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  1. Many polychaetes hatch from their eggs into a particular type of planktonic larva, the trochophore, which later metamorphoses into a juvenile annelid. Some polychaetes, however, can reproduce asexually, by budding.
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    Polychaetes occur throughout the Earth's oceans at all depths, from forms that live as plankton near the surface, to a 2- to 3-cm specimen (still unclassified) observed by the robot ocean probe Nereus at the bottom of the Challenger Deep, the deepest known spot in the Earth's oceans.
    en.wikipedia.org
    Polychaetes are among the most common animals in shore line environments. The tubes sticking up from the sand in this picture, taken on a beach at Bahia de las Animas, Baja California, give some idea of how common polychaetes can be in such environments.
    Polychaetes show a great diversity in reproductive traits, but some patterns can be found, and the families can be grouped within long-living iteroparous forms, semelparous forms, and short-living iteroparous forms, the first being the msot common strategy.
    The most generalised polychaetes are those that crawl along the bottom, but others have adapted to many different ecological niches, including burrowing, swimming, pelagic life, tube-dwelling or boring, commensalism, and parasitism, requiring various modifications to their body structures.
    en.wikipedia.org
  3. The Life-Cycle of the Polychaete Nereis Virens

  4. POLYCHAETE REPRODUCTIVE PATTERNS, LIFE CYCLES AND LIFE …

  5. Genetic diversification and life-cycle of the polychaete

  6. Life Cycle and Population Dynamics of the Polychaete Perinereis ...

  7. The polychaete - Wiley Online Library

  8. Life Cycle and Population Structure of the - Springer

  9. REPRODUCTIVE AND LARVAL BIOLOGY OF THE NORTHEASTERN …