ZALASIEWICZ, JAN A., PAGE, ALEX, RICKARDS, R. BARRIE, WILLIAMS, MARK, WILBY, PHILIP R., HOWE, MICHAEL P. A., SNELLING, ANDREA M. (2013) Polymorphic organization in a planktonic graptoloid (Hemichordata: Pterobranchia) colony of Late Ordovician age. Geological Magazine, 150 (1) 143-152 doi:10.1017/s0016756812000349
| Reference Type | Journal (article/letter/editorial) | ||
|---|---|---|---|
| Title | Polymorphic organization in a planktonic graptoloid (Hemichordata: Pterobranchia) colony of Late Ordovician age | ||
| Journal | Geological Magazine | ||
| Authors | ZALASIEWICZ, JAN A. | Author | |
| PAGE, ALEX | Author | ||
| RICKARDS, R. BARRIE | Author | ||
| WILLIAMS, MARK | Author | ||
| WILBY, PHILIP R. | Author | ||
| HOWE, MICHAEL P. A. | Author | ||
| SNELLING, ANDREA M. | Author | ||
| Year | 2013 (January) | Volume | 150 |
| Issue | 1 | ||
| Publisher | Cambridge University Press (CUP) | ||
| DOI | doi:10.1017/s0016756812000349Search in ResearchGate | ||
| Generate Citation Formats | |||
| Mindat Ref. ID | 260712 | Long-form Identifier | mindat:1:5:260712:6 |
| GUID | 0 | ||
| Full Reference | ZALASIEWICZ, JAN A., PAGE, ALEX, RICKARDS, R. BARRIE, WILLIAMS, MARK, WILBY, PHILIP R., HOWE, MICHAEL P. A., SNELLING, ANDREA M. (2013) Polymorphic organization in a planktonic graptoloid (Hemichordata: Pterobranchia) colony of Late Ordovician age. Geological Magazine, 150 (1) 143-152 doi:10.1017/s0016756812000349 | ||
| Plain Text | ZALASIEWICZ, JAN A., PAGE, ALEX, RICKARDS, R. BARRIE, WILLIAMS, MARK, WILBY, PHILIP R., HOWE, MICHAEL P. A., SNELLING, ANDREA M. (2013) Polymorphic organization in a planktonic graptoloid (Hemichordata: Pterobranchia) colony of Late Ordovician age. Geological Magazine, 150 (1) 143-152 doi:10.1017/s0016756812000349 | ||
| In | (2013, January) Geological Magazine Vol. 150 (1) Cambridge University Press (CUP) | ||
| Abstract/Notes | AbstractGraptolites are common fossils in Early Palaeozoic strata, but little is known of their soft-part anatomy. However, we report a long-overlooked specimen ofDicranograptusaff.ramosusfrom Late Ordovician strata of southern Scotland that preserves a strongly polymorphic, recalcitrant, organic-walled network hitherto unseen in graptoloid graptolites. This network displays three morphologies: proximally, a strap-like pattern, likely of flattened tubes; these transform distally into isolated, hourglass-shaped structures; then, yet more distally, revert to a (simpler) strap-like pattern. The network most likely represents a stolon-like system, hitherto unknown in graptoloids, that connected individual zooids. Its alternative interpretation, as colonial xenobionts that infested a graptoloid colony and mimicked its architecture, is considered less likely on taphonomic and palaeobiological grounds. Such polymorphism is not known in non-graptolite pterobranchs, which are less diverse and morphologically more conservative: a division of labour between graptoloid zooids for such functions as feeding, breeding and rhabdosome construction may have been the key to their remarkable evolutionary success. | ||
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