How to Identify Marbled Flathead

To identify Marbled Flathead (Platycephalus marmoratus), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

Dorsal surface typically mottled brown, grey, and white, providing excellent camouflage against sandy or rocky substrates. Ventral surface is paler, often whitish. Fins may have faint banding or spotting.

Scale type

ctenoid

Mouth position

terminal

Distinctive features

Greatly depressed and broad head, Large, upward-facing eyes positioned dorsally, Two distinct dorsal fins, the first spiny and the second soft-rayed, Preopercular spines, typically two prominent ones on the lower margin, Lateral line scales are smooth and complete, Mouth is large and terminal, extending to below the eye

Dorsal fin

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

Tail fin

Caudal fin is rounded to truncate, often with a dark blotch or band.

Pectoral fin

Pectoral fins are moderately sized, with 18-20 rays.

Distinctive fins

Pelvic fins are thoracic, located beneath the pectoral fins, and are relatively large, aiding in resting on the substrate.

Identification Tips

1. 1

   Head Shape

   Look for the distinctly flattened and broad head, which is wider than the body.

2. 2

   Eye Position

   The eyes are large and situated on the top of the head, allowing them to observe prey from their buried position.

3. 3

   Coloration and Pattern

   The marbled, cryptic pattern of browns, greys, and whites is a key identifier, helping it blend with the substrate.

4. 4

   Preopercular Spines

   Carefully observe the two prominent spines on the lower margin of the preoperculum (cheek bone).

5. 5

   Dorsal Fins

   Note the two separate dorsal fins; the first is spiny and the second is soft-rayed.

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