digsrocks73 Posted February 20, 2019 Share Posted February 20, 2019 Bought this trilobite many yrs. ago there was no info on it at all but the eyes were so great I had to have it, I am pretty sure its a Order Phacopida but that's as far as I have gone. Family, Genus and species have a dead end in my searching, Not a super piece and am sure some it is missing some of the front of the cephalon which adds to the ID but would like to display it with correct ID. Any help would be appreciated. Link to comment Share on other sites More sharing options...
gigantoraptor Posted February 20, 2019 Share Posted February 20, 2019 Eldredgeia sp. from Bolivia? There are a couple of locations where these occur inside the country if I'm not mistaken. Try Eldredgeia venustus. Could you take a picture of the eyes ( lenses) please? 2 Link to comment Share on other sites More sharing options...
digsrocks73 Posted February 20, 2019 Author Share Posted February 20, 2019 1 Link to comment Share on other sites More sharing options...
digsrocks73 Posted February 20, 2019 Author Share Posted February 20, 2019 54 minutes ago, gigantoraptor said: Eldredgeia sp. from Bolivia? There are a couple of locations where these occur inside the country if I'm not mistaken. Try Eldredgeia venustus. Could you take a picture of the eyes ( lenses) please? This is the best I could get with my Paleo era floppy disc camera. Your ID is helpful as I did find the following info that pretty much matches the trilobite. Eldredgeops, below. Superfamily Phacopoidea Cephalon: generally with strongly divergent axial furrows (glabella greatly expanding anteriorly), anterior glabellar lobes fused into single anterior tri-composite lobe, frontal area generally lacking (obliterated by large glabella), eyes (when present) typically anterior; genal angle typically rounded, without genal spines (exceptions among Pterygometopidae), vincular furrow generally present. Thorax: variable, but often with rounded tips. Pygidium: typically micropygous (Phacopidae) to subisopygous (some Pterygometopidae), not spinose. Families: Phacopidae, Pterygometopidae Genera: Phacopidae: Acernaspis (=Eskaspis; =Otadenus; =Murphycops), Acuticryphops, Adastocephalum, Afrops, Ainasuella, Altaesajania, Ananaspis, Angulophacops, Arduennops, Atopophacops, Babinops, Boeckops, Burtonops, Chotecops (=Cordapeltis), Cryphops (/Gortania/Microphthalmus), Cultrops, Denckmannites (/Denckmannia), Dianops, Dienstina, Drotops, Ductina, Echidnops, Echinophacops, Eldredgeops, 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 20, 2019 Share Posted February 20, 2019 Can we get a picture showing the pygidium (Tail shield)? I agree it looks like it could be Eldredgia venustus from Bolivia. 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
gigantoraptor Posted February 20, 2019 Share Posted February 20, 2019 4 minutes ago, digsrocks73 said: This is the best I could get with my Paleo era floppy disc camera. Your ID is helpful as I did find the following info that pretty much matches the trilobite. Eldredgeops, below. I still think it's Eldredgeia venustus, since Eldredgeops is not from South-America. Link to comment Share on other sites More sharing options...
piranha Posted February 20, 2019 Share Posted February 20, 2019 Eldredgeops is in the Phacopidae and Eldredgeia is in the Calmoniidae. The most notable difference are the glabellar lobes which are absent on Eldredgeops. This example conforms with the diagnosis of E. venustus with up to 8-9 lenses per lens file. 2 Link to comment Share on other sites More sharing options...
digsrocks73 Posted February 20, 2019 Author Share Posted February 20, 2019 I believe there are segments missing from the end of the pygidium which don't help but the eyes were worth $2,00 Thanks for the help. I like my records of each trilobite to be complete as possible. Link to comment Share on other sites More sharing options...
digsrocks73 Posted February 20, 2019 Author Share Posted February 20, 2019 So with the eye lens file count on this one at 8 and the glabellar lobes what would be the Family, Sub family and genus be. And I thought Asaphus was confusing. Link to comment Share on other sites More sharing options...
minnbuckeye Posted February 20, 2019 Share Posted February 20, 2019 1 hour ago, piranha said: up to 8-9 lenses per lens file Can someone explain the meaning of this? I looked the eye over carefully in an attempt to answer my question but failed. Link to comment Share on other sites More sharing options...
digsrocks73 Posted February 21, 2019 Author Share Posted February 21, 2019 Link to comment Share on other sites More sharing options...
piranha Posted February 21, 2019 Share Posted February 21, 2019 1 hour ago, digsrocks73 said: So with the eye lens file count on this one at 8 and the glabellar lobes what would be the Family, Sub family and genus be. One file also has 9 lenses. Family Calmoniidae: Subfamily Calmoniinae: Eldredgeia venustus 1 Link to comment Share on other sites More sharing options...
digsrocks73 Posted February 21, 2019 Author Share Posted February 21, 2019 Thank you so much. First time I have been stumped this bad. Now I need a Eldredgeops. One file with 9 lenses on this one, berth defect here I guess. Link to comment Share on other sites More sharing options...
piranha Posted February 21, 2019 Share Posted February 21, 2019 15 minutes ago, digsrocks73 said: One file with 9 lenses on this one, berth defect here I guess. There is nothing unusual, it fits the diagnosis perfectly: maximum up to 8-9 lenses per file. "Bolivian Eldredgeia venustus (Wolfart, 1968) typically has 26-27 dorsoventral files on each eye with a maximum of eight to nine lenses/file." Lieberman, B.S. 1993 Systematics and the biogeography of the "Metacryphaeus Group" Calmoniidae (Trilobita, Devonian), with comments on adaptive radiations and the geological history of the Malvinokaffric Realm. Journal of Paleontology, 67(4):549-570 1 Link to comment Share on other sites More sharing options...
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