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Morphological and molecular characterization of two species of Neothada Khan, 1973 (Nematoda: Tylenchidae) from Iran, with notes on N. cancellata.

ABSTRACT: Three species of the genus Neothada, including N. cancellata, N. hades and N. major, collected from the rhizosphere of mosses in Khuzestan, southwestern Iran, are redescribed and illustrated. Neothada hades and N. major are new records from Iran. Neothada hades has 14 longitudinal incisures excluding the lateral field, body length of 586 (505-674) µm, stylet 10.5 (10.0-10.8) µm in length bearing distinct basal knobs, and an elongated-conical tail 70.4 (65-74) µm long with a finely to bluntly rounded terminus. N. major possesses 18-20 longitudinal incisures excluding the lateral field, body length of 657 (600-728) µm, stylet 10.9 (10.3-11.7) µm long with basal swellings but not distinct knobs, and an elongated-conical tail 78.2 (70-83) µm long ending to a finely to bluntly rounded terminus. Molecular phylogenetic studies of the two species (N. hades and N. major) with 664 bp of D2-D3 expansion segments of 28 S rDNA revealed that they form a clade with N. cancellata.

SUBMITTER: Hosseinvand M

PROVIDER: S-EPMC8015382 | biostudies-literature |

REPOSITORIES: biostudies-literature

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Project description:A new species of the genus Paurodontella, P. composticola n. sp., collected from Nazar Abad City, Alborz Province, Iran, is described and illustrated. The new species has a body length of 803-1053???m (females n?=?10) and 620 and 739???m (males n?=?2). The cuticle is weakly annulated with four lateral lines. Cephalic region is annulated and continuous with body contour. The stylet is 8.0 to 9.0???m long with asymmetrical knobs. Esophageal basal bulb is present with a small posterior extension projecting into the intestine. Excretory pore is situated at the level of esophageal basal bulb region. Post-uterine sac is 5 to 8???m long and uterus is without diverticulum. Tails of both sexes are similar, short and sub-cylindrical. Males have 24 to 25???m long bursa leptoderan and spicules 24 or 25?µm long. A non-branching oviduct is present to form a uterine diverticulum; the new species is closely related to five known species of the genus, namely P. asymmetrica, P. balochistanica, P. densa, P. iranica and P. niger. It most closely resembles P. iranica, but differs from it morphologically by a shorter stem-like extension projecting into lumen of intestine and male with sub-cylindrical tail vs conoid. In addition to morphological comparisons, the molecular phylogenetic analyses based on 733?bp of the partial sequence of 28S D2/D3 expansion segments of the large subunit rDNA gene (LSU) revealed this as a new species.A new species of the genus Paurodontella, P. composticola n. sp., collected from Nazar Abad City, Alborz Province, Iran, is described and illustrated. The new species has a body length of 803–1053???m (females n?=?10) and 620 and 739???m (males n?=?2). The cuticle is weakly annulated with four lateral lines. Cephalic region is annulated and continuous with body contour. The stylet is 8.0 to 9.0???m long with asymmetrical knobs. Esophageal basal bulb is present with a small posterior extension projecting into the intestine. Excretory pore is situated at the level of esophageal basal bulb region. Post-uterine sac is 5 to 8???m long and uterus is without diverticulum. Tails of both sexes are similar, short and sub-cylindrical. Males have 24 to 25???m long bursa leptoderan and spicules 24 or 25?µm long. A non-branching oviduct is present to form a uterine diverticulum; the new species is closely related to five known species of the genus, namely P. asymmetrica, P. balochistanica, P. densa, P. iranica and P. niger. It most closely resembles P. iranica, but differs from it morphologically by a shorter stem-like extension projecting into lumen of intestine and male with sub-cylindrical tail vs conoid. In addition to morphological comparisons, the molecular phylogenetic analyses based on 733?bp of the partial sequence of 28S D2/D3 expansion segments of the large subunit rDNA gene (LSU) revealed this as a new species.

Dataset Information

Morphological and molecular characterization of two species of Neothada Khan, 1973 (Nematoda: Tylenchidae) from Iran, with notes on N. cancellata.

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