Characteristics of Super Class Chondrichyes are given below:
1) Skeleton made of cartilage.
2) Body covered with triangular Placoid scales.
3) Ventral, sub terminal mouth with several rows of triangular teeth.
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4) Large caudal fin with the dorsal section larger than the ventral one.
5) Paired fins (pectoral and pelvic), are stiff and nonflexible.
6) They lack a swim bladder.
7) Ectothermic
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8) Internal fertilization. Ovoviviparous (developing egg kept inside the female for protection and does not live off of the parent).
9) Marine organisms only.
10) Lateral line
11) Two chambered heart
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12) Gills used for respiration
13) No external ears
14) No eye lids
15) Pelvic fines may have clappers in male.
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16) Eggs macrolectithal.
17) Nostrils usually two.
18) No internal nares.