Platynereis Festiva

	Platynereis Festiva ''Platynereis festiva'' is a species of annelid in the family Nereididae. It was originally described in the genus ''Nereis'' and later reassigned to the genus ''Platynereis ''Platynereis'' is a genus of marine biology, marine annelid worms that belongs to the Nereididae, a family of errant polychaete worms. The species ''Platynereis dumerilii'' is used in development biology to study development (embryogenesis), in ...''. References {{Taxonbar, from=Q2245589 Phyllodocida Animals described in 1874 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Annelid The annelids (Annelida , from Latin ', "little ring"), also known as the segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zones and hydrothermal vents, others in fresh water, and yet others in moist terrestrial environments. The Annelids are bilaterally symmetrical, triploblastic, coelomate, invertebrate organisms. They also have parapodia for locomotion. Most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include earthworms) and leech-like species. Cladistic research since 1997 has radically changed this scheme, viewing leeches as a sub-group of oligochaetes and oligochaetes as a sub-group of polychaetes. In addition, the Pogonophora, Echiura and Sipuncula, previously regarded as separate phyla, are now regarded as sub-groups of polycha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
picture info	Nereididae Nereididae (formerly spelled Nereidae) are a family of polychaete worms. It contains about 500 – mostly marine – species grouped into 42 genera. They may be commonly called ragworms or clam worms. Characteristics The prostomium of Nereididae bears a pair of palps that are differentiated into two units, the proximal unit is much larger than the distal unit. Parapodia are mostly biramous (only the first two pairs are uniramous). Peristomium fused with the first body segment, with usually two pairs of tentacular cirri. The first body segment with 1-2 pairs tentacular cirri without aciculae. Compound setae present. Notopodia are distinct (rarely reduced), usually with more flattened lobes, notosetae compound falcigers and/or spinigers (rarely notosetae absent). They have two prostomial antennae (absent in ''Micronereis''). Their pharynx, when everted, clearly consists of two portions, with a pair of strong jaws on the distal portion and usually with conical teeth on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Nereis ''Nereis'' is a genus of polychaete worms in the family Nereididae. It comprises many species, most of which are marine. ''Nereis'' possess setae and parapodia for locomotion and gas exchange. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor setae are for crawling, and are the bristles that are visible on the exterior of the Polychaeta. They are cylindrical in shape, found not only in sandy areas, and they are adapted to burrow. They often cling to seagrass (posidonia) or other grass on rocks and sometimes gather in large groups. Nereis worms are commonly known as rag worms or clam worms. The body is long, slender, and dorso-ventrally flattened, reaching a length of 5-30 cm. The head consists of two parts: a roughly triangular anterior lobe—the prostomium—and a posterior ring-like portion—the peristomium. The latter bears four pairs of tentacular cirri, dorsally two pairs of eyes, and ventrally a pair of short tw ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Platynereis ''Platynereis'' is a genus of marine biology, marine annelid worms that belongs to the Nereididae, a family of errant polychaete worms. The species ''Platynereis dumerilii'' is used in development biology to study development (embryogenesis), in particular because their embryos are largely transparent, and thus easy to follow. Apical organs such as this one are photosensitive which is a key component in their formation. They also have a common ancestor with cnidarians and bilaterians. Species * ''Platynereis abnormis'' * ''Platynereis antipoda'' * ''Platynereis arafurensis'' * ''Platynereis australis'' * ''Platynereis bengalensis'' * ''Platynereis bicanaliculata'' * ''Platynereis calodonta'' * ''Platynereis cebuensis'' * ''Platynereis coccinea'' * ''Platynereis cristatus'' * ''Platynereis dumerilii'' * ''Platynereis festiva'' * ''Platynereis fuscorubida'' * ''Platynereis hugonis'' * ''Platynereis hutchingsae'' * ''Platynereis insolita'' * ''Platynereis karaka'' * ''Platynereis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]
	Phyllodocida Phyllodocida is an order of polychaete worms in the subclass Aciculata. These worms are mostly marine, though some are found in brackish water. Most are active benthic creatures, moving over the surface or burrowing in sediments, or living in cracks and crevices in bedrock. A few construct tubes in which they live and some are pelagic, swimming through the water column. There are estimated to be more than 4,600 accepted species in the order. Characteristics Phyllodocida are segmented worms and range in size from a few millimetres long to over a metre. Each segment bears a pair of paddle-like parapodia. The prostomium generally has one or two pairs of eyes, a dorsal pair of antennae, a ventral pair of sensory palps and a pair of organs on the neck. The peristomium is a ring, often hidden dorsally by the prostomium and the first segment. There is a muscular proboscis with one or more pairs of jaws. The next few segments tend to differ from those further back in having enlarged do ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu]