Phylum Annelida

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Information about Phylum Annelida
Education

Published on January 5, 2009

Author: erinNly

Source: slideshare.net

PHYLUM ANNELIDA

ANNELIDA=> “ segmented worms” often hermaphroditic True coelom Digestive tract

“ segmented worms”

often hermaphroditic

True coelom

Digestive tract

ANNELIDA=> most marine species in class: Polychaeta either free-swimming or “fanworms”

most marine species in class: Polychaeta

either free-swimming or “fanworms”

ANNELIDA=> fanworms are tube-dwellers that have tentacles for filter-feeding

fanworms are tube-dwellers that have tentacles for filter-feeding

“ Christmas Tree” worms

ANNELIDA=> free-swimming annelids have a pair of parapodia on each segment usually powerful, pincherlike jaws: (sandworms & clamworms)

free-swimming annelids have a pair of parapodia on each segment

usually powerful, pincherlike jaws: (sandworms & clamworms)

ANNELIDA - “fireworm”

ANNELIDA - “clamworm”

The EARTHWORM: Class: Oligochaeta

Class: Oligochaeta

 

The EARTHWORM: MOVEMENT: 1) posterior setae anchor 2) circular muscles contract 3) anterior setae anchor 4) circular muscles relax and longitudinal muscles contract *muscles contract against “hydrostatic skeleton”

MOVEMENT:

1) posterior setae anchor

2) circular muscles contract

3) anterior setae anchor

4) circular muscles relax and longitudinal muscles contract

*muscles contract against “hydrostatic skeleton”

 

The EARTHWORM: EXCRETION: NEPHRIDIA - long tubules that excrete liquid waste

EXCRETION:

NEPHRIDIA - long tubules that excrete liquid waste

The EARTHWORM: DIGESTION: “ MOUTH” (opening) PHARYNX (acts as a soil pump) CROP (temp. storage organ) GIZZARD (grinds up soil) INTESTINE (nutrients are absorbed) ANUS (exit)

DIGESTION:

“ MOUTH” (opening)

PHARYNX (acts as a soil pump)

CROP (temp. storage organ)

GIZZARD (grinds up soil)

INTESTINE (nutrients are absorbed)

ANUS (exit)

The EARTHWORM:

 

The EARTHWORM: RESPIRATION & CIRCULATION: no special resp. structures breathe through moist skin blood flows from anterior (ventral blood vessel) to posterior (dorsal blood vessel) AORTIC ARCHES - 5 pairs of muscular vessels at ant. end “hearts”

RESPIRATION & CIRCULATION:

no special resp. structures

breathe through moist skin

blood flows from anterior (ventral blood vessel) to posterior (dorsal blood vessel)

AORTIC ARCHES - 5 pairs of muscular vessels at ant. end “hearts”

 

 

The EARTHWORM: RESPONSE: small “brain” of fused GANGLIA ventral nerve cord poor sensory organs

RESPONSE:

small “brain” of fused GANGLIA

ventral nerve cord

poor sensory organs

The EARTHWORM: REPRODUCTION: are hermaphrodites cannot fertilize own eggs young hatch in 2 - 3 weeks

REPRODUCTION:

are hermaphrodites

cannot fertilize own eggs

young hatch in 2 - 3 weeks

LEECHES: Class: Hirudinea have no setae nor parapodia most are parasites most dwell in fresh water

Class: Hirudinea

have no setae nor parapodia

most are parasites

most dwell in fresh water

LEECHES: Class: Hirudinea one pair suckers muscular pharynx w/ razor-sharp teeth anti-coagulant & pain-numbing saliva

Class: Hirudinea

one pair suckers

muscular pharynx w/ razor-sharp teeth

anti-coagulant & pain-numbing saliva

 

 

 

 

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