How to Identify Spinetail mobula

To identify Spinetail mobula (Mobula japanica), look at these key features.

Physical Characteristics

Body shape

flat

Coloration

Dorsal surface is typically dark grey to black, sometimes with a bluish sheen. The ventral surface is white, often with dark markings or blotches, particularly around the gill slits and mouth. The tips of the pectoral fins may be dark.

Scale type

placoid

Mouth position

terminal

Distinctive features

Broad, diamond-shaped disc, wider than long., Large, paddle-like cephalic fins that extend forward from the head., A small dorsal fin located at the base of the tail., A prominent, serrated caudal spine (stinger) at the base of the tail, though it is not venomous., Terminal mouth, positioned at the front of the head.

Dorsal fin

Small, triangular, located at the base of the tail.

Tail fin

Long, whip-like, without a caudal fin, but possessing a distinct spine.

Pectoral fin

Large, wing-like, forming the main body disc.

Distinctive fins

Cephalic fins are prominent and can be rolled up or extended to funnel food.

Identification Tips

1. 1

   Cephalic Fins

   Look for the large, paddle-like cephalic fins that project forward from the head. These are used to funnel plankton into the mouth.

2. 2

   Dorsal Fin and Tail Spine

   Observe the small dorsal fin at the base of the tail, followed by a distinct, serrated spine. This spine is a key differentiating feature from other mobulids that lack a spine or have a rudimentary one.

3. 3

   Coloration

   Note the dark dorsal surface and white ventral surface. The presence of dark markings or blotches on the underside, especially around the gill slits, can be helpful.

4. 4

   Mouth Position

   The mouth is terminal (at the very front of the head), unlike some other rays with subterminal mouths.

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