Litomosoides circularis (von Linstow, 1899). A-G, female: A. Anterior part; B. Head, ventral view (ventral chord figured); C. Head, dorsal view; D. Head, left lateral view (lateral chord and crest figured); E. Tail, lateral view; F. Caudal extremity, ventral view; G. Sheathed uterine microfilaria. H-N, male: H. Caudal part, lateral view; I. Tail, ventral view, except distal extremity in lateral view; J. Lamina of left spicule, sublateral view; K. Buccal capsule; L. Right spicule, lateral view; M. Caudal extremity, ventral view; N. Area rugosa, at mid-length, lateral view. Scales in μm: A, 200; B, C, D, I, J, K, L, M, 15; E, 100; F, G, N, 10; H, 30.