Strombomonas napiformis var. brevicollis form. minor
Taxonomic and ultrastructural study of Trachelomonas Ehr. and Strombomonas Defl. (Euglenophyta) from oxbow lakes in Alabama and Indiana (U.S.A.). Cryptogamie Algologie, 15(4), Novembre 1994: 267-286. 276 [Zoological Record Volume 137]