Protozoa - Spumellaria - Praeconocaryommidae
Description: Cortical shell with closelyspaced mammae. Mammae uniform in size, moderately large, high in relief, distal surface rounded, hexagonal or subcircular in outline, with long primary spine originating from center of each mamma. Primary spines slender, circular in axial section. Each mamma with five to seven short rays
connection directly to adjacent mammae of linking with rays from sur
rounding mammae. Rays single, bifurcate, or trifurcate. Mammary pore frames poorly developed, with thin bars connecting massive rays and forming small subtriangles beneath mammae. Intermammary pore frames large, regular in size, mostly triangular and tetragonal in outline.
Remarks:Praeconocaryomma decora is very similar to P. immodica Pessagno and Poission (1981) by having a cortical shell with large rounded, closely spaced mammae and by having primary spines circular in axial section. These two species can be distinguished by different pattern of intermammary pore frames.
Etymology Decorus-a-um (Latin, adj.) graceful.
Full reference: K. Y. Yeh. 1987. Taxonomic Studies of Lower Jurassic Radiolaria from East-Central Oregon. National Museum of Natural Science Special Publications 2:1-169
Belongs to Praeconocaryomma according to K. Y. Yeh 1987
Sister taxa: Praeconocaryomma bajaensis, Praeconocaryomma californiaensis, Praeconocaryomma copiosa, Praeconocaryomma hexagona, Praeconocaryomma jiangzeensis, Praeconocaryomma lipmanae, Praeconocaryomma mamillaria, Praeconocaryomma matsuokai, Praeconocaryomma media, Praeconocaryomma parvimamma, Praeconocaryomma sarahae, Praeconocaryomma scatebra, Praeconocaryomma splendida, Praeconocaryomma universa, Praeconocaryomma vivenkensis, Praeconocaryomma yakounensis
Type specimen: NMNS (000035). Its type locality is Suplee-Izee area, OR-600A, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.
Ecology: passively mobile planktonic omnivore
Distribution:
• Jurassic of Canada (3: British Columbia collections), Indonesia (1), Japan (2), Mexico (1), the Philippines (4), Slovenia (5), United States (7: California, Oregon)
Total: 23 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.