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The two currently recognized extant species in this genus are: [5] Alepisaurus brevirostris Gibbs, 1960 (short-snouted lancetfish) Alepisaurus ferox R. T. Lowe, 1833 (long-snouted lancetfish) The anatomic difference between the two species is the shape of the snout, which is long and pointed in A. ferox, and slightly shorter in A. brevirostris.
Alepisaurus ferox, also known as the long snouted lancetfish, longnose lancetfish, or cannibal fish, is a species of lancetfish found in the ocean depths down to 1,830 m (6,000 ft). [ 3 ] [ 4 ] This species grows to 215 cm (85 in) in total length and a weight of 9 kg (20 lb).
Alepisaurus paronai is an extinct species of lancetfish known from a fossil skull found in Middle Miocene-aged strata in Piedmont, Italy.The skull is very similar in anatomy and dimensions to that of the extant long-snouted lancetfish. [1]
It is the study of extant taxa (singular: extant taxon): taxa (such as species, genera and families) with members still alive, as opposed to (all) being extinct. For example: For example: The Indian elephant ( Elephas maximus ) is an extant species, and the woolly mammoth ( Mammuthus primigenius ) is an extinct species.
Depending on the exact species involved, the maximum length of lancelets is typically 2.5 to 8 cm (1.0–3.1 in). [47] [48] Branchiostoma belcheri and B. lanceolatum are among the largest. [47] Except for the size, the species are very similar in general appearance, differing mainly in the number of myotomes and the pigmentation of their larvae ...
Molecular studies of extant amphibians based on multiple-locus data favor one or the other of the monophyletic alternatives and indicate a Late Carboniferous date for the divergence of the lineage leading to caecilians from the one leading to frogs and salamanders, and an early Permian date for the separation of the frog and salamander groups.
Osteoglossidae is a family of large-sized freshwater fish, which includes the arowanas.They are commonly known as bonytongues.The family has been regarded as containing two extant subfamilies Arapaiminae and Osteoglossinae, with a total of five living genera, [1] but these are regarded as valid families in Eschmeyer's Catalog of Fishes [2] The extinct Phareodontinae are known from worldwide ...
The currently recognized species in this genus are: [2] Anotopterus nikparini, Kukuev, 1998 (North Pacific daggertooth) Anotopterus pharao, Zugmayer, 1911 (daggertooth) Anotopterus vorax, Regan, 1913 (south ocean daggertooth) Anotopterus has long been considered a unique taxonomic family with close affinity to the families Paralepididae and ...