Phylum annelida
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Phylum Annelida. The polychaetes , worms, and leeches. Annelids are all segmented Series of repeated ring-like units (segments) All have a head with a well-developed cerebral ganglion (primitive brain) Many have eyes with lens and retinas

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Phylum Annelida

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Phylum annelida

Phylum Annelida

The polychaetes, worms, and leeches


Phylum annelida

  • Annelids are all segmented

    • Series of repeated ring-like units (segments)

  • All have a head with a well-developed cerebral ganglion (primitive brain)

  • Many have eyes with lens and retinas

  • If an Annelid is cut in pieces, usually only the parts containing the head or tail can regenerate

  • Segments are divided by partitions called Septa

NOAA


Phylum annelida

  • Each segment has a pair of excretory organs (nephridia), a ganglion, structures for locomotion, and many also have a set reproductive structures

  • Annelids also have a closed-circulatory system (blood vessels)

  • More advanced digestive system with a:

    • Crop: stores food prior to:

    • Gizzard: grinds food particles

    • Intestine: absorb nutrients


Phylum annelida

  • Nephridia are cilliated tubes open to the outside for removing wastes

  • Setae are bristles made of chitin on each segment that gives the worm a grip in the dirt

PiotrRotkiewickz


Phylum annelida

  • Phylum Annelida

    • Class Polychaeta: the Polychaetes

      • Can swim or crawl and some species even build tubes or burrows of mud, sand, or calcium carbonate

Karen Osborn of Scripps Oceanography


Phylum annelida

  • Phylum Annelida

    • Class Polychaeta

Nick Hobgood


Phylum annelida

  • Phylum Annelida

    • Class Clitellata: Earthworms and Leeches

      • Only half of known leeches suck blood, the other half eat detritus and small animals

www.pbs.org


Phylum annelida

  • Gas exchange: diffusion through skin

  • Circulation: closed circulatory system with many having multiple hearts

  • Excretion: nephridia

  • Digestion: Complete digestive system, mouth to pharynx to esophagus to crop to gizzard to intestines to anus

  • Reproduction: sexual, some hermaphrodites (earthworms)

  • Response to environment: light and touch sensitive organs plus they have a brain!

  • Movement: Setae provide traction, they can swim, crawl or burrow


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