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Nematode

Scientific Name
Discocriconemella limitanea
Scientific Author
(Luc, 1959) DeGrisse & Loof, 1965
Taxonomy
(Nematoda: Tylenchida: Criconematidae)
Pest Status
0 Unknown
Status
0 NZ - Unknown
Reliability
High
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Diagnostic Images

Fullbody - Adult
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Zeng Zhao Landcare Research
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Diagnostic Images (3)
Other Images (1)
Diagnostic Notes
Paratypes (10 females): L = 0.27 mm (0.25-0.29); a = 8 (7-8); b = 2.9 (2.6-3.1); c = 21 (20-26); V = 93 (92-95); stylet = 62 µm (59-66); prorhabdion = 51 µm (48-56); R = 110 (107-116); Rv = 11 (10-12); Ran = 7-8; Rvan = 3-4; Rex = 39 (37-42).

Holotype (female): L =0.27 mm; a = 8; b = 3.1; c = 21; V = 94; stylet = 66 µm; prorhabdion = 56 µm; R = 107; Rv = 10; Ran = 7; Rvan = 3.

Female body plump; curved ventrally after fixation. Head set off, with single annule nonretrose. Body annules retrose except for 7-17 on ventral side. Anastomoses present. Annules with crenated margins, 4-5 µm wide.Stylet robust; knobs anchor-shaped, 7-9 µm across. Oesophago-intestinal valve lobate.Spermatheca ovoid. Sperm cell diameter 1-2 µm. Body diameter distinctly narrows immediately posterior to vulva. Tail blunt with rounded terminus.

Allotype (male): L = 0.32 mm; a = 17; c = 21; T = 42; spicules = 25 µm; gubernaculum = 5 µm.

Body cylindrical. Cephalic region with round protrusion at oral aperture which appears to be an artifact. Stylet absent. Oesophagus poorly developed. Lateral field with 2 faint lines. Excretory pore 99 µm from head region; hemizonid 4 annules anterior to excretory pore. Testis outstretched; sperm cells diameter about 1.0 - 1.5 µm. Cloacal sheath distinct. Spicules curved ventrad. Caudal alae rudimentary. Tail short, blunt with rounded terminus.

Juveniles (3, 4th stage?); L = 0.21 mm (0.20-0.22); a = 6; b = 2.5 (2.3-2.8); stylet = 46 µm (42-48); prorhabdion = 37 µm (33-39); R = 116 (113-120).

Body plump; curved ventally after fixation.Head similar to adult female.Body annules retrose except for 5th to approximately 15th on ventral side. Anastomoses present. Annules smooth throughout body. Stylet robust with anchor-shaped knobs, 7-8 µm across. Developing ovary 72-80 µm long.Tail bluntly conoid.

Type habitat and locality: Soil about the roots of cacao, Theobroma cacao L., at Pauso Alegre, Porto Seguro, Brazil.
More Information
Specimen Contact
MAF Plant Health & Environment Laboratory (Nematode collection held by Zeng Zhao at Landcare Research)
Author
Zhao, Zeng Qi & Crosby, T.K.
Created
03/07/2012 11:52 AEST
Last Updated
17/07/2012 10:23 AEST
Citation
Zhao, Zeng Qi & Crosby, T.K. (2012) Nematode (Discocriconemella limitanea) Updated on 7/17/2012 10:23:18 AM Available online: PaDIL - http://www.padil.gov.au.
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Free for use under the Creative Commons Attribution 3.0 Australia License

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