Platyrhinidae

Platyrhinoidis triseriata

The thorn - back guitar sharks ( Platyrhinidae ) are a family of rays, which occur on the continental shelf on the coast of northwestern (China, Japan and Vietnam ) and the north-eastern (California, Mexico) Pacific. The fish are sluggish bottom dwellers and sometimes frequently.

Features

They are one half to one meter long. Your body disc is rounded or cordate, the tail fins stem is strong, haiartig and about the same length as the body washer. On top of the tail fin stem are two large dorsal fins. The rostrum supporting cartilage is re-formed. On the back and on the tail fins stick to rows of the eponymous strong thorns that have evolved from placoid scales are.

System

The systematic classification of spike back - guitar sharks is controversial. While the American ichthyologist Joseph S. Nelson them in his standard work on fish systematics of subordination Platyrhinoidei to the stingray -like iwS ( Myliobatiformes ) counts, they are provided by other authors as a subfamily Platyrhininae into the family of violin (Rhinobatidae ).

Genera and species

There are two genera and five species:

• Platyrhina Platyrhina hyugaensis Iwatsuki, Miyamoto & Nakaya, 2011
• Platyrhina limboonkengi Tang, 1933
• Platyrhina sinensis ( Bloch & Schneider, 1801)
• Platyrhina tangi Iwatsuki, Zhang & Nakaya, 2011

• Platyrhinoidis triseriata ( Jordan & Gilbert, 1880)