Redescription of Chronogaster boettgerii Kischke, 1956 is provided. The male of this species was found for the first time, and herein is described and illustrated. Chronogaster boettgeri Kischke, 1956 is distinguished by its amphids circular at the surface and forming a single spiral with a dorsal break, presence of 3 caudal glands arranged in tandem, absence of lateral longitudinal lines, lack of vacuolated lateral glandular bodies, tail tip of female with single, almost ventral and straight mucro; male is distinguished by tail terminus devoid of mucro and absence of tuboid preanal supplements.
Three new species of Chronogaster Cobb are described; two from Mexico and one from Poland. C. jankiewiczi sp. n. is distinguished by its short cephalic sensilla (1.6-3.2 µm), tail tip with a terminal, hook-like and ventrally curved mucro, two subdorsal spines almost the half length of mucro, absence of lateral longitudinal lines, and lack of vacuolated lateral glandular bodies. C. mexicana sp. n. is distinguished by sharply pointed tip of tail without mucro or spines, absence of lateral lines, and the presence of vacuolated lateral glandular bodies. C. polonica sp. n. is distinguished by its tail terminus with ventral claw-like mucro and distinctly swollen 4-6 terminal tail annules, absence of lateral lines, and presence of vacuolated lateral glandular bodies.
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