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Descriptions of Four New Species of Criconematidae, Male of Ogma Terrestris (Tylenchida: Criconematoidea) and Tylaphelenchus Yamani Sp. N. (Aphelenchina: Aphelenchoididae)

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Four new species of Criconematidae, the male of Ogma terrestris Raski & Valenzuela-A., 1986, and Tylaphelenchus yamani sp. n. are described from soil and root samples taken in southern Chile. Females of Ogma sagi sp. n. are distinguished by up to seven large, cuticular scales per annulus, bearing many, fine spines at tip of each; also by the single, smooth, cephalic annulus set off by distinct 'collar', length = 437-632 μm, stylet = 77-92 μm and total body annuli (65-74). The males have four lines in lateral field, coarse annuli, prominent caudal alae, long, graceful spicules. The male of Ogma terrestris is characterized by its lateral field with two prominent lines and many, shallow, irregular, longitudinal lines between; also by its conoid tail with ragged appearance from angular annuli; and by low caudal alae, graceful spicules. Criconema orellanai sp. n. is distinguished by its single, smooth, cephalic annulus, rounded not retrorse; tail with last 4-5 annuli markedly narrowing giving a slightly spicate outline; its body length = 359-479 μm, stylet = 64-75 μm, and 108-117 body annuli. Criconema navarinoense sp. n. is distinguished by its 63-71 coarse annuli, single cephalic annulus set off by narrow 'collar', robust stylet 67-72 μm, and tail shape bluntly conoid. Criconema osornoense sp. n. is distinguished by 46-52 coarse annuli, smooth except for small bead-like to scalloped cuticular markings on last 3-4, terminus rounded, nipple-shaped; also by its body length 329-414 μm, stylet = 76-83 μm. Tylaphelenchus yamani sp. n. is distinguished by its stylet 11-14 μm, body length 450-809 μm, long overlapping oesophageal glands, obscure isthmus with lumen extending 22-25 μm to oesophago-intestinal junction, tail bearing many microvillae-like cuticular projections, lateral field a narrow band set off by two prominent lines reaching to terminus.

Affiliations: 1: Division of Nematology, University of California, Davis, CA 95616, U.S.A.; 2: Departamento de Sanidad Vegetal, Universidad de Chile, Casilla 1004, Santiago, Chile


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