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Actinopterygii (Actinopterygians)

      The Actinopterygii or ray-finned fishes constitute a class or sub-class of the bony fishes. The ray-finned fishes are so called because they possess lepidotrichia or "fin rays", their fins being webs of skin supported by bony or horny spines ("rays"), as opposed to the fleshy, lobed fins that characterize the class Sarcopterygii which also, however, possess lepidotrichia. These actinopterygian fin rays attach directly to the proximal or basal skeletal elements, the radials, which represent the link or connection between these fins and the internal skeleton (e.g., pelvic and pectoral girdles). In terms of numbers, actinopterygians are the dominant class of vertebrates, comprising nearly 96% of the 25,000 species of fish. They are ubiquitous throughout fresh water and marine environments from the deep sea to the highest mountain streams. Extant species can range in size from Paedocypris, at 8 millimetres, to the massive Ocean Sunfish, at 2,300 kilograms (5,100 lb), and the long-bodied Oarfish, to at least 11 metres.
The earliest known fossil Actinopterygiian is Andreolepis hedei, dating back 420 million years (Late Silurian). This microvertebrate has been uncovered in Russia, Sweden, and Estonia. Traditionally three grades of actinopterygians have been recognised: the Chondrostei, Holostei, and Teleostei. Some morphological evidence suggests that the second is paraphyletic and should be abandoned; however, recent work based on more complete sampling of fossil taxa, and also an analysis of DNA sequence data from the complete mitochondrial genome, supports its recognition. Nearly all living bony fishes are teleosts.

Source: http://en.wikipedia.org/wiki/Actinopterygii

Img. 106:
Sparidae PÈ118
Sparidae PÈ119
Sphaerolepis kounovicensisAD, Štamberk (2009) Št1
Sphaerolepis kounovicensis JZ6
Sphaerolepis kounovicensis JZ6
Sphaerolepis kounovicensis JZ3
Sphaerolepis kounovicensis JZ1
Sphaerolepis YA1327
Sphaerolepis YA1341
Sphaerolepis YA1246
Sphaerolepis YA1333
Sphaerolepis YA1328
Sphaerolepis YA1245
Sphaerolepis YA1335
Sphaerolepis YA1346
Spinarichthys dispersus Friè, 1895 JZ7
Teleostei indet. JS7
Teleostei indet. PO413
Teleostei indet.foto XB770
Tinca PÈ112

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]