Chazydictya Ross, 1963
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publication ID |
https://doi.org/ 10.5252/geodiversitas2022v44a20 |
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publication LSID |
urn:lsid:zoobank.org:pub:5EC74771-0B7B-494D-ADC8-79BECD097A3A |
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DOI |
https://doi.org/10.5281/zenodo.6723168 |
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persistent identifier |
https://treatment.plazi.org/id/865C87FD-FFBF-FFFD-3B28-FEC24D50FC60 |
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treatment provided by |
Admin |
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scientific name |
Chazydictya Ross, 1963 |
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Genus Chazydictya Ross, 1963 View in CoL
TYPE SPECIES. — Chazydictya chazyensis Ross, 1963 View in CoL by original designation. Darriwilian, Ordovician ; New York, United States .
DIAGNOSIS. — Bifoliate lenticular, branched colonies. Branch transverse section lens-shaped. Autozooecia short, tubular, recumbent at their bases in endozone, bending sharply to colony surface, rectangular to subrhomboidal at their bases, becoming oval at branch surface, arranged in 8 to 15 regular alternating rows on branches. Hemisepta absent. Basal diaphragms rare to common. Mesotheca straight to weakly undulating, two-layered, without median rods. Autozooecial walls granular, in endozone; thick, finely laminated in exozone. Paurostyles in the laminated skeleton abundant, arranged in up to 5 rows between autozooecial apertures, rounded to weakly stellate in tangential section. Maculae absent.
OCCURRENCE. — Darriwilian, Ordovician; United States, Canada. Sandbian, Ordovician; Argentina.
COMPARISON
Chazydictya Ross, 1963 differs from Ptilodictya Lonsdale, 1839 in absence of hemisepta and presence of abundant paurostyles.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.