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AGNATHA

Cameron Geddes BIOL 204 English

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AGNATHA

SKELETAL SYSTEM
- AXIAL SKELETON
  - VERTEBRAE
    - most support is from notochord
    - absent in myxinoidea
    - petromyzontida have small cartilaginous neural arches
- SKULL
  - SPLANCHNOCRANIUM
    - paleostylic jaw suspension
      - all arches support the gills
    - cartilaginous
  - CHONDROCRANIUM
    - cartilaginous
    - encases the brain
INTEGUMENT
- EPIDERMIS
  - keratinized epidermal spines for grasping food
  - covered by mucus cuticle
  - unicellular mucus and toxin glands
  - myxinoidea have multicellular slime glands that coat gills of potential predators
- DERMIS
DIGESTIVE SYSTEM
- BUCCAL CAVITY
- PHARYNX
  - gill rakers trap food particles
- ALIMENTARY CANAL
RESPIRATORY SYSTEM
CIRCULATORY SYSTEM
- HEART
  - Petromyzontida have bulbus arteriosus
  - Myxinoidea have two hearts
    - Branchial heart: sinus venosus, atrium, ventricle. Pumps blood through ventral aorta to gills
    - Portal heart: pumps blood through hepatic portal vein to liver
- VESSELS
  - all 6 aortic arches supply the gills with blood
NERVOUS SYSTEM
MUSCULAR SYSTEM
- BRANCHIOMERIC
  - muscular pharyngeal pump pumps water over gills
- HYPOBRANCHIAL
- AXIAL
- APPENDICULAR
URINARY SYSTEM
- NEPHRONS
- OSMOREGULATION
  - myxinoidea are osmoconformers - do not need to osmoregulate
- GLANDS

Description: BIOL 204 Mind Map on AGNATHA, created by Cameron Geddes on 12/04/2018.
Created by: Cameron Geddes
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