Dibranchiata - définition. Qu'est-ce que Dibranchiata
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Qu'est-ce (qui) est Dibranchiata - définition

SUBCLASS OF MOLLUSCS
Coleoid; Dibranchiata; Coleoids; Soft-bodied cephalopods

Dibranchiata         
·noun ·pl An order of cephalopods which includes those with two gills, an apparatus for emitting an inky fluid, and either eight or ten cephalic arms bearing suckers or hooks, as the octopi and squids. ·see Cephalopoda.
Glycera dibranchiata         
SPECIES OF ANNELID
Glycera dibranchiata, also known as one variant of bloodworm, are segmented, red marine worms that grow up to 14-inches in length and have unique copper teeth made up of a mixture of protein, melanin and 10% copper. This copper concentration is the highest among any animal.

Wikipédia

Coleoidea

Subclass Coleoidea, or Dibranchiata, is the grouping of cephalopods containing all the various taxa popularly thought of as "soft-bodied" or "shell-less" (i.e., octopuses, squid and cuttlefish). Unlike its extant sister group, Nautiloidea, whose members have a rigid outer shell for protection, the coleoids have at most an internal cuttlebone, gladius, or shell that is used for buoyancy or support. Some species have lost their cuttlebone altogether, while in some it has been replaced by a chitinous support structure. A unique trait of the group is the ability to edit their own RNA.

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. More modern species either modified or lost a pair of arms. The superorder Decapodiformes has arm pair IV modified into long tentacles with suckers generally only on the club-shaped distal end. Superorder Octopodiformes has modifications to arm pair II; it is significantly reduced and used only as a sensory filament in the Vampyromorphida, while Octopoda species have totally lost that arm pair.