Zobrazeno 1 - 10
of 32
pro vyhledávání: '"Robert L. Anstey"'
Autor:
Robert L. Anstey, Victoria E. McCoy
Publikováno v:
Palaeogeography, Palaeoclimatology, Palaeoecology. 297:420-427
Six distinct bryozoan paleobiogeographical provinces existed during the Silurian of North America, Baltica and Siberia. These provinces are based on parsimony analysis of endemicity (PAE), each supported by a number of endemic genera only present in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0f7bb398a5d6dfe909de38ea0cb33a0
https://doi.org/10.1016/j.palaeo.2010.08.025
https://doi.org/10.1016/j.palaeo.2010.08.025
Publikováno v:
Journal of Paleontology. 84:695-708
The new genus Iberostomata (Bryozoa, Ptilodictyina) from the Cystoid Limestone Formation in the Iberian Chains (NE Spain) is here described and its phylogenetic relationships analyzed using cladistic methods. Twenty-eight identifying characters used
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c790aeab32bdb6e6a46c7f9448560e8
https://doi.org/10.1017/s0022336000058406
https://doi.org/10.1017/s0022336000058406
Autor:
Joseph F. Pachut, Robert L. Anstey
Publikováno v:
Paleobiology. 35:209-230
Recent analytical advances have permitted quantitative evaluations of evolutionary mode in populations of fossil organisms by providing tests of the null hypothesis that patterns of stratigraphic character variation do not differ from the expectation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af231077c745f670d0b560166cca4768
https://doi.org/10.1666/07055.1
https://doi.org/10.1666/07055.1
Autor:
Joseph F. Pachut, Robert L. Anstey
Publikováno v:
PALAIOS. 22:476-488
In the Ordovician bryozoan genus, Peronopora, stratigraphic occurrences and cladistic branching order are significantly correlated, indicating sequential development of both patterns in geological time. Five species have stratigraphic first appearanc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3d7012a869fbb1f02165c5f597dce258
https://doi.org/10.2110/palo.2005.p05-128r
https://doi.org/10.2110/palo.2005.p05-128r
Autor:
Joseph F. Pachut, Robert L. Anstey
Publikováno v:
Journal of Paleontology. 78:651-674
We compare cladistic, phenetic, stratophenetic, and typological methods of recognizing species within a single well-sampled, long-lived Ordovician bryozoan genus, Peronopora Nicholson, 1881. A consensus of 11 methods recognizes 14 species within Pero
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d86f12f82945d002da699e35ea1fb23b
https://doi.org/10.1666/0022-3360(2004)078<0651:capros>2.0.co
https://doi.org/10.1666/0022-3360(2004)078<0651:capros>2.0.co
Publikováno v:
Paleobiology. 29:305-328
Area cladograms produced by parsimony analysis of endemicity illustrate historically developed biogeographical associations among Caradocian, Ashgillian, Llandoverian, and Wenlockian bryozoans. Areas in North America, Siberia, and Baltica were organi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d48eec2a0f07b57c1707a8637751886
https://doi.org/10.1666/0094-8373(2003)029<0305:pobett>2.0.co
https://doi.org/10.1666/0094-8373(2003)029<0305:pobett>2.0.co
Publikováno v:
Journal of Paleontology. 70:373-380
Observed diversity of bryozoans within Devonian stages is not significantly different from range-through values for species because very few species have ranges longer than a single stage. Generic diversity differs significantly between observed stad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::efd0540e94bf3f7b4012d9a40a0fc9cf
https://doi.org/10.1017/s0022336000038312
https://doi.org/10.1017/s0022336000038312
Publikováno v:
Journal of Paleontology. 68:978-994
Until the late 1960's, most of Nicholson's types of Paleozoic bryozoans were not available for study. We present a set of coded characters of many of Nicholson's types, which should assist in bringing his species into conformity with current taxonomi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::64f4188c41c66ec139f930838c1394f0
https://doi.org/10.1017/s0022336000026597
https://doi.org/10.1017/s0022336000026597
Autor:
Robert L. Anstey, Michael E. Tuckey
Publikováno v:
Lethaia. 25:111-117
An analysis of the final stratigraphic appearances of byrozoan species and genera, compiled in a world-wide bryozoan data base, revealed three discrete Late Ordovician extinctions. A Late Carddoc (Onnian) extinction was most pronounced on the plates
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::92a86dbb336f37e7f5e4038147f6ef23
https://doi.org/10.1111/j.1502-3931.1992.tb01795.x
https://doi.org/10.1111/j.1502-3931.1992.tb01795.x
Publikováno v:
Journal of Paleontology. 65:213-233
Recognition of ontogeny within a stenolaemate bryozoan colony requires separating the individualistic aspects of a zooid's growth from those of its neighbors. The ancestrula is the only zooid within a colony that always displays a partially independe
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4322e64cd5ffe7bd123b64fbac316d77
https://doi.org/10.1017/s0022336000020448
https://doi.org/10.1017/s0022336000020448