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Nannostomus rubrocaudatus ZARSKE, 2009

Purple Pencilfish

October 29th, 2012 — 4:48pm

In live fish colour pattern is perhaps the most useful way to identify N. rubrocaudatus plus the closely-related N. marginatus and N. mortenthaleri. N. marginatus is immediately distinguished from the other two by the fact it lacks red pigmentation on the body in males, but N. mortenthaleri and N. rubrocaudatus are more easily-confused.

Males of N. rubrocaudatus can be told apart fro…

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Apistogramma baenschi RÖMER, HAHN, RÖMER, SOARES & WÖHLER, 2004


March 25th, 2012 — 6:52pm

This species is assigned the code A188 under the DATZ system and is also known by the trade names A. sp. ‘Inca/Inka’, A. sp. ‘Inka 50’, A. sp. ‘highfin nijsseni’, A. sp. ‘Nijsseni 2’, A. sp. ‘red crescent’ or A. baenschi ‘Inca’.

It’s among those members of the genus produced on a commercial basis and is regularly available in the aquarium trade.

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Otocinclus cocama REIS, 2004

Zebra Oto

March 13th, 2012 — 1:24pm

This stunning miniature Loricariid has only been available in the hobby since 2001, and was described to science in 2004. As with other otos, it can be a little delicate when first imported and should be quarantined carefully until it's settled.

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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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Carnegiella strigata (GÜNTHER, 1864)

Marbled Hatchetfish

March 13th, 2012 — 1:23pm

C. strigata is an enduringly popular species in the aquarium hobby but is not bred on a commercial basis with all fish offered for sale collected in the wild.

It can be told apart from other members of the genus by its larger adult size and dark, marbled colour pattern appearing as a series of dark and light stripes running diagonally across the body below the lateral line.

This colour pattern is variable and popul…

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Hyphessobrycon peruvianus LADIGES, 1938

Peruvian Tetra

March 13th, 2012 — 1:23pm

This species is available on a relatively regular basis, although it’s sometimes confused with the similar-looking congeners H. loretoensis and H. metae.

It can be identified via the following combination of characters as per Géry (1977): elongate in shape with body depth fitting 3.8-3.9 times in its standard length; caudal peduncle narrow, its depth fitting 1.8 times in its length; head short, interorbital broad, snout short and rounded; dorsal-fin insertion an…

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Corydoras pastazensis WEITZMAN, 1963

Pastaza Cory

March 13th, 2012 — 1:23pm

The form from the Río Tigre, previously referred to as the subspecies C. p. orcesi (Weitzman & Nijssen, 1970) was raised to full species status as C. orcesi by Isbrücker (2001), but this decision does not appear to have been followed by all authorities some of which consider C. p. orcesi a synonym of C. pastazensis.

The two species are relatively easy to tell apart by colour pattern; in C. pastazensis the dark vertical…

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Corydoras copei NIJSSEN & ISBRÜCKER, 1986

March 13th, 2012 — 1:23pm

This species is not well known and rarely traded for the aquarium hobby.

Unfortunately diagnostic characters cannot be provided since we’ve been unable to obtain the type description, and little has been written about this species since it was published. It looks very similar to several congeners, particularly C. acrensis and C. cruziensis.

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Corydoras armatus (GÜNTHER, 1868)

March 13th, 2012 — 1:22pm

Fish collected in the upper rio Maderia basin in Brazil and Bolivia have been traded under the invented names C. sp. ‘dorsalis’ and C. sp. ‘ogawae’ in the past, although are officially-considered conspecific with C. armatus.

This appears to warrant investigation since the Río Huallaga in Peru, type locality of C. armatus, and collection localities in the upper Madeira are separated by a straight-line distance of almost 2500 km.

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Colomesus asellus (MÜLLER & TROSCHEL, 1849)

Amazon Puffer

March 13th, 2012 — 1:22pm

This species is also referred to as ‘South American puffer’, ‘SAP’, ‘Amazonian puffer’, ‘Peruvian puffer’, or ‘Brazilian puffer’ in the ornamental trade.

Within the genus Colomesus, C. asellus can be immediately identified by possessing a unique transverse row of dermal flaps across the chin which is absent in its congeners C. psittacus and C. tocantinensis.

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