''Mimagoniates'' is a

genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...

of characid

fish A fish (: fish or fishes) is an aquatic animal, aquatic, Anamniotes, anamniotic, gill-bearing vertebrate animal with swimming fish fin, fins and craniate, a hard skull, but lacking limb (anatomy), limbs with digit (anatomy), digits. Fish can ...

from rivers and streams in southeastern, southern and central-western Brazil, northeastern Argentina, and

Paraguay Paraguay, officially the Republic of Paraguay, is a landlocked country in South America. It is bordered by Argentina to the Argentina–Paraguay border, south and southwest, Brazil to the Brazil–Paraguay border, east and northeast, and Boli ...

.Thomaz, A.T., Arcila, D., Ortí, G. & Malabarba, L.R. (2015): Molecular phylogeny of the subfamily Stevardiinae Gill, 1858 (Characiformes: Characidae): classification and the evolution of reproductive traits. ''BMC Evolutionary Biology, (2015) 15: 146.'' The individual species generally have relatively small ranges and two, ''M. lateralis'' and ''M. sylvicola'', are considered

threatened A threatened species is any species (including animals, plants and fungi) which is vulnerable to extinction in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensatio ...

by Brazil's Ministry of the Environment.

ICMBio The Chico Mendes Institute for Biodiversity Conservation ( Portuguese: ''Instituto Chico Mendes de Conservação da Biodiversidade'', ICMBio) is a government agency under the administration of the Brazilian Ministry of the Environment. It is nam ...

(Ministry of the Environment, Brazil)
Portaria MMA nº 445, de 17 de dezembro de 2014
Lista de Especies Ameaçadas - Saiba Mais. Retrieved 1 December 2018. Commonly known as croaking tetra or chirping tetra because they can produce sounds, some of these fish were historically included in ''

Glandulocauda ''Glandulocauda'' is a genus of small characin freshwater fish that are endemic to Brazil, where restricted to the upper Paraná basin and coastal river basins in São Paulo state.Thomaz, A.T., Arcila, D., Ortí, G. & Malabarba, L.R. (2015): Mo ...

'' and together with ''

Lophiobrycon ''Lophiobrycon weitzmani'' is a species of small characin endemic to Brazil, where it is found in the upper Paraná River basin. It is considered threatened by Brazil's Ministry of the Environment. This species is the only member of the genus '' ...

'' they form the

tribe The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide use of the term in English is in the discipline of anthropology. The definition is contested, in part due to conflict ...

Glandulocaudini. ''Mimagoniates'' have a supplementary

breathing organ The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies grea ...

located above the

gill A gill () is a respiration organ, respiratory organ that many aquatic ecosystem, aquatic organisms use to extract dissolved oxygen from water and to excrete carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow r ...

s which makes a faint chirping sound when these fish come to the surface to gulp

air An atmosphere () is a layer of gases that envelop an astronomical object, held in place by the gravity of the object. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low. A stellar atmosph ...

. It also plays a role in

courtship Courtship is the period wherein some couples get to know each other prior to a possible marriage or committed romantic, ''de facto'' relationship. Courtship traditionally may begin after a betrothal and may conclude with the celebration of marri ...

as the male chases and hovers near the female while taking gulps of air and expelling it to make a rhythmic noise.Axelrod, Herbert Richard (1996): ''Exotic Tropical Fishes''. T.F.H. Publications. Croaking behavior may have evolved from a behavior called "surface nipping", which occurs when the fish is searching for food. This gulping of air has no useful

respiratory The respiratory system (also respiratory apparatus, ventilatory system) is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies gr ...

function.Nelson, Keith (1964): The Evolution of a Pattern of Sound Production Associated with Courtship in the Characid Fish, ''Glandulocauda inequalis''. ''

Evolution Evolution is the change in the heritable Phenotypic trait, characteristics of biological populations over successive generations. It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, re ...

'' 18(4): 526–540. They are small fish, up to in

standard length Fish measurement is the measuring of individual fish and various parts of fish anatomy, their anatomies, for data used in many areas of ichthyology, including Taxonomy (biology), taxonomy and fishery biology. Overall length Standard length (SL) is ...

depending on the exact species.

Species

There are currently 7 recognized species in this genus: * '' Mimagoniates barberi'' Regan, 1907 * '' Mimagoniates inequalis'' ( C. H. Eigenmann, 1911) (Croaking tetra) * '' Mimagoniates lateralis'' ( Nichols, 1913) * '' Mimagoniates microlepis'' (

Steindachner Franz Steindachner (11 November 1834 in Vienna – 10 December 1919 in Vienna) was an Austrian zoologist, ichthyologist, and herpetologist. He published over 200 papers on fishes and over 50 papers on reptiles and amphibians. Steindachner descri ...

, 1877) (Blue tetra) * '' Mimagoniates pulcher'' Menezes & S. H. Weitzman, 2009 * '' Mimagoniates rheocharis'' Menezes & S. H. Weitzman, 1990 * ''

Mimagoniates sylvicola ''Mimagoniates'' is a genus of characid fish from rivers and streams in southeastern, southern and central-western Brazil, northeastern Argentina, and Paraguay.Thomaz, A.T., Arcila, D., Ortí, G. & Malabarba, L.R. (2015): Molecular phylogeny ...

'' Menezes & S. H. Weitzman, 1990

References

{{Taxonbar, from=Q6416801 Glandulocaudini Taxa named by Charles Tate Regan