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However, some skates have electric organs located in their tail. The main difference between skates and rays is that skates lay eggs, whereas rays give birth to live young. Moreover, skates can be more abundant than rays, and are fished for food in some parts of the world. [21] Skates swim with their pectoral fins
In addition, while traditional phylogenies often find electric rays to be the basalmost batoids, followed by the Rhinopristiformes, this analysis finds a polytomy between skates, electric rays, and thornbacks at the base of Batoidea, with weak support for skates being the actual most basal lineage, followed by a clade uniting the electric rays ...
Benthic rays rely entirely on rajiform locomotion. Another difference between the two is the role of the tail. Skates have larger tails with fins on them and they use them during turns. [6] The tails of rays appear to serve no function in swimming. Some rays, known as stingrays have a venomous barb on their tail that they whip around to defend ...
The class is divided into two subclasses: Elasmobranchii (sharks, rays, skates and sawfish) and Holocephali (chimaeras, sometimes called ghost sharks, which are sometimes separated into their own class). Extant chondrichthyans range in size from the 10 cm (3.9 in) finless sleeper ray to the over 10 m (33 ft) whale shark.
Elasmobranchii (/ ɪ ˌ l æ z m ə ˈ b r æ ŋ k i aɪ / [6]) is a subclass of Chondrichthyes or cartilaginous fish, including modern sharks (superorder Selachii), rays, skates, and sawfish (superorder Batoidea).
Rhina ancylostoma, also known as the bowmouth guitarfish, shark ray or mud skate, is a species of ray and a member of the family Rhinidae. Its evolutionary affinities are not fully resolved, though it may be related to true guitarfishes and skates .
Most species are carnivores, feeding on molluscs and other invertebrates on the sea bed, and small fish, but the manta ray feeds on plankton sieved out of the water as it swims by its wide open mouth. Some species are viviparous, others ovoviviparous (both giving birth to live young), but the skates lay eggs in horny cases known as mermaid's ...
Big skate egg cases are larger than most other skate egg cases; typically ranging from 210 to 280 mm in length and 110 to 180 mm in width. [1] [10] Big skates egg cases are approximately 15% of the overall length of the female skate. [1] The egg case is very smooth and lacks external fibrous material. [1]