Rajiformes

Rajiformes /ˈrædʒɪfɔːrmiːz/ is one of the four orders in the clade Batomorphi, often referred to as the superorder Batoidea, flattened cartilaginous fishes related to sharks.[2] Rajiforms are distinguished by the presence of greatly enlarged pectoral fins, which reach as far forward as the sides of the head, with a generally flattened body.[4] Species of the order Rajiformes are found throughout the world's oceans, from Arctic to Antarctic waters, and from shallow coastal shelves to open seas and abyssal regions.[9] The extinct families Sclerorhynchidae and Ptychotrygonidae had long, serrated rostrums very similar to those of extant sawsharks and sawfishes, and their relation to them has been debated.Some species are viviparous, others ovoviviparous (both giving birth to live young), but the skates lay eggs in horny cases known as mermaid's purses.[citation needed] Most species are benthic, resting on the sandy or muddy sea bed, sometimes undulating their pectoral fins to stir up sediment and bury themselves shallowly.
Raja texana , the roundel skate
Skates have an electric organ in the tail. They use it to generate a weak electric field to locate their prey. [ 15 ]
PreꞒLittle skate (Leucoraja erinacea)Scientific classificationEukaryotaAnimaliaChordataChondrichthyesElasmobranchiiBatomorphiL. S. Bergorderssharkspectoral finsrajiform locomotionspiraclesmermaid's pursenictitating membranecorneacaudal peduncleAnacanthobatidaeArhynchobatidaeGurgesiellidaeRajidaeSclerorhynchoideiIschyrhizidaeSclerorhynchidaeOnchopristidaePtychotrygonidaeSchizorhizidaeRhinopristiformsAnacanthobatisRaja texanarostrumssawsharkssawfishesbatoidsSclerorhynchiformessister groupPristiorajeaSelachimorphaelectric organelectric field to locatecarnivoresplanktonviviparousovoviviparousmermaid's pursesbenthicpelagicNelson, J.S.John Wiley & SonsWorld Register of Marine SpeciesElectric fishElectroreception and electrogenesisJamming avoidance responseAmpullae of LorenziniKnollenorganGymnarchidaeGymnotiformesElectrophorusMormyridaeMalapteruridaeTorpediniformesUranoscopidaeHistory of bioelectricityLateral lineMagnetoreceptioncartilaginous fishVertebrataGnathostomataSelachii (sharks)Hexanchiformes (frilled and cow sharks)Squaliformes (dogfish sharks)Pristiophoriformes (sawsharks)Squatiniformes (angel sharks)Heterodontiformes (bullhead sharks)Orectolobiformes (carpet sharks)Carcharhiniformes (ground sharks)Lamniformes (mackerel sharks)Batoidea (rays)Torpediniformes (electric rays)Pristiformes (sawfishes)Myliobatiformes (stingrays and relatives)HolocephaliChimaeriformes (chimaeras)WikidataWikispeciesiNaturalistOpen Tree of LifePaleobiology Database