Eigenmannia Sirius

📖 Overview

The type-locality where the specimens were collected from a clearwater river up to c. 3-6 m wide and 0.5-2.5 m deep, with preserved riparian vegetation, swift current, and sand, pebbles and dead leaves on the bottom. Several types of microenvironment were sampled exhaustively, but this species was captured only between root and subaquatic vegetation. Associated species sampled syntopically were Aequidens cf. rondoni, Erythrinus erythrinus, Hemigrammus skolioplatus, Hyphessobrycon hexastichos, H. melanostichos, Hasemania nambiquara, Hoplerythrinus unitaeniatus; and no other Gymnotiformes were collected with this species .

🔬 Taxonomy

🐟 Physical Description

This species is distinguished by the following characters: presence of superior midlateral stripe; mouth subterminal; depth of posterodorsal expansion on infraorbitals 1+2 corresponding to 70% length of infraorbitals 1+2; precaudal vertebrae 15; origin of the superior midlateral stripe at vertical between base of 23rd to 31st anal-fin ray; mouth width, 13.1-22.4% HL; premaxillary teeth, 15-24; dentary teeth, 15-33; scale rows above lateral line 9-12; coronomeckelian bone corresponding to 20–25% of length of Meckel’s cartilage; eye completely covered by thin membrane; snout rounded; absence of alternating dark bands on flanks; region above the lateral line on the anterior portion of the body covered by scales .: elongated; Cross section: compressed.

🌀 Behaviour

Behavioural data for Eigenmannia Sirius is currently being reviewed.

🦐 Diet

🥚 Reproduction

🌍 Habitat & Distribution

Freshwater; benthopelagic; depth range 0 - 2 m . Tropical South America: Brazil.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

📊 Population Risk & Fisheries

🐠 Related Species

🔍 Similar Species

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