Chapter 17: Annelids, Clade: Clitellata, Class: Hirudinida - Leeches Flashcards
Most live in what environments?
- freshwater
L> but some are marine or live in moist terrestrial environments
They are more common in what part zones?
- tropics temperate zones
They vary in colour, what four are the most common?
- black, brown, red and olive green
Are most flattened or not flattened?
flattened
Some can be _____ feeding on invertebrates.
Others however can be ____ or ____ parasites.
carnivorous
temporary or permanent
What is their reproductive classification?
hermaphroditic
They only form a ____ during breeding season which secretes a cocoon for reception of eggs.
- clitellum
They usually have a ___ of segments but appear to have ___ due to superficial annuli.
- fixed number
- more
They lack distinct coelomic compartments since they lack __.
- septa
In most, the coelomic cavity is filled with ___ and ___ aka ___.
- connective tissue
- spaces aka lacunae
Lacunae channels serve as what?
- auxiliary circulatory system
They have no setae but did develop __ for attachment.
suckers
The gut is specialized for what?
- storage of large quantities of blood
Most use the suckers to do what?
- attach and inchworm along surface
Not all leeches are parasites most are actually___?
predaceous
Freshwater leeches have a ___ for ingesting small invertebrates as well as to suck blood.
- proboscis
Some terrestrial leeches feed on what three things?
- insect larvae , earthworms and slugs
Other terrestrial leeches climb trees or bushes to reach ____ and give an ex:?
warm bloded vertebrates, baby birds
Most are ___ that prefer tissue fluids and blood pumped from open wounds.
fluid feeders
Some parasitic leeches leave a host during _____ but ___ leeches may remain on the host.
breeding season , fish
Respiration and excretion:
- Some fish leeches have?
- All other leeches gaseous exchange occurs where?
- they have 10-17 pairs of?
- What cells may assist in excretion?
- gills
- across the epidermis
- nephridia
- Coelomocytes
Nervous and Sensory systems:
Two Brains:
- Anterior fused ganglia form a ___ around the __.
- Seven pairs of posterior ___.
- ring, pharynx
- fused ganglia
Nervous and Sensory systems:
There are 21 pairs of _____ in between along a double ___.
- segmental ganglia, double nerve cord
Nervous and Sensory systems:
The epidermis contains ____ and __.
- free sensory nerve endings and photoreceptors
