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Hyphessobrycon anisitsi (EIGENMANN, 1907)

Buenos Aires Tetra

March 13th, 2012 — 1:21pm

Widely-distributed throughout much of the Paraná and Uruguay river systems in Brazil, Paraguay, Argentina and Uruguay.

Some records from Buenos Aires province, Argentina are now considered to refer to the congener H. togoi (Miquelarena and López, 2006) so the common vernacular name ‘Buenos Aires tetra’ may not…

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Hyphessobrycon simulatus (GÉRY, 1960)

False X-ray Tetra

March 13th, 2012 — 1:20pm

This species is uncommon in the aquarium trade although its name is sometimes applied to other species.

It was originally described in the monotypic genus Pseudopristella, and can be distinguished from the vaguely similar Pristella maxillaris by possession of a relatively large (vs. relatively small) humeral spot and having black pigmentation in the anal-fin restricted to the first ray (vs. a prominent distal blotch).

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Pristella maxillaris (ULREY, 1894)

X-ray Tetra

March 13th, 2012 — 1:20pm

P. maxillaris is one of the more popular tetras in the hobby, and is easily obtainable from most aquatic shops. It must rank among the very best choices for the newcomer to fishkeeping as it's peaceful, hardy and inexpensive. There's a selectively-bred "golden" strain available which is actually a semi-albino fish. Care is much the same as for the standard form.

Currently the only species in the genus, in older literature it's often referred to by the now invalid name…

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Paracheirodon simulans (GÉRY, 1963)

Green Neon Tetra

March 13th, 2012 — 1:20pm

For aquarists perhaps more useful are the subtle differences in colour pattern with P. simulans differing from both P. innesi and P. axelrodi in possessing a greener (vs. bluer) lateral stripe which covers more (vs. less) of the eye/head and extends to the caudal-fin base (vs. terminating anterior to caudal-fin base), a lesser (vs. greater) amount of relatively duller (vs. brighter) red pigmentation on the flanks.

The taxonomic history of all three species is complicated with earlier authors such as Géry (1960, 1977) ten…

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Nematobrycon lacortei WEITZMAN & FINK, 1971

Rainbow Tetra

March 13th, 2012 — 1:20pm

Type locality is the Río Calima in Valle del Cauca department, western Colombia.

The Calima is a major tributary within the Río San Juan system and N. lacortei is considered endemic to this drainage.

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Nematobrycon palmeri EIGENMANN, 1911

Emperor Tetra

March 13th, 2012 — 1:20pm

This species can be found in most dealers' tanks and is one of the best choices for the newcomer to fishkeeping, being attractive, hardy and inexpensive. As virtually all the fish sold in the trade have been captive bred they tend to be relatively unfussy regarding water chemistry and diet.

It's occasionally confused with N. lacortei, which is currently the only other species in the genus. They can easily be told apart by looking at the eye of the fish in question, as the male N. l…

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Hyphessobrycon roseus (GÉRY, 1960)

Yellow Phantom Tetra

March 13th, 2012 — 1:20pm

This small species is a popular aquarium fish but there is some confusion surrounding its identity. Two colour forms have been traded, one of which also possesses tiny hooks on the fin rays.

It can be distinguished from congeners by colour pattern; the body is rose-coloured, fins red with no black markings, and the ovoid humeral spot is prominent, measuring around half of the body depth.

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Hyphessobrycon sweglesi (GÉRY, 1961)

Red Phantom Tetra

March 13th, 2012 — 1:20pm

At least two colour forms have been traded, one of which is more intensely-coloured and has been referred to as H. sweglesi ‘red’ or ‘rubra’. The bright red pigmentation is retained in long-term captive specimens, suggesting that it is not considered to be an artefact of diet, but we suspect it might reflect conditions at the collection locality with the reddest fish putatively inhabiting blackwater and plainer forms clearwater environments. Zarske (2014) found the two forms to be identical in terms of morphology an…

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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 heterorhabdus (ULREY, 1894)

Flag Tetra

March 13th, 2012 — 1:20pm

Its name appears to have been misapplied to similar-looking fishes occurring throughout much of the middle and lower Amazon in Brazil and Colombia, plus the rio Orinoco drainage in Colombia and Venezuela, and coastal systems of the Guianas. Some of these have been described as distinct species (e.g. Hyphessobrycon amapaensis Zarske & Géry 1998; H. eschwartzae García-Alzate, Román-Valencia & Ortega 2013; H. montagi Lima, Couthino & Woziacki 2014), whereas the identity of others remains un…

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