Glyphidrilus huailuangensis Chanabun & Panha 2013

Dimensions: body length 91 mm, diameter 2.5 mm in segment 8, 1.9 mm before the clitellar wi in segment 25, 1.8 mm behind wi in segment 31 within the clitellar region. Body cylindrical in anterior part, quadrangular in transverse section behind clitellum. 228 segments. Body colour pale brown with variations from red to pink at adjacent tissues of wi portion in different individuals of newly collected specimens after placement in 30% ethanol for narcotization. Dorsal surface considerably broader than the ventral at posterior end. Clitellar wi on ventro-lateral part of clitellum in 26–30, 2.3 mm in height, and about 2.9 mm in width on both sides. Prostomium zygolobous. Dorsal pores absent. Clitellum annular in 12–32. 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 at 8 and 1.2:0.5:1.6:0.5:1.5 in postclitellar segments. Female pores, male pores, and spermathecal pores not visible. Gm: lateral paired or asymmetrical on bc in 16, 17–24, median paired on aa in 31. Septa 5/6–8/9 thicker, 9/10–14/15 thick and 15/16 to the last segment thin. Gi within 7–8. Intestine enlarged from 13. Dorsal blood vessel aborted anterior to 8. He in 8–11. No distinguishable np in first twelve segments. Sv in 9–12, segment 12 larger than the others. Ov in 13–14. Testis in 10–11. Prostate and accessory glands and sc absent.

The new speciesis known only from the type locality. This species was found on the shore near water in sandy loam topsoil (80% sand, 13.1% silt, 5.6% clay, pH 7.5) and in the water at about 5–10 cm depth. The soil surface was covered with worm casts.