Systematics
of chigger mite species group nagayoi (Trombiculidae: Neotrombicula)
A.A.
Stekolnikov
Parazitologiya, 33(6):
465-481 (1999) (In Russian, English summary).
S U M M A R Y
Revision of the group of chigger mite
species, closely related to Neotrombicula nagayoi
(Sasa e.a., 1950) is given. The range of
N. nagayoi is probably restricted
to the Far East. The majority of findings of
"Neotrombicula nagayoi" on the
territory of the former USSR (Southern Siberia, Kyrgyzstan, Kazakhstan,
Caucasus, East Carpathians etc.) should be attributed to
N. tianshana Shao et Wen, 1984, previously known only from the terra typica (China, East Tien Shan).
N. bondari Kudryashova, 1993 and
N. wendai Wen et Wu, 1984 are probable synonyms of
N. tianshana. N.
orestias Stekolnikov, 1994, previously known only from the terra
typica (Turkmenistan, Western Kopetdagh), is for the first time
reported from Kyrgyzstan.
Diagnostic characters in the
nagayoi group are considered thoroughly, key for species is
proposed. Intraspecific variability in
N. tianshana throughout almost
whole areal of this species known up to the present time is
investigated by means of computer methods of multivariate analysis.
Character variance in the whole nagayoi group is
also investigated. In particular, it is found out, that the
geographical variability in
N. tianshana is associated mainly
with the lengths of setae and legs, while the size of scutum and number
of idiosomal setae display first of all an individual variability. At
the specific level in the
nagayoi group the lengths of
setae and legs has also a great importance. Such similarity of
intraspecific geographical variability and character variance at the
specific level indicate significant closeness of species in the
nagayoi group.
Study of correlations between characters in
N. tianshana shows isolation of AM from other setae lengths. Previously the similar effect was discovered by the author in the study of
intraspecific variability of
N. delijani Kudryashova, 1977 and
in the study of character variance in the
vulgaris group. It is an evidence
for the suggestion, that AM able to have a special significance in
taxonomy of the genus
Neotrombicula.
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