Nemertea


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Related to Nemertea: Phoronida, Rotifera, Sipuncula

Nemertea

[nə′mərd·ē·ə]
(invertebrate zoology)
An equivalent name for Rhynchocoela.
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Taxonomic levels an PROTOZOA--"Amoebozoa"--"Lobosea"--testate amebas ANIMAL Cnidaria--Hydrozoa--Hydra Platyhelminthes--"Turbellaria" Tricladida Temnocephalida--Temnocephala Nemertea Mollusca Gastropoda Bivalvia Annelida Polychaeta--Histriobdellidae--Stratiodrilus Oligochaeta Nematoda Nematomorpha--Gordioida Arthropoda Chelicerata--Arachnida--Acari Crustacea Phyllopoda--Cladocera Malacostraca Decapoda Aeglidae--Aegla paulensis Schmitt, 1942 Trichodactylidae--Trichodactylus fluviatilis Latreille, 1828 Palaemonidae--Macrobrachium iheringi Ortmann, 1897 Amphipoda--Gammaridea Isopoda Maxillopoda Copepoda Ostracoda Tracheata--Hexapoda Collembola Isotomidae Sminthuridae Onychyuridae Table 2.
We encourage additional examination of self-fertility in other hermaphroditic nemertean species to determine if the pattern observed in coral is also present in Nemertea.
Filo Riqueza Valor Abundancia Valor (S) relativo (S) n relativo (n) Mollusca 95 41,48 4094 20,22 Arthropoda 47 20,52 7543 37,26 Annelida 40 17,47 4177 20,63 Echinodermata 15 6,55 2693 13,30 Cnidaria 11 4,80 1565 7,73 Porifera 6 2,62 48 0,24 Bryozoa 5 2,18 31 0,15 Nemertea 5 2,18 60 0,30 Chordata 2 0,87 23 0,11 Sipuncula 2 0,87 8 0,04 Platyhelminthes 1 0,44 1 0,005 Suma 229 100,00 20243 100,00 Tabla 2.
Disentangling ribbon worm relationships: multi-locus analysis supports traditional classification of the phylum Nemertea.
El total de taxa identificados en el Centro 1 fue de 105; 44 de estos taxa correspondieron al Phylum Annelida/ Clase Polychaeta, 28 al Phylum Arthropoda, 9 al Phylum Echinodermata, 20 al Phylum Mollusca, 1 al Phylum Nematoda, 1 al Phylum Nemertea, 1 al Phylum Platyelminthes y 1 al Phylum Priapula.
In marine worms belonging to the phylum Nemertea, oocyte maturation and fertilization are regulated by the same general kinds of signals that control such processes in mammals.
Although adult morphology varies vastly across the group, many core Lophotrochozoa (including the Mollusca, Annelida [including Vestimentifera, Pogonophora, and Echiura, and possibly Myzostoma, and Sipunculida], Gnathostomulida, Nemertea, dicyemid Mesozoa, Entoprocta, and some Platyhelminthes [including polyclad Turbellaria, Catenulida, and Macrostomida]) exhibit spiral cleavage, a highly conserved pattern of early development.
The Palaeone-mertea appears to be a basal paraphyletic assemblage within the Nemertea.
Among these are worm-shaped clades such as Plathelminthes or Nemertea, tentacle-bearing phyla such as Entoprocta and Lophophorata (Ectoprocta, Brachiopoda, and Phoronida), or highly mobile pelagic taxa such as cephalopod molluscs.