Abstract
Five new and six known species belonging to the genus Basirotyleptus collected from the Western Ghats, India, are described and illustrated. Basirotyleptus conicaudatus sp. nov. is characterized by having 0.42–0.44 mm long body; odontostyle 9.5–10.0 μm, odontophore 11.5–12.0 μm; pharyngeal bulb pear-shaped, 14–15% of total neck length; female genital system mono-opisthodelphic; tail conoid with acute terminus. Basirotyleptus constrictus sp. nov. is characterized by having 0.38–0.49 mm long body; perioral disc distinct; odontostyle 9–10 μm, odontophore 14–15 μm; pharyngeal bulb pear-shaped, 15–17% of total neck length; female genital system mono-opisthodelphic; tail rounded to conoid. Basirotyleptus goaensis sp. nov. is characterized by having 0.73–0.87 mm long body; odontostyle 13.0–14.5 μm, odontophore 15.0–17.5 μm; pharyngeal bulb pyriform, 16–18% of total neck length; female genital system mono-opisthodelphic; tail rounded. Basirotyleptus neocaudatus sp. nov. is characterized by having 0.31–0.44 mm long body; odontostyle 7.5–9.5 μm, odontophore 10–13 μm; pharyngeal bulb pear-shaped, 14–19% of total neck length; female genital system mono-opisthodelphic; tail conoid with acute terminus. Basirotyleptus siddiqii sp. nov. is characterized by having 0.36 mm long body; odontostyle 7.5–8.0 μm, odontophore 10.0–10.5 μm; pharyngeal bulb pear-shaped, 15–16% of total neck length; female genital system mono-opisthodelphic; tail conoid. Six known species viz., B. basiri, B. pini, B. nindei, B. ethiopicus, B. acus, B. minutus are also described and illustrated. Along with light microscopic study, line drawings, compendium and key to species of Basirotyleptus are also provided.
Highlights
The genus Basirotyleptus is a soil-inhabiting nematode taxon proposed by Jairajpuri (1964) with B. basiri as its type species from Assam, India, under the family Leptonchidae Thorne, 1964
Diagnosis Basirotyleptus goaensis sp. nov. is characterized by having 0.73–0.87 mm long body; lip region cap-like, offset by deep constriction; lips rounded, slightly angular, separated, inner part elevated; odontostyle 13.0–14.5 μm long, odontophore 15.0–17.5 μm long, total stylet length 28.5–31.0 μm; pharynx with a slender anterior part, expanding gradually into a short pyriform basal bulb, occupying about 16–18% of total neck length; female genital system monodelphic-opisthodelphic; anterior genital branch reduced to a simple sac, 24.5–46.0 μm or 1.0–1.6 times midbody diameter long, tail short, rounded to conoid, 0.7–0.8 times anal body diameter long
Basirotyleptus is a taxon of soil-inhabiting nematodes, mostly occurring in undisturbed natural soils, and due to the presence of delicate odontostyle, it is considered as fungal feeders (Yeates 2007)
Summary
The genus Basirotyleptus is a soil-inhabiting nematode taxon proposed by Jairajpuri (1964) with B. basiri as its type species from Assam, India, under the family Leptonchidae Thorne, 1964. Siddiqi & Khan (1964) proposed a genus Trichonchium with Trichonchium archium as its type species and T. eximium another species from Assam, India. Siddiqi & Khan (1965) synonymized Trichonchium archium Siddiqi & Khan, 1964 with B. basiri the genus Trichonchium became a junior synonym of Basirotyleptus due to priority of publications of the later They (Siddiqi & Khan 1965) added two more species B. pini and B. coronatus from India and provided a key for the identification of species. Andrássy (2009) in his book accepted Aculonchus as a valid genus and considered Trichonchium as separate genus from Basirotyleptus with T. eximium (Siddiqi & Khan, 1964) as its type because of the presence of prodelphic female genital system.
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