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1
U.S. Geological Survey Professional Paper
Description of these spicules is based on one polyactine specimen in which ray
arrangement is reasonably certain (pl. 6, figs. 6, 7, and text fig. 12) and on several
less-complete specimens of obviously similar nature and distinctive appearance
...
2
Brigham Young University Geology Studies
... 3, figured specimen OUZC 3027, locality TXM-12, from the Salesville
Formation north of Mineral Wells, Texas, photomicrograph showing the
intermediate and outer part of the very fine-textured, polyactine-based, dermal
layer characteristic ...
3
Life Cycle of the Phosphoria Formation: From Deposition to ...
... a microsclere; probably a demosponge selenaster Desma Class
Demospongiae, likely lithistids: polyaxon, polyactine; Tricranoclones are distinct
forms that may prove to have paleogeographic significance Strongyle Class
Demospongiae, ...
4
Microfacies of Carbonate Rocks: Analysis, Interpretation and ...
Characterized by free, rarely linked di-, tri-, tetra- and/or polyactine spicules to
which a basal skeleton can be added. Comprise less than 5% of modern
sponges. Calcareous sponges: The non-systematic term is used in a rather loose
manner ...
5
Sponges of the New Caledonian Lagoon
... (diameter is about 1 5 um), polyactine oxyasters with terminal spines (diameter
is 10 uml; the curved microxeas are often centrotylote, 100-150 umx 2-3 um
Ecology and Habitat In bays and lagoons, in sediment-rich areas, shallow water.
6
Radiolarian biostratigraphy of middle-upper Jurassic pelagic ...
... x80 16 - Oxyaster(Po1yactine), CE 5.77, UAZ E, x200 17 - Phyllotriaene(
Tetractine), IN 4, UAZ D, x80 18 - Pycnaster(Po1yactine), SA 0.35, UAZ E, x150
19 - Rhax (Polyactine), VN 6.10, UAZ D, x300 20 - I-Iexactinellid (Polyactine), SA
0.35, ...
1, 2, small polyactine dermal spicules showing the beginning of secondary
calcification. Chainman Shale (Mississippian-Pennsylvanian), western Millard
County, Utah. 3, partially calcified and obscured large body spicules; rounded
openings ...
8
Proceedings of the United States National Museum
Practically all the species of Cyamon hitherto described have had their distinctive
(polyactine) spicules entirely and finely spined, the other spicules styles. In
contrast, Trikentrion has its polyactine spicules usually triacts and with only one
ray ...
United States National Museum, Smithsonian Institution, United States. Dept. of the Interior, 1886
9
Palaeozoic microfossils from Orphan Knoll, NW Atlantic Ocean
The similar, but smaller (max. diameter 0.135 mm) and more irregular polyactine
stellate spicule of Pl. 6, fig. 2 has short and sturdy, steeply attenuating rays that
radiate from a common centre. Two of the rays are disproportionally long; the ...
10
Acta palaeontologica Polonica
A dozen isolated megasclere spicules of polyactine (?octactine) forms, preserved
as phosphatic sheaths from etching residues of limestone erratic boulders Me32
and 66. Figured specimens, ZPAL Pf.V/ 108$ 1 6; 29U 1 3. Description.—There ...
