Species Description: Correia LL, Nunes PMS, Gamble T, Maciel AO, Marques-Souza S, Fouquet A, Rodrigues MT, and Mott T. 2018. A new species of Brasilotyphlus (Gymnophiona: Siphonopidae) and a contribution to the knowledge of the relationship between Microcaecilia and Brasilotyphlus. Zootaxa 4527: 186-196.
At the time of the species description, the Brasilotyphlus genus had three species. Brasilotyphlus dubium differed from B. braziliensis by the former having fewer primary and secondary annular grooves. Brasilotyphlus dubium has 123 - 129 primary annular grooves and 9 - 16 secondary annular grooves while B. braziliensis has 142 - 147 primary annular grooves and 23 - 36 secondary annular grooves. An additional difference between the species is that premaxillary-maxillary teeth reach the posterior edge of the choanae while B. braziliensis teeth does not. Brasilotyphlus dubium differs from B. guarantanus by the number of annular grooves. Brasilotyphlus guarantanus has more primary annuli (151 - 170) and fewer secondary annular grooves (0 - 2) (Correia et al. 2018).
In life, B. braziliensis is pale purple with a slightly pink head. The venter, lateral surfaces, and areas that surround the vent, nostrils, and tentacles are a paler color than the rest of the body. In preservative, the body is brown and is paler on the anterior dorsal portion of the bodies, the ventrum, and lateral surfaces. Additionally, sections that surround the vent, nostrils, lips, tentacles, and the ventral surface anterior to the second collar are less pigmented than the rest of the body (Correia et al. 2018).
There is variation in the robustness of the first nuchal collar making it difficult to tell where the head begins in some individuals. The visibility of the nuchal grooves vary but they are otherwise similar. The terminal keel also varies in distinctiveness between individuals. There are only slight variations in color between the holotype and the paratypes, which is that some of the other specimens that are preserved are a steel grey color but the patterning is similar throughout the specimens (Correia et al. 2018).
Distribution and Habitat
Life History, Abundance, Activity, and Special Behaviors
Maximum Likelihood Analysis and Bayesian Inference of 16S rRNA and cytB show that B. dubium is sister to B. guarantanus. The analysis did not include B. braziliensis. This analysis supported the monophyly of Brasilotyphlus but found that the clade was nested within a paraphyletic Microcaecilia, bringing into question whether Brasilotyphlus is synonomus with Microcaecilia or if Microcaecilia should be split (Correia et al. 2018).
The species epithet “dubium” was chosen as a reference to the dubious certainty of the relationship between the genera Brasilotyphlus and Microcaecilia (Correia et al. 2018).
Brasilotyphlus dubium was found 620 km northwest of the B. braziliensis type locality and 1,500 km northwest of the B. guarantanus type locality (Correia et al. 2018).
Correia, L.L., Nunes, P.M.S., Gamble, T., Maciel, A.O., Marques-Souza, S., Fouquet, A., Rodrigues, M.T., Mott, T. (2018). ''A new species of Brasilotyphlus (Gymnophiona: Siphonopidae) and a contribution to the knowledge of the relationship between Microcaecilia and Brasilotyphlus.'' Zootaxa, 4527(2), 186-196. [link]
Originally submitted by: Melissa Regalado (first posted 2020-07-28)
Edited by: Ann T. Chang (2020-07-28)
Species Account Citation: AmphibiaWeb 2020 Brasilotyphlus dubium <https://amphibiaweb.org/species/8934> University of California, Berkeley, CA, USA. Accessed Jul 24, 2021.
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Citation: AmphibiaWeb. 2021. <https://amphibiaweb.org> University of California, Berkeley, CA, USA. Accessed 24 Jul 2021.
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