Parachasmatopora sp. A
publication ID |
https://doi.org/ 10.5252/geodiversitas2022v44a20 |
publication LSID |
urn:lsid:zoobank.org:pub:5EC74771-0B7B-494D-ADC8-79BECD097A3A |
DOI |
https://doi.org/10.5281/zenodo.6723180 |
persistent identifier |
https://treatment.plazi.org/id/865C87FD-FFBF-FFFF-39FB-FB414C2AF963 |
treatment provided by |
Admin |
scientific name |
Parachasmatopora sp. A |
status |
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( Figs 16G View FIG ; 17 View FIG A-E)
MATERIAL EXAMINED. — CEGH-UNC 27526 a, CEGH-UNC 27529 b, CEGH-UNC 27533 a, CEGH-UNC 27545 a, b.
OCCURRENCE. — La Pola Formation, Upper Ordovician, Sandbian; La Pola creek section near Albardon village, San Juan Province, Argentine Precordillera, western Argentina.
DESCRIPTION
Exterior
Reticulate colonies consisting of regularly anastomosing branches. Branches rounded in cross section, 0.25-0.47 mm wide and 0.30-0.50 mm thick. Fenestrules elliptical, 0.22- 0.30 mm wide and 0.43-0.91 mm long. Autozooecial apertures rounded to oval, arranged in two alternating rows on branches, 3-4 in each fenestrule length, 0.05-0.09 mm in width.Low keel between autozooecial aperture rows carrying small elliptical nodes. Heterozooecia absent. Microstylets occurring both on reverse and obverse sides of colony, 0.02-0.03 mm in diameter.
Interior
Autozooecia long, rectangular in deep tangential section, occasionally having abundant diaphragms. Vestibule short. Hemisepta absent.Inner granular skeleton hyaline, 0.005 -0.008 mm thick. Outer lamellar skeleton usually well-developed on both obverse and reverse sides of colony, 0.075 - 0.040 mm thick.
COMPARISON
Parachasmatopora sp. A species differs from Parachasmatopora maennili Morozova & Lavrentjeva, 1981 in smaller autozooecial apertures (0.05-0.09 mm vs 0.10-0.12 mm in P. maennili ). Superficially, Parachasmatopora sp. Ais similar to Parachasmatopora typicalis ( Bassler, 1952) . However, the latter species was only externally figured ( Bassler 1952: figs 8-9). Therefore, a detailed comparison is impossible.
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.
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