Having compound lenses, each with separate cornea, each lens separated from others by shallow scleral walls; corneal membrane ends at lens edge

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  • Holochroal eye — Holochroal eyes are compound eyes with a many (sometimes over 15,000) tiny lenses (30 100μm, rarely larger).Citation | last1 = Clarkson | first1 = E. N. K. | year=1979 | title =The Visual System of Trilobites.| journal =Palaeontology |volume= 22… …   Wikipedia

  • holochroal — adj. [Gr. holos, whole; chroa, body surface] (ARTHROPODA) Refers to a compound eye with narrow facets and polygonal lenses, as in most crustacean and insect eyes; see schizochroal …   Dictionary of invertebrate zoology

  • holochroal — ho·loch·ro·al …   English syllables

  • holochroal — həˈläkrəwəl adjective Etymology: hol + Greek chrōs skin, color + English al more at grit : having compound eyes with the visual area covered by a continuous cornea used especially of certain trilobites …   Useful english dictionary

  • Trilobite — ] Highly complex compound eyes are another obvious feature of the cephalon (see below). Figure 3 shows gross morphology of the cephalon. The cheeks (genae) are the pleural lobes on each side of the axial feature, the glabella. When trilobites… …   Wikipedia

  • Phacopida — Taxobox name = Phacopida fossil range = Ordovician Devonian image width = 240px image caption = Dalmanites limulurus , a trilobite of the suborder Phacopina regnum = Animalia phylum = Arthropoda classis = Trilobita ordo = Phacopida ordo authority …   Wikipedia

  • Proetida — Taxobox name = Proetida fossil range = Ordovician Permian image width = 240px image caption = Devonian Cyphaspis tafilalet trilobites of the superfamily Aulacopleuroidea regnum = Animalia phylum = Arthropoda classis = Trilobita subclassis =… …   Wikipedia

  • Arthropod eye — Anatomy of the compound eye of an insect The arthropods ancestrally possessed compound eyes, but the type and origin of this eye varies between groups, and some taxa have secondarily developed simple eyes. The organ s development through the… …   Wikipedia

  • schizochroal — n. [Gr. schizien, to split; chroa, superficial appearance] (ARTHROPODA: Trilobita) Bound isolated lenses that form around semicircular facets; see holochroal …   Dictionary of invertebrate zoology

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