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masked stingaree
The masked stingaree (''Trygonoptera personata'') is a common species of stingray in the family Urolophidae, endemic to southwestern Australia. It prefers moderately deep areas of sand or seagrass some distance from shore, though it can be found in very shallow water or to a depth of . The masked stingaree can be identified by the two large, dark blotches on the upper surface of its rounded pectoral fin disc, one of which encompasses its eyes like a mask. The outer rims of its nostrils are expanded into prominent lobes, while between the nostrils is a skirt-like curtain of skin with a deeply fringed trailing margin. Its tail bears a small dorsal fin just before the stinging spine, and end in a leaf-like caudal fin. This species grows up to across.
The diet of the masked stingaree consists primarily of polychaete worms and crustaceans, with a general shift from the latter to the former as the ray ages. It is aplacental viviparous, with females typically bearing one pup annually and nourishing it with histotroph ("uterine milk"). The 10–12 month long gestation period consists of a five-month period of suspended development for the egg, followed by rapid growth of the embryo and birthing in late April or early May. The International Union for Conservation of Nature (IUCN) has listed the masked stingaree under Least Concern. Fishing pressure on this species is largely limited to a small number of scallop and prawn trawlers. Most such incidental captures result in the ray being released alive, though it does have a tendency to abort any unborn young during capture.
==Taxonomy==
Peter Last and Martin Gomon described the masked stingaree in a 1987 issue of ''Memoirs of the National Museum of Victoria'', giving it the specific epithet ''personata'' (from the Latin ''personatus'', meaning "masked") in reference to its distinctive coloration. A male across was designated as the type specimen; it was collected by the research trawler FRV ''Hai Kung'' from northeast of Cape Naturaliste in Western Australia on 23 April 1981.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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