Protozoa - Nassellaria - Syringocapsidae
Original description: Test as with genus, elongate spindle-shaped, with slight constrictions between joints, with as many as nine post-abdominal chambers. Cephalis dome-shaped, medium in size, without horn. Thorax and subsequent chambers trapezoidal in outline, gradually increasing in width as added, with final post-abdominal chamber slightly inflated and terminating in narrow, latticed, tubular extension. Cephalis imperforate, thorax and abdomen sparsely perforate, covered by layer of microgranular silica. Post-abdominal chambers consisting of single layer of subregular tetragonal, pentagonal, and hexagonal pore frames. Pore frames gradually increasing in size distally.
Etymology: Aptus-a-um (Latin, adj.) useful.
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 Pleesus according to K. Y. Yeh 1987
Sister taxa: none
Type specimen: NMNS (000129). 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), Japan (2), Oman (2), the Philippines (3), United States (5: Oregon)
Total: 15 collections each including a single occurrence
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.