kauffy Posted February 21, 2008 Share Posted February 21, 2008 Another missisipian fossil from Bloomington IN Its the only crinoid Head i found nearly complete, does anyone have an identification? Thanks a lot! its 1cm long "Turn the fear of the unknown into the excitment of possibility!"We dont stop playing because we grow old, we grow old because we stop playing. Link to comment Share on other sites More sharing options...
Guest N.AL.hunter Posted February 21, 2008 Share Posted February 21, 2008 It does look like a blastoid, I don't know species, but blastoids are not crinoids. Link to comment Share on other sites More sharing options...
kauffy Posted February 21, 2008 Author Share Posted February 21, 2008 really!? well i guess you learn something every day! ha! thanks "Turn the fear of the unknown into the excitment of possibility!"We dont stop playing because we grow old, we grow old because we stop playing. Link to comment Share on other sites More sharing options...
Shuko Posted February 21, 2008 Share Posted February 21, 2008 really!?well i guess you learn something every day! ha! thanks They're both in the same class though, right? They're both kinds of Echinoids, I think. Link to comment Share on other sites More sharing options...
Guest N.AL.hunter Posted February 21, 2008 Share Posted February 21, 2008 Yes, they are both echinoids as are starfish, sand dollars, sea biscuits, and everything else with penta-radial symetry. I think that is their body plan type. Could be wrong on that point. Link to comment Share on other sites More sharing options...
Guest Nicholas Posted February 21, 2008 Share Posted February 21, 2008 Definately a blastoid in my opinion, I don't know much about them though I'm afraid. Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted February 21, 2008 Share Posted February 21, 2008 They're both in the same class though, right? They're both kinds of Echinoids, I think. They are both echinoderms, but they are separate classes, as are the echinoids. Link to comment Share on other sites More sharing options...
jkfoam Posted February 21, 2008 Share Posted February 21, 2008 Blastoids are the common name for the Class Blastoidea Crinoids are the common name for the Class Crinoidea Echinoids are the common name for the Class Echinoidea Cystoids are the comm0n name for the Class Cystoidea Edrioasteroids are the common name for the class Edrioasteroidea All are Classes of the Phylum Echinodermata (There are several more Classes in the Phylum I did not list. My book lists 12 Classes). JKFoam The Eocene is my favorite Link to comment Share on other sites More sharing options...
Members geofossil Posted February 21, 2008 Members Share Posted February 21, 2008 Blastoids are the common name for the Class BlastoideaCrinoids are the common name for the Class Crinoidea Echinoids are the common name for the Class Echinoidea Cystoids are the comm0n name for the Class Cystoidea Edrioasteroids are the common name for the class Edrioasteroidea All are Classes of the Phylum Echinodermata (There are several more Classes in the Phylum I did not list. My book lists 12 Classes). JKFoam True. One way to look at it is blastoids having the same relationship to crinoids as mammals have to reptiles. Blastoids are fairly common in Lower Carboniferous (Missisippian) deposits in some Alberta Rocky Mountain formations. What is often referred to as 'crinoidal rock' is often as much blastoid stems and other echinodermata as crinoids thenmselves. Here's afew of my specimens. all of these are Lower Carboniferous. I'm too lazy to write all the species but the genera are Pentremities, Cryptoblastus, Diploblastus and a few others. they range from .4 to 3cm in size. Link to comment Share on other sites More sharing options...
Gatorman Posted February 21, 2008 Share Posted February 21, 2008 Cool! I like Blastoids Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted February 22, 2008 Share Posted February 22, 2008 a little off topic, but where is the love for the cystoids? Link to comment Share on other sites More sharing options...
Members geofossil Posted February 22, 2008 Members Share Posted February 22, 2008 a little off topic, but where is the love for the cystoids? If they weren't so small, i'd give them a big hug. Cystoids are a bit of a quirky group. Not much consensus what a 'cystoid' actually is or who gets to be included. Some odds and ends are sometimes tossed in with cystoids under ' 'Cystoidea incertae sedis' because they don't fit crinoids, blastoids, etc. An example is the Ordovician genus 'Bolboporites sp.' (below) These are .5 cm or so Link to comment Share on other sites More sharing options...
Roz Posted February 22, 2008 Share Posted February 22, 2008 Those almost look like a type of seed cone, geofossil. I found a few cystoids in IL but thought they were blastoids at the time. Welcome to the forum! Link to comment Share on other sites More sharing options...
Members geofossil Posted February 22, 2008 Members Share Posted February 22, 2008 Those almost look like a type of seed cone, geofossil.I found a few cystoids in IL but thought they were blastoids at the time. Bolboporites is a fairly common Ordovician echinodermata. Although some taxa in the phylum are hard to place, they are easy to put in echinodermata because of the arrangment of the calcite plates. Re your cystoids. They can be difficult to distinguish from some blastoids if there isn't a lot of external detail. Some blastoids don't have the characteristic olive or pumpkin shape. Link to comment Share on other sites More sharing options...
Roz Posted February 22, 2008 Share Posted February 22, 2008 Well, I maybe wrong, maybe they are all blastoids then? I thought the one on the left could be a cystoid. Theses were found in northwestern Illinois, so think they would be the same age as Kauffy's (maybe older, not sure). The blastoids south in the state look like the ones you posted, geofossil. I would have posted this under ID's but seems to make more sense here. Welcome to the forum! Link to comment Share on other sites More sharing options...
Guest N.AL.hunter Posted February 22, 2008 Share Posted February 22, 2008 None of these look like blastoids to me. Perhaps bottom of crinoid calyx and some other stuff, but I find blastoids by the hundred and these in the last pic don't resemble any I find. Link to comment Share on other sites More sharing options...
kauffy Posted February 22, 2008 Author Share Posted February 22, 2008 wow lots of very good information, geofossil those Blastoids of yours are incredible! does anyone think its possible to get a species name of my blastoid....its small, about 1cm and everyone elses seem to be much much larger??! Thanks "Turn the fear of the unknown into the excitment of possibility!"We dont stop playing because we grow old, we grow old because we stop playing. Link to comment Share on other sites More sharing options...
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