Abstract
The first known fossil specimens of pipehorses (Haliichthyinae) were unearthed from the Middle Miocene (Sarmatian) beds of the Coprolitic Horizon in the Tunjice Hills, Slovenia. These fossil pipehorses belong to a new genus and species Hippohaliichthys edis, which was similar to the extant species Haliichthys taeniophorus. The body morphology indicates that the described fossil pipehorses were also closely related to the pygmy pipehorse Hippotropiscis frenki and the seahorse Hippocampus sarmaticus, two taxa which were also found in the Coprolitic Horizon. The described fossil material of pipehorses indicates that seahorses evolved from a group of pipehorses that were similar in size and shape to extant and fossil pipehorses of the Haliichthyinae subfamily.
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