How to Identify Bar-tailed Flathead

To identify Bar-tailed Flathead (Platycephalus endrachtensis), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

Dorsal surface typically mottled brown, grey, or sandy, providing excellent camouflage against the substrate. Ventral surface is whitish. Distinctive dark bars or spots on the caudal fin are a key identification feature.

Scale type

ctenoid

Mouth position

superior

Distinctive features

Greatly depressed and broad head, Two distinct dorsal fins, Large, upward-pointing eyes, Prominent spines on the operculum and preoperculum, Caudal fin with 3-5 dark, irregular cross-bars or blotches

Dorsal fin

First dorsal fin with 8-9 spines; second dorsal fin with 11-13 soft rays. The first spine is typically very short.

Tail fin

Truncate to slightly rounded, with 3-5 prominent dark cross-bars or blotches, giving it the 'bar-tailed' name.

Pectoral fin

Relatively large and rounded, with 18-21 rays.

Distinctive fins

Pelvic fins are thoracic, located beneath the pectoral fins, and are often used to prop the fish up from the substrate.

Identification Tips

1. 1

   Caudal Fin Markings

   Look for the characteristic 3-5 dark, irregular cross-bars or blotches on the tail fin. This is the most reliable distinguishing feature.

2. 2

   Head Shape

   The head is notably broad and depressed, with large, dorsally-placed eyes.

3. 3

   Preopercular Spines

   Examine the preopercular margin; Platycephalus endrachtensis typically has two prominent spines, with the lower spine being longer than the upper.

4. 4

   Lateral Line

   The lateral line is complete and smooth, without any prominent keels or spines.

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