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Thoracocharax stellatus (KNER, 1858)

Spotfin Hatchetfish

March 13th, 2012 — 1:23pm

T. stellatus is superficially similar to its only congener T. securis, but can immediately be identified by the presence (vs. absence) of a prominent dark spot in the dorsal-fin. It is sometimes traded as ‘platinum hatchetfish’.

The genus Thoracocharax was originally erected by Fowler in 1906 as a subgenus of Gasteropelecus, but was elevated to generic status by Weitzman (1960).

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Rhaphiodon vulpinus SPIX & AGASSIZ, 1829


March 13th, 2012 — 1:23pm

R. vulpinus is the most widely-distributed member of the family Cynodontidae.

Type locality is given simply as ‘Brazilian rivers’, but this species is currently understood to be distributed in the Amazon basin from the Río Ucayali system in Peru, eastward as far as the rio Xingu in Brazil, plus the rio Tocantins and Rio Capim basins.

It’s also known from the Río Orinoco ba…

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Apistogramma trifasciata (EIGENMANN & KENNEDY, 1903)

Three-striped Apisto, A204

March 13th, 2012 — 1:22pm

This species is assigned the ‘A’ number A204 under the DATZ system with possibly conspecific, related forms coded A205 or A206 depending on collection locality and representing populations from Argentina and the rio Guaporé, respectively.

The genus Apistogramma is among the most speciose of South American cichlid genera with around 70 species valid at present but many more awaiting description.

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Aphyocharax nattereri (STEINDACHNER, 1882)

Dawn Tetra

March 13th, 2012 — 1:21pm

This species is normally referred to as A. paraguayensis, but that name has been considered a synonym of A. nattereri since 2003.

Confusion remains however, as the type locality for the latter is ‘Villa Bella’, now known as Parintins, a settlement on the main Amazon river channel between Manaus and Santarém and many kilometres away from the majority of confirmed localities.

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Aphyocharax rathbuni EIGENMANN, 1907

Redflank Bloodfin

March 13th, 2012 — 1:21pm

Endemic to the Paraguay, Paraná and Uruguay river drainages in Brazil, Paraguay, Argentina and Uruguay.

The smallest of the three Aphyocharax species seen in the hobby, the redflank is relatively uncommon in the hobby in the aquarium trade.

It is also known as the Green Fire Tetra.

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Hyphessobrycon megalopterus (EIGENMANN, 1915)

Black Phantom Tetra

March 13th, 2012 — 1:20pm

The majority of records pertain to the rio Guaporé (Río Iténez in Bolivia), the main affluent of the rio Mamoré, which drains the vast tropical wetland known as the Pantanal, and the upper rio Paraguai, which also has its headwaters in the Pantanal but flows in the opposite direction. The Guaporé and Paraguai are connected due to rising water levels during the annual wet season.

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Hyphessobrycon herbertaxelrodi GÉRY, 1961

Black Neon Tetra

March 13th, 2012 — 1:20pm

This species has been a ubiquitous aquarium fish since its discovery, and is produced on a commercial basis in several countries, therefore wild fish are no longer collected. An ornamental albino form is sometimes available.

Apart from its distinctive colour pattern, it can be identified from related species via the following combination of charac…

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Hyphessobrycon eques (STEINDACHNER, 1882)

Serpae Tetra

March 13th, 2012 — 1:20pm

This species is very common in the aquarium trade and is also referred to as ‘jewel’, ‘red minor’, ‘blood’, or ‘callistus’ tetra.

A number of selectively-bred ornamental strains have been developed, including ‘metallic’, ‘long-finned’, ‘balloon’ and ‘fairy-fin’.

Characiformes is among the most diverse orders of freshwa…

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Corydoras hastatus EIGENMANN & EIGENMANN, 1888

Tail-spot Pygmy Cory

March 13th, 2012 — 1:19pm

It exhibits slightly different behaviour to the majority of congeners in that it tends to swim in midwater and spends a large proportion of its time away from the substrate. Its morphology exhibits corresponding adaptations towards a pelagic existence with a relatively large eye, a more terminal mouth position, more strongly-forked caudal-fin, and more symmetrical body shape than most other Corydoras species.

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Corydoras aeneus (GILL, 1858)

Bronze Cory

March 13th, 2012 — 1:19pm

Despite the ubiquity of its name in aquarium literature, confusion surrounds its true identity. Given it’s the only member of the genus occurring on the island, fish from Trinidad do presumably represent C. aeneus (see our image), but the classification of those from other localities appears far from certain.

Today the species is accepted to occur throughout much of South America, and indeed similarly-patterned fish do occur across a large portion of the continent. Some of these, such as the gree…

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