Pristis
| Noun | 1. |  Pristis - type genus of the Pristidae |
| 单词 | pristis | |||
| 释义 | Pristis
PristisPristis(sawfish), the only genus of the family Pristidae. Sawfish are distinguished from other rays by their greatly elongated and flattened snout, which has toothlike structures on both sides. Saw sharks have a similar snout, but sawfish have a flatter body, no cirra, and ventral gill openings. There are seven species, distributed in the tropical and subtropical waters of oceans throughout the world. They live in shallows and occasionally enter rivers. Sawfish feed on fish and on invertebrates, which they sometimes dig up from the sand or mud with their snout. They are oviviviparous, producing 15 to 20 young. The American, or smalltooth, sawfish (P. pectinatus) reaches a length of 4.8 m and a weight of 2 tons. Sawfish have almost no commercial significance, and they are not harmful to man. Pristis
Synonyms for Pristis
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