Chitwoodielloides japonicus Ahmad and Araki, 2003

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 : 2343-2346

Chitwoodielloides japonicus Ahmad and Araki, 2003

( Figures 6H–L ; Table 4)

Description

Female. Lip region cap-like, offset by constriction, about twice as wide as high or about one-third as wide as body width at neck base. Lips rounded and moderately separated. Amphids cup-shaped, their aperture about half of lip region width. Stoma distinctly sclerotized. Odontostyle long, attenuated, straight or slightly dorsally curved, 2.3–2.7 times the lip region width long, and with small aperture and slightly thickened tip. Odontophore rod-like with distinct basal thickening, 0.80–0.85 times the odontostyle length. Guiding ring single, at 1.4–1.6 times the lip region width from anterior end. Anterior slender part of pharynx weakly muscular; pharyngeal expansion gradual; expanded portion occupying about 50–52% of total neck length. Cardia short, hemispheroid. Genital system didelphic–amphidelphic. Tail short, rounded, conoid to hemispheroid with a pair of caudal pores on each side. A distinct terminal caudal pore always present.

Male. Not found.

Habitats and localities

Soil samples collected from around the roots of forest trees from: (1) Ulleungdo, Gyeongsangbuk-do; (2) Jungmisan Mt Yangpyeong-gun , Gyeongi-do; and (3) Gayasan Mt, near Haeinsa temple, Habcheon-gun, Gyeongsangbuk-do. All localities in South Korea .

Remarks

Ahmad and Araki (2003) described a new genus Chitwoodielloides with the type and only species C. japonicus from forest soil in several localities of Japan. This species seems to be quite commonly distributed in forest soils of Korea. The Korean specimens are very similar to the Japanese population except for some minor differences in morphometrics and for the absence of males. All four populations recorded from Japan had males while in the Korean population no males were present nor were the females impregnated. The odontostyle as well as odontophore length in Korean specimens, though within the range found in Japanese specimens, were on average comparatively smaller. In the Japanese specimens, the odontostyle length varied from 28 to 33 µm (usually about 30 µm), whereas odontophore length ranged from 23 to29 µm (usually about 27–28 µm).

Figures

Figure 6. (A–G) Chitwoodiellus nipponi Ahmad and Araki, 2003. (A,B) Anterior regions; (C) pharyngeal expansion; (D) pharyngo-intestinal junction; (E) vulval region; (F,G) female posterior ends. (H–L) Chitwoodielloides japonicus Ahmad and Araki, 2003. (H) Anterior region; (I) pharyngeal expansion; (J) pharyngo-intestinal junction; (K) vulval region; (L) female posterior end.