Glyphidrilus jacobsoni Michaelsen 1922

Dimensions: body length 101+ mm. Body cylindrical in anterior part, quadrangular in transverse section behind clitellum. 135+ segments. Body colour pale brown. At posterior end dorsal surface considerably broader than the ventral. Clitellar wi on ventro-lateral part of clitellum in 21–¾27. Prostomium zygolobous. Dorsal pores absent. Clitellum annular in 18–31. Four pairs of setae per segment from 2, setal formula aa:ab:bc:cd:dd = 1.0:0.5:1.5:0.5:1.0 in segment 8. Female pores, male pores and spermathecal pores not visible. Gm: lateral paired or asymmetrical on bc in 18–20, median unpaired on aa in 13–14. Septa 5/6–8/9 thicker, 9/10–11/12 thick and 12/13 to the last segment thin. Gi small, globular within 8. Intestine enlarged from 15. Dorsal blood vessel anterior to 8. He in 8–11. No distinguishable np in first eleven segments. Sv in 9–12, with the pair in segment 12 larger than the others. Ov in 13–14. Testis in 10–11. Prostate and accessory glands absent. Sc in 12/13–16/17, four on each side per segment.