1,723,951 research outputs found
Neoechinorhynchus (Hebesoma) personatus Tkach, Sarabeev et Shvetsova 2014, sp. n.
No full textNeoechinorhynchus (Hebesoma) personatus Tkach, Sarabeev et Shvetsova, sp. n. (fig. 12–18, table 3)Published as part of Tkach, Ie. V., Sarabeev, V. L. & Shvetsova, L. S., 2014, Taxonomic Status Of Neoechinorhynchus Agilis (Acanthocephala, Neoechinorhynchidae), With A Description Of Two New Species Of The Genus From The Atlantic And Pacific Mullets (Teleostei, Mugilidae), pp. 291-306 in Vestnik Zoologii 48 (4) on page 299, DOI: 10.2478/vzoo-2014-0035, http://zenodo.org/record/645318
Neosychnocotyle maggiae Snyder & Tkach 2007
No full textNeosychnocotyle maggiae Snyder & Tkach, 2007 Carettochelys insculpta (Reptilia); freshwater; intestine; AUS; Australia (Oceania) (Snyder & Tkach 2007). Remark: Type host; sequence of partial 18 S, ITS- 1, 5.8S, ITS- 2 and partial 28 S in the GenBank database EF015578. Emydura victoriae (Reptilia); freshwater; intestine; AUS; Australia (Oceania) (Snyder & Tkach 2007).Published as part of Alves, Philippe V., Vieira, Fabiano M., Santos, Cláudia P., Scholz, Tomáš & Luque, José L., 2015, A Checklist of the Aspidogastrea (Platyhelminthes: Trematoda) of the World, pp. 339-396 in Zootaxa 3918 (3) on page 355, DOI: 10.11646/zootaxa.3918.3.2, http://zenodo.org/record/24120
Uvitellina himantopi Dronen & Tkach 2013
No full textU. himantopi Dronen & Tkach, 2013 Type host. Black-winged or common stilt, Himantopus himantopus (Linnaeus) (Charadriiformes: Recurvirostridae). Type locality. Kherson Region, Ukraine. Remarks. Rudimentary oral sucker present—Dronen & Tkach (2013).Published as part of Dronen, Norman O. & Blend, Charles K., 2015, Updated keys to the genera in the subfamilies of Cyclocoelidae Stossich, 1902, including a reconsideration of species assignments, species keys and the proposal of a new genus in Szidatitreminae Dronen, 2007, pp. 1-100 in Zootaxa 4053 (1) on page 44, DOI: 10.11646/zootaxa.4053.1.1, http://zenodo.org/record/23711
Morishitium urocissae Dronen & Tkach 2014
No full textM. urocissae Dronen & Tkach, 2014 Type host. Red-billed blue magpie, Urocissa erythrorhyncha (Boddaert) (Passeriformes: Corvidae). Type locality. Dashahe Nature Reserve, Guizhou Province, People’s Republic of China. Remarks. Rudimentary oral sucker present—Dronen & Tkach (2014).Published as part of Dronen, Norman O. & Blend, Charles K., 2015, Updated keys to the genera in the subfamilies of Cyclocoelidae Stossich, 1902, including a reconsideration of species assignments, species keys and the proposal of a new genus in Szidatitreminae Dronen, 2007, pp. 1-100 in Zootaxa 4053 (1) on pages 75-76, DOI: 10.11646/zootaxa.4053.1.1, http://zenodo.org/record/23711
Climate Arctic Governance: Perspectives on sub-national data-driven policymaking
No full textPresentation of the member of the University of Lapland team working in the WP7 - Pavel Tkach at Climate Arctic Governance conference in Copenhagen that took place on September 16, 2022, about aspects of Arctic regional climate governance information and knowledge about which the author took from his work in the Arctic PASSION project and subsequent communication with the policymakers
Paracryptotropa Tkach, Chermak & Patitucci 2023, gen. nov.
No full text<i>Paracryptotropa</i> Tkach, Chermak & Patitucci gen. nov. <p> <i>Diagnosis:</i> Very small digeneans. Body broad, flaưened, with rounded anterior and posterior ends. Tegument armed with minute spines densely covering entire body. Oral sucker subterminal; ventral sucker in middle third of body. Prepharynx very short; pharynx rounded; oesophagus short. Caecal bifurcation immediately anterior to ventral sucker; caeca short, terminating approximately at level of middle of ovary. Testes in posterior half of body, very large, distinctly lobed, opposite, longitudinally elongated, post-ovarian. Copulatory pouch dorsal to ventral sucker; proximal and distal ends of copulatory pouch extend beyond ventral sucker; anterior end of copulatory pouch comma-shaped, curved towards dorsal surface of body. Genital pore submedian, sinistral, immediately extracaecal, at level of caecal bifurcation. Ovary entire, immediately posterodextral to ventral sucker, pretesticular. Vitellarium extensive, in the form of numerous irregularly shaped follicles forming fields of follicles from the level of pharynx to posterior end of body. There are almost no follicles in testicular area, although there are narrow fields of follicles immediately posterior to testes. Some vitelline follicles are positioned in middle third of body between testes. Uterus filling the space between ventral sucker and testes, extending posteriorly between testes to level of mid-length of testes. Metraterm weakly defined. Uterus with numerous eggs. Excretory pore terminal, excretory vesicle Y-shaped.</p> <p> <i>ZooBank registration:</i> urn:lsid:zoobank.org:act: 23E89889- AF9A-452F-9F3D-A29E5FA50755.</p>Published as part of <i>Tkach, Vasyl V., Chermak, Taylor P., Patitucci, Kaylyn K., Greiman, Stephen E., Binh, Tran Thi & Olson, Peter D., 2023, Jumping continents and major host lineages: phylogeny and diversity of the enigmatic Cryptotropidae (Platyhelminthes: Digenea), pp. 533-552 in Zoological Journal of the Linnean Society 199 (2)</i> on pages 547-549, DOI: 10.1093/zoolinnean/zlad037, <a href="http://zenodo.org/record/8426187">http://zenodo.org/record/8426187</a>
Neoastiotrema trituri Tkach 2008
No full textNeoastiotrema trituri (Grabda, 1959) Tkach, 2008 (Fig. 17) (Syn. Astiotrema trituri Grabda, 1959) Records. 1. Grabda (1959a, 1959b); 2. Sharpilo & Iskova (1989); 3. Tkach (2008). Remarks. Grabda (1959a) described A. trituri from the small intestine of the smooth, northern smooth or common newt, Lissotriton vulgaris (Linnaeus) (syn. Triturus vulgaris Dunn) (Caudata: Salamandridae), from Lake Mamry in northeastern Poland. Astiotrema trituri was distinguished from all Astiotrema species by (i) the position of the posterior testis near the posterior extremity of the body and posterior to the ends of the ceca, (ii) the much smaller cirrus pouch, and (iii) very large eggs – “almost double-sized” (48–61; 54 × 25–31; 29). That same year, Grabda (1959b) elucidated that A. trituri has life-cycle patterns identical to that of members of the Plagiorchioidea and concluded that the first intermediate host was a pulmonate snail, the great ramshorn, Planorbarius corneus (Linnaeus) (syn. Coretus corneus [Linnaeus]) (Gastropoda: Planorbidae). The second intermediate hosts included some cladoceran species: Simocephalus exspinosus (De Geer), Ceriodaphnia reticulata (Jurine), Daphnia magna Straus (Anomopoda: Daphniidae) and Eurycercus lamellatus (Müller) (Anomopoda: Eurycercidae). The development of this parasite includes the formation of a sporocyst and a xiphidiocercaria. Molecular characterization by Tkach (2008) of some taxa of Astiotrema including A. reniferum , A. monticellii (= P. monticellii), A. turneri (= H. turneri) and A. trituri demonstrated that the first three taxa formed a monophyletic clade closest to the heterophyids in contrast to A. trituri which clustered very close to Plagiorchis Lühe, 1899. Concerning A. trituri , it possesses a typical plagiorchiid-like bipartite seminal vesicle, whereas the other three species of Astiotrema (sensu lato) in the analysis of Tkach (2008) possess an undivided, sac-like seminal vesicle. Based on life-cycle patterns of A. monticellii (= P. monticellii) examined by Shevchenko & Vergun (1960), Tkach (2008) referred that: (i) the first intermediate host of A. monticellii (= P. monticellii) is the prosobranch (gilled) snail Bithynia leachii (Sheppard) (Gastropoda: Bithyniidae), not a pulmonate one as described for A. trituri; (ii) amphibians serve as the definitive host for A. trituri (see Grabda 1959b) whereas amphibians represent intermediate hosts for A. monticellii (= P. monticellii) (Shevchenko & Vergun 1960); and (iii) the development of A. monticellii (= P. monticellii) includes the formation of cercariae from the Pleurolophocerca group within rediae (see Shevchenko & Vergun 1960), which is typical for members of the Opisthorchioidea. As previous molecular phylogenetic analyses generally indicated that Astiotrema formed a monophyletic clade distinctly separate from all members of the Plagiorchioidea and that clade was, moreover, closer to the Opisthorchioidea (Tkach et al. 2001; Olson et al. 2003), Tkach (2008) removed A. trituri from Astiotrema and transferred it into the Plagiorchiidae. Despite the high similarity between A. trituri and members of Plagiorchis, the position of the right posterior testis (near the posterior extremity and past the cecal ends) vs the left anterior testis (intercecal and separated from right posterior testis by numerous uterine coils) gave justification for separating A. trituri into its own genus, Neoastiotrema, with its type- and only species, N. trituri (see Tkach 2008). Besprozvannykh et al. (2015) demonstrated that Shevchenko & Vergun (1960) most likely described a larva belonging to a member of the Opisthorchioidea and neither the cercaria nor the metacercaria of a species of Astiotrema. In addition, they clarified that the first intermediate host of A. odhneri is a pulmonate snail and not a prosobranch (gilled) one; whereas, the second intermediate host can include pulmonate snails, frog tadpoles, and small fish within which sporocysts and xiphidiocercariae develop, but neither rediae nor pleurolophocercariae form. Besprozvannykh et al. (2015, fig. 2) also demonstrated through 28S rRNA gene sequence data that Astiotrema species clustered away from the Plagiorchioidea and formed a monophyletic clade closer and in a basal position to the Opisthorchioidea. Thus, observations of life-cycle patterns by Besprozvannykh et al. (2015) point out a convergence between both Neoastiotrema and Astiotrema, whereas their phylogenetic results indicate a distant relationship between them. Accordingly, we conclude that: (1) reliance on life cycle patterns for differentiating between these two genera may not be useful; (2) without distinct morphological evidence, morphological data become more confusing and unconvincing for differentiating among morphologically similar taxa; hence, using molecular phylogenetic results and support may illustrate the degree of divergence or convergence and give an indicator for delimitations of species and/or higher ranks; (3) the bipartite vs unipartite nature of the seminal vesicle herein represents a stronger feature for differentiating between these two genera and it can be highly effective in differentiating at higher levels of taxonomy such as families or even superfamilies as stated by Pojmańska et al. (2008) and Tkach (2008).Published as part of Karar, Yasser F. M., Blend, Charles K., Dronen, Norman O. & Adel, Asmaa, 2023, Towards resolving the problematic status of the digenean genus Astiotrema Looss 1900: Taxa excluded from Astiotrema (sensu stricto) with special reference to plagiorchioid genera closely related to the restricted concept of Astiotrema, pp. 445-495 in Zootaxa 5284 (3) on pages 463-464, DOI: 10.11646/zootaxa.5284.3.2, http://zenodo.org/record/792950
Armadoatrium Tkach, Chermak & Olson 2023, gen.nov.
No full text<p> <i>Armadoatrium</i> Tkach, Chermak & Olson <b>gen.nov.</b></p> <p> <i>Diagnosis:</i> Body linguiform, slender. Tegument almost entirely covered with small spines, which diminish somewhat in size towards the posterior end of the body. Oral sucker well developed, subterminal. Prepharynx absent. Pharynx well developed. Oesophagus long. Intestinal bifurcation in posterior forebody. Caeca extend posteriorly well past ventral sucker, but do not reach testes. Genital atrium dorso-sinistral, extracaecal, in ventral sucker region. Genital atrium aperture surrounded by digitiform spines.</p> <p>Two testes, nearly opposite, slightly diagonal, in posterior third of body. Copulatory pouch large, comma-shaped, containing winding seminal vesicle, ejaculatory canal and prostatic glands. Everted cirrus not observed. Proximal end of copulatory pouch extends posteriorly far beyond ventral sucker. Fibrous male accessory pouch (stylet pouch), containing protractible stylet-like rod, situated postero-sinistrally to ventral sucker, its proximal end immediately posterior to ventral sucker.</p> <p>Ovary subspherical, situated dextrally to proximal end of copulatory pouch, between copulatory pouch and seminal receptacle. Seminal receptacle voluminous, immediately posterior to ovary. Vitellarium consisting of numerous small follicles of unequal size and shape, distributed peripherally around central region of body occupied by gonads, uterus and terminal genitalia. Vitelline follicles reach posterior end of body and mid-distance between suckers anteriorly. Mehlis’ gland situated between less testes and proximal end of copulatory pouch. Laurer’s canal not observed. Uterus ventral to gonads, extending posteriorly between testes, occupying space between gonads and expanding posteriorly between testes and laterally beyond testes. Metraterm with weak musculature. Uterine loops not very numerous, mainly in hindbody, passing between testes and almost reaching posterior end of body. Uterus containing numerous operculate eggs. Excretory pore terminal. Excretory vesicle not fully observed, its stem reaching at least mid-level of testes; remainder of excretory vesicle is obscured by uterus.</p> <p>In intestine of bats, Philippines.</p> <p> <i>Type species:</i> <i>Armadoatrium bushae</i> (Chermak & Tkach 2022) comb. nov.</p> <p> <i>ZooBank registration:</i> urn:lsid:zoobank.org:act: D716D46B-5801-45E0-B52B-48173299FA2B.</p>Published as part of <i>Tkach, Vasyl V., Chermak, Taylor P., Patitucci, Kaylyn K., Greiman, Stephen E., Binh, Tran Thi & Olson, Peter D., 2023, Jumping continents and major host lineages: phylogeny and diversity of the enigmatic Cryptotropidae (Platyhelminthes: Digenea), pp. 533-552 in Zoological Journal of the Linnean Society 199 (2)</i> on page 538, DOI: 10.1093/zoolinnean/zlad037, <a href="http://zenodo.org/record/8426187">http://zenodo.org/record/8426187</a>
Mykhailo Tkach`s love songs
No full textСтаття присвячена аналізові текстів пісень М. Ткача на тему кохання. Детально розглядаються їхні мотиви, символічно-образна система та художні особливості. На цій основі простежується тісний зв’язок між індивідуальним авторським началом, поетикою народної пісні та традиціями української класичної поезії.Статья посвящена анализу текстов песен М. Ткача на тему любви. Подробно рассматриваются их мотивы, символично-образная система и художественные особенности. На этой основе прослеживается тесная связь между индивидуальным авторским началом, поэтикой народной песни и традициями украинской классической поэзии.This article analyzes Mykhailo Tkach`s love songs. Their motives, symbolic-imaginative system and artistic features are considered here. It was observed that there is a close connection between the author`s style, the poetics of folk song and the traditions of Ukrainian classical poetry
HUMAN RESOURCE AS THE BASIS OF ECONOMIC SECURITY OF THE STATE
No full textThe work analyses the demographic and migration situation in Ukraine, predicted the possible consequences for the state as a result of such losses of the human resource as it is today, the dependence of the birth rate on the economic development of the country is shown. It is pointed out the lack of strategic planning in the state, which was supposed to ensure sustainable social and economic development of the state for decades. Migration programs for repatriation, simplification of procedures for obtaining citizenship and obtaining labor visas in such countries as Poland, Hungary, Turkey, Russia are considered. The main directions for combating the demographic crisis and population aging in Japan are given. On the example of China, it is shown that the main constituent of public success, both internal and external, is its population. Conclusions and recommendations are made aimed at preserving and restoring the human resource by the state
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