All true eels present a homocercal caudal,which different from the primitive bowfins,megalops, and *** white base and black margin,rear dorsal and anal fins confluent with caudal fin develop a unique and truncate-like...
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All true eels present a homocercal caudal,which different from the primitive bowfins,megalops, and *** white base and black margin,rear dorsal and anal fins confluent with caudal fin develop a unique and truncate-like tail,which make synaphobranchid eels different from other eels,while all true eels seems like the same when judge from their outer ***,further studies are proceeding on the skeleton which interiorly supported the caudal fin,to find more strong evidences standing for the above hypothesis,meanwhile,to elucidate the phylogenetic relationships of the Anguilliform fishes. Later,17 species of synaphobranchid eels including Simenchelys parasitca,Synaphobranchus affinis, Synaphobranchus kaupii,Synaphobranchus oregoni,Synaphobranchus bathybius,Synaphobranchus sp.,Ilyophis brunneus,Meadia abyssale,Meadia roseni,Dysommina rugosa,Dysomma anguillare, Dysomma dolichosomatum,Dysomma goslinei,Dysomma melanurum,Dysomma opisthoproctus, Dysorama polycatodon,and Dysomma longirostrum,and other true eels,***,Megalops,Elops, albulids,notacanthids,anguillids,muraenids,chlopsids,myrocongrids,congrids,ophichthids, muraenesocids,and nettastomatids,clupids etc.,were checked and studied with the anatomical microscope Leica MS,x-ray diagram,and double-stained *** comparisons with the general features and skeletal structure,this study shows(1)fusion of uroneural and urostyle,reduced hypurals and epurals developed a reduced tail,which sharing by most eels,undoubtedly,a monophyletic group.(2)Synaphobranchid eels sharing,a CLC-caudal-fin and elevated hypural 3-4-5, and fusion of hypural 4 and 5 supporting 12-19 soft rays,constructing a well-developed and distinct tail as mentioned above,while bowfins,megalops,elops,albulids share a heterocercal caudal,more than 5 separated hypurals,and more than 19 soft-fin rays,and most eels' caudal present FS-caudal-fin, lowered hypural 3-4-5,and separated or reduced hypural 4 and 5 supporting 6-13 soft ***, Synap
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