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All lungfish demonstrate an uninterrupted cartilaginous notochord and an extensively developed palatal dentition. Basal ("primitive") lungfish groups may retain marginal teeth and an ossified braincase, but derived lungfish groups, including all modern species, show a significant reduction in the marginal bones and a cartilaginous braincase.
Scincus scincus, also commonly known as the sandfish skink, common sandfish or common skink, is a species of skink notable for its burrowing or swimming behaviour in sand. [2] It is native to the Sahara Desert and the Arabian Peninsula , [ 3 ] [ 4 ] but is also kept as a pet elsewhere.
In addition to the top-mounted eyes, a stargazer also has a large, upward-facing mouth in a large head. Their usual habit is to bury themselves in sand, and leap upwards to ambush prey (benthic fish and invertebrates) that pass overhead. Some species have a worm-shaped lure growing out of the floors of their mouths, which they can wiggle to ...
Lesser weever fish, caught from the beach at Prestatyn, North Wales. Note the highly distinctive venomous dorsal spines (separated by almost black skin) and dark-tipped tail. Weevers (or weeverfish) are nine extant species of ray-finned fishes of the family Trachinidae in the order Perciformes, part of the wider clade Percomorpha.
A sand lance or sandlance is a ray-finned fish belonging to the family Ammodytidae. Several species of sand lances are commonly known as " sand eels ", though they are not related to true eels . Another variant name is launce , [ 2 ] and all names of the fish are references to its slender body and pointed snout.
The livers and stomachs of the Squalidae contain the compound squalamine, which possesses the property of reduction of small blood vessel growth in humans. [6] Dogfish sharks use their strong jaw and sharp teeth to consume their prey. The spiny dogfish has broken several records in the areas of migration and gestation.
The last common ancestor of lampreys appears to have been specialized to feed on the blood and body fluids of other fish after metamorphosis. [29] They attach their mouthparts to the target animal's body, then use three horny plates (laminae) on the tip of their piston-like tongue, one transversely and two longitudinally placed, to scrape ...
The Mediterranean sand smelt, Atherina hepsetus, is a species of fish in the family Atherinidae that inhabits the littoral zone of the east Atlantic, the Mediterranean and the Black Sea. [ 2 ] Description