What is the different between elasmobranchii and holocephali?

Teleost fish

The endoskeleton made of bone.

Gills covered by operculam.

Homocercal tail.

Oviparous.

ELASMOBRANCH

endoskeieton made of cartilage.

Gill slits present,not covered.

Viviparous.

Heterocercal tail.