Could the mearas have been descended from the horses that the noldor brought with them out of Valinor. They did bring horses with them as it says in the Silmarillion that Maedros gave horses to Fingolfin to replace the ones that he lost when crossing the ice. The mearas could be descended from them, which would explain why the mearas were 'above' other horses, because they were descended from horses from Valinor.
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His sword was long his lance was keen
His shining helm afar was seen
The countless stars of heavens field
Were mirrored in his silver shield
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