Oithona amazonica Burckhardt 1913

Oithona amazonica Burckhardt, 1912

Oithona amazonica Burckhardt, 1912:726; 1913:422, pl. 15P: figs. 6–22; pl. 15Q: figs. 2, 3; pl. 16R: figs. 2–4, 7–9, 11, 12; pl. 16s: figs. 1, 3–8, 17.

Oithona amazonica continentalis Lindberg, 1954:193–195, fig. 1.

MATERIAL—3 and 3 from PN-8-260.

FEMALE.—Lengths 0.61, 0.60, 0.60 mm; Pr/ Ur-1.3, 1.3, 1.4. ReP1 (Figure 2e) with 1–1–3 Se. St Re3P1 seta-like (see “Remarks”); Se ReP2 11–3, ReP3 1–1–1, and ReP4 0–0–1; St Re3P2–4 well developed. Ri3P4 with both setae unmodified; Ri3P4 proximal seta straight, slightly thickened, with serrate flange on distal 2/3 of medial edge (Figure 2h). Knob near genital opening armed with a minute, slender spine (Figure 2b).

MALE.—Length of specimens 0.57, 0.56, 0.55 mm; Pr/Ur-1.7, 1.5, 1.6. Se ReP1 1–1–3 (Figure 2k); Se ReP2–4: 1–1–3, 1–1–1, 0–0–1; St Re3P1–4 well developed; Ri3P4 proximal seta not modified. Cph and flap (Figure 2j) not dissected from specimens. Pore signature similar to hebes/fonsecae pattern (described under O. fonsecae) but with distinct hiatus between dorsal horizontal row and 2 anterior columns of organs making up anterodorsal cluster. In O. hebes and O. fonsecae longitudinal row proceeds into and is continuous with anterodorsal cluster.