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Morphological, Morphometrical and Molecular Characterization of Oscheius siddiqii Tabassum and Shahina, 2010 (Rhabditida, Rhabditidae) from India with Its Taxonomic Consequences for the Subgenus Oscheius Andrassy, 1976.

ABSTRACT: An insect parasitic nematode belonging to the genus Oscheius was recovered from the agricultural soils from the Hapur district in western Uttar Pradesh, India. Morphological studies on this species exhibited its high resemblance with two Pakistani species: Oscheius siddiqii and O. niazii. No molecular data are available for these taxa but, morphologically, both species do not differ significantly from our strains and each other. Hence, these nematodes can be considered conspecific, and the correct name for this taxon is O. siddiqii, the first described species. The phylogenetic analyses of the ITS-, 18S-, and the 28S rDNA sequences showed that O. siddiqii is a sister taxon to the group formed by Oscheius microvilli, O. myriophilus, O. safricanus, and several unidentified Oscheius species. Additionally, our analyses show that based on molecular and morphological data, the species Oscheius rugaoensis and O. microvilli cannot be distinguished from O. chongmingensis and O. myriophilus, respectively, and are thus considered junior synonyms of these taxa. Furthermore, the available data are not sufficient to evaluate the status of Oscheius basothovii and O. safricanus, which are, in consequence, considered species inquirendae. These findings highlight the necessity of the proper morphological and molecular characterisation of the described Oscheius species.

SUBMITTER: Bhat AH

PROVIDER: S-EPMC8698764 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description: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 vulval opening, presence of open leptoderan bursa and crochet needle-shaped spicules place it in the insectivora group. Morphologically, O. indicus n. sp. closely resembles O. carolinensis, O. chongmingensis, O. colombiana, and O. nadarajani. Molecular phylogenetic analysis carried out using ITS and D2/D3 expansion region of 28S rDNA sequences suggests that O. indicus n. sp. is closer to O. chongmingensis and O. rugaonensis. In summary, the morphometrical data, morphological observations and molecular phylogenetic analysis suggested that O. indicus n. sp. is sufficiently different from any known species and is therefore proposed as a new species within the insectivora group.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 vulval opening, presence of open leptoderan bursa and crochet needle-shaped spicules place it in the insectivora group. Morphologically, O. indicus n. sp. closely resembles O. carolinensis, O. chongmingensis, O. colombiana, and O. nadarajani. Molecular phylogenetic analysis carried out using ITS and D2/D3 expansion region of 28S rDNA sequences suggests that O. indicus n. sp. is closer to O. chongmingensis and O. rugaonensis. In summary, the morphometrical data, morphological observations and molecular phylogenetic analysis suggested that O. indicus n. sp. is sufficiently different from any known species and is therefore proposed as a new species within the insectivora group.

Dataset Information

Morphological, Morphometrical and Molecular Characterization of Oscheius siddiqii Tabassum and Shahina, 2010 (Rhabditida, Rhabditidae) from India with Its Taxonomic Consequences for the Subgenus Oscheius Andrassy, 1976.

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