


Obelia
(polyps and gonangia)

Trichinella
circle: cyst / cyst wall
arrow: skeletal muscle


Taenia
red circle: scolex
red square: immature proglottids
green arrows: suckers
blue arrow: hooks


Spicules

Hydra
blue circle: bud
blue square: spermary
green circle: mouth
green square: tentacles

Planaria
circle: eyespots
arrow: gastrovascular cavity
(+ mouth and pharynx)

Chlonorchis
blue circle: oral sucker
green arrows: intestines
blue square: ventral sucker
blue arrow: uterus
green circle: testes


Bone
green circle: central (osteonic) canal
blue circle: osteon
blue arow: matrix
green arrow: osteocyte in lacuna

Sperm
arrow: flagellum
circle: sperm cell