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Tytuł:
An integrative description of a new species of marine water bear (Heterotardigrada: Echiniscoididae) from the tidal zone of the east coast of Korea
Autorzy:
Kim, J.
Kihm, J.-H.
Han, S.
Kang, P.
Lee, H.
Gąsiorek, Piotr
Rho, H. S.
Jung, W.
Park, T.-Y. S.
Choi, J.
Opis:
Tardigrades, or water bears, are microscopic invertebrates renowned for their extraordinary resilience and cryptic diversity. Their microscopic size, paucity of taxonomically distinctive morphological characters and limited molecular data have caused significant taxonomic deflation. Echiniscoides, the most speciose genus in the family Echiniscoididae, also harbours multiple undescribed species. In this study, we describe a new marine tardigrade species, Echiniscoides testudolapis sp. nov. collected from barnacles inhabiting the intertidal zone of Uljin, Korea. The new species was characterized using an integrative taxonomic approach combining detailed morphological, morphometric and molecular analyses, including DIC microscopy, SEM microscopy and molecular phylogenetic reconstructions based on mitochondrial COI sequences. Morphologically, E. testudolapis sp. nov. is distinguished by its dorsal cuticular sculpturing in the form of circular discs with central punctations (weakly elevated processes), the presence of sensory organs on all legs (papilliform on legs I–II, IV and spike-like on legs III) and a dominant claw formula of 9,9,9,8. Notably, our COI analyses revealed substantial intraspecific genetic variability, with 20 haplotypes identified among 28 individuals (p-distances = 0.1–2.8%). In contrast, the examined nuclear markers exhibited low to no genetic variation (p-distances are 0.05%, 0%, 0.2–0.5% and 0.2–0.4% for 18S, 28S, ITS1 and ITS2, respectively). Single nucleotide polymorphism (SNP) analyses indicated that the observed COI polymorphisms are likely functionally neutral. These findings highlight the value of an integrative taxonomic approach in revealing cryptic diversity and provide new insights into the evolutionary processes and biogeographic patterns shaping marine tardigrade diversity.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
Extreme secondary sexual dimorphism in the genus Florarctus (Heterotardigrada: Halechiniscidae)
Autorzy:
Reinhardt Møbjerg, Kristensen
David Møbjerg, Kristensen
Gąsiorek, Piotr
Opis:
Secondary sexual dimorphism in florarctin tardigrades is a well-known phenomenon. Males are usually smaller than females, and primary clavae are relatively longer in the former. A new species Florarctus bellahelenae, collected from subtidal coralline sand just behind the reef fringe of Long Island, Chesterfield Reefs (Pacific Ocean), exhibits extreme secondary dimorphism. Males have developed primary clavae that are much thicker and three times longer than those present in females. Furthermore, the male primary clavae have an accordion-like outer structure, whereas primary clavae are smooth in females. Other species of Florarctus Delamare-Deboutteville & Renaud-Mornant, 1965 inhabiting the Pacific Ocean were investigated. Males are typically smaller than females, but males of Florarctus heimi Delamare-Deboutteville & Renaud-Mornant, 1965 and females of Florarctus cervinus Renaud-Mornant, 1987 have never been recorded. The Renaud-Mornant collection was re-examined, and type series were analysed. Florarctus heimi and F. cervinus were always found together in the coralline sand of Heron Island (Great Barrier Reef). The animals were kept alive and surveyed in the laboratory of the Queensland Museum. All studied individuals of the larger F. heimi (up to ca. 400 μm) were females, and all adults of the smaller F. cervinus (about 170 μm) were males. Males of F. cervinus were observed mating with females of F. heimi. Following those morphological and behavioural lines of evidence, we propose that F. cervinus is a junior synonym of F. heimi. Based on the discovery of dimorphism in F. bellahelenae sp. nov. and the strong sex-related morphological disparities in F. heimi, we suggest that extreme secondary dimorphism may be present in other florarctin arthrotardigrades.
Dostawca treści:
Repozytorium Uniwersytetu Jagiellońskiego
Artykuł
Tytuł:
A review on research studies of marine and brackish water meiofauna from Odisha, India
Autorzy:
Chatterjee, Tapas
Annapurna, Chandrabhotla
Guru, Bhikari Charan
Ingole, Baban
Tematy:
meiofauna
brackish marine water
Review
Odisha
India.
mejofauna
słonawa woda morska
przegląd
Indie.
Pokaż więcej
Wydawca:
Uniwersytet Szczeciński. Wydawnictwo Naukowe Uniwersytetu Szczecińskiego
Powiązania:
https://bibliotekanauki.pl/articles/1386288.pdf  Link otwiera się w nowym oknie
Opis:
In any marine system, meiofauna plays a key role in the functioning of the food web and sustain important ecological processes. Benthic research has long been carried out both in spatial and temporal scale on the distribution, species diversity, community structure and abundance. Very few works have been reported on meiofauna along Odisha coast during last few decades. The present work is aimed to review how much work has actually made along Odisha Coast, East Coast of India during last few decades.
W każdym systemie morskim mejofauna odgrywa kluczową rolę w funkcjonowaniu sieci pokarmowej odpowiadając za wiele ważnych procesów ekologicznych. Mimo prowadzenia od dawna szeroko zakrojonych badań bentosu w zakresie zmian rozmieszczenia, różnorodności gatunkowej, struktury społeczności i liczebności, niewiele wiadomo na temat mejofauny wschodniego wybrzeża Indii. Niniejsza praca ma na celu przedstawienie stanu wiedzy na temat mejofauny wybrzeża Odisha z ostatnich kilku dekad.
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 13

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