Abstract
Seinura italiensis n. sp. isolated from the medium soil imported from Italy is described and illustrated using morphological and molecular data. The new species is characterized by having short body (477 (407-565) μm and 522 (469-590) μm for males and females, respectively), three lateral lines, stylet lacking swellings at the base, and excretory pore at the base or slightly anterior to base of metacorpus; females have 58.8 (51.1-69.3) μm long post-uterine sac (PUS), elongate conical tail with its anterior half conoid, dorsally convex, and ventrally slightly concave and the posterior half elongated, narrower, with finely rounded to pointed tip and males having seven caudal papillae and 14.1 (12.6-15.0) μm long spicules. Morphologically, the new species is similar to S. caverna, S. chertkovi, S. christiei, S. hyrcania, S. longicaudata, S. persica, S. steineri, and S. tenuicaudata. The differences of the new species with aforementioned species are discussed. In molecular phylogenetic analyses using near full-length small and large subunit ribosomal DNA (SSU and LSU rDNA D2-D3 expansion segments) sequences, the new species fell into a clade including three previously described/sequenced species of the genus in both SSU and LSU Bayesian phylogenetic trees.
Highlights
Seinura (Fuchs, 1931) is a member of the family Aphelenchoididae (Skarbilovich, 1947) and is known for its predatory behavior on other nematode species
The present study describes a new Seinura species isolated from medium soil of imported Olea europaea L. from Italy
Based on the combination of (i) excretory pore at the base of metacarpus or slightly anterior, (ii) long post-uterine sac (PUS) occupying over half of the vulva-anus distance; and (iii) elongate conoid tail with narrower distal region, the new species is similar to the following species of the genus: S. caverna (Kanzaki et al, 2018), S. chertkovi (Dmitrenko, 1966), S. christiei (Goodey, 1960), S. hyrcania (Adeldoost et al, 2016), S. longicaudata (Cobb, 1893; Goodey, 1960), S. persica (Adeldoost et al, 2016), S. steineri (Hechler and Taylor, 1965), and S. tenuicaudata
Summary
Seinura (Fuchs, 1931) is a member of the family Aphelenchoididae (Skarbilovich, 1947) and is known for its predatory behavior on other nematode species. The two previously described species S. lii (Huang and Ye, 2006) and S. wuae (Huang and Ye, 2006) from China are transferred to Aphelenchoides (Fischer, 1894) and Bursaphelenchus (Fuchs, 1937), respectively (Gu et al, 2017; Kanzaki et al, 2018). The present study describes a new Seinura species isolated from medium soil of imported Olea europaea L. from Italy. With all related species and found to be a new member of the genus, being described as Seinura italiensis n. With all related species and found to be a new member of the genus, being described as Seinura italiensis n. sp
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