ideal for examining adaptive radiations in extreme environments. Did dorvilleid northern California and Oregon, dorvilleid polychaetes. Polychaeta is the largest class of phylum Annelida. The following is the discussion of the adaptive diversity of polychaetes, swim near the surface of the sea where the danger of predators and solar radiation is excessive. Phylogeny and Adaptive Radiation, Segmented Worms in The Diversity of On the other hand, polychaetes with well-developed parapodia are generally.

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The raptorial feeding is performed by eversible pharynx which is provided with chitinous jaws and dentacles on the internal lining.

These are marine, freely moving animals that crawl on sea bottom. Fields and applications Applications of evolution Biosocial criminology Ecological genetics Evolutionary aesthetics Evolutionary anthropology Evolutionary computation Evolutionary ecology Evolutionary economics Evolutionary epistemology Evolutionary ethics Evolutionary rzdiation theory Evolutionary linguistics Evolutionary medicine Evolutionary neuroscience Evolutionary physiology Evolutionary psychology Experimental evolution Phylogenetics Paleontology Selective breeding Speciation experiments Sociobiology Systematics Universal Darwinism.

Arenicola, Glycera, Amphitrite and Terebella Tubicolous polychaetes: Parapodia eadiation small and locomotion is by lateral undulation of body.

Nereis, Phyllodoce, Colycera Pelagic polychaetes: Genesis, explosive speciation, key-innovations and phylogeography of the haplochromine cichlid fishes”.

The Hawaiian honeycreepers form a large, highly morphologically diverse species group that began radiating in the early days of the Hawaiian archipelago. Head bears sense organs such as eyes, tentacles and palps. They are also known as carnivorous feeders.

Explain adaptive radiations in Polychaeta –

In Aphrodite the body is short and broad with arched dorsal side and a flat ventral side to permit creeping under the stones and crevices. Hawaii is also the site of a separate major floral adaptive radiation event: The tubes of various species vary greatly in form and construction. Sabella, Serpula Adaptive diversity according to Nutrition Raptorial feeders: For example, all members of the Malawi species flock are mouth-brooders, meaning the female keeps her eggs in her mouth until they hatch; in almost all species, the eggs are also fertilized in the female’s mouth, and in a few species, the females continue to guard their fry in their mouth after they hatch.


Ophellids, Maldanids Indirect deposit feeders- These axaptive lack proboscis instead they are provided with highly extensile ciliated grooved tentacles, secreting mucous. From Wikipedia, the free encyclopedia. This causes the sand to cave in forming a funnel-shaped depression at the surface.

Explain adaptive radiations in Polychaeta

These sand filters suspend food particles from the water percolating down the funnel. The haplochromine cichlid fishes in the Great Lakes of the East African Rift particularly in Lake TanganyikaLake Malawiand Lake Victoria form the most speciose modern example of adaptive radiation. A Story of Evolution in Our Time. Lake Victoria Rock Cichlids: Errant forms are carnivorous that feed on polycjaeta molluscs, crustaceans, sponges etc.

The Polyxhaeta honeycreepers are known for their beaks, which are specialized to satisfy a wide range of dietary needs: These worms are carnivorous and extend out from the tube openings to catch the prey. Sometimes these tubes may be covered by sand grains and shells Ex: Histriobdella lives as ectoparasite in the gill chamber of crustaceans and sucks blood.

Login ploychaeta post your comment here They live in temporary or permanent self-secreted tubes. Lake Victoria’s cichlids are also a species flock, once composed of some or more species.


Small food particles moving down the groove by ciliary action accumulate at the base of tentacles. In these animals water current carries micro-organisms inside the burrow and then tentacles move the food towards the mouth.

Pectenaria, Owenia, Diopatra, Clymenella. Evolution as fact and theory Social effects Creation—evolution controversy Objections to evolution Level of support. Adaptive radiation tends to take place under the following conditions: Sometimes these tubes may be covered by sand grains and shells. Proceedings of the National Academy of Sciences.

The other finches in the Galapagos are similarly uniquely adapted for their particular niche. Today represented by approximately 15 species, Darwin’s finches are Galapagos endemics famously adapted for a specialized feeding behavior although one species, the Cocos finch Pinaroloxias inornatais not found in the Galapagos but on the island of Cocos south adzptive Costa Rica.

The Ecology of Adaptive Radiation. They are also known as planktonic polychaetes. Sense organs on prostomium and peristomium are well developed due to the free swimming and crawling habit. Its anterior part of body and tentacles can be radiatiion out to collect planktonic food particles on which it feeds.

The shallow sea bottom is a source of food of great nutritional value as it contains bacteria, diatoms and other dead organic matter.