Phylum Annelida Flashcards
Classification Of Annelida
Polychaeta
Oligochaeta
Hirudinea
Characteristics Of Annelida
In terms of coelom
In terms of symmetry & body symmetry
In terms of body segments
In terms of skeleton
In terms of cuticle
In terms of individual segments
They have a good and well developed coelom
They are bilaterally symmetrical & body is metamerically segments
The body is made of series of ring-like segments
Coelomic fluid supports turgidity and functions as hydrostatic skeleton
It has a thick cuticle secreted by the epithelium
Each segment bear cheatae/setae
Characteristics Of Annelides
In terms of digestion
In terms of circulatory system
In terms of body wall
In terms of oral segment
In terms of each segment
What is a septa..?
Digestive system is complete (straight, not metamerically segmented and with a terminal anus)
It possesses a dorsal closed circulatory system (which carries blood from one segment to another)
Its body wall has outer circular and inner longitudinal muscle layers
Presence of a single pre oral segment called the Prostomium
Each segment bears bristle-like chaetae/setae
Septa: It serves as a partition by separating each segment internally
Characteristics Of Phylum Annelida
In terms of respiration
In terms of digestion tracts
In terms of reproduction
In terms of movement
In terms of sexes & larvae
In terms of excretion
Respiratory gas exchange through skin, gills or parapodia
The tube that makes up the digestive tract had several portions (the pharynx, esophagus, crop, gizzard and intestine)
Asexual reproduction occurs by fragmentation
Movement is by contraction of circular muscles running around each segments
Sexes may or may not he different (separate) & larvae type; if present are trochophore [small, translucent, free-swimming]
Excretory system is a pair of nephridia for each body segment(for excretion & osmoregulation)
Types of skeleton
Hydrostatic
Exoskeleton
Endoskeleton
Phylum Annelida
They are diverse group of …. characterized by …
They are commonly called …
They range in length from … to …
They occur in the …
Some examples: ….
They are diverse group of coelomate animals characterized by serial segmentation
They are commonly called Segmented or Ringed Worms
They range in length from 0.5mm to 3m
They occur in the sea, freshwater, marine, damp soil and land
Some examples: Ragworm, Earthworm, Polychaetes
Economic Importance Of Annelids
In terms of decomposition
In terms of soil activities
In terms of parasitism
In terms of medicinal use
Earthworm are scavengers on decomposing organic matter
They can ingest their own weight in soil everyday, this aids the act of aerating the soil thereby making nutrients available to plants by mixing the sub-soil with the top soil.
Parasitic leeches suck blood of larger animals
Doctors use medicinal leeches to bleed patients for centuries now but today, surgeons use them to drain excess fluid from tissues after reconstructive surgery thereby reducing swelling
