Τάξη Σύνοψη for Myliobatiformes
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Κύρια Αναφ. |
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Τάξη |
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Myliobatiformes stingrays |
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Κλάση |
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Elasmobranchii |
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Αδελφή Τάξη |
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Torpediniformes 50 M years |
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Αναφ. |
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Πρώτη καταγραφή απολιθώματος |
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Παρουσία σε |
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Θαλασσινό(ά) |
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Υφάλμυρο |
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Σχόλιο |
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Gill openings ventral; anterior edge of the greatly enlarged pectoral fin attached to side of head, anterior to the gill openings; anal fin absent; eyes and spiracles on dorsal surface; anterior vertebrae fused to form a synarcual; suprascapulae of pectoral girdles joined dorsally over vertebral column and articulating with column of synarcual or fused with synarcual; nictitating membrane absent, cornea attached directly to skin around the eyes; body generally strongly depressed; jaws protrusible in most; teeth pavementlike; in most, water for breathing taken in chiefly through the spiracle rather than the mouth (except for those living off the bottom); most give birth to live young (some have eggs encased in a horny capsule); the snout may function as an electroreceptive organ (as may be true for all elasmobranchs). |
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Κλάση Ετυμολογία |
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Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335. |
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Τάξη Ετυμολογία |
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Greek, mylo = mill + Greek, + Greek, batis,-idos = a ray (Raja sp.) (Ref. 45335). forma = shape (Ref. 45335). |
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Οικογένειες |
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