Potensaphelenchus stammeri

Potensaphelenchus stammeri	Contents	Rev 12/17/2024
	Classification	Hosts
	Morphology and Anatomy	Life Cycle
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Classification:

       Chromadorea
       Rhabditida
       Tylenchina
         Aphelenchoidea
          Aphelenchoididae
           Parasitaphelenchinae

Potensaphelenchus stammeri Gu, Liu, Abolafia & Pedram, 2021

Type and only species: P. stammeri (Korner, 1954) Gu, Liu, Abolafia & Pedram, 2021

= Aphelenchoides stammeri Korner, 1953

= Ektaphelenchus stammeri (Korner, 1953) J.B. Goodey, 1960

= Seinura lii Huang and Ye, 2006

= Aphelenchoides lii (Huang and Ye, 2006) Kanzaki, Ekino & Masuya, 2019

Morphology and Anatomy:

Large nematodes with slender body.
Cuticle thin, outer layer finely annulated.
Cephalic region raised, rounded, offset from rest of body
Lip region with six conoid lips, oral aperture surrounded by a hexagonal plate
Stoma with wide lumen, conus ca 40% of total length with small basal swellings.
Pharynx with procorpus slender, muscular, well developed, large ellipsoid metacorpus, with large sclerotised valve plates; glandular region comprising ca 25-33% of metacorpus length.
Pharyngo-intestinal junction just posterior to metacorpus base.
Nerve ring surrounding intestine and pharyngeal glands. Excretory pore slightly posterior to nerve ring

Female:

Monodelphic-prodelphic, ovary outstretched, developing oocytes in two rows anteriorly, single row posteriorly,
Spermatheca oblong, full of disc-like sperm, crustaformeria inconspicuous, formed of rounded cells
Vulva with simple lips.
Post-vulval uterine sac (PUS) well developed, extending for 43-66% of vulva to anus distance, sometimes containing sperm.
Tail elongate conoid, dorsally convex and ventrally flat until the mid-point, narrowing thereafter and ventrally bent from middle towards end, its tip finely rounded.

Male:

Common
Monorchic with testis outstretched.
Spicules paired, curved, with tip bluntly rounded,
Seven papillae, arranged as follows: first single papilla (P1) 12-15 ÃŽÂ¼m anterior to cloacal opening, second pair (P2) at about same level as cloacal opening, third pair (P3) at mid-tail and fourth pair (P4) near tail end.
A post-cloacal flap with rounded to sharp tip present immediately posterior to cloacal opening, extending posteriad.
Tail conical, dorsally convex, ventrally concave, bent ventrally, sometimes with elongate (2-3 ÃŽÂ¼m long) mucron-like structure at tip.
Bursa absent.

The genus name is derived from the strong or potent appearance of the feeding structures of the nematode.

Ref: Gu et al., 2021

Reported median body size for this species (Length mm; width micrometers; weight micrograms) - Click:

Distribution:

Described from packaging wood imported into China from Spain. Also reported from declining Pinus massoniana in China.

As Aphelenchoides stammeri, the type species was originally isolated from Spondylis buprestoides and wood of damaged pine and spruce trees (Gu et al., 2021)..

Morphologically, in having a well-sclerotised stylet with wide lumen,.P. stammeri resembles tsome predatory Aphelenchoididae: Seinura spp. and the Ektaphelenchinae genera, Ektaphelenchus, Ektaphelenchoides and Devibursaphelenchus (Gu et al., 2021)

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Hosts:

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Life Cycle:

Ecophysiological Parameters:

For Ecophysiological Parameters for this species, click	If species level data are not available, click for genus level parameters

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Damage:

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Management:

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References:

Gu, J., L. Liu, J. Abolafia, and M. Pedram. 2021. A revision of the taxonomy of Aphelenchoides stammeri Korner, 1954 (Rhabditida: Aphelenchoididae) and proposal for a new genus. Nematology 23:215-228.

Korner, H. 1954. Die Nematoden fauna des vergehenden Holzes und ihre Beziehungen zu den Insekten. Zoologische Jahrbcher, Abteilung fur Systematik, Ekologie und Geographie der Tiere 82, 245-353.