Assertion: tissue's structure | /r/HasProperty | no tapetum
Facets:
Source sentences:
text: Primitive type (e.g. Mesothelae, Orthognatha) - a simple sheet behind the retina Canoe-shape type (e.g. Araneidae, Theridiidae) - two lateral walls separated by a gap for the nerve fibres Grated type (e.g. Lycosidae, Pisauridae) - a relatively complex, grill-shaped structure No tapetum (e.g. Salticidae)