Steinernema affine (Bovien, 1937) Wouts et al., 1982

Steinernema affine belongs to the entopathogenic nematodes, i.e. they are able to infect and kill insects (see also: Steinernema). It was orginally described as Neoaplectana affinis from Denmark in 1937 and transferred in 1982 by Wouts et al. to the genus Steinernema Travassos, 1927. The pictures show the infective juveniles (i.e. third-stage juveniles), at this stage the mouth and anus are closed and the pharynx is reduced and non-functional. Often the third-stage juveniles are still enclosed by the retained sheath (part of the old culticle) of the second-stage juveniles. The symbiotic bacteria (Xenorhabdus) are enclosed by an intestinal vesicle, just posterior to the basal bulb. So far this species has been found in Europe and North America.

Pratylenchus thornei Sher & Allen, 1953

Pratylenchus thornei: adult female body
Pratylenchus thornei: adult female body

Pratylenchus thornei: female anterior body part with high lip region
Pratylenchus thornei: female anterior body part with high lip region

Pratylenchus thornei: female anterior body part with stylet and metacorpus
Pratylenchus thornei: female anterior body part with stylet and metacorpus

Pratylenchus thornei: female anterior body part with most of the pharynx visible
Pratylenchus thornei: female anterior body part with most of the pharynx visible
Pratylenchus thornei: female anterior body part with posterior part of the pharynx (including short pharyngeal gland overlap)
Pratylenchus thornei: female anterior body part with posterior part of the pharynx (including short pharyngeal gland overlap)
Pratylenchus thornei: vulva region with single ovary partly visible
Pratylenchus thornei: vulva region with single ovary partly visible

Pratylenchus thornei: vulva region with small empty spermatheca
Pratylenchus thornei: vulva region with small empty spermatheca

Pratylenchus thornei: lateral field with four incisures
Pratylenchus thornei: lateral field with four incisures

Pratylenchus thornei: female with short tail and anus
Pratylenchus thornei: female with short tail and anus

Pratylenchus thornei: female tail with truncated tail end.
Pratylenchus thornei: female tail with truncated tail end.

(Click on the pictures for an enlargement, ©Wageningen University & Research, Laboratory of Nematology/Pictures: Hanny van Megen)