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Dpaul7

Coral Question - Rugosa or Tabulata?

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Dpaul7

Hi!

 

I just received a couple nice works on Fossils.  In Index Fossils of North America (1959) I see Pycnostylus (Fletcheria) listed as a Tabulate!  (Subclass Schizocoralla) (Whitleaves 1884)

Fossilworks lists subclass Rugosa

fosillid shows the following:

Hill, 1981. Rugosa and Tabulata

Ivanovskiy, 1965. Fossil Rugosa

 

Wow!  What a way to confuse a newbie!  My specimens I found match the illustrations and descriptions in Index Fossils, I am happy to say.

It must be the German in me, but I go nuts for accurate taxonomy (when I can get it).  How can this change?  How can it be BOTH rugosa and tabulata?  Can it?  I know some things change with further research.... but THIS should be fairly elementary!!??!!

 

:headscratch:I know the index is older... but I would not think THIS would change much up to today!  Species, yes. Even genus, perhaps.  But subclass?

Sorry if I'm a bit confused!  Hoping someone can shed some light on this!

 

David Ruckser

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TqB

Pycnostylus is rugosa.

 

Fletcheria is allowed its own generic status in Hill 1981 (the Treatise actually). It's placed in rugosa but with a note that it's just possibly tabulate, an auloporid.

The septa are very short, like a lot of the septal ridges you get in some tabulates. At the time, she said that more study was required to confirm its status, I don't know if that's been done yet.

Here's the entry:

 

IMG_2999.thumb.jpg.e4bff13c5c32004352db841d00ccaa23.jpgIMG_3000.thumb.jpg.37353040e815a3832437f7280aeda65c.jpg

 

 

 

 

 

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Dpaul7

Thank you for the reply!  I had suspected this might be the case here.  I tend to think of it (based on our specimens) as a colonial Rugose...but thought perhaps the experts were not yet totally clear on the matter! My book The Rugose Coral Genera (1973) gives the following (see attached picture) -

rugose.jpg

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TqB

If yours are definitely Pycnostylus then they're clearly rugose.

 

In Hill (1981) (who is generally excellent), Fletcheria is only listed from the Silurian of Europe (Gotland). Pycnostylus is American/Asian/Australian but not European.

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Dpaul7

Thanks for your reply!  I do believe Rugose!

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