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The literature on cephalopod size has been further muddied by the frequent misattribution of various squid specimens to the giant squid genus Architeuthis, often based solely on their large size. In the academic literature alone, such misidentifications encompass at least the oegopsid families Chiroteuthidae , Cranchiidae , Ommastrephidae ...
The cephalopods were once thought to have evolved from a monoplacophoran-like ancestor [8] with a curved, tapering shell, [9] and to be closely related to the gastropods (snails). [10] The similarity of the early shelled cephalopod Plectronoceras to some gastropods was used to support this view.
Endocerida is an extinct nautiloid order, a group of cephalopods from the Lower Paleozoic with cone-like deposits in their siphuncle. Endocerida was a diverse group of cephalopods that lived from the Early Ordovician possibly to the Late Silurian. Their shells were variable in form.
The longest venomous snake is the king cobra (Ophiophagus hannah), with lengths (recorded in captivity) of up to 5.7 m (19 ft) and a weight of up to 12.7 kg (28 lb). [53] It is also the largest elapid. The second-longest venomous snake in the world is possibly the African black mamba (Dendroaspis polylepis), which
Cephalopod eggs span a large range of sizes, from 1 to 30 mm in diameter. [129] The fertilised ovum initially divides to produce a disc of germinal cells at one pole, with the yolk remaining at the opposite pole. The germinal disc grows to envelop and eventually absorb the yolk, forming the embryo.
A close rival in size to those snakes is palaeophiid marine snake Palaeophis colossaeus, which may have been around 9 m (30 ft) in length [271] [273] [274] or even up to 12.3 m (40 ft). [275] Another known very large fossil snake is Gigantophis garstini , estimated at 9.3–10.7 m (31–35 ft) in length, [ 276 ] [ 277 ] although later study ...
Gigantophis is only known from a few vertebrae and the morphology of Madtsoiidae snakes are not very well known. However, Gigantophis has been estimated as one of the largest snakes to have lived. It was estimated between 9.3 and 10.7 metres (31 and 35 ft) in length by Jason Head & P. David Polly in 2004 using regression analysis (the ...
Cameroceras exhibited a broad range of sizes, and some species were fairly large by extinct cephalopod standards. One species, C. turrisoides from the Boda Limestone of Sweden , [ 2 ] is estimated to have shell around 2 metres (6.6 ft) in length, [ 3 ] while that of C. rowenaense was about 70 centimetres (2.3 ft). [ 1 ]