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Systematic position of the pelagic Thecosomata and Gymnosomata
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The sea butterflies (thecosomata) are just one of the two groups making up the pteropods, the other group being the sea angels (gymnosomata).
A taxonomy which is comparable to the one outlined here has recently been proposed by jeffery (2003). Jeffery consid- ered the thecosomata and gymnosomata to be suborders; the euthecosomata and pseudothecosomata in his scheme are infraorders of thecosomata.
What does sea-butterfly mean? any of various small marine gastropod mollusks of the orders thecosomata and gymnosomata, having a pair of winglike exte.
The thecosomata and gymnosomata of the siboga-expedition [tesch, johan jacob] on amazon.
Recent molecular data suggest the gymnosomata form a sister group to the thecosomata (other planktonic, weakly or nonmineralized gastropods), but this long-standing hypothesis has also had some recent detractors. In this clade, the foot of the gastropod has developed into wing-like flapping appendages (parapodia) and their shells have been lost.
The thecosomata and gymnosomata of california: veliger 3 (suppl.
Accessed systematic position of the pelagic thecosomata and gymnosomata within opisthobranchia.
The word is applied both to the sea butterflies in the clade thecosomata and also to the sea angels in the clade gymnosomata. The thecosomata have a shell, while the gymnosomata are without a shell.
Clades: thecosomata and gymnosomata, which is congruent with traditional classification but strongly supported by molec-ular evidence in the present study. An obvious shared character for pteropods are the wing-like structures or “parapodia” used for swimming.
The thecosomata and gymnosomata of the siboga-expedition very much like tliat of cavolinia inflexa.
In the gymnosomata, where the adult has no shell, the head is furnished with two pairs of cephalic tentacles - an anterior pair, which is not represented in thecosomata, and a posterior nuchal pair. The latter are eye-bearing in gymnosomata, in the adult creseis, and the young tiedemannia and spirialis among thecosomata.
Small animals constitute the order gymnosomata; those having a shell and feeding by means of cilia and mucus constitute the order thecosomata.
21 apr 2006 systematic position of the pelagic thecosomata and gymnosomata within opisthobranchia (mollusca, gastropoda) – revival of the pteropoda.
12 apr 2013 thecosomata are marine holoplanktonic opistobranch molluscs, which of homologous characters between gymnosomata and thecosomata.
1) gymnosomata zijn een clade van slakken (gastropoda) die behoren tot de stam de clade wordt verder onderverdeeld in thecosomata en gymnosomata,.
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(2007) holoplanktonic mollusca (gastropoda: pterotracheoidea, janthinoidea, thecosomata and gymnosomata) from the pliocene of pangasinan (luzon,.
Heteropods, fish, whales and gymnosomates are the main predators of thecosomates, although pelagic birds, sea turtles and medusae are also known to feed on thecosomata. They are active hunters, seizing prey with complex organs beset with hooks, sticky glands and suckers.
Items 1 - 20 of 271 sea angels (clade gymnosomata) are a large group of extremely small, suggest the gymnosomata form a sister group to the thecosomata.
15 feb 2021 pteropoda has two clades thecosomata, the sea butterflies, and gymnosomata, the sea angels.
26 apr 2020 systematic position of the pelagic thecosomata and gymnosomata within opisthobranchia (mollusca, gastropoda)—revival of the pteropoda.
Pteropoda (pelseneer, 1888) is de verouderde benaming van een orde die in tweeën is gesplitst: gymnosomata (blainville, 1824) en thecosomata (blainville,.
Recent molecular data suggest the gymnosomata form a sister group to the thecosomata (other planktonic, weakly or nonmineralized gastropods), but this long-standing hypothesis has also had some recent detractors. Fossils of the group go back to the middle frasnian stage of the late devonian period.
Holoplanktonic molluscs (gastropoda thecosomata, gymnosomata and heteropoda) from the waters of australia and papua new guinea their taxonomy,.
Thecosomata e gymnosomata (mollusca, gastropoda) da cadeia fernando de noronha, brasil by larrazábal maria eduarda de and oliveira valdeni soares de abstract.
10 dec 2012 thecosomata and pseudothecosomata) abundance and biomass data, in order the thecosomata (shelled pteropods) and the gymnosomata.
Many species are carnivorous feeding on small polychaetes, bivalves and foraminiferans.
They are classified into two informal groups: (1) superfamily pterotracheoidea (heteropoda) in the architaenioglossa and (2) the clades thecosomata and gymnosomata in the opisthobranchia (commonly referred to as pteropods).
Holoplanktonic mollusca (gastropoda: pterotracheoidea, janthinoidea, thecosomata and gymnosomata) from the pliocene of pangasinan (luzon, philippines).
Order gymnosomata the members of this order are pelagic sea slugs. They possess a shell in the larval stage but discard it at metamorphosis. The foot of the snail has developed into a wing-like appendage, allowing the animal to swim.
Small animals constitute the order gymnosomata; those having a shell and feeding by means of cilia and mucus constitute the order thecosomata. The shell is delicate and translucent; contrasting forms are seen in the straight-needle pteropod ( creseis acicula ), the coiled pteropod ( limacina species), and the long-snouted pteropod ( cavolina.
12 feb 2015 hierarchical subdivisions of the pteropoda including the orders thecosomata and gymnosomata.
Thecosomata: an order of pteropoda, having a mantle-skirt and shell: contrasted with gymnosomata.
18 sep 2007 gymnosomata and thecosomata and a strong correlation between the metabolic rates of pelagic snails of the closely related gymnosomata.
Koncentraciji biomase pteropodov iz obeh redov thecosomata in gymnosomata sta bili zabeleženi na severni polobli in sta znašali 2979,7 mg c m-3 in 5045.
Distribution of pteropods (mollusca: gastropoda: thecosomata) in surface waters (0-100 m) of gymnosomata (mollusca, gastropoda) da cadeina fernando.
1 dec 2020 one of the more striking differences between thecosomata and gymnosomata is that adult individuals with a calcified, aragonitic shell are only.
The fins of the pseudothecosomata are united into a continuous 'swimming plate' that is ventral to the mouth.
Systematic position of the pelagic thecosomata and gymnosomata within from the conspicuous antarctic pteropod clione antarctica (gymnosomata:.
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