annelida…the earthworm! phylum - class - family - genus - species - annelida oligochaeta...
TRANSCRIPT
ANNELIDA…The EARTHWORM!
Phylum -Class -
Family -Genus -Species
-
AnnelidaOligochae
taLumbricid
aeLumbricu
sterrestris
PartPart
ProstromiumProstromium
MouthMouth
BrainBrain
PharynxPharynx
EsophagusEsophagus
HeartsHearts
Seminal receptacleSeminal receptacle
Seminal vesiclesSeminal vesicles
FunctionFunction
Digs dirtDigs dirt
Food enters hereFood enters here
Sends/receives nerve Sends/receives nerve messagesmessages
Pushes food alongPushes food along
Brings food to intestineBrings food to intestine
Pumps bloodPumps blood
Holds sperm from another Holds sperm from another wormworm
Makes spermMakes sperm
SystemSystem
DigestiveDigestive
DigestiveDigestive
NervousNervous
DigestiveDigestive
DigestiveDigestive
CirculatoryCirculatory
ReproductiveReproductive
ReproductiveReproductive
PartPart
CropCrop
GizzardGizzard
KidneyKidney
IntestineIntestine
Dorsal Blood VesselDorsal Blood Vessel
Ventral Blood VesselVentral Blood Vessel
Ventral NerveVentral Nerve
ClitellumClitellum
OvariesOvaries
FunctionFunction
Stores foodStores food
Grinding foodGrinding food
Filters blood (wastes)Filters blood (wastes)
Absorbs food into blood Absorbs food into blood (long)(long)
Brings blood forwardBrings blood forward
Blood to posterior Blood to posterior
Connects brain to bodyConnects brain to body
Band making slime to Band making slime to hold eggshold eggs
Make eggsMake eggs
SystemSystem
DigestiveDigestive
DigestiveDigestive
CirculatoryCirculatory
DigestiveDigestive
CirculatoryCirculatory
CirculatoryCirculatory
NervousNervous
ReproductiveReproductive
ReproductiveReproductive
PartPart
SetaeSetae
CuticleCuticle
NephridiumNephridium
FunctionFunction
Bristles for hold in Bristles for hold in burrowburrow
Skin-used to Skin-used to breathe (water)breathe (water)
Removes Liquid Removes Liquid WasteWaste
SystemSystem
MovementMovement
RespirationRespiration
ExcretoryExcretory
Sugar maple forest before earthworm invasion
After earthworm invasionhttp://www.nrri.umn.edu/worms/forest/index.html
3 ecological groups of earthworms
Epigeic example: Lumbricus rubellus (leaf worms)
Endogeic example: Aporrectodea caliginosa (angle worms)
Anecic : Lumbricus terrestris nightcrawlers
7
Body Structure: Coelom
Phylum Annelida8
Digestive System
Phylum Annelida10
Circulatory System Continuous network of
vessels; 5 muscular aortic arches
Dorsal blood-Aortic Arches-Ventral blood
Blood contains hemoglobin, which increases oxygen carrying ability
Phylum Annelida12
Excretory & Nervous System
Nervous system
Phylum Annelida13
Reproduction• Hermaphrodites
• Eggs are produced when two earthworms inseminate each other during mating.
• There are two male openings, and two pairs of small sacs, the sperm receptacles. During mating, these receive sperm from the other partner.
• The eggs, formed in a pair of ovaries, are released from the oviducts into one of two tiny pores
Reproduction continued
• Fertilization can be internal or external
• Breeding is usually seasonal (spring or fall)
• Mating occurs usually when the ground is wet following rain. Earthworms may emerge and travel over the surface of the ground before they mate
Reproduction continued….• The two worms join the lower surfaces of
their anterior ends, with heads pointing in opposite directions. Mucous is secreted until each worm is enclosed in a tube of slime.
• The worms then separate and egg-laying and fertilization occur later.
• Egg-laying starts when the gland cells of the clitellum secrete a mucous ring that is moved forward over the body of the worm
Reproduction continued….
A Worm is Born• Egg cocoons are
deposited in the soil.
• The fertilized eggs develop directly into young worms, which then escape through the egg membrane and an Annelid is born!
Worm Anatomy
External Anatomy:
Internal Anatomy
Please have your Earthworm colorfun and lab on your desk
EXTERNAL Dorsal Anterior Mouth Ventral Posterior Clitellum Setae
INTERNALPharynxEsophagusCropGizzardIntestineDorsal BVAortic archesVentral BVSeminal vesiclesVentral nerve cord
Review your colorfun and be ready to dissect tomorrow!