In some groups of gastropods ( Opisthobranchia ) there is a degree of secondary detorsion or rotation towards the original position; this may be only partial detorsion or full detorsion.
12.
It was speculated as far back as 1985 that the Opisthobranchia were paraphyletic, based on morphological evidence, and had given rise to the Pulmonata, a group also of subclass rank.
13.
The Opisthobranchia included species in the order Cephalaspidea ( bubble shells and headshield slugs ), the sacoglossans, anaspidean sea hares, pelagic sea angels, sea butterflies, and many families of the Nudibranchia.
14.
""'Phylliroe " "'is a genus of average sized ( up to ), highly transparent pelagic nudibranchs, order Opisthobranchia, that consists of two known species.
15.
There are two families in this superfamily, which is listed as the only superfamily in the clade "'Umbraculida "'within the informal group Opisthobranchia in the taxonomy of Bouchet & Rocroi ( 2005 ).
16.
:: I'd be more likely to put it in Opisthobranchia, because they are somewhat more diverse in form, and some, like Gymnosomata look somewhat similar .-- talk ) 21 : 52, 27 February 2008 ( UTC)
17.
Traditionally, nudibranchs have been treated as the order Nudibranchia, located in the Since 2010, Opisthobranchia has been recognised as not a valid clade ( it is paraphyletic ) and instead Nudipleura has been placed as the first offshoot of Euthyneura ( which is the dominant clade of gastropods ).
18.
"' Opisthobranchs "'( } } ) are a large and diverse group of specialized complex gastropods that used to be united in the subclass "'Opisthobranchia "', but are no longer considered to represent a monophyletic grouping because it contains land snails and slugs, the Pulmonata.
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