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  • Hyper-compound eye in trilobites

    From Pandora@21:1/5 to All on Thu Sep 30 17:04:24 2021
    A 390 million-year-old hyper-compound eye in Devonian phacopid
    trilobites

    Abstract

    Trilobites, extinct arthropods that dominated the faunas of the
    Palaeozoic, since their appearance c 523 million years ago, were
    equipped with elaborate compound eyes. While most of them possessed
    apposition compound eyes (in trilobites called holochroal eyes),
    comparable to the compound eyes of many diurnal crustaceans and
    insects living today, trilobites of the suborder Phacopina developed
    atypical large eyes with wide lenses and wide interspaces in between (schizochroal eyes). Here, we show that these compound eyes are highly sophisticated systems—hyper-compound eyes hiding an individual
    compound eye below each of the big lenses. Thus, each of the phacopid
    compound eyes comprises several tens, in cases even hundreds of small
    compound eye systems composing a single visual surface. We discuss
    their development, phylogenetic position of this hyper-compound eye,
    and its neuronal infrastructure. A hyper-compound eye in this form is
    unique in the animal realm.

    Open access:
    https://www.nature.com/articles/s41598-021-98740-z

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From erik simpson@21:1/5 to Pandora on Thu Sep 30 14:38:39 2021
    On Thursday, September 30, 2021 at 8:04:26 AM UTC-7, Pandora wrote:
    A 390 million-year-old hyper-compound eye in Devonian phacopid
    trilobites

    Abstract

    Trilobites, extinct arthropods that dominated the faunas of the
    Palaeozoic, since their appearance c 523 million years ago, were
    equipped with elaborate compound eyes. While most of them possessed apposition compound eyes (in trilobites called holochroal eyes),
    comparable to the compound eyes of many diurnal crustaceans and
    insects living today, trilobites of the suborder Phacopina developed atypical large eyes with wide lenses and wide interspaces in between (schizochroal eyes). Here, we show that these compound eyes are highly sophisticated systems—hyper-compound eyes hiding an individual
    compound eye below each of the big lenses. Thus, each of the phacopid compound eyes comprises several tens, in cases even hundreds of small compound eye systems composing a single visual surface. We discuss
    their development, phylogenetic position of this hyper-compound eye,
    and its neuronal infrastructure. A hyper-compound eye in this form is
    unique in the animal realm.

    Open access:
    https://www.nature.com/articles/s41598-021-98740-z

    That's neat! I've wondered for some time where the schizochroal eys came from, as
    they seem to be a completely different design from previous trilobites eye. This result that
    the big lens is superposed over the familiar compund eyes, eases that concern. (Easier to modify
    something or add something to existing structures than completely replace.)

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Glenn@21:1/5 to erik simpson on Mon Oct 4 19:33:00 2021
    On Thursday, September 30, 2021 at 2:38:40 PM UTC-7, erik simpson wrote:
    On Thursday, September 30, 2021 at 8:04:26 AM UTC-7, Pandora wrote:
    A 390 million-year-old hyper-compound eye in Devonian phacopid
    trilobites

    Abstract

    Trilobites, extinct arthropods that dominated the faunas of the Palaeozoic, since their appearance c 523 million years ago, were
    equipped with elaborate compound eyes. While most of them possessed apposition compound eyes (in trilobites called holochroal eyes), comparable to the compound eyes of many diurnal crustaceans and
    insects living today, trilobites of the suborder Phacopina developed atypical large eyes with wide lenses and wide interspaces in between (schizochroal eyes). Here, we show that these compound eyes are highly sophisticated systems—hyper-compound eyes hiding an individual
    compound eye below each of the big lenses. Thus, each of the phacopid compound eyes comprises several tens, in cases even hundreds of small compound eye systems composing a single visual surface. We discuss
    their development, phylogenetic position of this hyper-compound eye,
    and its neuronal infrastructure. A hyper-compound eye in this form is unique in the animal realm.

    Open access:
    https://www.nature.com/articles/s41598-021-98740-z
    That's neat! I've wondered for some time where the schizochroal eys came from, as
    they seem to be a completely different design from previous trilobites eye. This result that
    the big lens is superposed over the familiar compund eyes, eases that concern. (Easier to modify
    something or add something to existing structures than completely replace.)

    Yea, you wouldn't want to add something that wasn't attached to an existing structure. But if this is an example of novelty, not modifying existing eyes or replacing them, why would you say that is easier than completely replacing them?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From erik simpson@21:1/5 to Glenn on Mon Oct 4 21:38:09 2021
    On Monday, October 4, 2021 at 7:33:01 PM UTC-7, Glenn wrote:
    On Thursday, September 30, 2021 at 2:38:40 PM UTC-7, erik simpson wrote:
    On Thursday, September 30, 2021 at 8:04:26 AM UTC-7, Pandora wrote:
    A 390 million-year-old hyper-compound eye in Devonian phacopid trilobites

    Abstract

    Trilobites, extinct arthropods that dominated the faunas of the Palaeozoic, since their appearance c 523 million years ago, were equipped with elaborate compound eyes. While most of them possessed apposition compound eyes (in trilobites called holochroal eyes), comparable to the compound eyes of many diurnal crustaceans and
    insects living today, trilobites of the suborder Phacopina developed atypical large eyes with wide lenses and wide interspaces in between (schizochroal eyes). Here, we show that these compound eyes are highly sophisticated systems—hyper-compound eyes hiding an individual compound eye below each of the big lenses. Thus, each of the phacopid compound eyes comprises several tens, in cases even hundreds of small compound eye systems composing a single visual surface. We discuss
    their development, phylogenetic position of this hyper-compound eye,
    and its neuronal infrastructure. A hyper-compound eye in this form is unique in the animal realm.

    Open access:
    https://www.nature.com/articles/s41598-021-98740-z
    That's neat! I've wondered for some time where the schizochroal eys came from, as
    they seem to be a completely different design from previous trilobites eye. This result that
    the big lens is superposed over the familiar compund eyes, eases that concern. (Easier to modify
    something or add something to existing structures than completely replace.)
    Yea, you wouldn't want to add something that wasn't attached to an existing structure. But if this is an example of novelty, not modifying existing eyes or replacing them, why would you say that is easier than completely replacing them?

    Try at least reading the abstract. If you'd like to learn more, try reading the article. (It's open source, at least for now.)

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Glenn@21:1/5 to erik simpson on Tue Oct 5 06:46:58 2021
    On Monday, October 4, 2021 at 9:38:10 PM UTC-7, erik simpson wrote:
    On Monday, October 4, 2021 at 7:33:01 PM UTC-7, Glenn wrote:
    On Thursday, September 30, 2021 at 2:38:40 PM UTC-7, erik simpson wrote:
    On Thursday, September 30, 2021 at 8:04:26 AM UTC-7, Pandora wrote:
    A 390 million-year-old hyper-compound eye in Devonian phacopid trilobites

    Abstract

    Trilobites, extinct arthropods that dominated the faunas of the Palaeozoic, since their appearance c 523 million years ago, were equipped with elaborate compound eyes. While most of them possessed apposition compound eyes (in trilobites called holochroal eyes), comparable to the compound eyes of many diurnal crustaceans and insects living today, trilobites of the suborder Phacopina developed atypical large eyes with wide lenses and wide interspaces in between (schizochroal eyes). Here, we show that these compound eyes are highly sophisticated systems—hyper-compound eyes hiding an individual compound eye below each of the big lenses. Thus, each of the phacopid compound eyes comprises several tens, in cases even hundreds of small compound eye systems composing a single visual surface. We discuss their development, phylogenetic position of this hyper-compound eye, and its neuronal infrastructure. A hyper-compound eye in this form is unique in the animal realm.

    Open access:
    https://www.nature.com/articles/s41598-021-98740-z
    That's neat! I've wondered for some time where the schizochroal eys came from, as
    they seem to be a completely different design from previous trilobites eye. This result that
    the big lens is superposed over the familiar compund eyes, eases that concern. (Easier to modify
    something or add something to existing structures than completely replace.)
    Yea, you wouldn't want to add something that wasn't attached to an existing structure. But if this is an example of novelty, not modifying existing eyes or replacing them, why would you say that is easier than completely replacing them?
    Try at least reading the abstract. If you'd like to learn more, try reading the article. (It's open source, at least for now.)

    Why, did you write that too?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)