What is this?

[Coco]

On 11/06/2018 at 7:28 PM, sixgill pete said:

@Sarahjane216 Also if you read the pinned topics, using U.S. coins for scale is not helping out our international members. People in France or Australia or China probably have no idea what the size of a U.S. quarter is. Taking a measurement of each dimension or at least an approximate measurement is best. And using the metric system allows all members to know the size. Remember only the U.S. and a small handful of other countries Do Not use the metric system.

 

I really do think your item is a male Raja sp. tooth. But good views of it from several angles could confirm or dismiss this.

 

Thanks Sixgill pete

 

To put a coin, the best solution is to put the measure in cm (even in thumb, we shall manage ! 1 cm = 2.56").

 

In this case here, it would have been more useful to say (for example) that the gap between every line is 5 mm (0,5 cm).

 

Coco