Abstract
At the Fish Collection of the Museo de la Escuela Politecnica Nacional (MEPN), Quito, the specimens of the genus Pseudohemiodon were revised and three species were identified. The three species inhabit the Amazon versant of Ecuador. Chronologically the species are: P. lamina (Günther 1868) originally described from Xeberos (Jeberos), Peru; P. apithanos Isbrücker & Nijssen 1978, originally described from the Conejo River, Putumayo River system, Ecuador, and a new species described herein. The new species was caught in the Aguarico River, Napo River system, and is represented by two small sized specimens. It is distinguished from all congeners by the combination of the following characters: abdomen totally covered with small to medium-sized, irregularly shaped plates; absence of small plates, anterior to gill openings; eyes relatively small, and six to seven dark transverse bands, posterior to the dorsal-fin. Isbrücker & Nijssen (1978) indicate the presence of P. laticeps (Regan 1904) in Ecuador; however we didn’t find any specimen of this species. The specimens that could potentially be identified as P. laticeps are large sized specimens of P. apithanos. Some external morphological characters, morphometric and meristic data of analyzed specimens of P. apithanos and P. lamina are provided.
References
Barriga S., R. (2012) Lista de peces de agua dulce e intermareales del Ecuador. Revista Politécnica, 30 (3), 83–119. https://doi.org/10.5962/bhl.title.67474
Bleeker, P. (1862) Atlas ichthyologique des Indes Orientales Nèêrlandaises, publié sous les auspices du Gouvernement colonial nèêrlandaises, Tome II. Siluroîdes, Chacoîdes et Hètèrobranchoîdes. Atlas Ichthyologique des Indes Orientales Nèêrlandaises Amsterdam, 2, 1–112, pls. 49–101.
Boeseman, M. (1971) The «comb-toothed» Loricariinae of Surinam, with reflections on the phylogenetic tendencies within the family Loricariidae (Siluriformes, Loricariidae). Zoologische Verhandelingen, 116, 1–56, pls.1–8.
Covain, R, & Fisch-Muller S. (2007) The genera of the Neotropical armored catfish subfamily Loricariinae (Siluriformes: Loricariidae): a practical key and synopsis. Zootaxa, 1462 (1), 1–40. https://doi.org/10.11646/zootaxa.1462.1.1
Covain, R., Fisch-Muller, S., Oliveira, C., Mol, J.H., Montoya-Burgos J.I. & Dray, S. (2016) Molecular phylogeny of the highly diversified catfish subfamily Loricariinae (Siluriformes, Loricariidae) reveals incongruences with morphological classification. Molecular Phylogenetics and Evolution, 94, 492–517. https://doi.org/10.1016/j.ympev.2015.10.018
Delsmann, H.C. (1941) Résultats scientifiques des croisières du Navire–école Belge «Mercator», III, Pisces, Fishes from the Amazone–River. Mémoires du Musée royal d’histoire naturelle de Belgique, 3 (21), 77–81.
Ferraris Jr., C.J. (2003) Subfamily Loricariinae. In, Reis, R.E., Kullander, S.O. & Ferraris Jr., C.J. (Eds.). Checklist of the freshwater fishes of South and Central America. EDIPUCRS, Porto Alegre, 330–350.
Ferraris Jr., C.J. (2007) Checklist of catfishes, recent and fossil (Osteichthyes, Siluriformes), and catalogue of siluriform primary types. Zootaxa, 1418 (1), 1–628. https://doi.org/10.11646/zootaxa.1418.1.1
Fricke, R., Eschmeyer, W.N. & van der Laan, R. (2022) Eschmeyer’s Catalog of Fishes: Genera, Species, References. Available from: http://researcharchive.calacademy.org/ research/ichthyology/catalog/fishcatmain.asp (accessed 7 Mar 2022)
Günther, A. (1868a) Diagnoses of some new freshwater fishes from Surinam and Brazil, in the collection of the British Museum. Annals and Magazine of Natural History, Series 4, 1 (6), 475–481. https://doi.org/10.1080/00222936808695733
Günther, A. (1868b) Descriptions of freshwater fishes from Surinam and Brazil. Proceedings of the Zoological Society of London, 239, figs. 6–7.
Isbrücker, I.J.H. (1971) Scientific results of the Peru-Bolivia-expedition Dr. K. H. Lüling 1966, Pseudohemiodon (Planiloricaria) cryptodon, a new species and subgenus from Peru (Pisces, Siluriformes, Loricariidae). Bonner Zoologische Beiträge, 21 (3/4), 274–283.
Isbrücker, I.J.H. (1973) Status of the primary homonymus South American catfish Loricaria cirrhosa Perugia, 1897, with remarks on some other loricariids (Pisces, Siluriformes, Loricariidae). Annali del Museo Civico di Storia Naturale di Genova, 79, 172–191.
Isbrücker, I.J.H. (1975) Pseudohemiodon thorectes, a new species of mailed catfish from the Rio Mamoré system, Bolivia (Pisces, Siluriformes, Loricariidae). Beaufortia, 23, 85–92.
Isbrücker, I.J.H. (1980) Classification and catalogue of the mailed Loricariidae (Pisces, Siluriformes). Verslagen en Technische Gegevens, Instituut voor Taxonomische Zoölogie, Universiteit van Amsterdam, 22, 1–181.
Isbrücker, I.J.H. & Nijssen, H. (1978) Two new species and a new genus of neotropical mailed catfishes of the subfamily Loricariinae Swainson, 1838 (Pisces, Siluriformes, Loricariidae). Beaufortia, 27 (339), 177–206.
Kner, R. (1853) Die Panzerwelse des K.K. Hof–naturalien–Cabinetes zu Wien. I. Abtheilung: Loricarinae. Denkschriften der Kaiserlichen Akademie der Wissenschaften in Wien, Mathematisch-Naturwissenschaftliche Classe, 6, 1–34, pls. 1–8. https://doi.org/10.5962/bhl.title.12577
Londoño-Burbano, A. & Reis, R.E. (2021) A combined molecular and morphological phylogeny of the Loricariinae (Siluriformes, Loricariidae), with emphasis on the Harttiini and Farlowellini. PLoS ONE, 16 (3), e0247747. https://doi.org/10.1371/journal.pone.0247747
Morris, P.J., Yager, H.M. & Sabaj Pérez, M.H. (2006) ACSImagebase: A digital archive of catfish images compiled by participants in the All Catfish Species Inventory [Image on the internet]. Available from: http,//acsi.acnatsci.org/base (accessed 8 June 2021)
Provenzano, F. (2011) Estudio sobre las relaciones filogenéticas de las especies incluidas en la subfamilia Loricariinae (Siluriformes, Loricariidae). Unpublished Doctor in Science Dissertation, Universidad Central de Venezuela, Caracas, 266 pp.
Rapp Py-Daniel, L. & Ohara, W.M. (2013) Loricariinae. In: Jardim de Queiroz, L., Torrente–Vilara, G., Massaharu Ohara, W., Henrique Da Silva Pires, T., Zuanon J. & Rodrigues Da Costa Doria, C. (Eds.), Peixes do Rio Madeira. Dialeto Latin American Documentary, SP, Brazil, 2 (33), pp. 224–301.
Regan, C.T. (1904) A monograph of the fishes of the family Loricariidae. Transactions of the Zoological Society of London, 17 (3), 191–351. https://doi.org/10.1111/j.1096-3642.1904.tb00040.x
Rojas-Molina, Y.A., Provenzano-Rizzi, F. & Ramírez-Gil, H. (2019) A new species of whiptail armored catfish, genus Pseudohemiodon (Siluriformes, Loricariidae) from Orinoco River basin, Llanos region of Colombia and Venezuela. Neotropical Ichthyology, 17 (2), e180160. https://doi.org/10.1590/1982-0224-20180160
Roxo F.F., Ochoa, L.E., Sabaj, M.H., Lujan, N.K., Covain, R, Silva, G.S.C., Melo, B.F., Albert, J.S., Chang, J., Foresti, F., Alfaro, M.E. & Oliveira, C. (2019) Phylogenomic reappraisal of the Neotropical catfish family Loricariidae (Teleostei, Siluriformes) using ultraconserved elements. Molecular Phylogenetics and Evolution, 135, 148–165. https://doi.org/10.1016/j.ympev.2019.02.017
Sabaj, M.H. (Ed.) (2019) Standard symbolic codes for institutional resource collections in herpetology and ichthyology: an online reference. Version 7.1. 21 March 2019. American Society of Herpetologists and Ichthyologists, Washington, D.C. Available from: http://www.asih.org/ (accessed 15 July 2021)
Soriano-Señorans J. (1950) Nota preliminar sobre Loricaria (Loricaria) devicenzii n.sp. de la cuenca del río Uruguay. Revista de la Facultad de Humanidades y Ciencias Montevideo, 4 (5), 265–66.