Polycystinea - Spumellaria - Hagiastridae

Description: Test with large central area and short, wide rays. Rays tapering distally with short, massive triradiate spines. One spine slightly longer than other three. Rays comprised of large tetragonal and pentagonal pore frames with five pores visible laterally at proximal end and three pores visible distally. Central area of cortical shell consisting of concentrically arranged pentagonal and hexagonal pore frames without prominent nodes at vertices. Test with or without patagium.

Remarks: Higumastra laxa, n. sp., differs from H. splendida, n. sp., by lacking massive nodes at pore frame vertices and by having wider rays with shorter primary spines

Etymology: Laxus-a-um (Latin, adj). wide

Synonym: Higumastra splendida 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 Higumastra according to Yeh 1987

See also Gorican et al. 2006 and Yeh 1987

Sister taxa: Higumastra angustabraccia, Higumastra devilsgapensis, Higumastra exigua, Higumastra hui, Higumastra imbricata, Higumastra inflata, Higumastra lupheri, Higumastra obesabraccia, Higumastra scassoi, Higumastra transversa

Type specimens:

• Higumastra laxa: NMNS (000011). Its type locality is Suplee-Izee area, OR-600M, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.
• Higumastra splendida: NMNS (000017). 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.