Amynthas Kinberg 1867

Aspe, Nonillon M., Manasan, Rafael Ethan, Manlavi, Albert B., Patiluna, Ma. Lotus E., Sebido, Maria Asela B., Obusan, Marie Christine M., Simbahan, Jessica F. & James, Samuel W., 2021, The earthworm fauna of Palawan, Philippines with description of nineteen new pheretimoid species (Clitellata: Megascolecidae), Journal of Natural History 55 (11 - 12), pp. 733-797 : 777

Genus Amynthas Kinberg 1867

Type species

Amynthas aeruginosus, Kinberg 1867 .

Generic diagnosis

Body circular in cross section, with numerous setae regularly arranged equatorially around each segment; setae absent on first and last segments. Male pores paired and superficial, opening on xviii. Spermathecal pores small or large, usually paired (bithecate) but occasionally numerous (polythecate) or single (monothecate). Spermathecal pores positioned either intersegmentally or intrasegmentally between 4/5 and 8/9. Clitellum annular, covering three segments from xiv to xvi. Single female pore midventrally on xiv. Genital markings present or absent. If genital markings present, variable in number and forming complex pattern on segments near male pores. Oesophageal gizzard usually originating in viii; oesophageal bursae lacking; pair of caeca originating in xxvii, extending forward. Ovaries and funnels free in xiii. Male sexual system holandric, metandric or proandric. Spermathecae a single pair or multiple pairs, sometimes single and located midventrally, or sometimes lacking. Nephridia on spermathecal duct lacking. One pair of prostate glands, racemose. Copulatory bursae lacking.