Leioseius changbaiensis Yin & Bei, 1991

JoharchiK, Omid, DökerK, Ismail & KhaustovK, Vladimir A., 2023, A new species and a new record of Leioseius Berlese (Acari: Mesostigmata: Ascidae) from Russia, with a review of the Russian species of the genus, Acarologia 63 (4), pp. 1139-1153 : 1140-1145

publication ID	https://doi.org/ 10.24349/fpby-by6k
publication LSID	lsid:zoobank.org:pub:E22C69A6-5A6A-4811-A85E-D3FAAD4316E5
persistent identifier	https://treatment.plazi.org/id/3B69DC1F-160F-FFDE-FE78-DFB8C11AFA1B
treatment provided by	Felipe
scientific name	Leioseius changbaiensis Yin & Bei, 1991
status

Treatment

Leioseius changbaiensis Yin & Bei, 1991 View in CoL

Leioseius changbaiensis Yin & Bei, 1991: 147 View in CoL . Leioseius changbaiensis View in CoL . Lindquist & Moraza 2018: 1988.

– General view of caudal setae J5 and Z5; D – Presternal platelets and sternal shield; E – Ventrianal shield; F – Subcapitulum; G – Epigynal shield; H – Epistome; I – Chelicera.

( Figures 1–3 View Figure 1 View Figure 2 View Figure 3 )

Specimens examined — Two females, Ulaganskiy Rayon, Altai Republic, Russia,

50°24′23.4″N 87°35′58.8″E, 19 July 2021, alt. 1827 m, O. Joharchi, I. Döker, V.A. Khaustov coll., under bark of rotten stump.

Remarks — Leioseius changbaiensis was originally described from Changbai Mountains,

Jilin Province, China ( Yin and Bei 1991). This species, known only from the type series,

was found under the bark of a tree, and is now recorded in the Altai Republic, Russia, very close to type locality in China from the same habitat. Our female specimens ( Figure 1 View Figure 1 ) agree well with the original description given by Yin and Bei (1991). We were unable to locate the types of L. changbaiensis but the following ecological, geographic and morphological features suggests that the specimens which we examined are conspecific with those described by Yin and Bei (1991): (1) habitat-specific, found under the bark of tree; (2) distributed in Northeast Asia ( China and Altai Republic); (3) morphological features. However, the original description is brief and its illustrations are incomplete, lacking most important details,

especially those concerning leg chaetotaxy. We herein provide additional morphological characters to complement the previous description ( Yin and Bei 1991) of L. changbaiensis based on specimens from Russia, but also in comparison with the original description.

Dorsal idiosoma — ( Figures 1A View Figure 1 & 2A View Figure 2 ) — Dorsal shield strongly reticulated over entire surface, somewhat scabrid, with short lateral incisions between setae s6 and S1, setae s2 on shield’s anterolateral margins ( Figures 1A View Figure 1 & 2A View Figure 2 ), with 33 pairs of setae, including 18 pairs on podonotal region j (1–6, z1–6, s1–6), including s2 on its anterolateral margins and 15

pairs on opisthonotal region, all marginal r -R -setae on soft cuticle, setae all of similar short,

smooth, except clunal setae (Z5) thicker, hardly ciliated and slightly longer than adjacent setae

( Figures 1A View Figure 1 , 2A & 2C View Figure 2 ). Lateral soft cuticle with about 12 of setae, r2–5 and R1–6, two or three submarginal UR’s posterolaterally and a pair of poroids idRp () ( Figures 1A View Figure 1 & 2A View Figure 2 ).

Ventral idiosoma — ( Figures 1B View Figure 1 , 2B, 2D, 2E & 2G View Figure 2 ) — Presternal region with a pair of smooth platelets which bear setae st1 ( Figures 1A View Figure 1 , 2B & 2D View Figure 2 ). Epigynal shield somewhat vase form, anterior margin of shield convex, not overlapping posterior area of sternal shield,

posterior margin truncate, protruding at level setae st5, paragenital poroids on soft cuticle beside posterolateral margins of epigynal shield ( Figures 1B View Figure 1 , 2B & 2G View Figure 2 ). Peritrematal shields anteriorly united with dorsal shield at anterior level of setae z1, and posteriorly united with parapodal strips behind coxae IV and exopodal fragments alongside coxae II-IV; shields bearing five pairs of discernible pore-like structures: two pairs of gland pores and three pairs of poroids, gv2 on soft cuticle behind coxae IV ( Figures 1B View Figure 1 & 2B View Figure 2 ). Opisthogaster with nine pairs of setae in addition to circumanal setae [not seven pairs which has been shown in the original description, see Yin and Bei 1991 ; this aspect was viewed as an exception to the diagnosis concept of the Leioseius genus by Moraes et al. (2016: 26)], ventrianal shield with three pairs of opisthogastric setae (excluding circumanals), Zv2, Zv3, Jv5 on adjacent soft cuticle (Figures

1B, 2B & 2E). Spermathecal system not discernible.

Gnathosoma — ( Figures 1C–E View Figure 1 , 5F View Figure 5 , 2H & 2I View Figure 2 ). Subcapitulum with seven rows of deutoster-

nal denticles, each similarly narrow, with five to ten denticles ( Figures 1C View Figure 1 & 2F View Figure 2 ); subcapitular setae h1 and h3 similar in length, clearly longer than capitular setae pc, and h2 setae ( Figure 1C View Figure 1

& 2F View Figure 2 ). Epistome trifid, with denticulate apices ( Figures 1D View Figure 1 & 2H View Figure 2 ). Fixed digit with tiny offset subapical tooth, short pilus dentilis and row of four or five well-spaced teeth; movable digit bidentate ( Figures 1E View Figure 1 & 2I View Figure 2 ).

Legs — ( Figure 3 View Figure 3 ). Legs II ( Figure 3B View Figure 3 ) and III ( Figure 3C View Figure 3 ) short, legs I ( Figure 3A View Figure 3 ) longer than legs IV ( Figure 3D View Figure 3 ), and shorter than dorsal shield. Complement of setae on leg segments for coxae I-II-III-IV: 2, 2, 2, 1; for trochanters: 6, 5, 5, 5; for femora: 12, 11, 6, 6; chaetotactic formulae for genua I-IV, respectively: (2-3/2, 3/1-2) (2-3/1, 2/1-2) (2-2/1, 2/1-1) (2-2/1, 3/0-1);

tibiae: (2-3/2, 3/1-2) (2-2/1, 2/1-2) (2-1/1, 2/1-1) (2-1/1, 3/1-2); genu I and tibia I with av-2

( Figure 3A View Figure 3 ), genu IV with nine setae, pd3 present ( Figure 3D View Figure 3 ); tibia III with al-2, without pl-2

( Figure 3C View Figure 3 ). Tarsi II–IV with 18 setae, all setae on tarsi II–IV similar in form and moderate length to most other tarsal setae; not differentiated in curved whip-like form, setae v-1 () and

(v-2) similar in form and moderate length to most other tarsal setae d- ; (2) not differentiated in curved whip-like form; (d-1) less than half as long as pretarsus to bases of claws; shape of setae on leg segments as Figures 3A–D View Figure 3 .