Fig. 18 in New Taxa And Cryptic Species Of Neotropical Snakes (Xenodontinae), With Commentary On Hemipenes As Generic And Specific Characters

Fig. 18. Hemipenis of Xenodon rabdocephalus, sensu stricto. Right retracted organ of AMNH R-3609, from Bahia, Brazil; designated lectotype herein). Abbreviations: AD, apical disc; ADW, apical disc wall or lip; Mus, dorsal and ventral slips of the major retractor muscle; SB, branch of sulcus spermaticus; SS, sulcus spermaticus below fork; STB, smooth terminal basin.