Tympanopleura Cryptica

📖 Overview

Tympanopleura Cryptica (Tympanopleura cryptica), first described by Daniel, 2015 is a small fish in the family Auchenipteridae (order Siluriformes). Adults typically reach 8.50 cm in maximum length. It inhabits freshwater systems including rivers, streams, and lakes. It occurs in Tropical waters. It feeds on a mix of small fish and invertebrates as a mid-level predator.

🔬 Taxonomy

🐟 Physical Description

Dorsal spines (total): 2; Dorsal soft rays (total): 6; Anal soft rays: 23 - 30; Vertebrae: 38 - 41. Tympanopleura cryptica is distinct from its congeners by having a unique combination of characters. It is distinguished from T. atronasus in having gill rakers on the first arch 21-26, mode 22 (vs. 14-23, mode 16 ), preanal vertebrae 14-15 (vs. 16-19); total vertebrae 38-41, mode 38 (vs. 39-43, mode 41); pleural rib pairs 4-5 (vs. 7-8), distance between pectoral- and dorsal-fin origin 21.6-24.3% SL (vs. 15.7-20.9% SL), and a uniform body coloration that does not include a dark blotch of melanophores on the flank above the anal-fin base or streaks in the caudal fin, as is typically present in T. atronasus. It can be diagnosed from T. brevis in having anal-fin rays 23-30 (vs. 31-36), pectoral-fin rays 8-10, mode 9 (vs. 10-12, mode 11), and total vertebrae 38 (vs. 38-41, mode 40). It differs from T. longipinna in having anal-fin rays 23-30 (vs. 32-42), pectoral-fin rays 8-10, mode 9 (vs. 10-13, mode 11), preanal vertebrae 14-15, mode 15 (vs. 13-15, mode 14), total vertebrae 38-41, mode 38 (vs. 40-43, mode 43), preanal length 59.6-66.0% SL (vs. 49.7-57.6% SL), distance between dorsal and adipose-fin origin 33.9-46.7% SL (vs. 46.5-54.0% SL), anal-fin base length 24.4-30.3% SL (vs. 33.9-39.9% SL), and eye diameter 16.7-25.6% HL (vs. 11.6-18.5% HL). It is distinguished from T. piperata in having anal-fin rays 23-30 (vs. 31-38), gill rakers on the first arch 21-26, mode 22 (vs. 16- 23, mode 19), total vertebrae 38-41, mode 38 (vs 39-41, mode 40), prepelvic length 48.4-53.6% SL (vs. 41.3-47.0% SL), prepectoral length 29.7-33.8% SL (vs. 23.6-28.3% SL), distance between pectoral and dorsal-fin origin 21.6-24.3% SL (vs. 15.2-20.9% SL), distance between dorsal-and adipose-fin origin 33.9-46.7% SL (vs. 45.9-55.4% SL), anal-fin base length 24.4-30.3% SL (vs. 30.9-39.3% SL), eye diameter 16.7-25.6% HL (vs. 24.3-35.7% HL), presence of two small posterior diverticula on gas bladder (vs. diverticula absent), and base of the caudal fin without a characteristic dark, hourglass-shaped transverse bar usually present in T. piperata. It differs from T. rondoni in having anal-fin rays 23-30, mode 29 (vs. 28-37, mode 31), pectoral-fin rays 8-10, mode 9 (vs. 10-13, mode 11), gill rakers on the first arch 21-26, mode 22 (vs. 24-33, mode 29-30), total vertebrae 38-41, mode 38 (vs. 38-42, mode 40), pleural rib pairs 4-5, mode 5 (vs. 4-6, mode 6), eye diameter 16.7-25.6% HL (vs. 8.4-17.0% HL), gas bladder cordiform and with two short posterior diverticula (vs. gas bladder elongated antero-posteriorly and with two longer, recurved diverticula), and pigmentation on the head and body diffuse and relatively uniform in appearance (vs. prominent spotted pattern) .

🌀 Behaviour

Behavioural data for Tympanopleura Cryptica is currently being reviewed.

🦐 Diet

🥚 Reproduction

🌍 Habitat & Distribution

Freshwater; benthopelagic. Tropical South America: middle and upper Amazon River basin, State of Amazonas in Brazil and Loreto Region in Peru.

🌿 Ecology

📐 Morphometrics

🌡️ Water Parameters & Tolerance

📊 Population Risk & Fisheries

🐠 Related Species

🔍 Similar Species

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