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Orden Resumen for Carcharhiniformes
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Referencia principal |
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Orden |
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Carcharhiniformes ground sharks |
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Clase |
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Elasmobranchii |
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Orden hermana |
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Lamniformes 135 M years |
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Referencia |
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Primer expediente de fósil |
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early Cretaceous |
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Ocurre en |
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Marino |
Dulce |
Salobre |
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Observación |
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Two dorsal fins (one dorsal fin in the scyliorhinid Pentachus profundicolus, known only from the holotype), without spines; anal fin present; five gill slits, with the last one to three over the pectoral fin; gill rakers absent; eyes with nictitating fold or membrane; spiracles present or absent; intestinal value of spiral or scroll type. Development may be oviparous, ovoviparous, or viviparous. |
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Clase Etimologia |
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Greek eulanein, elasmos = metal beaten out + Greek brangchia = gills. Ref. 45335. |
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Orden Etimologia |
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Greek, carcharias = shark Latin, clupea}, sardine + {Latin. Shape}, look, appearance, shape. 1880 (Ref. 45335). |
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Familias |
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