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stemma

stemma

9.9
A small simple eye with one lens that detects light but not clear images
  • noun
  • /ˈstɛmə/
  • Specialized
translation icon : estemma
  • Unlike compound eyes, a stemma has only a single simple lens.

Examples

  • The larval stages of many insects possess a stemma on each side of the head.

  • Each stemma is capable of detecting light but not detailed images.

  • The insect has a single stemma on its head.

  • Some species of insects possess multiple stemmata.

  • The larval stages of many insects develop a stemma that helps them sense their environment.

  • Each stemma in certain arthropods can only detect light intensity, not shapes or colors.

  • Insects like moths typically possess a stemma on either side of their heads for light detection.

Synonyms

simple eye
vsstemma
  • Specialized
1 7.0

A part of an insect or spider body with one lens that helps it see

is used mainly for certain insects and arthropods rather than broadly
ocellus
vsstemma
  • Specialized
9.9

A simple eye with one lens that detects light on many insects and jellyfish

focuses on occurrence mainly in certain insects and arthropods

Surface Forms

stemma singular
stemmas plural

Etymology

Stemma comes from an old Greek word stemma meaning 'wreath' or 'garland', and a helpful way to remember the insect sense is to think of the small round spots on a bug's head like tiny rings. So, a stemma in insects is a simple, single-lens eye — a small spot rather than a full compound eye.