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    Wyświetlanie 1-8 z 8
    Tytuł:
    The first record of the genus Bryodelphax (Tardigrada : Heterotardigrada : Echiniscidae) from Easter Island, Rapa Nui (Pacific Ocean, Chile) with the description of a new species, Bryodelphax aaseae
    Autorzy:
    Kristensen, Reinhardt M.
    Kaczmarek, Łukasz
    Michalczyk, Łukasz
    Opis:
    A new heterotardigrade, Bryodelphax aaseae sp. nov. is described from a small moss sample collected in the Rano Kau Crater on Easter Island (Rapa Nui) in 1989. The new species belongs to the group of species within the genus that have ventral plates. B. aaseae sp. nov. is similar to B. weglarskae (Pilato, 1972), B. sinensis (Pilato, 1974) and B. iohannis Bertolani, Guidi & Rebecchi, 1995 but differs from them mainly by a different number and arrangement of ventral plates. This is the first record of the genus Bryodelphax from Easter Island/Rapa Nui.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Pseudechiniscus in Japan : re-description of "Pseudechiniscus asper" Abe et al., 1998 and description of Pseudechiniscus shintai sp. nov.
    Autorzy:
    Gąsiorek, Piotr
    Kristensen, Reinhardt M.
    Vončina, Katarzyna
    Opis:
    The classification and identification of species within the genus Pseudechiniscus Thulin, 1911 has been considered almost a Sisyphean work due to an extremely high homogeneity of its members. Only recently have several contributions made progress in the taxonomy feasible through their detailed analyses of morphology and, crucially, by the re-description of the ancient, nominal species P. suillus (Ehrenberg, 1853). Herein, we focus on the Japanese representatives of this genus: P. asper, a rare species originally described from Hokkaido, and a new species P. shintai. Both taxa belong to the widespread suillus-facettalis complex. Detailed descriptions entailing DNA barcoding of four markers and illustrations of the ventral pillar patterns are indispensable for an accurate delineation of species within this genus.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Untangling the Echiniscus Gordian knot : Stellariscus gen. nov. (Heterotardigrada : Echiniscidae) from Far East Asia
    Autorzy:
    Lachowska-Cierlik, Dorota
    Gąsiorek, Piotr
    Michalczyk, Łukasz
    Suzuki, Atsushi C.
    Kristensen, Reinhardt M.
    Opis:
    Species constituting the family Echiniscidae are highly derived, armoured and inhabit terrestrial habitats, in contrast to other heterotardigrades that are predominantly marine. The genus Echiniscus C.A.S. Schultze, 1840, nominal for the family Echiniscidae, is currently the most speciose tardigrade genus. However, the great morphological variability, in comparison with other heterotardigrade genera, suggests the polyphyletic character of the genus. Here, we analyse new specimens of Echiniscus pseudelegans Séméria, 1994 collected in Japan and conclude that the species as well as two other related taxa, E. elegans Richters, 1907 and E. latifasciatus Dudichev and Biserov, 2000, represent a new genus, Stellariscus, gen. nov. The new genus is characterised by a mixture of peculiar morphological apomorphies: black eyes, star-like dorsal plate sculpturing, no trunk appendages (only cephalic cirri present), two types of ventral plates, and striking sexual dimorphism in both qualitative and quantitative traits. Morphological phylogeny of the family Echiniscidae suggests a close affinity between Stellariscus, Hypechiniscus Thulin, 1928 and Pseudechiniscus Thulin, 1911. The polyphyletic status of both Echiniscus and Testechiniscus Kristensen, 1987 is also inferred. The taxonomic significance of ventral armature in echiniscid phylogeny and taxonomy is discussed.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    New Asian and Nearctic Hypechiniscus species (Heterotardigrada: Echiniscidae) signalize a pseudocryptic horn of plenty
    Autorzy:
    Michalczyk, Łukasz
    Blagden, Brian
    Kristensen, Reinhardt M.
    Suzuki, Atsushi C.
    Oczkowski, Artur
    Nelson, Diane R.
    Bartels, Paul J.
    Gąsiorek, Piotr
    Opis:
    The cosmopolitan echiniscid genus Hypechiniscus contains exclusively rare species. In this contribution, by combining statistical morphometry and molecular phylogeny, we present qualitative and quantitative aspects of Hypechiniscus diversity, which remained hidden under the two purportedly cosmopolitan species: H. gladiator and H. exarmatus. A neotype is designated for H. gladiator from Creag Meagaidh (Scotland), and an informal re-description is provided for H. exarmatus based on animals from Creag Meagaidh and the Isle of Skye (Inner Hebrides). Subspecies/forms of H. gladiator are suppressed due to the high developmental variability of the cirrus dorsalis. At the same time, four species of the genus are described: H. daedalus sp. nov. from Roan Mountain and the Great Smoky Mountains (Southern Appalachian Mountains, USA), H. flavus sp. nov. and H. geminus sp. nov. from the Yatsugatake Mountains (Honshu, Japan), and H. cataractus sp. nov. from the Malay Archipelago (Borneo and the Moluccas). Dorsal and ventral sculpturing, together with morphometric traits, are shown to be the key characters that allow for the phenotypic discrimination of species within the genus. Furthermore, the morphology of Hypechiniscus is discussed and compared to that of the most similar genera, Pseudechiniscus and Stellariscus. Finally, a diagnostic key to all recognized Hypechiniscus species is provided.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Integrative taxonomy identifies Macrobiotus papei, a new tardigrade species of the Macrobiotus hufelandi complex (Eutardigrada : Macrobiotidae) from the Udzungwa Mountains National Park (Tanzania)
    Autorzy:
    Michalczyk, Łukasz
    Kristensen, Reinhardt Mobjerg
    Stec, Daniel
    Opis:
    In this paper we describe Macrobiotus papei, a new species of the Macrobiotus hufelandi complex from the Udzungwa Mountains National Park in Tanzania. Our research included the traditional morphology-based taxonomic analysis, supported by morphometrics, light and scanning electron microscopy imaging, as well as analysis of nucleotide sequences of three nuclear (18S rRNA, 28S rRNA, ITS-2) and one mitochondrial (COI) marker. The molecular sequences provided a more accurate description and independent verification of the taxonomic status of M. papei sp. nov. Such integrative approach requires a considerable number of individuals and eggs, which we obtained by establishing a laboratory culture of the new species. Our analyses revealed that M. papei sp. nov., by having the flexible filaments on the terminal discs of the egg processes, is most similar to Macrobiotus paulinae Stec et al., 2015 from Africa and Macrobiotus polypiformis Roszkowska et al., 2017 from South America. However, the new species can be easily distinguished from both these species by patches of cuticular granulation on the external and internal surface of legs I–III (only external patches present in in M. paulinae and M. polypiformis), two separate lateral transversal ridges with a rounded median tooth between instead of a single thin ventral transverse ridge in the third band of teeth in the oral cavity, smooth terminal discs and filaments on the egg processes (terminal discs and filaments covered by aggregations of small microgranules in M. paulinae and M. polypiformis), and by some morphometric characters of both adults and eggs.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
      Wyświetlanie 1-8 z 8

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