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| | Biological Batteries |
 | | Electrogenic rays are sluggish, feeble swimmers that spend most of their daylight hours lying on the bottom at favored sites partially buried in the mud or sand, generally preferring the shallows; at night, they actively forage over nearby mud or sand bottoms, kelp forest floors, or over reef faces. |
 | | All electrogenic rays are classified within the order Torpediniformes, containing four families, nine genera and between 37 and 40 species. |
 | | The family Torpedindae is composed of a single genus (Torpedo) and some 14 to 17 species; torpedo rays are characterized by a round or oval flabby body disc with a straight or slightly notched anterior margin, two dorsal fins, slender jaws lacking labial cartilages, and a short tail with a well developed caudal (tail) fin. |
| www.elasmo-research.org /education/topics/p_batteries.htm (2186 words) |
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