Earthworms of the ' acaecate' Pheretima group in Vietnam (Oligochaeta: Megascolecidae), with description of a new species from the Mekong delta Author Nguyen, Tung T. Author Tran, Binh T. T. Author Nguyen, Anh D. text Zootaxa 2014 3866 1 105 121 journal article 10.11646/zootaxa.3866.1.5 1c892016-2918-4b05-8eea-9032f9f7c6ff 1175-5326 227564 A3620CFB-E223-479C-8A9B-FF84F30143CF Polypheretima spiridonovi ( Thai , 1996 ) ( Fig. 3 ) Pheretima spiridonovi Thai , 1996 : 3 , Fig. 2 C. Polypheretima spiridonovi — Nakamura 1999 : 7 ; Blakemore 2007 : 93 . Type material. Holotype : 1C (SORC-HV.226) Khanh Hoa Province, Duc Mu pass, 9 January 1989 , coll. Spiridonov S.E. Paratype : 1C (SORC-PV.226), same data as sample SORC-HV.226 ( Thai 1996 ). Description. Body cylindrical. Colour light brown. Prostomium epilobous. Clitellum XIV–XVI. First dorsal pore in 12/13. Setae numerous, regularly distributed on segments, 113 in IV, 136 in XIII, 120 in XXV, aa=1.5–2ab, zz=2–5zy. Male porophore on the bottom of a cone-like depression, about 0.25 body circumference apart. No genital markings in spermathecal and male regions. Numerous spermathecal pores in paired batteries, 6 pairs in 4/ 5, 6 pairs in 6/7 and 7 pairs and a single battery in 5/6. Ampulla heart-shaped, diverticula simple, attaching to duct. Holandric. Testes sacs ventral. Lymph glands absent. Ovaries large on septum 12/13. Intestine beginning at XV, without caeca. Last hearts in XII. Typhlosole simple, lamelliform, T=0.22. Septa 8/9/10 absent, 5/6/7/8 thickened. Pharyngeal micronephridia in 6/7. (Data from Thai 1996 : 3–4.) Records from Vietnam . Khanh Hoa Province ( Duc Mu pass). Distribution. Only known from Vietnam . Remarks. The species is fairly similar to Polypheretima polytheca (Beddard, 1900) but differs in having spermathecal pores in 4/5–6/7, testes sacs in ventral position, absence of a copulatory pouch, and absence of genital markings. Types were rechecked for this study.