J. Liu et Re. Berry, STEINERNEMA OREGONENSIS N-SP (RHABDITIDA, STEINERNEMATIDAE) FROM OREGON, USA, Fundamental and applied nematology, 19(4), 1996, pp. 375-380
A new species in the genus Steinernema was found near Grant's Pass, Or
egon. Steinernema oregonensis n. sp. can be distinguished from other S
teinernema species by the length of infective juveniles, the shape of
spicules, the absence of a tail mucron in first generation males, and
the presence of a tail mucro in second generation males. The length of
infective juveniles ranged from 816 to 1112 mu m, separating S. orego
nensis n. sp. from previously described Steinernema species except S.
affinis, S. anomali, S. feltiae, S. glaseri, S. neocurtillis, and S. p
uertoricensis. The spicule shape and the absence of tail mucron in fir
st generation male separate S. oregonensis n. sp. from these species.
Ratio d and ratio e of the infective juveniles ranged from 0.4 to 0.6
and from 0.9 to 1.1, separating this new species from S. cubana, S. gl
aseri, S. neocurtillis, and S. puertoricensis. DNA analysis showed tha
t S. oregonensis n. sp. has distinct random amplified polymorphic DNA
fragments compared to the other four Steinernema species examined. S.
oregonensis n. sp. did not hybridize with closely related species : S.
anomali, S. feltiae, or S. glaseri.