Como identificar Skates and Rays

Para identificar Skates and Rays (Batoidea), observe estas características principais.

Características físicas

Formato do corpo

flat

Coloração

Highly variable, ranging from cryptic browns and grays to vibrant patterns, often countershaded with darker dorsal and lighter ventral surfaces.

Tipo de escama

placoid

Posição da boca

inferior

Características distintivas

Dorsoventrally flattened body, Greatly enlarged pectoral fins fused to the head, forming a disc, Ventral gill slits (typically 5 pairs), Eyes and spiracles located dorsally (except for electric rays), Absence of an anal fin, Tail often whip-like, sometimes bearing venomous spines (stingrays) or electric organs (electric rays)

Nadadeira dorsal

Typically two small dorsal fins located on the tail (skates) or absent/reduced (most rays).

Nadadeira caudal

Reduced or absent caudal fin in many species; often whip-like with or without a venomous spine.

Nadadeira peitoral

Greatly enlarged and fused to the head, forming the characteristic disc shape.

Nadadeiras características

Pelvic fins are typically small and located ventrally.

Dicas de identificação

1. 1

   Body Shape

   Observe the overall disc shape. Skates typically have a more rhomboidal or heart-shaped disc, while many rays have a more rounded or kite-like disc.

2. 2

   Tail Structure

   Skates generally have a thicker, fleshier tail with two small dorsal fins and a small caudal fin. Stingrays have a slender, whip-like tail often bearing one or more venomous barbed spines. Electric rays have a stout tail with well-developed caudal and dorsal fins.

3. 3

   Presence of Dorsal Fins

   Skates possess two small dorsal fins on their tail. Most true rays (Myliobatiformes) lack dorsal fins or have them greatly reduced.

4. 4

   Reproductive Strategy

   Skates are oviparous (egg-laying), producing distinctive leathery egg cases ('mermaid's purses'). Rays are viviparous (live-bearing), giving birth to live young.

5. 5

   Mouth and Teeth

   Examine the mouth and teeth. Benthic feeders often have crushing plates for mollusks and crustaceans, while pelagic filter feeders (e.g., manta rays) have reduced teeth and specialized gill rakers.

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