Drawida sp. 1
|
publication ID |
https://doi.org/ 10.5281/zenodo.13244835 |
|
persistent identifier |
https://treatment.plazi.org/id/0D51326D-B678-FFFC-9F17-FDD3439B93DF |
|
treatment provided by |
Felipe |
|
scientific name |
Drawida sp. 1 |
| status |
|
( Fig. 6 View Fig )
Material examined. – 6 immature (aclitellate) specimens (3 amputated, 1 dissected)( ZRC), Rifle Range Rd. opposite to Murnane Reservoir, 5 Mar.2003 ; 1 immature specimen ( ZRC), Upper Seletar Reservoir Park outside Nee Soon Rifle Range, 5 Mar.2003 ; 3 immature (aclitellate) specimens ( ZRC), Rifle Range Rd. opposite to Murnane Reservoir, 25 Jun.2003 . All the above specimens were collected by K. K. P. Lim, D. C. J. Yeo & K. L. Yeo.
Description. – Length 59-92 mm (amputated specimens not included), weight 0.35-0.61 g, diameter 2.7-3.8 mm. Segments numbering 119-168. Prostomium prolobous. Dorsal pores absent. Setae closely paired, ab = cd, aa = 0.7 bc, dd greater than 0.5 body circumferences. Clitellum not recognizable on any of the specimens. Spermathecal pores one pair in 7/8, medial to c, edge wrinkled ( Fig. 6A View Fig ). Male pores on teat-like protuberances from transversely oval areas across 10/11 ( Fig. 6B View Fig ). Female pores in 11/12. A pair of round epidermis thickening postsetal on segment X, lateral to b, each area about 0.55 mm wide, one transversely oval area often present between male porophores on XI, about 0.98 mm in width. Preserved specimens pale grey.
Septa 5/6-7/8 muscular, 8/9 thick. Gizzards five in XIV-XVIII, large, round, yellowish. Hearts VI-IX. Nephridia holoic. Testis sacs one pair, large, extending into IX and X, smooth, yellowish, elongated oval, 1.61-1.7 mm in length, about 0.95 mm in width. Sperm duct in form of a large mass of white twisted tubes ( Fig. 6D View Fig ). Male atrium tubular, coiled into a compact, circular shape about 0.85 mm in length and 0.75 mm in width, not bound to the body wall, ectal end finely granulated, connecting to outside male opening. Accessory glands absent. Ovaries not visible. One pair of ovisacs extending from septum 11/12 to segment XIII. Spermathecae lying on anterior face of septum 7/8, ampulla spindle-shaped and wrinkled, about 1.64 mm long, 0.95 mm wide, with a stout, wrinkled, slightly bent stalk connecting to the spermathecal atrium, the atrium about 0.65 mm in length ( Fig. 6C View Fig ).
Remarks. – Drawida sp. 1 is similar to Drawida rara (see Gates, 1925, 1926a, d) in structure of male protuberances. However, the structure and position of genital markings are different. Drawida sp. 1 has a pair of round epidermis thickenings lateral to b on segment X, whereas D. rara has a small, circular papilla slightly external to each male protuberance and/or a transversely crescent-shaped area postsetal on VIII or presetal on IX, X, or XI (cf. Gates, 1925, 1926a, d). In addition, Drawida sp. 1 has sperm ducts in the form of large masses of twisted tubes, whereas D. rara has short, slender, slightly coiled sperm ducts ( Gates, 1925, 1972).
The characters of the sperm duct (vas deferens) and male atrium (prostate) described for Drawida sp. A (see Gates, 1935, 1936a) from the Malay Peninsula are similar to Drawida sp. 1 of this study. However, the juvenile specimen of Drawida sp. A has small testis sacs, small spermathecal ampullae and no genital marking. These characteristics are probably due to its immaturity. Drawida sp. 1 has male pores on protuberant porophores whereas this is not observed for Drawida sp. B (see Gates, 1936a) and D. malayana (see Gates, 1938).
| ZRC |
Zoological Reference Collection, National University of Singapore |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.