title: Taxonomic status and morphological variation of Hydrodynastes bicinctus (Hermann, 1804) (Serpentes: Dipsadidae).
abstract: Hydrodynastes bicinctus was described with no type material or locality and it has two subspecies currently recognized that are not taxonomically well defined. We tested the validity of the two subspecies through meristic, morphometric, and color pattern characters. Two apparently distinct color patterns of H. bicinctus were noticed, one from the Cerrado open formations and the other from the Amazon rainforest. These aforementioned patterns, however, exhibited a high degree of geographic overlap and many specimens showed a blended pattern. Based on these results we propose synonymizing H. bicinctus schultzi with the nominal taxon. Furthermore, we designate a neotype for the species, present data on geographic distribution, and provide morphological descriptions of the hemipenis, cephalic glands, and skull.
authors.affiliation: Departamento de Vertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, Rio de Janeiro, 20940-040 RJ, Brazil; Email: robertamfonseca@outlook.com.
authors.forename: Roberta A
authors.initials: RA
authors.lastname: Murta-Fonseca
authors.affiliation: Laboratório Especial de Coleções Zoológicas, Instituto Butantan, Av. Dr. Vital Brazil, 1500, São Paulo, 05503-900 SP, Brazil; Email: unknown.
authors.forename: Francisco L
authors.initials: FL
authors.lastname: Franco
authors.affiliation: Departamento de Vertebrados, Museu Nacional, Universidade Federal do Rio de Janeiro, Quinta da Boa Vista, Rio de Janeiro, 20940-040 RJ, Brazil; Email: robertamfonseca@outlook.com.
authors.forename: Daniel Silva
authors.initials: DS
authors.lastname: Fernandes
mesh_terms: D063147:Animal Distribution; D000825:Animal Structures / Q000033:anatomy & histology / Q000254:growth & development; D000818:Animals; D049628:Body Size; D017812:Colubridae / Q000033:anatomy & histology / Q000145:classification* / Q000254:growth & development; D005260:Female; D008297:Male; D009929:Organ Size