Gillies 1991. A diphyletic origin for the two-tailed baetid nymphs occurring in East African stony streams with a description of the new genus and species Tanzaniella spinosa gen. nov. sp. nov. Alba-Tercedor, J.; Sanchez-Ortega, A.[Eds]. Overview and strategies of Ephemeroptera and Plecoptera., Sandhill Crane Press, Inc., Gainesville, Florida, 1991: i-xiv, 1-588. Chapter pagination: 175-187