven, 1950 is similar to C. acrocerca in most characters except having a larger body size and heavily cuticularized mandibles. Cobbionema brevispicula sp. nov. is characterised by short spicules and a conoid tail. Cobbionema acuminata sp. nov. is characterised by a long two-part spicule, a conical tail and three (one mid dorsal and two ventrosublateral) sharply pointed tines in the anterior chamber of the stoma that are located more anterior than in all the other species. We also present a molecular phylogeny of the family based on the nearly full-length 18S and the D2-D3 expansion segment of the 28S rRNA genes. Maximum Likelihood and Bayesian trees inferred from both genes strongly support a clade that included Cobbionema, Demonema Cobb, 1894 and Halichoanolaimus de Man, 1888 and another clade with Gammanema Cobb, 1920 and Latronema Wieser, 1954 nested together. None of the trees supported the monophyly of the subfamilies Choniolaiminae and Selachinematinae.
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| 2. |
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| 3. |
- Boström, Sven
(författare)
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Antarktis okända små djur
- 2021
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Ingår i: Fauna och flora. - 0014-8903. ; 116:3, s. 40-48
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Tidskriftsartikel (populärvet., debatt m.m.)abstract
- Almost 370 samples were collected from three typesof habitats, viz. fellfield soils, mosses and ornithogenicsoils, on 14 mountain outcrops penetrating the ice sheet(nunataks) and one oasis in Dronning Maud Land, EastAntarctica. The samples were analyzed for metazoan microfauna(nematodes, rotifers and tardigrades). Studiesreveal that the populations of microfauna are patchilydistributed. Fauna composition of the microscopic animalswas found to vary greatly also among samples fromsimilar types of habitats. The presence of seemingly similarhabitable sites lacking microfauna and sites withdifferent combinations of animal taxa indicates that randomcolonization processes as well as local environmentaland historical factors might influence fauna compositionin specific habitable patches.
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| 4. |
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| 5. |
- Boström, Sven, et al.
(författare)
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Description of a new species of Paracrobeles Heyns, 1968 (Nematoda, Rhabditida, Cephalobidae) from Kelso Dunes, Mojave National Preserve, California, USA
- 2015
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Ingår i: European journal of taxonomy. - : Museum National D'Histoire Naturelle. - 2118-9773. ; 117, s. 1-11
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Tidskriftsartikel (refereegranskat)abstract
- A new species of Paracrobeles, P. kelsodunensis sp. nov. is described from the Kelso Dunes area, Mojave National Preserve, southern California. Paracrobeles kelsodunensis sp. nov. is particularly characterised by a body length of 469–626 μm in females and 463–569 μm in males; lateral field with four incisures, extending almost to tail terminus; three pairs of asymmetrical lips, separated by U-shaped primary axils with two long guarding processes, each lip usually with four tines along its margin; three long labial probolae, deeply bifurcated, with slender prongs without tines; metastegostom with a strong anteriorly directed dorsal tooth; pharyngeal corpus anteriorly spindle-shaped, posteriorly elongate bulbous with dilated lumen; spermatheca 24–87 μm long; postvulval uterine sac 60–133 μm long; vulva in a sunken area; spicules 33–38 μm long; and male tail with a 5–8 μm long mucro. The generic diagnosis is emended on the basis of recently described species and a key to the species of Paracrobeles is provided.
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| 6. |
- Boström, Sven, et al.
(författare)
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Description of Cribronema sturhani sp. n. (Nematoda, Rhabditida, Cephalobidae), a second species of a rare genus from Cameroon
- 2019
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Ingår i: Zootaxa. - : Magnolia Press. - 1175-5326 .- 1175-5334. ; 4695:2, s. 175-181
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Tidskriftsartikel (refereegranskat)abstract
- Specimens of a population of Cribronema collected in Cameroon are described as Cribronema sturhani sp. n. The new species resembles C. cribrum, which is the only species described in the genus, but it differs from it by the following features: a somewhat shorter tail in the females, longer spermatheca and postuterine vulval sac, tail terminus in females pointed vs. harpoon-shaped, and presence vs. absence of males.
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| 7. |
- Boström, Sven, et al.
(författare)
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Description of Drilocephalobus moldavicus Lisetskaya,1968 (Rhabditida: Osstellidae) from Kelso Dunes, Mojave National Reserve, California,USA
- 2018
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Ingår i: Zootaxa. - : Magnolia Press. - 1175-5326 .- 1175-5334. ; 4514:3, s. 438-444
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Tidskriftsartikel (refereegranskat)abstract
- Specimens of Drilocephalobus moldavicus are described from the Kelso Dunes area, Mojave National Preserve, southern California. This is the first record of the genus in North America. The specimens of this population are characterized by a body length of 322–417 µm in females and 403 µm in the male; cuticle finely annulated; lateral field with five incisures, extending to phasmid and two incisures extending almost to tail terminus in both sexes; lip region helmet-shaped, offset from body contour; lips amalgamated; stoma with thin walls lacking sclerotizations; pharynx without distinct divisions, cylindrical, widening slightly at about 1/3 of its length and basally, without valves; spermatheca 14–19 µm long; postvulval uterine sac 25–27 µm long; spicules 23 µm long; and female tail conoid-elongate with rounded terminus.
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| 8. |
- Boström, Sven, et al.
(författare)
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Descriptions of species of Stegelleta Thorne, 1938 (Nematoda, Rhabditida, Cephalobidae) from California, New Zealand and Senegal, and a revision of the genus
- 2014
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Ingår i: European journal of taxonomy. - : Museum National D'Histoire Naturelle. - 2118-9773. ; 87, s. 1-19
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Tidskriftsartikel (refereegranskat)abstract
- Populations of Stegelleta are described from California, New Zealand and Senegal. An amphimictic population from California is identified as belonging to S. incisa and compared with type specimens from Utah and an amphimictic population from Italy. One population from New Zealand is close to S. incisa but considered to represent a new species, Stegelleta laterocornuta sp. nov. It is particularly characterised by a 379–512 μm long body in females and 365–476 μm in males; cuticle divided into 16 rows of blocks at midbody (excluding lateral field); lateral field with four incisures; three pairs of asymmetrical lips, U-shaped primary axils without guarding processes, each lip asymmetrically rectangular with a smooth margin, only lateral lips have slender acute tines; three labial probolae, bifurcated at half of their length; vulva without flap; spermatheca 17–31 μm long; postuterine sac 7–24 μm long; spicules 21.5–23.5 μm long. Other specimens from New Zealand are identified as belonging to S. tuarua. A parthenogenetic population from Senegal is identified as belonging to S. ophioglossa and compared with type specimens from Mongolia and records of several other populations of S. ophioglossa. The generic diagnosis is emended and a key to the species of Stegelleta is provided.
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| 9. |
- Boström, Sven, et al.
(författare)
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Havsbottens mikroskopiska hajar
- 2022
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Ingår i: Fauna och flora. - 0014-8903. ; 117:1, s. 44-48
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Tidskriftsartikel (populärvet., debatt m.m.)
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| 10. |
- Boström, Sven
(författare)
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Kvalster - våra minsta husdjur
- 2022
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Ingår i: Fauna och flora. - 0014-8903. ; 117:1, s. 32-37
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Tidskriftsartikel (populärvet., debatt m.m.)
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