PaleoDB taxon number: 205009
Original description: Cephalis dome-shaped, with crown-like horn having four to five short branches, each branch circular in cross-section. Thorax and abdomen trapezoidal in outline. Three earlier cham bers narrow, long, subcylindrical in shape, sparsely perforate, covered by layer of microgranular silica. First post-abdominal chamber inflated, subspherical on outline, terminating in narrow subcylindrical tubular extension. Test mainly comprised of pentagonal and hexagonal pore frames. Pore frames small on earlier chambers, medium-sized on postabdominal chamber with thick rims and thin sides. One row of ten to twelve short circumferential spines on equatorial surface of first post-abdominal chamber. Tubular extension perforate with small pores in spiral rows of pore frames.
Original remarks: Katroma clara, n. sp., differs from Katroma bifurca, n. sp., by having a horn with four to five branches rather than with two branches, by having circumferential spines on inflated post-abdominal chamber, and by possessing a test with earlier chamber subcylindrical in shape rather than conical in shape.
Etymology: Clarus-a-um (Latin, adj.) clear.
Synonym: Katroma kurusuensis Hori 1988 (taxon 204989)
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
Sister taxa: Katroma angusta, Katroma aurita, Katroma bicornus, Katroma brevitubus, Katroma elongata, Katroma hullae, Katroma inflata, Katroma inflatio, Katroma irvingi, Katroma milloti, Katroma neagui, Katroma pinquitudo, Katroma regina, Katroma sinetubus, Katroma tetrastyla, Katroma westermanni
- Katroma clara: Its type locality is Suplee-Izee area, OR-536J, which is in a Pliensbachian marine mudstone/limestone in the Nicely Formation of Oregon
- Katroma kurusuensis: OCU MR 4000(F02670).
Ecology: passively mobile planktonic omnivore