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How segments are related to bristles (setae)?

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How segments are related to bristles (setae)?

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Bristles are located on segments from mouth to anus (beginning and the end). The bristles will help annelida to move.

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Sabella pavonia

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Sabella pavonia 5, Slijkkokerworm, Saxifraga-Eric Gibcus.jpg

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Tubifex

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Lumbricus rubellus

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Kingdom - Animalia
Phylum - Annelida
Class - Clitellata
Order - Hirudinida
Family - Hirudinidae
Genus - Hirudo
Species - H. medicinalis

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Example of Oligochaeta : Pheretima (earthworm)

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Example of Oligochaeta : Pheretima (earthworm)

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Kingdom - Animalia
Phylum - Annelida
Class - Clitellata
Order -Haplotaxoda
Family - Megascolecidae
Genus - Pheretima
Species - P. posthuma

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Kingdom - Animalia
Phylum - Annelida
Class - Polychaeta
Order -Phyllodocida
Family - Nereididae
Genus - Nereis
Species - N. pelagica

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Class 2 Oligochaeta
(Oligos: few, chaite: hair)

Habitat: mostly terrestrial and few are freshwater

Body metamerically segmented

Clitellum present - near head 14,15,16 segments and form mucus around eggs

Hermaphrodite but cross fertilization occur

Fertilization: external

Cocoon formation occur

Other Examples:  Lumbricus, Tubifex

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Class 1 Polychaeta
(Polys: many; chaite:hair)

Habitat: They are marine, terrestrial, and freshwater.

Bilaterally symmetry, segmented worms.

Archetypical protosome development (schizocoely).

True coelomates (schizocoelomates).

Lateral epidermal setae with each segment.

Dioecious or hermaphroditic.

Fertilization: external

Other Examples: Syllis, Sabella

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Annelida is divided into three classes, which are Polychaeta, Oligochaeta, Hirudinea.

Annelida is invertebrates (no backbone).

Exist in various environments including marine waters, fresh waters and also in moist terrestrial areas.

The body is segmented which is the most distinguishing feature of annelids.

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Have bilateral symmetry

Have a separate mouth and anus

Body composed of ringed segments with specialisation of segments

Bristles always present

Move via peristalsis (contracted, relaxed)

Respiration ; by general body surface

Reproduction: Sexual and gonochoristic or hermaphoditic

Triploblastics (ectoderm, endoderm)

Coelomate (body cavity)

Fertilization can be internal or external.

Digestive system: complete and developed

Circulatory system: Has a true closed circulatory system.

Excretion: by nephridial

Development: direct with no larval stages

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Class 3 Hiradinea
(Hirudo: leech)

Habitat: primarily freshwater annelids but some are marine, terrestrial and parasitic

The body has definite number or segments.

The tentacles, parapodia and setae are totally absent.

They are hermaphrodite.

Fertilization: internal and a larval stage is absent.

Examples: .Hirudinaria (Leech)

always with 34 segments

parasitics or predators

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Which Domain and Kingdom does Annelida belongs to?

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Which Domain and Kingdom does Annelida belongs to?

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Domain - Eukaryote

Kingdom - Animalia

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Syllis vivipara