صفحه 1:
Annelida.ppt
08 Sept. 2014
صفحه 2:
Phylum Annelida
“segmented worms”
08 Sept. 2014 Annelida.ppt
صفحه 3:
Phylum Annelida
¢ Phylum Annelida
* Latin “ringed” analogy to tree annual
rings
~ 9000 species
* Body plan
*Tube-in-tube, Protostomous
*Bilateral symmetry
*Coelomate, “split” coelom
٠ Marine, aquatic, terrestrial
08 Sept. 2014 Annelida.ppt
صفحه 4:
Phylum Annelida
¢ Tissues and organs differentiated
* Segmentation highly developed
٠ Mesodermal “blocks,” each with own coelom
+ Septa between segments
Coelom in each segment
epidermis (ectoderm)
‘mesodermal tissue
gt lining, (encloderm)
08 Sept. 2014 Annelida.ppt
صفحه 5:
Phylum Annelida
¢ Hydrostatic skeleton
+ Fluid pressure in coelom provides support &
locomotion
* Circular muscles
+ Longitudinal muscles
+ Peristgiss ae
08 Sept. 2014 Annelida.ppt
صفحه 6:
Function of a hydrostatic skeleton
تور
08 Sept. 2014 Annelida.ppt 6
صفحه 7:
Phylum Annelida
¢ Setae (“bristles”) of chitin
* “anchors” for earthworm
* “paddles” for polychaete
- Enlarged as jaws in leeches, some polychaetes
08 Sept. 2014 Annelida.ppt
صفحه 8:
Animal Life
* Ways the needs of cells are
met
* Food
* O, and CO, exchange
* Across epidermis, some have
“gills”
* Waste removal
* Metanephridia in each segment
08 Sept. 2014 Annelida.ppt
صفحه 9:
Phylum Annelida
* Special concerns of a multicellular
animal
* Circulation closed
* Coordination: Nervous system with paired ventral
cords
+ Structural support: Hydrostatic
* Movement: Hydrostatic
+ Maintenance of water balance: Segmental
metanephridia.
* Reproduction
* Usually sexual, sexes separate or hermaphroditic
08 Sept. 2014 Annelida.ppt
صفحه 10:
Phylum Annelida
* Closed circulatory
system
+ Multiple “hearts”
٠ Hemoglobin
* notin blood cells
* reddish-pink color,
08 Sept. 2014 Annelida.ppt 10
صفحه 11:
Phylum Annelida
Annelid Nervous System
* Central nervous
system 55
* Dorsal brain و
+ Pair of nerves on sides
segmental ganglion
of esophagus
+ Paired ventral nerve تست es
cords with paired
ganglia in each septum
segment
+ Transverse nerves
connect ganglia in
each segment
08 Sept. 2014 Annelida.ppt 11
صفحه 12:
Phylum Annelida
¢ Earthworms’
paired nerve cords
are fused into
single ventral cord 25
٠ Arthropod better Coppa © 2005 Pearson Prenie Hal,
illustrates
primitive nervous
system of both
phyla.
Brain
Nerve Malpighian Intestine Genital
cord tubules opening
08 Sept. 2014 Annelida.ppt 12
صفحه 13:
Phylum Annelida
* Metanephridia Epidermis
for excretion of
metabolic waste
products
Longitudinal
muscle
Dorsal
blood
vessel
_Nerve cord
08 Sept. 2014 Annelida.ppt 13
صفحه 14:
Phylum Annelida
» “Class Polychaeta”
* Mostly marine, very
diverse (polyphyletic )
* “many setae,” clusters
with 20+ setae
* parapodia
08 Sept. 2014 Annelida.ppt 14
صفحه 15:
Phylum Annelida
> Superclass Errantia 10
* Mostly marine, diverse
active swimmers,
predators
* “many setae,” clusters
with 20+ setae
* parapodia
08 Sept. 2014 Annelida.ppt 15
صفحه 16:
Phylum Annelida
> Superclass
Sedentaria
* Mostly marine,
sedentary tube
builders, filter
feeders
* Class (?) marine
tube worms Me,
* Class (?) Clitellata
* With clitellum
08 Sept. 2014 Annelida.ppt 16
صفحه 17:
Phylum Annelida
» Class (?) Clitellata
* Clitellum
¢ Aquatic & terrestrial
» Subclass (?)
Oligochaeta
* Few setae in
clusters per s
08 Sept. 2014 Annelida.ppt 17
صفحه 18:
18
Phylum Annelida
» Subclass (?)
Hirudinea
+ pair of bladelike
“Jaws”
* posterior “suction
cup”
* Predators
+ External parasites,
“bloodsuckers”
* Secrete
anticoagulants
* Medicinal use
08 Sept. 2014 Annelida.ppt
صفحه 19:
Phylum Annelida
x
» Class Hirudinea coe
* Hirudin from 36
leech, Hirudo تا =a
medicinalis, 2 __ hirudin from leech
inhibits blood [Prothrombin (i): 5
clotting " ay
“Fibrinogen @) | xi
" H. medicinalis, 0 OC a vg
registered as
“medical device.” ae
{fibrin polymer
08 Sept. 2014 Annelida.ppt 19