Protozoa - Spumellaria - Praeconocaryommidae
Description: Cortical shell with moderately large mammae. Mammae imperforate, hemispherical,high in relief with primary spines originate in center of top surface. Primary spines slender, circular in cross section. Base of each mamma with five to six equally spaced rays. Rays steeply inclined away from mammae and linking up with rays of adjacent mammae. Mammary pore frames small, thin, mostly triangular in outline. Intermammary pore frames subcircular to elliptical in outline,irregularly arranged variable in size and with largest pores among mammae. Cortical shell and medullary shells connecting to each other by circular radial beams. First medullary shell with predominantly triangular pore frames with small nodes at vertices.
Remarks: Praeconocaryomma splendida, differs from P. parvimamma Pessagno and Poisson by possessing smaller variable size of elliptical
intermammary pore frames and by having highly convex, hemispherical
mammae which are circular in outline.
Etymology: Splendidus-a-um (Latin, adj.) bright.
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 decora, Praeconocaryomma hexagona, Praeconocaryomma jiangzeensis, Praeconocaryomma lipmanae, Praeconocaryomma mamillaria, Praeconocaryomma matsuokai, Praeconocaryomma media, Praeconocaryomma parvimamma, Praeconocaryomma sarahae, Praeconocaryomma scatebra, Praeconocaryomma universa, Praeconocaryomma vivenkensis, Praeconocaryomma yakounensis
Type specimen: NMNS (000037). Its type locality is Suplee-Izee area, OR-589D, which is in a Toarcian marine mudstone/limestone in the Snowshoe Formation of Oregon.
Ecology: passively mobile planktonic omnivore
Distribution:
• Jurassic of United States (2: Oregon collections)
Total: 2 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.