Overview

Comprehensive Description

Biology

Found in muddy and sandy bottom and water depth nearly 1 m (Ref. 75063).
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Distribution

Orinoco River basin: Colombia and Venezuela.
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South America: Rio Orinoco basin.
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Physical Description

Morphology

Dorsal soft rays (total): 11
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Size

Max. size

3.6 cm SL (male/unsexed; (Ref. 75063)); 4.16 cm SL (female)
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Diagnostic Description

Distinguished readily from all congeners including the sympatric Odontostilbe pulchra and Odontostilbe pao by its anterior position of the adipose fin, at vertical through last 2nd or 3rd anal-fin ray insertions. Can be further differentiated from Odontostilbe pulchra by a group of morphometric characters in males: snout pointed and longer 24.1-26.9% HL (vs. short and blunt in Odontostilbe pulchra, 18.0-26.0% HL); shorter pectoral-fin length 20.9-23.5% SL (vs. 21.3-26.4% SL); smaller anal-fin base 24.9-26.8% SL (vs. 26.0-31.4% SL); shorter caudal peduncle length 11.5- 13.0% SL (vs. 12.5-16.0% SL) ; longer snout-pelvic fin origin distance 45.1-48.7% SL (vs. 42.3-47.9% SL); and longer snout-anal fin origin distance 63.7-68.6% SL (vs. 58.6-64.0% SL). Furthermore, mature males have hooks on 1st to 6th-7th anal-fin rays (vs. hooks on 1st to 22nd anal-fin branched rays in Odontostilbe pulchra). Mature males usually have the 2nd unbranched dorsal-fin ray elongate, not present in Odontostilbe pulchra. Females and immature specimens, and not well-developed males can be differentiated from Odontostilbe pulchra by the following features: maxillary teeth 3-4, mostly 3 (vs. 2-3, mostly 2 in Odontostilbe pulchra; lateral line with 36 scales, one specimen 35 (vs. 33-37, mostly 34-35). Differs also from Odontostilbe fugitiva by its gill rakers counts on lower branch, averaging 11 (vs. usually 12) (Ref. 75063).Description: Dorsal fin ii9; Anal fin iv or v, 19, 20, 21 or 22; Pectoral fin i9, 10, 110 or 12; Pelvic fin i6 or 7. Precaudal vertebrae, including Weberian apparatus 16 or 17 (Ref. 75063).
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Ecology

Habitat

Environment

benthopelagic; freshwater; depth range 1 - ? m (Ref. 75063)
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Conservation

Threats

Not Evaluated
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