Body cylindroid, tapering rapidly to narrow lip-region. Posteriorly ending in a slightly clavate tail with strong radial striae. Lateral fields 2 or 3 times as wide as cuticle thickness. Amphids almost as wide as head, their sensilla lying just posterior to base of spear extensions. Spear 5 or 6u long. Guiding ring not observed. Esophagus at first slender, fusiform, tapering to a narrow tube as it passes through the nerve-ring. Basal half of esophagus enlarged by gradual expansion, glandular, with weak radial musculature, all 5 nuclei usually visible. Cardia cylindroid, but sometimes compressed to a disk by fixation. Intestinal cells hyaline with few scattered granules. Prerectum length 4 or 5 times body width. Vulva transverse. Anterior uterine branch shorter than body diameter. Ovary reflexed halfway or more to vulva, often pressed forward by developing ova. At flexure of ovary is a pouchlike organ visible in young females in which are several bodies which which may be syngonic spermatozoa.
Male body similar to that of female. Testes well-developed with great numbers of spermatozoa. Spicula rather angular, with tiny lateral guiding pieces. Copulatory musculature very obscure. Supplements an adanal pair and 2 ventro-median, widely spaced. Belondira parva is distinctive because of its small size and tail form.
Habitat. – Soil about the roots of yam, Aguada and Gurabo; coffee, Limani; banana, Rio Piedras; and El Yunque Rain Forest.