Axonchium parasaccatum Rahman, Jairajpuri & Ahmad 1985
Creators: name: Naz, Tabbasam
name: Ahmad, Wasim
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Nematoda
Adenophorea
Dorylaimida
Belondiridae
Axonchium
Axonchium parasaccatum

description: Axonchium parasaccatum Rahman, Jairajpuri & Ahmad, 1985
(Figs. 9–10)
Measurements. Table 5.
Description. Female: Cuticle 4–5 µm thick at mid body and 10–12 µm on tail. Lateral chords about one-sixth as wide as body width at mid body.
Lip region offset, about one-fifth of body width at neck base. Amphids cup-shaped, their aperture about twothirds of lip region width. Odontostyle about one lip region width long. Odontophore 1.2–1.3 times the odontostyle length. Anterior part of pharynx muscular, separated from the posterior expanded part by a deep constriction, the latter occupying about 56–69% of total neck length. Cardia clavate, less than half of the corresponding body width long.
Anterior genital branch represented by a long uterine sac, 2.8–4.7 times the corresponding body width, filled with sperms. Posterior branch well developed; ovary reflexed, not reaching the oviduct-uterus junction, measuring 100–130 µm; oviduct 100–120 µm, consisting of a long slender part with prismatic cells and a slightly wider pars dilatata with clear lumen, its inner part more refractive, being encircled by a muscular ring. Uterus measuring 60–110 µm, demarcated into distal expanded part with clear lumen and proximal narrower part with obscure lumen. Vagina slightly bent posteriad, extending inwards about half of the corresponding body width; pars proximalis vaginae 20 µm long, surrounded by circular muscles; pars refringens vaginae absent; pars distalis vaginae well developed 10 µm long with rounded walls. Prerectum 6.4 anal body widths long. Rectum about one anal body width long. Tail short hemispheroid, 0.8 times anal body width in length. Caudal pores two on each side.
Male: Spicules arcuate, ventrally curved, with straight and narrow distal ends, 1.4–1.5 times cloacal body width long. Lateral guiding pieces rod-like, with distal bifurcated ends, about one-third of the spicules length. Supplements, an adcloacal pair and five ventromedians arranged in two groups of three and two, starting above the range of spicules. Prerectum 6.5–7 times cloacal body width long. Rectum about one cloacal body width. Tail similar to female, 0.8–0.9 times the cloacal body width long. Caudal pores two on each side.
Habitat and locality. Soil around the forest trees (unidentified) from Kaziranga National Park, Assam, India. GPS coordinate 26.64071/93.39958; latitude 26o36’N, longitude 93o28’E.
Remarks. Rahman et al. (1985) described this species from Arunachal Pradesh, India. The present population conforms well to the original description except for having a slightly longer and more robust body (vs L = 1.8–2.03 mm; a = 47–51) and five ventromedian supplements (vs four). A paratype female and a male of this species available in the Department of Zoology, Aligarh Muslim University were also examined. Though they fit the original description, the shape of spicule was slightly different from the original illustration (Fig 4 J of Rahman et al, 1985). It has been redrawn from the original specimens (Fig 9 M). This species is closely related to A. saccatum Jairajpuri, 1964 and A. metobtusicaudatum (Schuurmans Stekhoven & Teunissen, 1938) Nair & Coomans, 1973. From the former, it differs in having posteriorly directed vagina (vs straight), larger and differently shaped spicules (vs spicules with broad and truncate distal ends) and fewer ventromedian supplements (vs 9–11), and from the latter in having a more posteriorly located vulva (vs 50–53%), in the shape of spicules (vs distal ends more thickened and provided with posterior projection) and lateral guiding pieces (vs rod-like with bifid ends), and in the number of ventromedian supplements (vs 6–8).
description: Published as part of Naz, Tabbasam & Ahmad, Wasim, 2012, Description of two new and five known species of the genus Axonchium Cobb, 1920 (Nematoda: Dorylamida) from India with diagnostic compendia and keys to species of the genera Axonchium and Syncheilaxonchium Coomans & Nair, 1975, pp. 1-37 in Zootaxa 3264 on pages 20-23, DOI: 10.5281/zenodo.215075