Order Summary for Atheriniformes
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Main Ref |
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Order |
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Atheriniformes silversides |
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Class |
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Actinopterygii |
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Sister Order |
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Beloniformes 45 M years |
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Ref.. |
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First Fossil Record |
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early Tertiary |
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Occurs in |
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Marine |
Fresh |
Brackish |
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Remark |
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Usually two dorsal fins, the first, if present, with flexible spines; anal fin usually preceded by a spine; lateral line absent or very weak; branchiostegal rays 4-7; narial openings paired; pelvic fins abdominal, subadominal, or thoracic in position (essentially absent in female phallostethids and highly modified in male phallostethids); parietals usually present. |
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Classetymology |
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Greek aktis = ray, thunderbolt, beam + Greek pterygion, diminutive of pteryx = wing, fin. Ref. 45335. |
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Orderetymology |
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Greek, atherine = a kind of smelt + Latin, forma = shape (Ref. 45335). |
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Families |
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Converted to PHP by Kit 06.10.09 |