Amazing Arowana Fish "Osteoglossidae"
( Lucky Fish According To Feng Shui , Vastu Is :- Arowana Fish )
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Arowanas are freshwater bony fish of the family Osteoglossidae, also known as bony tongues[1] (the latter name is now often reserved for Arapaimidae).[2] In this family of fish, the head is bony and the elongated body is covered by large, heavy scales, with a mosaic pattern of canals. The dorsal and anal fins have soft rays and are long based, while the pectoral and ventral fins are small. The name "bonytongues" is derived from a toothed bone on the floor of the mouth, the "tongue", equipped with teeth that bite against teeth on the roof of the mouth. The arowana is a facultative air breather and can obtain oxygen from air by sucking it into its swim bladder, which is lined with capillaries like lung tissue.[3]
Scientific classificatione
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Order: Osteoglossiformes
Suborder: Osteoglossoidei
Family: Osteoglossidae
Bonaparte, 1831
Evolution Edit
Osteoglossids are basal teleosts that originated some time during the Cretaceous, and are placed in the actinopterygiid order Osteoglossiformes. As traditionally defined, the family includes several extant species from South America, one from Africa, several from Asia, and two from Australia.[1] Today Arapaimidae is often regarded as a separate family, which includes the arapaimas and the African arowana.[2] Consequently, the South American genus Osteoglossum, and the Asian and Australian genus Scleropages are the only extant genera that remain in the osteoglossid family.[4] Arapaimidae and Osteoglossidae split about 220 million years ago (Mya), during the Late Triassic.[5]
A sketch of an African Arowana.
Within Osteoglossidae, the South America Osteoglossum arowanas diverged from the Asian and Australian Scleropages arowanas about 170 Mya, during the Middle Jurassic.[5]
The Osteoglossidae are the only exclusively freshwater fish family found on both sides of the Wallace Line.[6] This may be explained by the theory that Asian arowanas (S. formosus) diverged from the Australian Scleropages, S. jardinii and S. leichardti, about 140 Mya, making it likely that Asian arowanas were carried to Asia on the Indian subcontinent.[5][7]
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