An annotated key separating foreign earthworm species from the indigenous South African taxa (Oligochaeta: Acanthodrilidae, Eudrilidae, Glossoscolecidae, Lumbricidae, Megascolecidae, Microchaetidae, Ocnerodrilidae and Tritogeniidae) Author Plisko, Jadwiga D. Author Nxele, Thembeka C. text African Invertebrates 2015 2015-12-29 56 3 663 663 http://www.bioone.org/doi/10.5733/afin.056.0312 journal article 10.5733/afin.056.0312 2305-2562 Nematogenia lacuum (Beddard, 1893) Description: Length 25 mm . Grey to slightly brown. Nephropores inconspicuous. Clitellum saddle-shaped on ½13–½26. Septa 5/6–9/10 thickened. Gizzards in segments 6 and 7. Paired calciferous glands in 9. Nephridia avesiculate, first pair in 6. Proandric. Seminal vesicles paired in 12. Spermathecae paired, in 9; duct longer than ampulla. Prostates long. Notes : Noted only twice in RSA , on both occasions in garden soil (Zicsi 1998).