Nakhang

Nakhang, mohiest az qatori nahangshaklhoi zersinfi lavhagalsamagiho. 3 zerqator dorad: Nahanghoi khozira, qadima va shokhdor. Darozii Nahanghoi hozira (Selachoidei) az 0,5 metr (Nahangi siyohi neshdor) to 20 metr (Nahangi azimjussa) ast. Tanashon dukmonand buda, az har du taraf 5-togy (Nahangi arrabini 6-to) surokhii galsama dorand. Onho pufakn shinovari nadorand. Dar obanborhoi kushoda (bazeashon dar daryoho; masalan, dar Amazon­ka, Gang) zindagi mekunand.

Dar SSSR dar bahrhoi Barens, Baltika, Siyoh, Azov va bahrhoi Sharki Dur duchor meoyand. Aksariyati onho tukhmguzor va bazeashon zindazoyand. Mohi, hayvonhoi bemuhrai qari ob, suzanpustho, narmbadanho, kirmho va gayraro mekhurand. Bazan ba odam niz hamla mekunand. Nahangho ahamiyati sanoati dorand. Az jigari onho ravgavi mohi va az skeletashon shiresh tayyor mekunand; gushtashon chun mahsuloti khuroki istifoda meshavad.

Nahanghoi qadima (Hexanchoidei) az har taraf 6 yo 7-togy surokhii galsama dorand. Ba du oila chudo mesha­vand: Nahanghoi plashdor (Chlamydose- lachidae), ki yak namud (Chlamydose- lachus anguineus) dorand va tegdandon (Hexanchidae). Nahanghoi shokhdor (Heterodontoidei); daroziashon to 1,5 metr. Yak jinsu (Heterodontus) 4 namudro dar bar megirand; asosan dar qismhoi tropiki va subtropikii uqyonushoi Orom va Hind vomekhurand.