Abstract
Pseudobunocephalus timbira, new species, is described from streams of the lower Tocantins and the Mearim river drainages, in North and Northeast of Brazil. Pseudobunocephalus timbira can be distinguished from all congeners by having the second hypobranchial and the third basibranchial cartilaginous (vs. ossified). Additionally, it can be dintinguished from P. lundbergi by the following putative apomorphic features within Pseudobunocephalus: posterolateral process of premaxilla present (vs. absent); bony knobs in dorsal lamina of Weberian apparatus absent (vs. present); distal end of posterior margin of 5th parapophysis not enlarged (vs. enlarged); number of ribs three (vs. four or five) and infraorbital sensory canal entering neurocranium via frontal (vs. via sphenotic). It is distinguished from P. bifidus and P. iheringii by having a gracile body not surpassing 34 mm SL (vs. robust body, reaching up to 59 mm SL, respectively); by having the posterior margin of cranial fontanel concave (vs. posterior margin somewhat straight with parieto-supraoccipital extending anteriorly); by having a conspicuous knobby ornamentation on dorsal surface of skull (vs. skull knobs slightly pronounced); by having Weberian ventral blade of hemal canal opened (vs. closed) and by the absence of serrations on the proximal portion of the anterior margin of pectoral-fin spine (vs. serrations covering entire anterior margin of the pectoral spine). Additionally, it can be distinguished from P. amazonicus, P. rugosus and P. quadriradiatus, by having the posterolateral mental barbel with at least one fleshy lobe located proximally along the posterior margin (vs. posterolateral mental barbel simple, not having fleshy lobes). It also differs from P. amazonicus and P. rugosus by having five branchiostegal rays (vs. four). It also can be distinguished from P. amazonicus by having the contact of hyomandibula cartilage with neurocranium limited to the sphenotic (vs. extending to both sphenotic and pterotic); by having the ventral blade of Weberian apparatus open (vs. closed) and by anterior exit of hemal canal in abdominal vertebra (vs. in complex vertebra); from P. rugosus by coloration of proximal portion of caudal fin similar to rest of caudal fin (vs. clear patch) and from P. quadriradiatus by the total number of pectoral fin-rays six (vs. five). Variable characteristics within Pseudobunocephalus species are summarized and comments on the phylogenetic relationships and the disjunct distribution of the new species are made. [Species zoobank url: urn:lsid:zoobank.org:act:392F95E0-86E1-4386-8779-C4F71098DBCC]
References
Boulenger, G.A. (1891) An account of the siluroid fishes obtained by Dr. H. von Ihering and Herr Sebastian Wolff in the Province Rio Grande do Sul, Brazil. Proceedings of the Zoological Society of London, 1891, 231–235.
Burgess, W.E. (1989) An atlas of freshwater and marine catfishes. A preliminary survey of the Siluriformes. T.F.H. Publications, Neptune City, New Jersey, 784 pp.
Cardoso, A.R. (2008) Filogenia da família Aspredinidae Adams, 1854 e revisão taxonômica de Bunocephalinae Eigenmann & Eigenmann, 1888 (Teleostei: Siluriformes: Aspredinidae). PUCRS, Porto Alegre, 259 pp.
Cardoso, A.R. (2010) Bunocephalus erondinae, a new species of banjo catfish from southern Brazil (Siluriformes: Aspredinidae). Neotropical Ichthyology, 2010, 607–613.
https://doi.org/10.1590/S1679-62252010000300005
Carvalho, T.P., Cardoso, A.R., Friel, J.P. & Reis, R.E. (2015) Two new species of the banjo catfish Bunocephalus Kner (Siluriformes: Aspredinidae) from the upper and middle rio São Francisco basins, Brazil. Neotropical Ichthyology, 13, 499–512.
https://doi.org/10.1590/1982-0224-20140152
Carvalho, T.P., Reis, R.E. & Sabaj, M.H. (2017) Description of a new blind and rare species of Xyliphius (Siluriformes: Aspredinidae) from the Amazon basin using high-resolution computed tomography. Copeia, 105, 14–28.
https://doi.org/10.1643/CI-16-456
Carvalho, T.P., Arce, H.M., Reis, R.E. & Sabaj, M.H. (2018) Molecular phylogeny of Banjo catfishes (Ostaryophisi: Siluriformes: Aspredinidae): A continental radiation in South American freshwaters. Molecular Phylogenetics and Evolution, 127, 459–467.
https://doi.org/10.1016/j.ympev.2018.04.039
Cracraft, J. (1983) Species concepts and speciation analysis. Current Ornithology, 1, 159–187.
https://doi.org/10.1007/978-1-4615-6781-3_6
Dahdul, W.M., Lundberg, J.G., Midford, P.E., Balhoff, J.P., Lapp, H., Vision, T.J., Haendel, M.A., Westerfield, M. & Mabee, P.M. (2010) The teleost anatomy ontology: anatomical representation for the genomics age. Systematic Biology, 59, 369–383.
https://doi.org/10.1093/sysbio/syq013
Eigenmann, C.H. & Allen, W.R. (1942) Fishes of Western South America. I. The Intercordilleran and Amazonian lowlands of Peru. II. The high pampas of Peru, Bolivia, and Northern Chile; with a revision of the Peruvian Gymnotidae, and of the genus Orestias. University of Kentucky, Lexington, Kentucky, 494 pp.
Eigenmann, C.H. & Kennedy, C.H. (1903). On a collection of fishes from Paraguay, with a synopsis of the American genera of cichlids. Proceedings of the Academy of Natural Sciences of Philadelphia, 55, 497–537.
Eschmeyer, W.N., Fricke, R. & van der Laan, R. (Eds.) (2018) Catalog of fishes: genera, species, references. San Francisco, California Academy of Sciences. Available from: http://researcharchive.calacademy.org/research/ichthyology/catalog/fishcatmain.asp (accessed 20 August 2018)
Friel, J.P. (1994) A phylogenetic study of the Neotropical banjo catfishes (Teleostei: Siluriformes: Aspredinidae). Duke University, Durham, 256 pp.
Friel, J.P. (1995) Acanthobunocephalus nicoi, a new genus and species of miniature banjo-catfish from the upper Orinoco and Casiquiare Rivers, Venezuela (Siluriformes: Aspredinidae). Ichthyological Explorations of Freshwaters, 6, 89–95.
Friel, J.P. (2003) Family Aspredinidae (Banjo catfishes). In: Reis, R.E., Kullander, S.O. & Ferraris, C.J. (Eds.), Check List of the Freshwater Fishes of South and Central America. EDIPUCRS, Porto Alegre, pp. 261–267.
Friel, J.P. (2008) Pseudobunocephalus, a new genus of banjo catfish with the description of a new species from the Orinoco River system of Colombia and Venezuela (Siluriformes: Aspridinidae). Neotropical Ichthyology, 6, 293–300.
https://doi.org/10.1590/S1679-62252008000300001
Friel, J.P. & Carvalho, T.P. (2016) A new species of Amaralia Fowler (Siluriformes: Aspredinidae) from the Paraná-Paraguay river basin. Zootaxa, 4088 (4), 531–546.
https://doi.org/10.11646/zootaxa.4088.4.4Friel, J.P.& Carvalho, T.P. (2017) Family Aspredinidae-Banjo Catfishes. In. van der Sleen, P. & Albert, J.S. (Eds.), Field Guide to the Fishes of the Amazon. University Press, Princeton, pp. 464.
Guimarães, E.C., de Brito, P.S., Ferreira, B.R.A. & Ottoni, F.P. (2018) A new species of Charax (Ostariophysi, Characiformes, Characidae) from northeastern Brazil. Zoosystematics and Evolution, 94, 83–93.
https://doi.org/10.3897/zse.94.22106
IUCN Standards and Petitions Subcommittee (2017) Guidelines for Using the IUCN Red List Categories and Criteria. Version 13. Prepared by the Standards and Petitions Subcommittee. Available from: http://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 10 October 2018)
Jarduli, L.R., Claro-García, A. & Shibatta, O.A. (2014) Ichthyofauna of the rio Araguaia basin, states of Mato Grosso and Goiás, Brazil. Check List, 10, 483–515.
https://doi.org/10.15560/10.3.483
Lundberg, J G. & Baskin, J.N. (1969) The caudal skeleton of the catfishes, Order Siluriformes. American Museum Novitates, 2398, 1–49.
Mees, G.F. (1989) Notes on the genus Dysichthys, subfamily Bunocephalinae, family Aspredinidae (Pisces, Nematognathi). Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen, 92, 189–250.
Mungall, C.J., Torniai, C., Gkoutos, G.V., Lewis, S.E. & Haendel, M.A. (2012) Uberon, an integrative multi-species anatomy ontology. Genome Biology, 13 (R5), 1–20.
Nixon, K.C. & Wheeler, Q.D. (1990) An amplification of the phylogenetic species concept. Cladistics, 6, 211–223.
https://doi.org/10.1111/j.1096-0031.1990.tb00541.x
de Pinna, M.C.C. (1998) Phylogenetic relationships of neotropical Siluriformes (Teleostei: Ostariophysi): historical overview and synthesis of hypotheses. In: Malabarba, L.R., Reis, R.E., Vari, R.P., Lucena, C.A.S. & Lucena, Z.M.S. (Eds.), Phylogeny and classification of neotropical fishes. Edipucrs, Porto Alegre, pp. 279–330.
de Pinna, M.C. & Ng, H.N. (2004) The second ural centrum in Siluriformes and its implication for the monophyly of superfamily Sisoroidea (Teleostei, Ostariophysi). American Museum Novitates, 3437, 1–23.
https://doi.org/10.1206/0003-0082(2004)437%3C0001:TSUCIS%3E2.0.CO;2
de Queiroz, K. (2007) Species concepts and species delimitation. Systematic Biologists, 56, 879–886.
https://doi.org/10.1080/10635150701701083
Sabaj, M.H. (2016) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an Online Reference. Version 6.5. (16 August 2016). Available from: http://www.asih.org/resources/standard-symbolic-codes-institutional-resource-collections-herpetology-ichthyology (accessed 26 February 2018)
Soares, E.D.C. (2005) Peixes do Mearim. São Luís, Instituto Geia, 131 pp.
Taylor, W.R. & Van Dyke, G.C. (1985) Revised procedures for staining and clearing small fishes and other vertebrates for bone and cartilage study. Cybium, 9, 107–119.
Vanscoy, T., Lundberg, J.G. & Luckenbill, K.R. (2015) Bony ornamentation of the catfish pectoral-fin spine: comparative and developmental anatomy, with na example of fin-spine diversity using the Tribe Brachyplatystomini (Siluriformes, Pimelodidae). Proceedings of the Academy of Natural Sciences of Philadelphia, 164 (1), 177–212.
https://doi.org/10.1635/053.164.0107