Thecosomata


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Related to Thecosomata: Gymnosomata

The`co`so´ma`ta


n. pl.1.(Zool.) An order of Pteropoda comprising those species which have a shell. See Pteropoda.
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Beam trawl Average proportion of taxon per station Classification Taxon Mean SD Porifera Porifera 8.167 21.417 Ctenophora Ctenophora 2.658 7.609 Cnidaria Cnidaria 0.228 1.734 Nemertea Nemertea 0.009 0.045 Polychaeta Polychaeta 0.213 1.117 Mollusca Gastropoda 2.662 6.240 Nudibranchia 3.178 8.731 Thecosomata 0.019 0.144 Bivalvia 5.175 11.603 Placopecten magellanicus 0.763 3.480 Decapodiformes 0.045 0.206 Merostomata Limulus polyphemus Crustacea Peracarida 0.755 1.958 Unclassified shrimp Caridea 28.073 27.011 Penaeus setiferus 0.107 0.571 Homarus americanus Pagurus spp.
Incluyen los ordenes Thecosomata y Gymnosomata (Lalli & Gilmer, 1989).
Todas las especies identificadas en este estudio, tambien se distribuyen en el Atlantico frente a la costa argentina, que incluye 56 especies de Thecosomata (Euthecosomata: 43 especies y Pseudothecosomata: 13 especies) (Van der Spoel & Boltovskoy, 1981).
Distribucion de los pteropodos (Gastropoda: Thecosomata y Pseudothecosomata) en el Golfo de Mexico y zonas adyacentes, Rey.
In opisthobranchs the formation of four equal quadrants is the rule, with the exception of the Thecosomata, Aplysiomorpha and Umbraculomorpha, where the quadrants are unequal.
In the opisthobranchs Cavolinia tridentata (Fol 1875) and Cymbulia peronii (Pelseneer 1911), representatives of the Thecosomata, it has been observed that the A, B, and C quadrants are larger than D.
Diet of Limacina helicana (Gastropoda: Thecosomata) in Arctic waters in midsummer Marine Ecology Progress Series 77:125-134.
Although most gastropods were unidentified, 13 species were pelagic pteropods (group Thecosomata); cavolinid pteropods (40%) were the most frequently consumed pelagic pteropods.
Fish larvae showed the highest taxa number (107 taxa ranging from family to species) decreasing with Decapoda (56), Copepoda (35), Thecosomata (17), Amphipoda (15), Siphonophora (10), Chaetognatha (7), Euphausiacea (6), Cladocera (2), Mysidacea (2), Appendicularia (1), and Cephalopoda (1) (Table 3).
Se identificaron los siguientes grupos del holozooplancton: radiolarios (Clase Radiolaria), foraminiferos (Orden Foraminifera), sifonoforos (Orden Siphonophora), medusas (Clase Hydrozoa excepto sifonoforos), clenoforos (Phylum Ctenophora), tecosornados (Orden Thecosomata), gimnosomados (Orden Gymnosomata), heteropodos (Suborden Heteropoda), poliquetos (Clase Polychaeta), cladoceros (Orden Cladocera), ostracodos (Subclase Ostracoda), copepodos (Subclase Copepoda), misidaceos (Orden Mysidacea), anfipodos (Orden Amphipoda), eufausidos (Orden Euphausiacea), decapodos pelagicos (Orden Decapoda), quetognatos (Phyllum Chaetognata), apendicularias (Orden Appendicularia) y tunicados (Clase Thaliacea).
Copepods, larvaceans, and pteropods (Thecosomata) each occurred in >20% of the stomachs and had mean individual prey weights <0.8 mg.
In order to cover all the water masses that have a seasonal influence on the continental shelf of the extreme south of Brazil, the zooplankton groups pteropod Thecosomata (oceanic), cladoceran (coastalneritic), and chaetognaths (widely distributed) were selected and used for multivariate analyses, establishing associations of species as hydrological indicators.