Abstract:A new amphimictic species Oscheius indicus n. sp. is described and illustrated with morphological and molecular data. The species is characterized by a medium-sized and slender body (female: L = 1.1 to 1.5 mm; a = 16.8 to 20.6; b = 5.7 to 7.1; c = 7.5 to 10.4; c' = 5.0 to 7.6; V = 45 to 51%), presence of four incisures each in the lateral fields with three minute warts, long rectum (2 to 3 anal body diameters), nine pairs of papillae arranged as 1+1+1/3+3 pattern, a prominent double-flapped epipytigma on vulva… Show more
“…Compared with O. chongmingensis (described as Oscheius rugaoensis by Zhang et al , 2012; Darsouei et al , 2014), they differ in the lateral field (5 vs. 1 wart) and tail length (45–100 vs. 113–155 μm). Compared with Oscheius indicus Kumar et al ., 2019, they differ in tail length (131–156 μm) and lateral field (5 vs. 3 warts). Compared with Oscheius shamimi Tahseen and Nisa, 2006; they differ in lateral field (5 vs. 2 warts), stoma length (13–18 vs. 19–23 μm) and tail length (45–100 vs. 110–132 μm).…”
Section: Resultsmentioning
confidence: 97%
“…The collected isolate of Rhabditid belonged to the Oscheius genus. There are many species in the genus of Oscheius that are morphologically very close together (Abolafia & Peña-Santiago, 2019; Kumar et al , 2019; Rana et al , 2021). Oscheius cyrus n. sp.…”
Section: Discussionmentioning
confidence: 99%
“…Due to this, Oscheius has received increased attention lately. However, heretofore the number of valid species of Oscheius has been expressed as 45 species (Zhou et al , 2017; Serepa-Dlamini & Gray, 2018; Kumar et al , 2019), but recently the verifiable species of this genus have been reported as 39. The revised list includes two subgenera, Oscheius Andrássy, 1976, (including 16 species), and Dolichorhabditis Andrássy, 1983, (containing 23 species) (Abolafia & Peña-Santiago, 2019; Castro-Ortega et al , 2020).…”
A new species of the genus Oscheius, Oscheius cyrus n. sp., collected in the moist soils taken from forest heights in the north of Iran, is recorded. A comprehensive description, comprising molecular (internal transcribed spacer (ITS), 18S, and 28S rDNA genes) information, morphometrics data, light microscope and scanning electron microscope images, is supplied. The species resembles Oscheius myriophilus. However, the highest ranges for female body length, female tail, infective juvenile tail length, median bulb, absence of epiptygma and lateral field incisures number vary. The new species was distinguished from Oscheius insectivorus by the general lip region. The male was not found. Molecular analysis showed that the new species has the most similarity to O. myriophilus both in the ITS and 18S regions. Morphological and molecular data confirmed its belonging to the Insectivora-group. Furthermore, the species of Ochrobactrum pseudogrignonense was reported as a dominant associated bacterium of the new Oscheius species. Finally, the mortality of the host after seven days varied from 20% to 82.5%, depending on nematodes’ concentration.
“…Compared with O. chongmingensis (described as Oscheius rugaoensis by Zhang et al , 2012; Darsouei et al , 2014), they differ in the lateral field (5 vs. 1 wart) and tail length (45–100 vs. 113–155 μm). Compared with Oscheius indicus Kumar et al ., 2019, they differ in tail length (131–156 μm) and lateral field (5 vs. 3 warts). Compared with Oscheius shamimi Tahseen and Nisa, 2006; they differ in lateral field (5 vs. 2 warts), stoma length (13–18 vs. 19–23 μm) and tail length (45–100 vs. 110–132 μm).…”
Section: Resultsmentioning
confidence: 97%
“…The collected isolate of Rhabditid belonged to the Oscheius genus. There are many species in the genus of Oscheius that are morphologically very close together (Abolafia & Peña-Santiago, 2019; Kumar et al , 2019; Rana et al , 2021). Oscheius cyrus n. sp.…”
Section: Discussionmentioning
confidence: 99%
“…Due to this, Oscheius has received increased attention lately. However, heretofore the number of valid species of Oscheius has been expressed as 45 species (Zhou et al , 2017; Serepa-Dlamini & Gray, 2018; Kumar et al , 2019), but recently the verifiable species of this genus have been reported as 39. The revised list includes two subgenera, Oscheius Andrássy, 1976, (including 16 species), and Dolichorhabditis Andrássy, 1983, (containing 23 species) (Abolafia & Peña-Santiago, 2019; Castro-Ortega et al , 2020).…”
A new species of the genus Oscheius, Oscheius cyrus n. sp., collected in the moist soils taken from forest heights in the north of Iran, is recorded. A comprehensive description, comprising molecular (internal transcribed spacer (ITS), 18S, and 28S rDNA genes) information, morphometrics data, light microscope and scanning electron microscope images, is supplied. The species resembles Oscheius myriophilus. However, the highest ranges for female body length, female tail, infective juvenile tail length, median bulb, absence of epiptygma and lateral field incisures number vary. The new species was distinguished from Oscheius insectivorus by the general lip region. The male was not found. Molecular analysis showed that the new species has the most similarity to O. myriophilus both in the ITS and 18S regions. Morphological and molecular data confirmed its belonging to the Insectivora-group. Furthermore, the species of Ochrobactrum pseudogrignonense was reported as a dominant associated bacterium of the new Oscheius species. Finally, the mortality of the host after seven days varied from 20% to 82.5%, depending on nematodes’ concentration.
“…Otherwise with the features of the family.302 Divided into the Dolichura group and the Insectivora group(Sudhaus 2011). Species in the Dolichura group generally have a slender body, peloderan bursa, inconspicuous posterior phasmids and spicules with straight tip (no distal hook), while species in the Insectivora group generally have a wide body with 4 to 6 incisures in the lateral fields, pseudopeloderan/leptoderan bursa, more conspicuous phasmids posterior to the last genital papillae and needle-like spicules with distal hooks(Kumar et al 2019). Species identification of the genus is very challenging since morphological characters are very similar.…”
A classification of the entire Phylum Nematoda is presented, based on current molecular, developmental and morphological evidence. The classification reflects the evolutionary relationships within the phylum, as well as significant areas of uncertainty, particularly related to the early evolution of nematodes. It includes 3 classes, 8 subclasses, 12 superorders, 32 orders, 53 suborders, 101 superfamilies, 276 families, 511 subfamilies, 3030 genera, and 28537 species. All valid species named from the time of publication of the previous classification and census (2010) to the end of 2019 are listed, along with the number of valid species in each genus. Taxonomic authorities are provided for taxon names of all ranks. The habitats where the species in each genus are found are listed, and an alphabetic index of genus names is provided. The systematics of nematodes is reviewed, along with a history of nematode classification; evolutionary affinities and origins of nematodes; and the current diagnosis of the group. Short overviews of the general biology, ecology, scientific and economic importance of the group are presented.
“…6) and 28S (fig. 7) rDNA fragments show O. citri as a sister group to the clade formed by O. chongmingensis, O. rugaoensis (Zhang et al, 2012) Darsouei, Karimi & Shokoohi, 2014 and O. indicus Kumar, Jamal, Somvanshi, Chauban & Mumtaz, 2019. Fig.…”
A population of a nematode species belonging to the genus Oscheius was isolated in western Uttar Pradesh, India. Morphological and morphometrical studies on this species showed its high similarity with six species described previously from Pakistan (Oscheius citri, O. cobbi, O. cynodonti, O. esculentus, O. punctatus and O. sacchari). The molecular analysis of the ITS1-5.8S-ITS2 rDNA sequences of the Indian population and the six species described from Pakistan showed that all the sequences are almost identical. Thus, based on morphological and molecular characteristics, all of the six above-mentioned Pakistani species and Indian strain do not differ from each other, hence can be considered synonyms. The correct name for this taxon is the first described species O. citri. Additionally, the phylogenetic analysis of the 18S rDNA and the 28S rDNA sequences showed that Oscheius citri is sister to the clade formed by O. chongmingensis and O. rugaoensis from China. The high similarity of morphological and morphometric characteristics of O. citri and other species, O. maqbooli, O. nadarajani, O. niazii, O. shamimi and O. siddiqii, suggest their conspecificity; however, lack of molecular data for these species does not allow this hypothesis to be tested.
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