How to Identify Tete

To identify Tete (Phreatobius cisternarum), look at these key features.

Physical Characteristics

Body shape

eel-like

Coloration

Typically depigmented, appearing translucent pinkish or reddish due to visible blood vessels. Some individuals may exhibit a faint yellowish or whitish hue.

Scale type

none

Mouth position

terminal

Distinctive features

Greatly reduced or vestigial eyes, often covered by skin., Elongated, slender, and cylindrical body, resembling a worm or small eel., Absence of scales., Presence of well-developed barbels around the mouth for sensory perception., Small, almost translucent fins.

Dorsal fin

A single, small, adipose fin is present, often difficult to discern. No true dorsal fin with rays.

Tail fin

Small, rounded to truncate caudal fin, often continuous with the anal fin in some descriptions, though typically distinct.

Pectoral fin

Small, paddle-like pectoral fins, positioned ventrally.

Distinctive fins

Pelvic fins are absent. The anal fin is long and confluent with the caudal fin in some species of Phreatobius, but in P. cisternarum, it is distinct but small.

Identification Tips

1. 1

   Body Shape and Coloration

   Look for a small, slender, eel-like fish, typically translucent pinkish or reddish, lacking any significant pigmentation. This immediately distinguishes it from most surface-dwelling fish.

2. 2

   Eyes

   Observe the eyes; they are either completely absent, vestigial, or greatly reduced and often covered by skin, indicating adaptation to a lightless environment.

3. 3

   Fins

   Note the absence of pelvic fins and the presence of only small, often translucent pectoral, anal, and caudal fins. A small adipose fin may be present.

4. 4

   Barbels

   Examine the head for well-developed sensory barbels around the mouth, crucial for navigation and feeding in darkness.

5. 5

   Habitat

   Its discovery in subterranean waters (wells, boreholes, caves) is a primary identifier, as it is not found in surface rivers or streams.

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