Baltisphaeridium sparsum Drugg, 1967

Holotype: Drug, 1967, pl.6, fig.1
Locus typicus: Escarpado Canyon, California
Stratum typicum: Maastrichtian-Danian

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Original description: [Drugg, 1967, p. 33]

Diagnosis:
Test usually egg-shaped, covered with processes which have two or three branches. At times the branching of the processes takes place at one level but in many cases two levels of branching are present. The distal ends of the processes are slightly capitate. The bases of the processes are often connected by thin web-like membranes but many of the processes stand alone. The wall of the test is markedly granulate. By inference, because of the presence of the web-like membranes, the wall must be double with the processes arising from a thin outer layer. This has not, however, been verified in cross-sectional views. An archeopyle has not been observed.
This species is abundant in the lower Dos Palos.

Dimensions:
Holotype, test 42 x 47 µm, processes 8 - 10 µm long; range of test size, 35 to 47 µm.