How to Identify Ocellated Flounder

To identify Ocellated Flounder (Ancylopsetta quadrocellata), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

The eyed side is typically light brown to grayish, mottled with darker spots and blotches, providing excellent camouflage. The most distinctive feature is the presence of four prominent, dark-ringed ocelli (eye-spots) arranged in a square pattern on the eyed side. The blind side is white.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Four prominent ocelli (eye-spots) on the eyed side, arranged in a square pattern., Dextral (right-eyed) orientation, meaning both eyes are on the right side of the head., Small mouth with sharp, conical teeth., Lateral line with a distinct arch over the pectoral fin.

Dorsal fin

Originates anterior to the upper eye, with 65-75 rays. Extends almost the entire length of the body.

Tail fin

Rounded to slightly truncate caudal fin.

Pectoral fin

Well-developed, with 10-12 rays on the eyed side, smaller or absent on the blind side.

Distinctive fins

Anal fin with 50-60 rays, mirroring the dorsal fin in shape and length.

Identification Tips

1. 1

   Ocelli

   Look for the four distinct, dark-ringed eye-spots arranged in a square pattern on the upper (eyed) side of the body. This is the most reliable distinguishing feature.

2. 2

   Eye Placement

   Confirm that both eyes are on the right side of the head (dextral flatfish).

3. 3

   Body Shape

   Observe the relatively oval to rounded body shape, typical of many flounders.

4. 4

   Lateral Line

   Note the distinct arch in the lateral line above the pectoral fin.

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