Varicharax Nigrolineatus

📖 Overview

Varicharax Nigrolineatus (Varicharax nigrolineatus), first described by Vargas & Ortega, 2020 is a tiny fish. Adults typically reach 3.60 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. It is broadly omnivorous, taking invertebrates, plant matter, and detritus.

🔬 Taxonomy

🐟 Physical Description

Dorsal soft rays (total): 8; Anal soft rays: 18 - 23; Vertebrae: 37 - 39. This species is distinguished by the following characters: horizontal process of anguloarticular broadly covered by dentary, reaching posterior border of Meckelian cartilage (161:0 > 1); maxillary teeth extending across almost entire maxillary lamella (191:0 > 1); no hemal prezygapophysis on anterior caudal vertebrae (333:0 > 1); ventral margin of post-temporal anterior to lateral margin of the epioccipital (335:1 > 0; also in data set B as 266:1 > 0); lateral lamella of pelvic bone reaching two thirds of this bone (373:0 > 1); mandibular accessory tendon longitudinally inserted on vertical through middle or anterior half of Meckelian cartilage (474:0 > 1); gill filaments not fused to form a gill gland in adult males (511:1 > 0); and from the data set B, anterior margin of nasal extending anterior to lateral process of mesethmoid (14:1 > 0); parietal branch of supratemporal canal extend over frontal or not reaching lateral surface of parietal bone (33:0 > 1); first and second postcleithra separated from each other by distance greater than three-quarters of third postcleithrum length (296:1 > 0); dorsal margin of third postcleithrum not reaching second-postcleithrum midpoint (298:1 > 0); ventralmost tendinous fiber of hypaxialis inserted on the lateral or ventral surface of caudal-fin ray 19 (367:1 > 0); no terminal lateral-line tube on caudal-fin membrane (374:1 > 0); no humeral mark (388:1 > 0); distance between bases of middle caudal-fin rays 10 and 11 approximately equal or less than that between rays 11 and 12 (433:1 > 0); anal-fin bony hooks not confined to anterior half of fin (460:1 > 0) but, instead, distributing over proximalmost segment of all or, most, fin rays (462:0 > 1; 465:0 > 1) .Cross section: compressed.

🌀 Behaviour

Behavioural data for Varicharax Nigrolineatus is currently being reviewed.

🦐 Diet

🥚 Reproduction

🌍 Habitat & Distribution

Freshwater; pelagic. Tropical South America: Peru.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

📊 Population Risk & Fisheries

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