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Errantia is a diverse group of marine polychaete worms in the phylum Annelida. Traditionally a subclass of the paraphyletic class Polychaeta, [4] it is currently regarded as a monophyletic group within the larger Pleistoannelida, composed of Errantia and Sedentaria. [2] These worms are found worldwide in marine environments and brackish water.
These are on alternate segments and do not meet dorsally, leaving the central line of the body uncovered. A. vittata is a pale yellowish colour, with a few faint transverse bands, and a dark stripe located across segments 7 and 8. It can grow to a length of 8 to 10 cm (3 to 4 in) but is usually shorter. [2]
Astronaut photo of Cape Town showing the Cape Peninsula, and surrounding waters, including False Bay. Map showing approximate extent of the range of the article and identifying key locations and the borders of the Table Mountain National Park Marine Protected Area Marine ecoregions of the South African exclusive economic zone Marine species distribution reference map of the Southern African ...
Siboglinidae is a family of polychaete annelid worms whose members made up the former phyla Pogonophora and Vestimentifera (the giant tube worms). [1] [2] The family is composed of around 100 species of vermiform creatures which live in thin tubes buried in sediment (Pogonophora) or in tubes attached to hard substratum (Vestimentifera) at ocean depths ranging from 100 to 10,000 m (300 to ...
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Orbiniida is an order of small polychaete worms in the phylum Annelida. [3] It is the earliest diverging clade in Sedentaria. [2] Along with Protodriliformia (in Errantia), this order is composed of meiofaunal marine worms formerly known as "archiannelids". [4]
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Platynereis dumerilii is a small marine ragworm: Males reach a length of 2 to 3 cm, while females reach a length of 3 to 4 cm. [9] Like a number of invertebrate phyla, Platynereis dumerilii has an axochord, a paired longitudinal muscle that displays striking similarities to the notochord regarding position, developmental origin, and expression profile. [10]