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Re: [dinosaur] Rods and cones in enantiornithine bird eye from Early Cretaceous Jehol Biota (free pdf)



On 12/29/2017 05:12 PM, Ben Creisler wrote:
> Ben Creisler
> bcreisler@gmail.com
> 
> A new paper in open access:
> 
> 
> Gengo Tanaka, Baochun Zhou, Yunfei Zhang, David J. Siveter & Andrew R.
> Parker (2017)
> Rods and cones in an enantiornithine bird eye from the Early Cretaceous
> Jehol Biota.
> Heliyon 3(1): Article e00479
> doi: 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__doi.org_10.1016_j.heliyon.2017.e00479&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=6U5Q8NklVWyb5SBsTvWkBN0XhsyF3M_CYE3wssUUMmo&s=tdWqty7tjKO3DaRjCq6B1tanvo1BFEAc0E5qZbqM5bo&e=
> https://urldefense.proofpoint.com/v2/url?u=http-3A__www.sciencedirect.com_science_article_pii_S2405844017308587&d=DwIBaQ&c=clK7kQUTWtAVEOVIgvi0NU5BOUHhpN0H8p7CSfnc_gI&r=Ry_mO4IFaUmGof_Yl9MyZgecRCKHn5g4z1CYJgFW9SI&m=6U5Q8NklVWyb5SBsTvWkBN0XhsyF3M_CYE3wssUUMmo&s=Oi-D1bABhJwg5qgyZsPPdTd3idbIPV4wAQcf1hdy8JY&e=
> 
> 
> 
> 
> Extant birds have an extensive spectral range of colour vision among
> vertebrates, but evidence of colour vision among extinct birds has hitherto
> been lacking. An exceptionally well-preserved extinct enantiornithine
> fossil bird from the Early Cretaceous Jiufotang Formation (120 Ma) of
> Liaoning, China, provides the first report of mineralised soft tissue of a
> bird eye. Cone cells are identified, which have preserved oil droplets
> falling between wide ranges of size that can be compared with an extant
> house sparrow. The size distribution of oil droplets of extant birds
> demonstrates good correlation between size and the detectable wavelength
> range of the cone cells: UV-sensitive cones contain the smallest oil
> droplets, while red-sensitive cones possess the largest. The data suggests
> that this Early Cretaceous bird could have possessed colour vision.
> 
> ====
> 
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Great Article! Thanks