Lepidosiren paradoxa (*)
Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Classis: Dipnoi
Ordo: Lepidosireniformes
Familia: Lepidosirenidae
Genus: Lepidosiren
Species: Lepidosiren paradoxa
Name
Lepidosiren paradoxa Fitzinger, 1837
Vernacular names
dansk: Sydamerikansk lungefisk
English: South American lungfish
français: Dipneuste sud-américain
日本語: レピドシレン・パラドクサ
polski: Prapłaziec
русский: Чешуйчатник американский / Лепидосирен
ไทย: ปลาปอดอเมริกาใต้
中文: 美洲肺魚
The South American lungfish (Lepidosiren paradoxa) is the single species of lungfish found in swamps and slow-moving waters of the Amazon, Paraguay, and lower Paraná River basins in South America.[5] Notable as an obligate air-breather, it is the sole member of its family Lepidosirenidae. Relatively little is known about the South American lungfish. Additional common names include American mud-fish[6] and scaly salamanderfish.[7] The South American Lungfish have adapted to cope with both droughts and floods.[8] This is normal due to the South American Lungfish adapting pulmonary mechanoreceptors.[9] In Brazil, it is known by the indigenous language Tupi name piramboia, which means "snake-fish" (Portuguese pronunciation: [piɾɐ̃ˈbɔj.jɐ]), and synonyms pirarucu-bóia ([piɾɐɾuˈku ˈbɔj.jɐ]), traíra-bóia ([tɾɐˈiɾɐ ˈbɔj.jɐ]), and caramuru ([kɐɾɐmuˈɾu]).
The immature lungfish is spotted with gold on a black background; in the adult, this fades to a brown or gray color.[10] Its tooth-bearing premaxillary and maxillary bones are fused as in all Dipnoi. South American lungfish also share an autostylic jaw suspension (where the palatoquadrate is fused to the cranium) and powerful adductor jaw muscles with the other extant Dipnoi. Like the African lungfishes, this species has an elongated, almost eel-like body. It may reach a length of 125 cm (4.10 ft).[5] The pectoral fins are thin and thread-like, while the pelvic fins are somewhat larger, and set far back. The fins are connected to the shoulder by a single bone, which is a marked difference from most fish, whose fins usually have at least four bones at their base, and a marked similarity with nearly all land-dwelling vertebrates.[11] The gills are greatly reduced and essentially non-functional in the adults.[12]
Lepidosiren paradoxa 0.jpg
Female above, male below
Juvenile lungfish feed on insect larvae and snails, while adults are omnivorous, adding algae and shrimp to their diets, crushing them with their heavily mineralized tooth-plates. The fish's usual habitats disappear during the dry season, so they burrow into the mud and make a chamber about 30–50 cm (12–20 in) down, leaving a few holes to the surface for air.[12] During this aestivation, they produce a layer of mucus to seal in moisture, and slow their metabolism down greatly.[10]
When the rainy season begins, they come out and begin to mate. The parents build a nest for the young, which resemble tadpoles and have four external gills. To enrich the oxygen in the nest, the male develops highly vascularized structures on his pelvic fins that release additional oxygen into the water.[12] The young become air-breathing at about seven weeks. Juveniles have external threadlike gills very much like those of newts.[10] Fossils of the modern species have been found between 72 and 66 mya during the Maastrichtian stage of the late Cretaceous just before the KPG extinction that killed off the non-avian dinosaurs.[13]
References
"Lepidosiren paradoxa Fitzinger 1837 (South American lungfish)". PBDB.
"Part 7- Vertebrates". Collection of genus-group names in a systematic arrangement. Retrieved 30 June 2016.
Haaramo, Mikko (2007). "Ceratodiformes – recent lungfishes". Mikko's Phylogeny Archive. Retrieved 3 July 2016.
Froese, R.; Pauly, D. (2017). "Lepidosirenidae". FishBase version (02/2017). Retrieved 18 May 2017.
Froese, Rainer; Pauly, Daniel (eds.) (2014). "Lepidosiren paradoxa" in FishBase. April 2014 version.
Ernst Heinrich Philipp August Haeckel; Edwin Ray Lankester; L. Dora Schmitz (1892). The History of Creation, Or, The Development of the Earth and Its Inhabitants by the Action of Natural Causes: A Popular Exposition of the Doctrine of Evolution in General, and of that of Darwin, Goethe, and Lamarck in Particular : from the 8. German Ed. of Ernst Haeckel. D. Appleton. p. 422. page 289
Konrad Guenther; Bernard Miall (1931). A Naturalist in Brazil: The Record of a Year's Observation of Her Flora, Her Fauna, and Her People. Houghton Mifflin Company. pp. 399. page 275
MESQUITA-SAAD, L. S. B.; LEITÃO, M. A. B.; PAULA-SILVA, M. N.; CHIPPARI-GOMES, A. R.; ALMEIDA-VAL, V. M. F. (August 2002). "Specialized metabolism and biochemical suppression during aestivation of the extant South American lungfish --Lepidosiren paradoxa". Brazilian Journal of Biology. 62 (3): 495–501. doi:10.1590/s1519-69842002000300014. ISSN 1519-6984. PMID 12530187.
de Moraes, Marcos F. P. G.; Höller, Sabine; da Costa, Oscar T. F.; Glass, Mogens L.; Fernandes, Marisa N.; Perry, Steven F. (July 2005). "Morphometric Comparison of the Respiratory Organs in the South American Lungfish Lepidosiren paradoxa (Dipnoi)". Physiological and Biochemical Zoology. 78 (4): 546–559. doi:10.1086/430686. ISSN 1522-2152. PMID 15957109. S2CID 10408527.
Animal-world: South American Lungfish.
"Your Inner Fish" Neil Shubin, 2008,2009,Vintage, p.33
Bruton, Michael N. (1998). Paxton, J.R.; Eschmeyer, W.N. (eds.). Encyclopedia of Fishes. San Diego: Academic Press. p. 70. ISBN 0-12-547665-5.
"Lepidosiren Fitzinger 1837 (South American lungfish)". PBDB.
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