1,357,768 research outputs found
Chordodes ferganensis Kirjanova & Spiridonov 1989
No full text[Chordodes ferganensis Kirjanova & Spiridonov 1989] (Figure 3 C, 3 D) 1989. Chordodes ferganensis Kirjanova & Spiridonov Parasitologiya 23: 358. Holotype: 1 female (ZIS 100). Type locality: Uzbekistan, near Fergana city Material examined: Holotype SEM midbody Host: undetermined mantid (Kirjanova & Spiridonov 1989). Description: Cuticle covered by five types of areole (Figs. 3 C, 3 D). Simple areoles with smooth surface or bearing short bristles, some oval or rounded areoles carrying apical fingerlike tubercle (tubercle areoles) and clusters of crowned and circumcluster areoles with short apical filaments (Fig. 3 C). Restricted to the ventral and dorsal midline there are another type of crowned areoles with long filaments that occur in clusters of two and surrounded by circumcluster areoles (Fig. 3 D). Dimensions: Length 266 mm, maximal diameter 2 mm (Kirjanova & Spiridonov 1989). Comments: Kirjanova & Spiridonov (1989) described Chordodes ferganensis with 4 areolar types and also indicate the presence of crowned areoles with long filaments in midventral and middorsal longitudinal lines without designating them as another areolar type. Our reinvestigation by SEM (Fig. 3 C) shows that the features of the cuticle of Chordodes ferganensis are coincident with the ones described for the lectotype of C. anthophorus. Kirjanova & Spiridonov (1989) specify these similarities and consider that C. ferganensis is quite close to C. anthophorus and C. aquaeductus but differs by the presence of the crowned areoles with very long projections. This type of crowned areoles, along the ventral and dorsal midline, has also been observed by the authors in the lectotype of C. anthophorus. Therefore, we regard C. ferganensis as a synonym of C. anthophorus.Published as part of Villalobos, Cristina De, Zanca, Fernanda & Spiridonov, Sergei, 2007, Fine morphology of the cuticle surface of Chordodes anthophorus and reinterpretation of C. aquaeductus, C. ferganensis and C. oscillatus (Gordiida Nematomorpha), pp. 39-45 in Zootaxa 1397 on pages 43-44, DOI: 10.5281/zenodo.27368
Parathranitiinae Spiridonov 2020
No full textSubfamily PARATHRANITIINAE Spiridonov, 2020 This is a new subfamily established by Spiridonov (2020) including only the genus Parathranites Miers. It was placed in the family Carcinidae based on morphological and molecular evidences gathered in recent studies, especially that by Evans (2018).Published as part of Muñoz, Isabel, García-Isarch, Eva & Cuesta, Jose A., 2021, Annotated and updated checklist of marine crabs (Decapoda: Brachyura) of Mozambique supported by morphological and molecular data from shelf and slope species of the " MOZAMBIQUE " surveys, pp. 1-67 in Zootaxa 5056 (1) on pages 39-40, DOI: 10.11646/zootaxa.5056.1.1, http://zenodo.org/record/557788
Thalamita rubridens Apel & Spiridonov 1998
No full text<i>Thalamita rubridens</i> Apel & Spiridonov, 1998 <p> <b>Persian Gulf.</b> Saudi Arabia (Apel & Spiridonov 1998), Bahrain (Apel & Spiridonov 1998), UAE (Apel & Spiridonov 1998), Iran (present study).</p> <p> <b>Iran.</b> <i>Hormozgan Province</i>: Qeshm I. (Salakh).</p> <p> <b>General distribution.</b> Endemic: Persian Gulf.</p> <p> <b>Habitat.</b> Rocky/cobble intertidal to 9 m.</p> <p> <b>Remarks.</b> Apel & Spiridonov (1998) described this species originally from the Persian Gulf, and discussed its morphological affinity with its sympatric congeners, <i>T</i>. <i>prymna</i> and <i>T</i>. <i>crenata</i> (for detailed remarks see Apel & Spiridonov 1998: 295–296). The present record is the second one of the species from the Gulf and the first record from the Iranian coast.</p>Published as part of <i>Naderloo, Reza & Türkay, Michael, 2012, Decapod crustaceans of the littoral and shallow sublittoral Iranian coast of the Persian Gulf: Faunistics, Biodiversity and Zoogeography 3374, pp. 1-67 in Zootaxa 3374 (1)</i> on page 42, DOI: 10.11646/zootaxa.3374.1.1, <a href="http://zenodo.org/record/5253502">http://zenodo.org/record/5253502</a>
Addenum to the description of Steinernema jollieti Spiridonov, Krasomil-Osterfeld & Moens, 2004
No full textAdditonal morphological data are provided for Steinernema jollieti Spiridonov, KrasomilOsterfeld, Moens, 2004. A light and scanning electron microscopy were used to particularize taxonomically important characters missing in the first decsription. The GS% and SW% indices are provided for males. The distribution of genital papillae on male tail is illustrated with SEM images. Structure of female tail and vulvar area are decsribed for females of the first and second generation. The relationships of S. jollieti with other steinernematid feltiae/kraussei group species are discussed
Severianoia annamensis Van Luc and Spiridonov 1993
No full textSeverianoia annamensis Van Luc and Spiridonov, 1993 (Table 3) Several specimens of P. surinamensis collected in southern Florida were infected with S. annamensis (Table 3). Taxonomic Summary Host: Pycnoscelus surinamensis (Linnaeus, 1758) Locality: John Pennecamp Coral Reef State Park, Key Largo, Florida (25 ̊7’38.3”N, 80 ̊24’31.2”W). Prevalence = 15%; mean intensity = 2.8 Site of infection: hindgut Specimens deposited: Vouchers HWML 99923 1 male, 1 female; HWML 99924, three females, John Pennecamp Coral Reef State Park, Key Largo, Florida. Voucher DNA sequence: 18S small subunit ribosomal RNA gene, partial sequence Genbank accession number KX752431. General observations of S. annamensis from Florida. Although esophageal proportions are slightly larger (with overlap) in the Florida specimens (415–503 µm in Florida specimens vs. 320–460 µm in original description), other measurements overlapped more broadly with those provided for S. annamensis, and the specimens were determined to be morphologically indistinguishable. The type species, Severianoia severianoi (Schwenck, 1926) Travassos, 1929 has much larger esophageal length (525–706 µm in original description by Schwenck and redescription by Kloss, 1966). Female body length (3000–4366 µm) is also greater in S. severianoi. A report of a single female originally identified by Chitwood (1932) as S. severianoi from P. surinamensis in southern Florida (Paradise Key, Everglades National Park) included measurements that are more consistent with S. annamensis (Van Luc & Spiridonov, 1993). The tail length of Chitwood’s female (110 µm) fell well out of the range of the Key Largo specimens (141–159 µm). However, tail length in the original description of S. severianoi (100–200 µm) overlaps with both species (Schwenck, 1926; Van Luc and Spiridonov, 1993), and re-measurement of Chitwood’s specimen (US National Parasite Collection code USNPC 31893) yielded a tail length of 147 µm. The Severianoia sp. documented from the Galápagos Islands also yielded overlapping measurements of both males and females of S. annamensis and more closely resembles S. annamensis than S. severianoi (Sinnott et al., 2015).Published as part of Carreno, Ramon A., 2017, New species of Hammerschmidtiella Chitwood, 1932, and Blattophila Cobb, 1920, and new geographical records for Severianoia annamensis Van Luc & Spiridonov, 1993 (Nematoda: Oxyurida: Thelastomatoidea) from Cockroaches (Insecta: Blattaria) in Ohio and Florida, U. S. A., pp. 429-441 in Zootaxa 4226 (3) on pages 438-439, DOI: 10.11646/zootaxa.4226.3.6, http://zenodo.org/record/26409
Desmarest, 1823 species of the region
No full textSpiridonov, Vassily A., Apel, Michael (2007): A new species and new records of deep-water Calappidae (Crustacea: Decapoda) from the Indian Ocean with a key to the Mursia Desmarest, 1823 species of the region. Journal of Natural History 41 (45-48): 2851-2890, DOI: 10.1080/00222930701770786, URL: http://dx.doi.org/10.1080/0022293070177078
Ovalipiinae Spiridonov, Neretina & Schepetov 2014
No full textSubfamily OVALIPIINAE Spiridonov, Neretina & Schepetov, 2014 The subfamily Ovalipiinae was described as family Ovalipidae by Spirodonov et al. (2014). However, Spirodonov (2020), in agreement with the suggestion by Evans (2018) based on his molecular phylogenetic reconstruction, accepted the closer relationships of Ovalipes with geryonids and consequently moved this group as a subfamily of the Geryonidae with only one genus. They are pelagic species known as swimming crabs (Kensley 1981).Published as part of Muñoz, Isabel, García-Isarch, Eva & Cuesta, Jose A., 2021, Annotated and updated checklist of marine crabs (Decapoda: Brachyura) of Mozambique supported by morphological and molecular data from shelf and slope species of the " MOZAMBIQUE " surveys, pp. 1-67 in Zootaxa 5056 (1) on page 41, DOI: 10.11646/zootaxa.5056.1.1, http://zenodo.org/record/557788
Figure 15 in A new species and new records of deep-water Calappidae (Crustacea: Decapoda) from the Indian Ocean with a key to the Mursia Desmarest, 1823 species of the region
No full textFigure 15. Distribution of Mursia species in the Indian Ocean.Published as part of Spiridonov, Vassily A. & Apel, Michael, 2007, A new species and new records of deep-water Calappidae (Crustacea: Decapoda) from the Indian Ocean with a key to the Mursia Desmarest, 1823 species of the region, pp. 2851-2890 in Journal of Natural History 41 (45-48) on page 2886, DOI: 10.1080/00222930701770786, http://zenodo.org/record/529815
Leidynema bestium Spiridonov & Kiselev 2022, sp. n.
No full textLeidynema bestium sp. n. (Figs. 1 – 3; Tables 1 – 2) Female. Cephalic capsule well defined, 22 – 23 µm long and 51–53 µm in diameter with anteriorly protruding circumoral disk of 25 µm in diameter (Fig. 1B; 2A). First five rings of cuticle narrow, 12 – 14 to 20 µm wide with diameter increasing from 50 – 52 µm up to 75 µm (Fig. 2A). Cuticular rings posterior to first five ones much wider (25 µm and more) and keeping this more or less uniform width throughout the body. Stomatal opening round, encircled with eight trapezoidal pseudolabia (Fig. 2A – C). Circumoral disk of eight pseudolabia separated from remaining surface of anterior end with a deep seam. Cuticle on both sides of this seam groove with wrinkled surface (Fig. 2B). Amphidial opening on separate plate 1 x 0.6 µm in size, wedged between pseudolabia (Fig. 2B – C). Buccal cavity thin-walled at anterior (cheilostom), containing strongly cuticularised tubular part at level of cephalic capsule (Fig. 1B). Additional cuticularised structures at bottom of buccal cavity embedded into pharyngeal tissue (stegostom). Lateral alae 13–18 µm wide, starting from bulb level and terminating before anus level without sharpened spikes (Fig. 2F). Three elongated structures 4 x 1.5 µm in size situated at anterior of pharyngeal lumen (Fig. 1B). Anterior half of pharyngeal corpus narrower (26 – 27 µm) than its basal part (57 – 58 µm). Nerve ring situated at border between narrow and wider parts of pharynx, 157 – 168 µm from anterior. Basal bulb and isthmus separated from corpus by thick basal membrane (Fig. 1C). Bulb containing valves and separate from valvular cuticularised structures: triangular plates posterior to valves and round structures closer to cardia. Excretory pore located in 310 – 580 µm from anterior. Cuticularised excretory duct leading from pore to excretory vesicle (Fig. 1D). Four wide thin-walled excretory channels running into lateral chords (X-shaped excretory system). Intestine composed of numerous hexagonal-polygonal cells. Proventriculus wide with thick walls. Voluminous caecum starting from proventriculus and ending 150 – 230 µm from anterior border of muscular vagina. Didelphic amphidelphic reproductive system. Two uteri run in opposite direction from proximal end of vagina. Anterior uterus then turns back into posterior body part, with majority of eggs situated posterior to vulva. Egg-shell length 115 μm (112–119 μm), width 45 μm (41–47 μm). Muscular vagina about 120 – 180 µm long directed anteriorly from vulvar opening. Vulva equatorial (V% = 49–51). Posterior body tightly filled with gonadal tubes. Anterior ovary tip cell situated usually at level of intestinal caecum and posterior ovary tip cell midway between vulva and anus. Anal diameter four times less as mid-body diameter. Tail filament comparatively short, dagger-like (Fig. 1A, 2D). Female juvenile of fourth stage. Cuticle on ventral and dorsal sides of the body covered with regularly distributed bulges (Fig. 2E) with approx. size (length x width) 5 – 10 x 4 – 9 µm. Male. Body slender, with ventrally bent posterior end (Fig. 1G, 3C). Circumoral plate 10 µm wide. Cephalic capsule swollen, 15 µm in diameter. Body narrowing just posterior to capsule (11 – 12 µm in diameter). Fifteen anterior cuticular rings prominent, with longitudinal ridges (striation) increasing in length from 2 – 3 µm to 7 – 8 µm (Fig. 3A). Lateral alae starting at level of fifteenth ring or mid-corpus level (body diameter at this level about 30 µm) and terminating near rectum. Buccal cavity tubular with transparent walls and single short mid-length thickening of cuticular lining (Fig. 1H). Three refractive thickenings on stoma-pharynx junction. Nerve ring at posterior of corpus. Isthmus transparent, swollen at border with corpus bulb (Fig. 1H). Bulb containing three distinct valves with very thin cuticular folds. Excretory pore visible in some specimens at bulb level. Intestine anterior with wide lumen. Testis reflexing at mid-body (Fig. 1G). Posterior half of gonadal tube with transparent walls. A portion of gonadal tube before cloaca with vacuolated walls (vas deferens). Single rod-like spicule with slightly curved tip and thickened head. Four pairs of copulatory papillae: a pair of protruding subventral ones before cloacal opening (Fig. 3C – F); two pairs of subventral postcloacal papillae of different size: a pair of larger-sized situated at midtail on cuticle protrusion, and a pair of smallest ones close to tail mucron (Fig. 3D – F) and a subdorsal pair of papillae intermediate in size. Precloacal and subdorsal papillae of typical thelastomatid structure with central round protrusion and nine smaller tubercles around (Fig. 3D – G). Well defined mid-ventral opening of unknown function behind the cloaca. Deep lateral surface pit at mid-tail distinguished under SEM only (maybe due to an artefact of drying). Tail mucron 3 – 5 µm long, rod-like (Fig. 3F). Type host. Diploptera punctata (Eschscholtz, 1922). Another host. Elliptorhina chopardi (Lefeuvre, 1966) Etymology. The specific name of the new species reflects its finding in cultured cockroaches from a zoo (bestiarium). Localization. Hind gut lumen (colon). Type specimens. Holotype male on the slide accession number 1333 (IPEE RAS parasites) and paratypes (five males on slides 14301 a–e and five females on slides 14300 a–e) are deposited in the Museum of the Helminthological Collections of the Centre of Parasitology, A.N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences. The voucher specimens, two females of L. bestium obtained from the dissections of Elliptorhina chopardi, are stored at the same collection (slides 14302 a–b). Bionomics. Intensity of the infection with Leidynema bestium of the Diploptera punctata: 1– 3 females and 1– 2 males per host. Molecular phylogenetic analysis. The LSU rDNA sequences of specimens obtained from both hosts were compared and found to be completely identical (Table 2). The final dataset of the obtained alignment for new and related species contained 650 positions. The LSU rDNA sequence of the new species has demonstrated the 42 bp difference with L.portentosae Van Waerebeke, 1978 and 68–70 bp difference with the type species L. appendiculatum. The nucleotide difference between L. appendiculatum and L. portentosae was 63 – 64 bp. Remarkably, the nucleotide sequences of L. appendiculatum were splitting onto two clades (Fig. 4), designated conditionally as clade A and clade B. The sequences of the clade A were obtained from Leidynema nematodes parasitizing in different cockroach genera (Blaberus Serville, 1831, Blatta Linnaeus, 1758, Periplaneta Burmeister, 1838, Shelfordella Adelung, 1910. The sequences of clade B were obtained from L. appendiculatum nematodes originating nearly exclusively from Periplaneta cockroaches with only sequence deposited under KY057029 originating from nematode parasitizing Pycnoscelus surinamensis (Linnaeus, 1758). The nucleotide difference between these two clades was in 10 bp. The distances between of L. bestium sp. n. and species of other thelastomatid genera associated with cockroaches were more remarkable accounting for 109 bp of Buzionema validum Kloss, 1966, 112 bp of Severianoia blapticola Guzeyeva, 2009, 121 bp of Cranifera cranifera (Chitwood, 1932), 138 bp of Aoruroides chubadaigaku Morffe, García, Hasegawa & Carreno, 2019 and 167 bp of Hammerschmidtiella keeneyi Carreno, 2017. Differential diagnosis. Morphology of L. bestium sp. n. demonstrates several features to distinguish it from the previously described species (Singh et al. 2014). The new species is characterised by the presence of lateral alae in both sexes with posterior margin of alae before the anal opening level, absence of a spike-like posterior termination of lateral alae in females, longitudinal striation of the anteriormost annuli in males; four pairs of male genital papillae, and the equatorial position of vulva. The lateral alae are present both in males and females of L. bestium sp. n. In this aspect the new species is similar to L. appendiculatum, L. delatorrei Chitwood, 1932; L. periplaneti Farooqui, 1967; L. orientalis Singh & Malti, 2004; L. saltense (Achinelly & Camino, 2008) and L. meerutensis Singh, Rastogi & Singh, 2014. Leidynema bestium sp. n. is closest to L. delatorrei in the presence of longitudinal striation of the first 15 annuli at the male anterior end (Leibersperger, 1960) and in the structure of a female tail filament (quite short, dagger-like), but differs in the total number of genital papillae in males (five in L. delatorrei vs four in L. bestium sp. n.). Lateral alae in L. delatorrei males end at cloaca level vs in 20 µm anterior to cloaca in L. bestium sp. n. The new species also differs from L. delatorrei in having the longer average male body (above 900 µm vs 680 µm in L. delatorrei). According to Singh et al. (2014), the vulva in L. delatorrei is displaced to anterior part of the body (V% = 41 – 43) while in the new species vulva is located in mid-body. The new species can be distinguished from the type species L. appendiculatum by the presence of longitudinal striations of annuli at the male anterior end, presence of four vs five genital papillae and the wider and shorter female tail filament.All remaining species of Leidynema, both sexes of which possess lateral alae can be distinguished from L. bestium sp. n. by the following unique features (Singh et al. 2014): five pairs of papillae in L. periplaneti and L. orientalis, anteriorly displaced excretory pore in L. saltense and asymmetrically disposed female ala posterior ends (spikes) in L. meerutensis. Thus, L. orientalis differs from the present species by the posterior position of vulva. L. saltense unlike L. bestium sp. n. n has more anterior position of the excretory pore. Leidynema meerutensis can be differentiated from L. bestium sp. n. in the presence of a terminal spike, i.e. pointed posterior end of female lateral alae vs not pointed.Published as part of Spiridonov, Sergei E. & Kiselev, Sergei M., 2022, Leidynema bestium sp. n. (Oxyuridomorpha: Thelastomatidae) an intestinal parasite of blaberid cockroaches from Yaroslavl Zoo, Russia, pp. 271-280 in Zootaxa 5200 (3) on pages 272-276, DOI: 10.11646/zootaxa.5200.3.5, http://zenodo.org/record/726053
A Critical Phenomenon in Solitonic Ising Chains
No full textWe discuss a phase transition of the second order taking place in non-local 1D Ising chains generated by specific infinite soliton solutions of the KdV and BKP equations.The work of I.M. Loutsenko has been supported by European Community grant MIFI-CT-2005-007323 and V.P. Spiridonov is partially supported by the Russian Foundation for Basic Research (grant no. 05-01-01086). The authors are grateful to V.B. Priezzhev for useful remarks
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