Oithona simplex Farran 1913

Oithona simplex Farran, 1913

Oithona simplex Farran, 1913:187–188, pl. 29: figs. 10–14; pl. 30: figs 1, 2.—González and Bowman, 1965:274, fig. 21f-i.—Chen et al., 1974:74, pl. 3: figs. 1–3.—Nishida et al., 1977:151–152, fig. 23.

MATERIAL.—Numerous and from PN-11-60, PN-19-60, PN-19-60, PN-20-60, PN-21-60, PN-23-60, PN-25-60, PN-26-60, PN-27-60, PN-32-200, PN-32-200, PN-33-200, PN-44-200, PN-45-200, PN-46-200, PN-65-200, PN-66-200, PN-67-200, PN-70-200, and NMNH-STRI Sta 126.

FEMALE.—Length range (30 specimens) 0.37–0.41 mm; Pr/Ur-1.6. Ri2 and 3P4 Si without curvature or flange, simple and plumose yet shorter and thinner than remaining Si (Figure 12c). Knob near genital opening with small, thin spine medially, a smaller spine ventrally, and a tiny spine dorsally (Figure 12b).

MALES.—Length range (30 specimens) 0.41–0.50 mm; Pr/Ur-1.5. Cph similar to female, without flap. Pore signature a series of columns with some connection ventrally between columns, suggesting horizontal series; without anterodorsal cluster (Figures 12d, g, 15g). Individual pores without well-developed ridges; integument slightly thickened anteriorly and posteriorly (Figure 15h).