Drawida sp. 3

Shen, Huei-Ping & Yeo, Darren C. J., 2005, Terrestrial Earthworms (Oligochaeta) From Singapore, Raffles Bulletin of Zoology 53 (1), pp. 13-33 : 30

Drawida sp. 3

( Fig. 8 )

Material examined. – 1 immature (aclitellate) specimen (dissected)( ZRC), Turut Track, Kranji Wireless Station , coll. K. K. P. Lim, D. C. J. Yeo & K. L. Yeo, 7 Mar.2003 .

Description. – Small worm, length 40 mm, diameter 1.87 mm. Segments numbering 113. Prostomium prolobous. Setae closely paired, ab = cd, aa slightly smaller than bc, dd greater than 0.5 body circumferences. Spermathecal pores small slits in 7/8, medial to c. Male pores and female pores not visible. Paired white round areas lateral to ab, postsetal on segment X and presetal on segment XI, without distinctly demarcated margins. Other genital markings or protuberances not visible. Preserved specimen pale grey.

Septa 5/6-7/8 muscular. Gizzard in XV, round, yellowish. Hearts VI-IX. Nephridia holoic. Testis sacs one pair in X, small, oval, smooth, about 0.45 mm in length. Sperm duct compact and heavily twisted, with a short, slender, straight distal end connecting to male atrium ( Fig. 8 ). Male atrium small, follicular portion about 0.35 mm in length, lower bulge round, white, about 0.3 mm in diameter, immediately adjacent to 10/11 segmental furrow. Accessory glands absent. Ovaries not visible. Two pairs of large, yellowish fat tissues present: anterior pair in X-XI and posterior pair asymmetrical (left one in XII-XV and right one in XII-XIII). Spermathecae not visible.

Remarks. – The specimen is too small and immature for species identification.

Figures

Fig. 8. Drawida sp. 3. Dorsal view of right testis sacs (ts), sperm duct (sd), and male atrium (ma).