Promumtazium pyxidorum Siddiqi, 1982

Ahmad, Wasim, Park, Byeong-Yong, Lee, Jae-Kook & Choi, Dong-Ro, 2009, Some new and known species of Tylencholaimoidea (Nematoda: Dorylaimida) from Korea, Journal of Natural History 43 (37 - 38), pp. 2329-2356 : 2346

Promumtazium pyxidorum Siddiqi, 1982

( Figures 4K–O ; Table 5)

Description

Female. Lip region low, cap-like, offset by constriction, about three times as wide as high and about one-third as wide as body width at neck base. Lips rounded; labial and cephalic papillae not interfering with the labial contour. Amphid aperture small, slitlike, with aperture about one-third as wide as lip region width. Odontostyle small, fusiform, asymmetrical, dorsal arm slightly arcuate, 0.6 times lip region width long. Odontophore rod-like, about 1.3 times the odontostyle length. Guiding ring single, at 0.6 times lip region width from anterior end. Pharyngeal expansion gradual; expanded portion occupying about 45% of total neck length. Cardia short, conoid. Genital system didelphic–amphidelphic; both sexual branches almost equally developed. Tail short conoid to an obtusely rounded terminus, with a distinct terminal caudal pore.

Male. Not found.

Habitat and locality

Soil around roots of forest trees from Heugsando, Jeollanam-do, South Korea.

Remarks

Siddiqi (1982) described P. pyxidorum from Colombia. Ahmad and Araki (2003) redescribed it from Japan. We recorded a single specimen of this rare nematode species from a soil sample collected from Heugsan-Do. The Korean specimen is very similar to the Japanese specimen except for having a much smaller prerectum (3.2–3.8 times anal body width in Japanese specimens).

Figures

Figure 4. (A–E) Tylencholaimus sp. (A) Anterior region; (B) anterior end showing amphid; (C) expanded part of pharynx; (D) female genital system; (E) female posterior region. (F–J) Tylencholaimus intermedius Peña-Santiago and Coomans, 1996. (F) Anterior end; (G) anterior end showing amphid; (H) expanded part of pharynx; (I) female genital region; (J) female posterior region.(K–O) Promumtazium pyxidorum Siddiqi, 1982. (K) Anterior region; (L) anterior end showing amphid; (M) expanded part of pharynx; (N) female genital system; (O) female posterior end.