Helicotylenchus
Encyclopedia
Helicotylenchus is a genus of nematodes in the family Hoplolaimidae
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. Female : Body vermiform, spiral to straight. Labial region continuous to slightly offset, rounded or anteriorly flattened, generally annulated but never longitudinally striated; anterior lip annulus generally not divided into sectors, with elongate amphid spertures (SEM). Rarely faint or marked lip sectors are present. Lateral field with four lines. Phasmids small, near anus; cephalids and caudalid present. Tail 1 to 2½ body diameters long, typically more curved dorsally, with or without a terminal ventral process, sometimes rounded. Stylet and labial framework averagesized. Dorsal gland opening from 6 to 16 µm from stylet base. Median bulb rounded with average-sized valve. Glands overlap intestine dorsally and ventrally, all three glands of about the same length. Two genital branches, the posterior one sometimes degenerated or reduced to a PUS. Epiptygma present but folded inwards, into the vagina. Vulval flaps present, inconspicuous. Male : Slight secondary sexual dimorphism seen in smaller anterior end. Caudal alae enveloping tail end.
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Hoplolaimidae
Hoplolaimidae is a family of plant pathogenic nematodes. It has two subfamilies, Hoplolaiminae and Rotylenchulinae. Typically hoplolaimids are ecto- or semi endoparasites of higher plants.-Type subfamily :Hoplolaiminae Filip'ev, 1934....
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Diagnosis
HoplolaimidaeHoplolaimidae
Hoplolaimidae is a family of plant pathogenic nematodes. It has two subfamilies, Hoplolaiminae and Rotylenchulinae. Typically hoplolaimids are ecto- or semi endoparasites of higher plants.-Type subfamily :Hoplolaiminae Filip'ev, 1934....
. Female : Body vermiform, spiral to straight. Labial region continuous to slightly offset, rounded or anteriorly flattened, generally annulated but never longitudinally striated; anterior lip annulus generally not divided into sectors, with elongate amphid spertures (SEM). Rarely faint or marked lip sectors are present. Lateral field with four lines. Phasmids small, near anus; cephalids and caudalid present. Tail 1 to 2½ body diameters long, typically more curved dorsally, with or without a terminal ventral process, sometimes rounded. Stylet and labial framework averagesized. Dorsal gland opening from 6 to 16 µm from stylet base. Median bulb rounded with average-sized valve. Glands overlap intestine dorsally and ventrally, all three glands of about the same length. Two genital branches, the posterior one sometimes degenerated or reduced to a PUS. Epiptygma present but folded inwards, into the vagina. Vulval flaps present, inconspicuous. Male : Slight secondary sexual dimorphism seen in smaller anterior end. Caudal alae enveloping tail end.
Species
- Helicotylenchus canadensis Waseem, 1961
- Helicotylenchus depressus Yeates, 1976
- Helicotylenchus dihysteraHelicotylenchus dihysteraHelicotylenchus dihystera is a plant pathogenic nematode. It is known to inhabit sugarcane, rice, potatoes, corn, peanut, millet, sorghum, forest trees, and banana.- External links :*...
(Cobb, 1893) Sher, 1961 - Helicotylenchus labiatus
- Helicotylenchus multicinctusHelicotylenchus multicinctusHelicotylenchus multicinctus is a plant pathogenic nematode.- External links :*...
(Cobb, 1893) Golden, 1956 - Helicotylenchus pseudorobustus
- Helicotylenchus varicaudatus
- Helicotylenchus vulgaris Yuen, 1964
See complete list in http://genisys.prd.fr/nemaid.html