Trygon is also known as
ASting ray
BElectric eel
CHammerhead shark
DManta ray
Answer:
A. Sting ray
Read Explanation:
Super class Pisces:
Class – Chondrichthyes:
- They are marine animals with streamlined body and have cartilaginous endoskeleton.
- Mouth is located ventrally.
- Notochord is persistent throughout life.
- The skin is tough, containing minute placoid scales.
- Teeth are modified placoid scales which are backwardly directed.
- Their jaws are very powerful. These animals are predaceous.
- Due to the absence of air bladder to swim constantly to avoid sinking
- Heart is two-chambered ( one auricle and one ventricle).
- Some of them have electric organs (e.g., Torpedo) and some possess poison sting (e.g., Trygon).
- They are cold blooded (poikilothermous) animals, i.e., they lack the capacity to regulate their body temperature.
- Sexes are separate.
- In males pelvic fins bear internal fertilisation and many of them are viviparous.
Examples:
- Scoliodon (Dog fish)
- Pristis (Saw fish)
- Carcharodon (Great white shark)
- Trygon (Sting ray)