Seinura persica Adeldoost, Heydari, Miraiez, Jalalinasab & Asghari, 2016, n. sp.
Creators: name: Adeldoost, Yaser
name: Heydari, Ramin
name: Miraiez, Esmail
name: Jalalinasab, Parisa
name: Asghari, Ramezan
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Secernentea
Aphelenchida
Aphelenchidae
Seinura
Seinura persica

description: Seinura persica n. sp.
(Figs 3 & 4)
Measurements. See Table 1.
Description. Female. Body slender and slightly curved ventrally upon fixation. Cuticle ca 1 µm thick with fine transverse annuli most visible in anterior region. Lateral fields with four incisures. Anterior end set off from body contour by a definite constriction, 3–4 µm high and 6.0–8.5 µm wide. Stylet (18–20) µm long without basal swelling, conus about 41.5% of total stylet length with opening oriented ventrally. Procorpus cylindrical, 1.4–1.8 times longer than stylet length, ending in a muscular, rectangular metacorpus (median bulb), 1.4–1.6 times longer than wide, with anterior granular part occupying 23–30% of its total length and the posterior part moderately muscular with valve posterior to center. Pharyngo-intestinal junction not visible. Glandular region of pharynx well developed, overlapping intestine dorsally, ca 3.2–5.8 times metacorpus length or ca 5.7–6.5 times body diameter at metacorpus level. Excretory pore with little variation in position, mostly between metacorpus base and its valve. Hemizonid not observed. Nerve ring located posterior to metacorpus, surrounding both intestine and pharynx. Reproductive system outstretched with one column of oocytes. Spermatheca mostly oval in shape and frequently filled with sperm. Post-uterine sac 2.6–3.5 times body diameter at vulval region. Vulva not protuberant, vagina slightly oblique. Intestine granulate and ending in a generally functional rectum and a distinct anus. Tail elongateconical 3.3–5.8 times body diameter at the anus, curved ventrally, attenuated asymmetrically, usually has a shallow depression dorsally, ending in a sharply pointed tip.
Male. Body slender, J-shaped after heat relaxation, posterior end more ventrally curved. General body form (i.e. head, stylet, pharynx and excretory pore) as for female. Testis single, expanded anteriorly, not reflexed. Spicules arcuate, separate, ca 1.8 times longer than capitulum width, lamina/calomus complex smoothly and symmetrically curved, rostrum prominent, triangular-shaped with narrowly rounded end, condylus well-developed Seinura persica n. sp. Seinura hyrcania n. sp.
Characters Female Male Gorgan population Guilanpopulation
Holotype Paratypes Paratypes Holotype Paratypes -
– 10 2 12 12
Anal (cloacal) body diam 10.7 10.7 ± 0.7 (10–12) 10, 11 10 11.5 ± 1 (10–14) 9 ± 0.7 (8–10) Tail length 36 46 ± 7 (36–55) 48, 49 56 65 ± 7.2 (51–82) 53 ± 8.4 (43–66) Spicule (chord) – – 16,15 – – –
Conus length/stylet length (%). 2: Median bulb from anterior end/pharynx length (%). 3: Post-uterine sac length. 4: Post-uterine sac length/vulva to anus (%).
and slightly dorsally bent. Distal end of spicules bluntly rounded, cucullus absent. A total of seven papillae present: a single midventral precloacal papilla (P1), one pair subventral papillae (P2) at level of or just posterior to cloacal aperture and two subventral pairs of postcloacal papillae (P3 & P4) being located adjacent to the tail end. Tail conical, ending in a long ventral mucron ca 9–10 µm length with a pointed tip.
Diagnosis and relationships. The female of Seinura persica n. sp. is characterized by a distinctly offset lip region, four incisures in lateral field, length of stylet 18–20 µm and lacking basal swelling, excretory pore opening between base of the metacorpus and its valve, post-uterine sac occupying 65.2 (57–81) % of vulva-anus distance, and elongate-conical tail with pointed tip and length 3.3–5.5 times body diameter at the anus region. Based on presence of post uterine sac, plain base of stylet and V ratio, the new species is close to S. obscura Grewal, Siddiqi & Atkey, 1992, S. onondagensis Kaisa, 2000, S. oswegoensis Van der Linde, 1938 and S. oostenbrinki Husain & Khan, 1967.
Compared with S. obscura, the new species differs by position of excretory pore (opening anterior to vs posterior to base of metacorpus), shorter stylet 19.5 (18–20) vs 24 (20–26) µm, longer post-uterine sac 54.8 (50– 60) vs 22 (18–30) µm and female tail shape (elongate-conical with pointed tip vs elongate with a filiform terminus). Seinura persica n. sp. can be distinguished from S. onondagensis by having an offset cephalic region vs continuous, longer post-uterine sac 54.8 (50–60) vs (14–38) µm, shape of the tail terminus (pointed vs filiform) and lower c´ratio 4.4 (3.3–5.5) vs 8 (7.0–9.0). Compared to S. oswegoensis (data from Grewal et al., 1991) the new species differs in having a shorter tail length 46 (36–55) vs 68 (56–80) µm, shape of the tail terminus (pointed vs filiform), and arrangement of oocytes (in a single column vs 3–4 columns).The new species can be distinguished from S. oostenbrinki by position of excretory pore (anterior to vs posterior to base of metacorpus), arrangement of oocytes (in a single column vs two columns), and longer post-uterine sac (occupying 57–81% of vulva-anus distance vs 33–50%).
Type host and locality. Seinura persica n. sp. was collected from bark samples of a cypress tree (Cupressus sempervirens L.) in Bovan canyon, Nurabad city, Fars Province (GPS coordinates: N 30° 04', E 51° 64'), Iran.
Type material. Holotype female (Slide ASP001), three paratype females and two paratype males (Slides ASP001, ASP002 and ACI003) deposited in the nematode collection of the Department of Plant Protection, College of Agriculture and Natural Resources, University of Tehran, Iran. Three paratype females deposited at the nematode collection of the Royal Belgian Institute of Natural Sciences, Brussels. Two paratype females deposited at the National Nematode Collection of the Department of Nematology, Iranian Research Institute of Plant protection, Tehran, Iran.
Etymology. The species epithet refers to Latin name of Iran, the origin of the species, from where the type specimens were collected.
description: Published as part of Adeldoost, Yaser, Heydari, Ramin, Miraiez, Esmail, Jalalinasab, Parisa & Asghari, Ramezan, 2016, Description of two new species of Seinura Fuchs, 1931 (Nematoda: Aphelenchoididae) from Iran, pp. 541-556 in Zootaxa 4168 (3) on pages 545-549, DOI: 10.11646/zootaxa.4168.3.6, http://zenodo.org/record/265415