Taxonomy of Finfish (1+2)

Mustelus mosis Hemprich & Ehrenberg,1899)

Classification

Phylum: Chordata

Class: Chondrichthyes

Subclass : Elasmobranchii

Order Carcharhiniformes:

Family : Triakidae

Genera : Mustelus Species :mosis

Key character used for the identification of the order Carcharhiniformes:

• Two dorsal fins without spines
• anal fin present
• Five gill slits. the last one to three over thepectoral fin
• Gill rakers absent
• Eye with nictitating fold or membrane
• Intestinal value of spiral or scroll type

Key character used for the identification of the family Triakidae:

• 5 gill slits, the last pair posterior to pectoral fin origins;
• Teeth either numerous, small, cuspless (orweak-cusped) arranged in a pavement (Mustelus)
• First dorsal fin its base entirely anterior to pelvic fins: second dorsal fin somewhat smaller than the first, originating ahead of anal fin; anal fin as large as or smaller than the second dorsal;
• Caudal fin without keels or precaudal pits.
• Intestine with a corkscrew or auger-like spiral valve,

Key character used for the identification of the genus Mustelus

• Origin of first dorsal fin further back, over inner margins of pectorals
• Ventral caudal fin lobe absent or short in adults,weak or absent in young;
• second dorsal fin nearly as large as first,
• or behind them Snout parabolic in dorso ventral view,angular and pointed in lateral view;
• mouth angular, lower jaw with straight or nearly straight edges
• teeth with cusps absent
• body without black spots

Key character used forthe identification of the species Mustelusmosis

· Upper labial furrows about as long as or slightlylonger than lowers

· body unspotted