Torpedinidae

Japanese: Torpedinidae

…
[Classification, Systematics]
Rays found in the waters around Japan are generally classified into eight families: the Pristidae, which have protruding snouts with jagged teeth on both sides, the Rhinobatidae, which have long snouts but no projections on either side, the Platyrhinidae, which have rounded body plates and fine scales all over their bodies, the Rajidae, which have a few scales on their backs and a long, slender tail, the Dasyatidae, which have almost no scales and a venomous stinger on its whip-like tail, the Torpedinidae, which have no scales at all and have an electric organ between their pectoral fins and head, the Myliobatidae, which have large pectoral fins and rounded protruding head tips, and the Mobulidae, which have bat-ear-like fins (cephalic fins) at the end of their heads. Other families found abroad include the freshwater Potamotrygonidae, which are similar to the stingray family, the Anacanthobatidae, whose snouts have filament-like protruding tips, and the Hexatrygonidae, which have six pairs of gill slits.

From [Electric ray]

…A general term for marine fish belonging to the Torpedinidae family, or one of these. The Japanese name comes from the fact that they have an electric organ, and the English name is also electric ray.

From "Electric Fish"

...The number and arrangement of electric plates vary depending on the fish species. In the Torpedinidae (electric ray), more than 1,000 electric plates are stacked like coins at the base of the pectoral fin to form electric columns, totaling about 2,000. Each column is connected in the same way as many batteries connected in parallel, which increases the capacity, making it suitable for passing electric current in seawater, which has low electrical resistance.

*Some of the terminology that mentions "Torpedinidae" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…
［分類，系統］
　日本近海のエイはふつう次の8科に分類される。吻（ふん）が突き出てその両側にぎざぎざのある歯が並ぶノコギリエイ科Pristidae，吻は長いが，両側に突起のないサカタザメ科Rhinobatidae，体板がまるく，体中に細かいうろこのあるウチワザメ科Platyrhinidae，背中に多少のうろこをもち尾部の細長いガンギエイ科Rajidae，うろこがほとんどなくむち状の尾に毒針のあるアカエイ科Dasyatidae，うろこはまったくなく，胸びれと頭の間に発電器官のあるシビレエイ科Torpedinidae，胸びれが大きく，頭の先端がまるく突き出たトビエイ科Myliobatidae，頭の先にコウモリの耳のようなひれ(頭鰭（とうき）)のあるイトマキエイ科Mobulidaeである。このほかアカエイ科に近い淡水産のPotamotrygonidae科，吻端がフィラメント状に突出するAnacanthobatidae科，鰓孔が6対あるHexatrygonidae科が外国に分布する。…

【シビレエイ】より

…エイ目シビレエイ科Torpedinidaeに属する海産魚の総称，またはそのうちの1種を指す。和名は発電器官があることに由来し，英名もelectoric ray(電気エイ)という。…

【電気魚】より

…電気板の数や並び方は魚種によって異なっている。　シビレエイ科Torpedinidae(英名electric ray)では，胸びれの基部に1000個以上の電気板が硬貨を積み上げたように重なって電気柱をつくり，その数約2000に及ぶ。各柱は多数の電池を並列につないだのと同じようにつながり，容量が大きくなるため，電気抵抗の低い海水中で電流を流すのに適する。…

※「Torpedinidae」について言及している用語解説の一部を掲載しています。

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