Information about Clitellata
| Clitellata | ||||||||
|---|---|---|---|---|---|---|---|---|
Earthworm | ||||||||
| Scientific classification | ||||||||
| ||||||||
| Subclasses | ||||||||
|
Branchiobdellae Hirudinea Oligochaeta | ||||||||
Contrary to the class of Polychaeta, they do not have parapodia and their head is less developed.
Habitats
Most clitellata live on land or in freshwater.Reproduction
All clitellata are hermaphrodites. During reproduction, the clitellum secretes a coat which hardens. The worm then creeps out backward from the coat and deposits either fertilized zygotes or both ovae and sperms into the coat, which is then packed into a cocoon. The zygotes then evolve further directly in the cocoon without passing through a larva stadium (as opposed to other annelids, e.g. polychaeta.) This mechanism is considered to be apomorphic (newer in evolution).[1]Classes
- Branchiobdellae, Leeches.
- Hirudinea, Leeches.
- Oligochaeta, Earthworms (aquatic microdriles + terrestrial megadriles).
References
External links
- Brief description
- An introductory key to revised earthworm family classification
- A Series of Searchable Texts on Earthworm Biodiversity, Ecology and Systematics from Various Regions of the World
Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
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Lophotrochozoa
Phyla
The Lophotrochozoa
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Phyla
- Amiskwia (incertae sedis)
- Nemertea
- Phoronida
- Bryozoa
- Entoprocta
- Brachiopoda
- Sipuncula
- Hyolitha †
- Mollusca
- Annelida
- Echiura
The Lophotrochozoa
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Annelida
Lamarck, 1809
Classes and subclasses
Class Polychaeta (paraphyletic?)
Class Clitellata*
Oligochaeta - earthworms, etc.
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Lamarck, 1809
Classes and subclasses
Class Polychaeta (paraphyletic?)
Class Clitellata*
Oligochaeta - earthworms, etc.
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Hirudinea
Lamarck, 1818
Genus: Macrobdella
Orders
Arhynchobdellida or Rhynchobdellida
There is some dispute as to whether Hirudinea should be a class itself, or a subclass of the Clitellata.
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Lamarck, 1818
Genus: Macrobdella
Orders
Arhynchobdellida or Rhynchobdellida
There is some dispute as to whether Hirudinea should be a class itself, or a subclass of the Clitellata.
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Oligochaeta
Orders
Haplotaxida
Lumbriculida
Oligochaeta (singular Oligochaete, IPA /ˈɒlɪgoʊˌkiːt/
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Orders
Haplotaxida
Lumbriculida
Oligochaeta (singular Oligochaete, IPA /ˈɒlɪgoʊˌkiːt/
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class is the rank in the scientific classification of organisms in biology below Phylum and above Order.
For example, Mammalia is the class used in the classification of dogs, whose phylum is Chordata (animals with notochords) and order is Carnivora (mammals that eat meat).
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For example, Mammalia is the class used in the classification of dogs, whose phylum is Chordata (animals with notochords) and order is Carnivora (mammals that eat meat).
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Annelida
Lamarck, 1809
Classes and subclasses
Class Polychaeta (paraphyletic?)
Class Clitellata*
Oligochaeta - earthworms, etc.
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Lamarck, 1809
Classes and subclasses
Class Polychaeta (paraphyletic?)
Class Clitellata*
Oligochaeta - earthworms, etc.
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original research or unverifiable claims.
* It needs additional references or sources for verification.
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* It needs additional references or sources for verification.
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In earthworms and some other annelids, the clitellum is a thickened glandular section of the body wall that secretes a viscid sac in which the eggs are deposited. Once the eggs have been deposited in the sac, the clitellum slides off of the earthworm's body.
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Polychaeta
Grube, 1850
Subclasses
Palpata
Scolecida
The Polychaeta or polychaetes are a class of annelid worms, generally marine.
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Grube, 1850
Subclasses
Palpata
Scolecida
The Polychaeta or polychaetes are a class of annelid worms, generally marine.
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Parapodia (Gr. para, beyond or beside + podia, feet), singular parapodium, are paired un-jointed lateral outgrowths. They are characteristic of Polychaeta, but they also occur in opisthobranch mollusks.
Parapodia are either uniramous or biramous.
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Parapodia are either uniramous or biramous.
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- For other meanings see Zygote (disambiguation).
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ovum (plural ova) is a haploid female reproductive cell or gamete. The word is derived from Latin, meaning egg or egg cell. Both animals and embryophytes have ova. The term ovule
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Hirudinea
Lamarck, 1818
Genus: Macrobdella
Orders
Arhynchobdellida or Rhynchobdellida
There is some dispute as to whether Hirudinea should be a class itself, or a subclass of the Clitellata.
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Lamarck, 1818
Genus: Macrobdella
Orders
Arhynchobdellida or Rhynchobdellida
There is some dispute as to whether Hirudinea should be a class itself, or a subclass of the Clitellata.
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Oligochaeta
Orders
Haplotaxida
Lumbriculida
Oligochaeta (singular Oligochaete, IPA /ˈɒlɪgoʊˌkiːt/
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Orders
Haplotaxida
Lumbriculida
Oligochaeta (singular Oligochaete, IPA /ˈɒlɪgoʊˌkiːt/
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