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Eutylenchus vitiensis

Scientific Name
Eutylenchus vitiensis
Scientific Author
Orton Williams, 1979
Taxonomy
(Nematoda: Atylenchidae)
Pest Status
0 Unknown
Status
0 NZ - Unknown
Reliability
High
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Diagnostic Notes
Description from Orton Williams (1979)

Adult female:

Body slightly curved, elongate, cylindrical, tapering regularly towards head from oesophageal region and towards terminus just posterior to vulva. Cuticle with 12 longitudinal ridges of cuticular blocks alternating with 12 clear longitudinal bands over most of the body. Anteriorly the rows of blocks commence at different levels. Immediately behind head the first 1 or 2 body annules are broken only midlaterally on either side of the body by a single cuticular block which immediately divides on subsequent annules to form 2 rows. At about the 5th body annule, 3 dorsal and 3 ventral rows of blocks commence at or nearly at the same level, giving rise to a total of 10 rows which continue for some way behind head. The final 2 rows of blocks arise midlaterally in the anterior Vs of the oesophageal region. The number of rows is reduced posterior to anus, the midlateral rows disappearing first. Annules 1.4-1.7 µm in width at midbody.

Cephalic region set off by deep constriction, not annulated, and bearing 4 setae. Lip region projecting slightly from head contour. In face view head clearly composed of four lobes separated by dorsal, ventral and lateral incisures, each lobe bearing a seta. Setae 8-13 /am long with a wider basal portion and finer distal portion which tapers to a point, the junction of the 2 parts marked by a fine inwardly directed process. Amphid apertures not seen in face view (2 females). Conns of stylet fine, 10.5-13.5 µm long, shorter than shaft. Stylet knobs flattened or slightly concave anteriorly. Dorsal oesophageal gland orifice about 2 mm from stylet base. Median bulb well developed, isthmus slender with nerve ring near middle, widening to elongate basal bulb. Oesophagus 115-142 µm long. Excretory pore 68-81 µm from anterior end at level of nerve ring or just anterior. Hemizonid two or three body annules long, situated 6-16 clear annules (8-23 µm) posterior to excretory pore.

Gonad single, outstretched; spermatheca not seen. Postuterine sac 1.1-1.8 times body width at vulva, sometimes with a rudimentary cell or cells at its posterior end. Vulva-anus distance 105-128 µm varying from 33 µm less than tail length to 12 µm more, generally a few micrometers less. Tail 99-138 µm long, 10-14 times body width at anus, tapering regularly to a pointed terminus.

Adult male:

Body straight or slightly curved, tapering regularly towards head from oesophageal region, constricted after cloaca. Number and anterior origin of cuticular ridges similar to that of female. Posteriorly, number of ridges reduced at bursa. Annules 1.2-1.6 µm in width at midbody. Cephalic region set off by deep constriction, not annulated, and bearing 4 setae. Lip region projecting slightly from head contour. Setae 5-7.5 µm long, rod shaped with rounded distal ends, inwardly directed processes absent. Conus of stylet fine, 11.5-13 µm long, shorted than shaft. Stylet knobs flattened or slightly concave anteriorly. Dorsal oesophageal gland orifice about 2 µm from stylet base. Oesophagus resembling that of female, 110-135 µm long. Excretory pore 64-83 µm from anterior end, at level of nerve ring or just anterior. Hemizonid about 2 body annules long, situated 5-16 clear annules (8-21 µm) posterior to excretory pore.

Testis single, outstretched. Ventral body wall protruding in cloacal region, anterior lip of cloaca projecting slightly further than posterior lip. Caudal alae prominent, triangular or "fin-shaped" with a finely rounded apex and crenate outer edge. Alar base usually extending less than one cloacal body width in front of cloacal aperture. Spicules slightly curved; gubernaculum simple, slightly curved. Body narrowing posterior to cloaca. Tail 98-137 µm present in about the same numbers as females.

Juvenile:

Similar to adults except for gonad development.

More Information
Specimen Contact
New Zealand Arthropod Collection
Author
Zhao, Zeng Qi & Crosby, T.K.
Created
08/07/2013 12:51 AEST
Last Updated
30/03/2014 22:42 AEST
Citation
Zhao, Zeng Qi & Crosby, T.K. (2013) Eutylenchus vitiensis (Eutylenchus vitiensis) Updated on 3/30/2014 10:42:44 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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