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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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Colomesus asellus (M√úLLER & 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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Satanoperca jurupari (HECKEL, 1840)

Demon Eartheater

March 13th, 2012 — 1:19pm

S. jurupari is also known as ‘demon fish’, ‘jurupari earth eater’, ‘green horse face’, or simply ‘jurupari’ in the aquarium hobby.

It can be distinguished from other members of the genus by the following combination of characters: presence of a relatively small dark ocellus on the upper caudal-fin base; absence of well-defined dark blot…

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