Assertion: spider's pattern | /r/HasProperty | unique
Facets:
value: among arthropods
type: OTHER
Source sentences:
text: The pattern of segment fusion that forms chelicerates' heads is unique among arthropods, and what would normally be the first head segment disappears at an early stage of development, so that chelicerates lack the antennae typical of most arthropods.
text: Each spider has a unique pattern, and the patterns differ from island to island.