<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The new species <italic>Iotonchus lotilabiatus</italic> n. sp. from Bat Xat Nature reserve in Lao Cai Province, Vietnam is described and the molecular data (18S and 28S rDNA) are given. Females of the new species are characterized by large body size (<italic>L</italic> = 3.8-5.2 mm); barrel shaped buccal cavity of large size (41–54×70–89 µm) with dorsal tooth apex located 22 to 23.5% of buccal cavity length from its base; reproductive system didelphic-amphidelphic, vagina long, corresponding almost half of body width at the vulva with distinct <italic>parrefringens vaginae</italic>, sclerotized and triangulated pieces in optical section; tail long filiform, ventrally arcuate, with three small caudal glands in tandem and prominent terminal spinneret. Males with spicules 119 to 148 µm in length, and slender, slightly curved gubernaculum, 39 to 44 µm long and with 13 to 14 ventromedian supplements. The new species <italic>Iotonchus lotilabiatus</italic> n. sp. is closest to <italic>I. miamaensis</italic> (Khan and Araki, 2002), but differs by having larger size of body length and buccal cavity, lower position of dorsal tooth apex; longer female tail with lower <italic>c</italic> but higher <italic>c′</italic> ratios and the presence of advulval cuticular structures.</p>
</abstract>

The new species Iotonchus lotilabiatus n. sp. from Bat Xat Nature reserve in Lao Cai Province, Vietnam is described and the molecular data (18S and 28S rDNA) are given. Females of the new species are characterized by large body size (L = 3.8-5.2 mm); barrel shaped buccal cavity of large size (41–54×70–89 µm) with dorsal tooth apex located 22 to 23.5% of buccal cavity length from its base; reproductive system didelphic-amphidelphic, vagina long, corresponding almost half of body width at the vulva with distinct parrefringens vaginae, sclerotized and triangulated pieces in optical section; tail long filiform, ventrally arcuate, with three small caudal glands in tandem and prominent terminal spinneret. Males with spicules 119 to 148 µm in length, and slender, slightly curved gubernaculum, 39 to 44 µm long and with 13 to 14 ventromedian supplements. The new species Iotonchus lotilabiatus n. sp. is closest to I. miamaensis (Khan and Araki, 2002), but differs by having larger size of body length and buccal cavity, lower position of dorsal tooth apex; longer female tail with lower c but higher c′ ratios and the presence of advulval cuticular structures.

<article-title xml:lang="en">Morphological and molecular characterization of <italic>Iotonchus lotilabiatus</italic> n. sp. (Nematoda: Iotonchidae) from Lao Cai Province, Vietnam

Journal of Nematology

This work is licensed under the Creative Commons Attribution 4.0 International License.

Morphological and molecular characterization of  n. sp. (Nematoda: Iotonchidae) from Lao Cai Province, Vietnam

The new species Iotonchus lotilabiatus n. sp. from Bat Xat Nature reserve in Lao Cai Province, Vietnam is described and the molecular data (18S and 28S rDNA)...

Morphological and molecular characterization of Iotonchus lotilabiatus n. sp. (Nematoda: Iotonchidae) from Lao Cai Province, Vietnam

Published Online: Jul 27, 2021

Page range: 1 - 22

DOI: https://doi.org/10.21307/jofnem-2021-066

Keywords
Morphology, Ribosomal DNA, Taxonomy

© 2021 Tam T. T. Vu et al., published by Sciendo.

This work is licensed under the Creative Commons Attribution 4.0 International License.

Morphological and molecular characterization of Iotonchus lotilabiatus n. sp. (Nematoda: Iotonchidae) from Lao Cai Province, Vietnam

Published Online: Jul 27, 2021

Page range: 1 - 22

DOI: https://doi.org/10.21307/jofnem-2021-066

KeywordsMorphology, Ribosomal DNA, Taxonomy

© 2021 Tam T. T. Vu et al., published by Sciendo.

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
Morphology, Ribosomal DNA, Taxonomy