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The teleosts are divided into the major clades shown on the cladogram, [19] with dates, following Near et al. [15] More recent research divide the teleosts into two major groups: Eloposteoglossocephala (Elopomorpha + Osteoglossomorpha) and Clupeocephala (the rest of the teleosts).
The two-part beak of the giant squid, Architeuthis sp. All living cephalopods have a two-part beak; [12]: 7 most have a radula, although it is reduced in most octopus and absent altogether in Spirula. [12]: 7 [98]: 110 They feed by capturing prey with their tentacles, drawing it into their mouth and taking bites from it. [25]
Teleosteomorpha is a clade of ray-finned fishes containing all teleost fish and their closest extinct relatives. [1] Also in this group are two diverse Mesozoic fish orders, the Aspidorhynchiformes and the Pachycormiformes . [ 2 ]
The suckers allow the octopus to secure itself in place or to handle objects. Each sucker is usually circular and bowl-like and has two distinct parts: an outer disc-shaped infundibulum and a inner cup-like called an acetabulum, both of which are thick muscles covered in connective tissue. A chitinous cuticle lines the outer surface. When a ...
Neopterygii includes the Holostei and the Teleostei, of which the latter comprise the vast majority of extant fishes, and over half of all living vertebrate species. [2] While living holosteans include only freshwater taxa, teleosts are diverse in both freshwater and marine environments. Many new species of teleosts are scientifically described ...
The tree of life. Two domains of life are Bacteria (top branches) and Archaea (bottom branches, including eukaryotes). The two-domain system is a biological classification by which all organisms in the tree of life are classified into two domains, Bacteria and Archaea.
The major divisions of Coleoidea are based upon the number of arms or tentacles and their structure. The extinct and most primitive form, the Belemnoidea , presumably had ten equally-sized arms in five pairs numbered dorsal to ventral as I, II, III, IV and V.
The endosymbiotic bacteria became the eukaryotic cell's mitochondria, providing most of the energy of the cell. [ 1 ] [ 5 ] Lynn Margulis and colleagues have suggested that the cell also acquired a Spirochaete bacterium as a symbiont, providing the cell skeleton of microtubules and the ability to move, including the ability to pull chromosomes ...