abyssunder Posted April 13, 2016 Share Posted April 13, 2016 Very good, Plax! I agree that they are close to Gastrochaena. Stephenson - Kummelia.pdf 2 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Plax Posted April 13, 2016 Share Posted April 13, 2016 sorry I didn't remember the similar post earlier. bad brain..... Link to comment Share on other sites More sharing options...
Herb Posted April 13, 2016 Share Posted April 13, 2016 my thoughts are with abyssunder "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
Andriy Posted April 28, 2016 Author Share Posted April 28, 2016 Similar fossils, but on the other surface texture - Link to comment Share on other sites More sharing options...
Andriy Posted April 28, 2016 Author Share Posted April 28, 2016 And other basal part - Link to comment Share on other sites More sharing options...
Andriy Posted April 28, 2016 Author Share Posted April 28, 2016 Distal portion fragmented - Link to comment Share on other sites More sharing options...
doushantuo Posted April 28, 2016 Share Posted April 28, 2016 (edited) Shouldn't the whole thing be slightly more clavate,if it's Gastrochaena? Edited April 28, 2016 by doushantuo Link to comment Share on other sites More sharing options...
Rockwood Posted April 28, 2016 Share Posted April 28, 2016 (edited) Distal portion fragmented - These seem more consistent with worm burrows. Edited April 28, 2016 by Rockwood Link to comment Share on other sites More sharing options...
Plax Posted April 28, 2016 Share Posted April 28, 2016 this new one is similar to Ascaulocardium armatum (used to go by the name Clavagella). The "appendages" you have come off of the steinkern. Pojeta and Sohl have good illustrations of the anatomy. Link to comment Share on other sites More sharing options...
Andriy Posted April 28, 2016 Author Share Posted April 28, 2016 Many thanks!!! Link to comment Share on other sites More sharing options...
abyssunder Posted April 28, 2016 Share Posted April 28, 2016 (edited) I agree that in the newly posted samples are types of bivalve tubes (crypts or adventitious tubes) which don't resemble Gastrochaena. Probably they are from other genera or family. As Plax said, could be Ascaulocardium sp. from the Clavagellidae, or maybe from the family Penicillidae. " L.A. Smith (1962a) considered that Clavagella and its allies first appeared in the Upper Cretaceous whereas Brechites and its allies first appeared in the Upper Oligocene. Savazzi (2005) suggests in relation to the Clavagellidae, that tube dwelling species of Clavagella, that is Stirpulina, are known since the Cretaceous, facultative borers (Clavagella sensu stricto) and tube dwellers since the Eocene (Cossmann and Pissarro, 1904-1913), with the facultatively coral-boring Bryopa arising in the Miocene (Savazzi, 2000). Savazzi (2000) considered that Brechites and its allies probably appeared in the Early Oligocene of the northern Tethys although L.A. Smith (1962b) suggested that the various representatives of the Penicillidae have all arisen since the Late Oligocene. A wholly accurate account of the fossil history of watering pot shells is not, however, possible because: (i) all species, like most anomalodesmatans, but especially extant taxa, are "rare"; (ii) the tubes of some are aragonitic, fragile and would not fossilize well, and (iii) adventitious tubes may be confused with, for example, those of polychaetes and gastrochaenid and teredinid bivalves. " (...)Fossil Clavagella and Stirpulina are mostly restricted to Europe (S. pliocenica, Mayoral, 1990) and North America (Stallwood, 1995), but also India (see below), Australia (Clavagella majorina, B.J.Smith, 1971; S. pallinupensis, Morton, 2006b) and from the early Late Miocene of New Zealand (Clavagella oamarutica Maxwell, 1978; Beu and Maxwell, 1990). " The evolution of the watering pot shells (Bivalvia: Anomalodesmata: Clavagellidae and Penicillidae) - Brian Morton http://museum.wa.gov.au/sites/default/files/THE%20EVOLUTION%20OF%20THE%20WATERING%20POT%20SHELLS%20%28BIVALVIA%20ANOMALODESMATA%20CLAVAGELLIDAE%20AND%20PENICILLIDAE%29.pdfThe information available on the fossil history of the Clavagellidae and Penicillidae is summarized in Table 2. Edited April 28, 2016 by abyssunder 1 " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now