Superregnum : Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Superclassis/Classis: Actinopterygii
Classis/Subclassis: Actinopteri
Subclassis/Infraclassis: Neopterygii
Infraclassis: Teleostei
Megacohors: Osteoglossocephalai
Supercohors: Clupeocephala
Cohors: Otomorpha
Subcohors: Ostariophysi
Sectio: Otophysa
Ordo: Siluriformes
Familia: Trichomycteridae
Genus: Ammoglanis
Species: A. amapaensis – A. diaphanus – A. obliquus – A. pulex
Name
Ammoglanis Costa, 1994
References
Costa, W.J.E.M. 1994. Description of two new species of the genus Moenkhausia (Characiformes: Characidae) from the central Brazil. Zoologischer Anzeiger v. 232 (no. 1–2): 21–29. Reference page.
Carl J. Ferraris, Jr., 2007, Zootaxa 1418: 1–628 [1]
Henschel, E., Bragança, P.H.N., Rangel-Pereira, F. & Costa, W.J.E.M. 2020. A new psammophilic species of the catfish genus Ammoglanis (Siluriformes, Trichomycteridae) from the Amazon River basin, northern Brazil. Zoosystematics and Evolution, 96(1): 67–72. DOI: 10.3897/zse.96.48952 Open access Reference page.
Ammoglanis is a genus of pencil catfishes native to South America.
Taxonomy
The phylogenetic position of A. pulex is problematic. It seems to be closely related to A. diaphanus due to some derived characters of the internal anatomy, but a conclusive assessment of its relationships has not been prevented by its paedomorphic features and scarcity of study material. This generic placement seems to be well supported.[1]
The relationships of the genus Ammoglanis are unknown; it is thought that this genus along with undescribed forms are the sister group to a large intrafamilial clade composed of several genera and subfamilies. In the interim, this genus is included within Sarcoglanidinae.[1]
Species
There are currently five recognized species in this genus:[2][3][4]
Ammoglanis amapaensis Mattos, Costa & Gama, 2008
Ammoglanis diaphanus Costa, 1994
Ammoglanis natgeorum Henschel, Lujan & Baskin, 2020
Ammoglanis obliquus Henschel, Bragança, Rangel-Pereira & Costa, 2020
Ammoglanis pulex de Pinna & Winemiller, 2000
Distribution
A. amapaensis originates from three different drainages of the Amazon River, the Jari, Amapari, and Araguari River.[5] A. diaphanus originates from a stream tributary to the Javaés River of the Araguaia River basin in Tocantins, Brazil.[6] A. pulex originates from the Paria Grande River, the Pamoni River, and Caño Garrapata of Venezuela.[7] A. obliquus is only known from the Rio Preta da Eva drainage basin.[4]
Description
Ammoglanis species grow to about 1.5–1.9 centimetres (0.59–0.75 inches) SL.[6][7] A. pulex is among the smallest known vertebrates.[1] A. pulex can be distinguished from A. diaphanus by a number of characteristics, including the presence of a faint pattern of eight bands formed by internal chromatophores and the lack of teeth.[1]
Ecology
A. diaphanus inhabits shallow, narrow, clear water, moderately swift-flowing stream and is found buried in the sand. It feeds on Diptera larvae and a cladocerans.[6] A. pulex is a translucent light-pink fish that camouflages well in sand.[1] A. pulex is found in sand banks near the shorelines of clear water and slightly tea-stained streams. Apparently fossorial by daylight, it is found buried in coarse clear sand at the stream edge, in areas shaded by dense tropical rainforest. The waters are with slow current, pH varying between 5.5–6.2, and temperature between 27.5–28 °C (81.5–82.4 °F).[1] A. pulex is thought to feed on microscopic fauna like protozoa, rotifers, and nematodes since it inhabits interstitial spaces among sand grains in nutrient-poor, clear-water and backwater streams.[1]
References
"A New Species of Ammoglanis (Siluriformes: Trichomycteridae) from Venezuela" (PDF). Ichthyol. Explor. Freshwaters. 11 (3): 255–264. November 2000. Archived from the original (PDF) on 2006-09-13.
Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Ammoglanis in FishBase. February 2012 version.
Henschel, Elisabeth; Lujan, Nathan K.; Baskin, Jonathan N. (November 2020). "Ammoglanis natgeorum, a new miniature pencil catfish (Siluriformes: Trichomycteridae) from the lower Atabapo River, Amazonas, Venezuela". Journal of Fish Biology. 97 (5): 1481–1490. doi:10.1111/jfb.14515. ISSN 0022-1112. PMID 32920863.
Henschel, Elisabeth; Bragança, Pedro H. N.; Rangel-Pereira, Filipe; Costa, Wilson J. E. M. (2020-02-18). "A new psammophilic species of the catfish genus Ammoglanis (Siluriformes, Trichomycteridae) from the Amazon River basin, northern Brazil". Zoosystematics and Evolution. 96 (1): 67–72. doi:10.3897/zse.96.48952. ISSN 1860-0743.
Mattos, José L. O.; Costa, Wilson J. E. M.; Gama, Cecile de S. (2008). "A new miniature species of Ammoglanis (Siluriformes: Trichomycteridae) from the Brazilian Amazon". Ichthyol. Explor. Freshwaters. 19 (2): 161–166.
Froese, Rainer; Pauly, Daniel (eds.) (2007). "Ammoglanis diaphanus" in FishBase. July 2007 version.
Froese, Rainer; Pauly, Daniel (eds.) (2007). "Ammoglanis pulex" in FishBase. July 2007 version.
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