On the photos, there are two different nematodes: a male and a female.
The general criteria and observations are indicated directly on the photos.
Here is a comprehensive list of the main characteristics for Aphelenchoides fragariae:
- Length in mm: 0.48-0.623 (male)
- Head shape: Slightly « offset » and lips prominent wider than the body
- Stylet length in µm: 10-13
- Stylet cone: 50 %
- Median bulb oval/round
- Nerve ring behind the muscular median bulb
- Excretory pore at or just behind the nerve ring
- Total body length divided by the maximum body diameter in µm (a): 45.7-61.7 (male)
- Total body length divided by tail length in µm (c): 15.7-18.5 (male)
- Absence of Bursa in the male
- Length of spicules (median line) in µm in male: 16.9-19
- Number of lateral lines: 2 (sometimes 4)
- Shape of tail: conoid
- Shape of mucro: Single central spine (sometimes sin mucro)
