Polycystinea - Nassellaria - Crubidae

Origianl description: Test wide, subcylindrical, usually with eight to ten post-abdominal chambers Cephalis conical, with short massive rudimentary horn and covered with layer of microgranular silica. Thorax to second post-abdominal chambers covered by layer of massive, irregular polygonal pore frames. Costae moderately thick, about ten to twelve visible laterally.

Original remarks: Crubus chengi Yeh, n. sp.,differs from C. robustus, n. sp., by having a long, massive horn, and having a test with apical port ion more pointed in nature. Crubus chengi, n. sp., differs from C. firmus, n. sp., by having a more cylindrical test with more massive horn on a smaller cephalis.

Etymology: This species is named for Dr. Yen-Nien Cheng for his help on this project.

Synonym: Crubus robustus Yeh 1987

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 Crubus according to K. Y. Yeh 1987

See also Gorican et al. 2006

Sister taxon: Crubus firmus

Type specimens:

• Crubus chengi: NMNS (000095). Its type locality is Suplee-Izee area, OR-600M, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.
• Crubus robustus: NMNS (000099). Its type locality is Suplee-Izee area, OR-600M, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.

Distribution:

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Specimen images are retrieved through the ePANDDA API.