Читать книгу Clinical Guide to Fish Medicine - Группа авторов - Страница 84

Guitarfish (Rhinobatidae) have a stout tail, with two dorsal fins, and a caudal fin without a barb. Bowmouth guitarfish (Rhina ancylostoma) are similar but their tail is bilobed and their rostrum is unique. The sawfish (Pristidae), also known as carpenter sharks, have a rostrum shaped like a flat blade with non‐replaceable “teeth” (modified dermal denticles) embedded on the sides (Nelson et al. 2016). The mouth and nares are ventral. Oral dentition varies but teeth are mostly blunt‐edged “cobblestones” in rows. Spiracles are prominent. There are no anal fins.