Schrankiana formosula Freitas, 1959

Aguiar, Aline, Morais, Drausio Honorio, Firmino Silva, Lidiane A., Anjos, Luciano Alves Dos, Foster, Ottilie Carolina & Silva, Reinaldo José Da, 2021, Biodiversity of anuran endoparasites from a transitional area between the Atlantic Forest and Cerrado biomes in Brazil: new records and remarks, Zootaxa 4948 (1), pp. 1-41 : 8

Schrankiana formosula Freitas, 1959

Hosts (prevalence; range): L. fuscus (13/50; 51–794).

Site of infection: large intestine.

Stage: adult.

Type host and type locality: L. fuscus (= Leptodatylus typhonius ), Itaguaí, Rio de Janeiro State, Brazil.

Comments: nematodes of the genus Schrankiana have a long taxonomic history in which they belonged to the family Cosmocercidae as Schrankia by Travassos (1925). After many changes among the genus by some authors, Baker & Vaucher (1988) synonymized the genus with Schrankiana and redescribed S. formosula in L. fuscus and Leptodactylus elenae Heyer from Paraguay. There are eight Schrankiana species described for the Neotropical region ( S. formosula , Schrankiana freitasi Baker , Schrankiana fuscus Baker & Vaucher , Schrankiana larvata (Vaz) , Schrankiana brasili (Travassos) , Schrankiana schranki (Travassos) , Schrankiana incospicata Freitas , and Schran- kiana chacoensis González & Hamann ) ( González & Hamann, 2013). Schrankiana formosula is mainly characterized by ten labial papillae, lateral alae extending beyond the end of the esophagus, pharynx elongate and slender, spicules less than 100 μm long, and gubernaculum less than 55 μm long. However the number and arrangement of caudal papillae can range from seven pairs (see Freitas 1959) to 12-13 pairs (see Baker & Vaucher 1988) ( González & Hamann 2013). We found these characters in the most of specimens, except the number of labial and caudal papillae which were not the same in all specimens; maybe it is necessary to use a Scanning Electron Microscope to analyse these papillae. Through some records in South America (eg. Campi„ o et al. 2016; Graça et al. 2017; Lins et al. 2017), we can see a close relationship among leptodactylid anurans and this nematode species.