Vandellia

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Vandellia
Candiru.png
Vandellia cirrhosa
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Siluriformes
Family: Trichomycteridae
Subfamily: Vandelliinae
Genus: Vandellia
Valenciennes, 1846
Type species
Vandellia cirrhosa
Valenciennes, 1846
Synonyms

Urinophilus
Eigenmann, 1918

Vandellia is a genus of catfishes native to South America. The species in this genus are the most well-known of the parasitic catfishes also known as candiru, known for their alleged habit of entering the human urethra. [1]

Contents

Species

There are currently three recognized species in this genus: [2]

Distribution

V. beccarii originates from the Orinoco River basin and rivers of The Guianas. V. cirrhosa is distributed in the Amazon Basin. V. sanguinea inhabits the Amazon, Orinoco, and Essequibo River basins. [3]

Description

V. beccarii can be distinguished from other vandelliines by its square or slightly emarginate caudal fin and the colour pattern of two dark bands extending from the dorsal fin and the anal fin and converging onto the caudal fin. [4] V. sanguinea may grow to 5.3  centimetres (2.1  in) SL. [5] V. cirrhosa grows up to 17.0 cm (6.7 in) SL. [6]

Ecology

These species are hematophagous (blood-consuming) parasites, like all other members of the subfamily Vandelliinae. [4] V. cirrhosa uses visual and chemo-sensory orientation to find potential hosts. It is active both during the daytime and nighttime while foraging. V. cirrhosa enters the gill chambers of larger fish to suck blood. It bites mostly at the ventral or dorsal aorta arteries, and the blood is pumped into its gut by the host's blood pressure; it does not need any special sucking or pumping mechanism to quickly engorge itself with blood, but simply uses its needle-like teeth to make an incision in an artery. [6] V. cirrhosa is able to engorge itself enormously; the ingested blood is visible through the swollen belly. Some kind of valve or sphincter is likely present to prevent reflux of ingested blood. The time required to engorge itself with blood and leave the host's gill chamber ranges from 30–145  seconds. Some host fish species ( Colossoma macropomum ) are able to hamper the attacks of V. cirrhosa by pressing the fish under the bony gill-cover flap, or by using its pectoral fin to press it against the flank or to sweep it from the gill-cover edge. [6] V. cirrhosa is reputed to be able to enter the urethra of humans urinating under water; presumably it mistakes the urea for water exhausted from gills, however this has never been clinically proven. [6]

When inactive, V. cirrhosa burrows in sandy or soft, muddy bottoms. [6] V. beccarii has been captured free-swimming. [4]

Related Research Articles

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<span class="mw-page-title-main">Amblycipitidae</span> Family of fishes

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<span class="mw-page-title-main">Trichomycteridae</span> Family of fishes

Trichomycteridae is a family of catfishes commonly known as pencil catfishes or parasitic catfishes. This family includes the candiru fish, feared by some people for its alleged habit of entering into the urethra of humans. They are one of the few parasitic chordates. Another species is the life monsefuano which was important to the Moche culture and still an important part of Peruvian cuisine.

<span class="mw-page-title-main">Aspredinidae</span> Family of fishes

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<i>Malapterurus</i> Genus of fishes

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<i>Sorubim</i> Genus of fishes

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<i>Brachyplatystoma</i> Genus of fishes

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<i>Leiarius</i> Genus of fishes

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Paracanthopoma parva is a species of catfishes of the family Trichomycteridae. P. parva grows to about 2.7 centimetres (1.1 in) SL and is endemic to Brazil where it occurs in the Amazon and Essequibo River basins.

Tridensimilis is a genus of pencil catfishes native to South America.

Stegophilus is a genus of pencil catfishes native to South America.

The Vandelliinae are a subfamily of catfishes of the family Trichomycteridae. Vandelliines are hematophagous, feeding on the blood of larger fish. Members of this subfamily may be known as candirú, notorious for occasionally entering human bodily orifices, particularly the urethra; no evidence indicates such attacks are anything more than rare and accidental perversions of the usual feeding behaviour of the parasite — it seems unlikely that it would survive in the human body for long, so such an entry should be disastrous for both parties. In the usual course of events, parasitic vandelliines enter the body cavities of host fishes, feed on blood from gill filaments, and leave again.

<i>Cetopsis</i> Genus of fishes

Cetopsis is a genus of catfishes of the family Cetopsidae.

<i>Entomocorus</i> Genus of fishes

Entomocorus is a genus of catfishes of the family Auchenipteridae.

<i>Cetopsis candiru</i> Species of fish

Cetopsis candiru, also known as candiru, candiru açú, candiru cobra or canero, is a carnivorous species of whale catfish found in the Amazon basin of Peru, Brazil and Bolivia. Similar to Cetopsis coecutiens, Cetopsis candiru is a large species of the genus Cetopsis and a widespread scavenger, known for its voracious feeding and the habit of burrowing into the carcasses of dead animals and humans. Despite its name, it is not closely related to the bloodsucking Candiru.

Brachyplatystoma filamentosum, commonly called piraíba, kumakuma, or lau lau, is a species of large catfish of the family Pimelodidae and genus Brachyplatystoma that is native to Amazon and Orinoco River basins and rivers in Guianas and northeastern Brazil.

The Highwaterman catfish, is a species of pelagic potamodromous catfish of the family Pimelodidae that is native to Guyana, Suriname, Venezuela, northern Brazil and Gulf of Paria.

Hypophthalmus marginatus, commonly called the Mapará, is a species of demersal potamodromous catfish of the family Pimelodidae that is native to Amazon and Orinoco River basins of Brazil, Peru and major rivers of French Guiana and Suriname.

References

  1. Nelson, Joseph S. (2006). Fishes of the World . John Wiley & Sons, Inc. ISBN   0-471-25031-7. OCLC   224053746.
  2. Froese, Rainer and Pauly, Daniel, eds. (2012). Species of Vandellia in FishBase . February 2012 version.
  3. Ferraris, Carl J. Jr. (2007). "Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types" (PDF). Zootaxa . 1418: 1–628. Retrieved 2009-06-23.
  4. 1 2 3 Schmidt, Robert E. (1987). "Redescription of Vandellia beccarii (Siluriformes: Trichomycteridae) from Guyana". Copeia . 1987 (1): 234–237. doi:10.2307/1446064. JSTOR   1446064.
  5. Froese, Rainer; Pauly, Daniel (eds.) (2007). "Vandellia sanguinea" in FishBase . July 2007 version.
  6. 1 2 3 4 5 Froese, Rainer; Pauly, Daniel (eds.) (2007). "Vandellia cirrhosa" in FishBase . July 2007 version.