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  2. Sipunculus nudus - Wikipedia

    en.wikipedia.org/wiki/Sipunculus_nudus

    Sipunculus nudus is commonly found on subtidal zones of sandy shores to seabeds 900 metres (3,000 ft) deep in temperate or tropical waters worldwide. The worm hides in sand burrows which it makes by itself during the day and may extend its tentacles out of the burrow to feed at night.

  3. Marine coastal ecosystem - Wikipedia

    en.wikipedia.org/wiki/Marine_coastal_ecosystem

    There are four physical divisions of the intertidal zone with each one having its distinct characteristics and wildlife. These divisions are the Spray zone, High intertidal zone, Middle Intertidal zone, and Low intertidal zone. The Spray zone is a damp area that is usually only reached by the ocean and submerged only under high tides or storms.

  4. Intertidal zone - Wikipedia

    en.wikipedia.org/wiki/Intertidal_zone

    Marine biologists divide the intertidal region into three zones (low, middle, and high), based on the overall average exposure of the zone. [2] The low intertidal zone, which borders on the shallow subtidal zone, is only exposed to air at the lowest of low tides and is primarily marine in character.

  5. Macrobenthos - Wikipedia

    en.wikipedia.org/wiki/Macrobenthos

    Macrobenthos consists of the organisms that live at the bottom of a water column [1] and are visible to the naked eye. [2] In some classification schemes, these organisms are larger than 1 mm; [1] in another, the smallest dimension must be at least 0.5 mm. [3] They include polychaete worms, pelecypods, anthozoans, echinoderms, sponges, ascidians, crustaceans.

  6. Codium fragile - Wikipedia

    en.wikipedia.org/wiki/Codium_fragile

    This is a dominant subspecies in the subtidal zone, attaching to almost any hard surface. This results in increased maintenance labor for aquaculturists and reduces the productivity of cultured marine life. In established shellfish beds, this species can become a nuisance; it may attach to shellfish and then float away, carrying the animals ...

  7. Rocky shore - Wikipedia

    en.wikipedia.org/wiki/Rocky_shore

    Between the high and low-tide marks is the intertidal or littoral zone. Below the low-tide mark is the sublittoral or subtidal zone. The presence and abundance of different animals and algae vary in different zones along the rocky shore due to differing adaptations to the varying levels of exposure to sun and desiccation along the rocky shore.

  8. Priapulus caudatus - Wikipedia

    en.wikipedia.org/wiki/Priapulus_caudatus

    Priapulus caudatus is one of only nineteen known species in the phylum Priapulida. [2] French naturalist Jean-Baptiste Lamarck first described it in 1816. [1] Phylogenetic studies have indicated that scalidophorans, to which priapulids belong, are a basal clade of ecdysozoans (animals that grow by shedding their exoskeleton), and thus a sister group to all other ecdysozoans, an assortment ...

  9. Intertidal ecology - Wikipedia

    en.wikipedia.org/wiki/Intertidal_ecology

    Organisms living in this zone have a highly variable and often hostile environment, and have evolved various adaptations to cope with and even exploit these conditions. One easily visible feature of intertidal communities is vertical zonation , where the community is divided into distinct vertical bands of specific species going up the shore.