Basirotyleptus nindei Siddiqi 1970
Creators: name: Islam, Md Niraul
name: Ahmad, Wasim
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Enoplea
Dorylaimida
Leptonchidae
Basirotyleptus
Basirotyleptus nindei

description: Basirotyleptus nindei Siddiqi, 1970
Fig. 3, Table 3
Basirotyleptus nindei Siddiqi, 1970: 203–205.
Material examined
INDIA – Kerala State • 11 ♀♀; Pathanamthitta district, Thannithodu forest; 9º15′21.6″ N, 76º55′19.2″ E; 5–15 cm depth; 1 Nov. 2017; soil samples collected from around the roots of shrubs (unidentified); slides reference number AMU/ZD/NC/ Basirotyleptus nindei /1–4 • 7 ♀♀; Ernakulum district, Manikandanchal; 10º09′28.8″ N, 76º47′56.4″ E; 5–15 cm depth; 28 Oct. 2017; soil samples collected from around the roots of shrubs (unidentified); slides reference number AMU/ZD/NC/ Basirotyleptus nindei /5–7.
Description
Female
Small sized nematodes, slightly curved ventrad or open C-shaped upon fixation; body cylindrical tapering gradually towards both extremities but more so towards the anterior end. Cuticle with two distinct layers, 1.0–1.5 µm thick at anterior region, 1.5–2.0 µm at midbody and 2.5–3.0 μm on tail. Outer cuticle thin, with fine transverse striations; inner layer thick, finely striated, loose, its outline irregular, with distinct radial refractive elements. Lateral chords occupying about 29–35% of midbody diameter. Lateral body pores distinct; 1–2 in neck region; 1–2 from pharyngeal base to vulva; 2–4 in post-vulval region. Dorsal and ventral body pores indistinct. Lip region cap-like, offset by constriction, 1.8–2.1 times as wide as high or about one-third to two-fifths of the body diameter at neck base. Lips angular, separate, inner part elevated. Labial and cephalic papillae distinct but not interfering with labial contour. Amphids stirrupshaped, their aperture about two-fifths to one-half as wide as lip region diameter. Stoma a long, slender truncate cone, slightly sclerotized in the perioral region. Odontostyle slender, solid, needle-like, 1.4–1.5 times the lip region diameter long. Odontophore sclerotized, with prominent basal flanges, about 1.0–1.2 times the odontostyle length. Guiding ring simple, refractive, at 1.2–1.7 times the lip region diameter from anterior end. Pharynx consisting of a slender anterior part, expanding abruptly into a short pearshaped basal bulb, with a perceptible thickening at the posterior part of its inner lining, occupying about 14–18% of total neck length. Nerve ring located at 53–60% of neck length from anterior end. Cardia rounded to conoid, about one-fourth to one-third of the corresponding body diameter long.
Genital system monodelphic-opisthodelphic. Ovary reflexed, measuring 37–84 μm; oocytes arranged in single row except near tip. Oviduct joining the ovary subterminally, measuring 39–81 μm, consisting of a slender distal portion and a well-developed pars dilatata. Oviduct-uterus junction marked by weak sphincter. Uterus short and muscular, measuring 16–25 μm. Anterior genital branch absent or rarely present (n = 7), reduced to a very small sac, about one-fifth to one-fourth midbody diameter long. Sperm cell absent. Vagina cylindrical, extending inwards, 8.5–9.5 μm or about two-fifths to one-half (43–52%) of midbody diameter; pars proximalis vaginae 5.0–7.0 × 4.0–5.0 μm, encircled by circular muscles; pars distalis vaginae 3.0–4.0 μm with slightly curved walls; pars refringens absent. Vulva apparently a transverse slit. Prerectum 2.0–3.1 and rectum 1.0–1.4 times anal body diameter long. Tail short, rounded to conoid, with a pair of caudal pores on each side.
Male
Not found.
Remarks
Siddiqi (1970) described this species from the Malawi. During the present study eighteen females were collected from two different localities of the Western Ghats, India. The morphometrics of present populations conform well with the type population except in having differently shaped amphids (stirrupshaped vs cup-shaped), slightly shorter odontostyle (9.0–10.5 vs 11.0 µm), slightly longer odontophore (10.5–12 vs 10 µm); nerve ring located more posteriorly (53–60 vs 50% of total neck length); sometimes presence of small anterior uterine sac about one-fourth to one-third midbody diameter long (vs anterior sac completely absent) and slightly shorter prerectum (2.0–3.1 vs 3.0–4.0 times anal body diameter). These slight differences are considered as intraspecific variability. This species is reported here for the first time from the India.
description: Published as part of Islam, Md Niraul & Ahmad, Wasim, 2022, Description of five new and six known species of the genus Basirotyleptus Jairajpuri, 1964 (Nematoda: Dorylaimida: Tylencholaimoidea) from the Western Ghats, India, pp. 1-57 in European Journal of Taxonomy 791 (1) on pages 10-13, DOI: 10.5852/ejt.2022.791.1645, http://zenodo.org/record/5999842