Table Of Content` Department of Zoology
, Faculty of Biology, National University of Mongolia,
Ulaanbaatar, 210646 Mongolia
2 College of Agriculture
, Wonkwang University, Iksan, 570-749 Korea
3 Kanagawa Prefectural Museum of Natural History
, Odawara, 250-0031 Japan
Acta Arachnologica, 50(1); 15-20, September 28, 2001
A new damaeid mite of the genus Dyobelba
(Acari: Oribatida: Damaeidae) from Korea
Badamdorj Bayartogtokh', Seong-Sik Choi2 & Jun-ichi Aoki3
Abstract - A new species of oribatid mite belonging to the genus Dyobelba is described from Korea.
Dyobelba paucituberculata sp. nov. can be distinguished from the other species of Dyobelba by the complete
absence of prodorsal enantiophyses B, D, epimeral and dorsosejugal enantiophyses E2, V and discidium, the
presence of microtubercles at the bases of epimeral setae of 1, 2, 3-series and 4b, and the presence of two setae
on trochanter IV. Some information on generic diagnosis and distribution of hitherto known species of
Dyobelba are given.
Key words - Oribatida, Damaeidae, Dyobelba, new species, Korea
Notogastral width refers to the maximum width in dorsal
Introduction aspect. Hysterosomal dorso-ventral thickness is meas-
ured in lateral aspect, from the edge of the ventral plate
The oribatid mite genus Dyobelba was established by to the dorsal edge of the notogaster in postgenital
Norton (1978) with Oribata carolinensis Banks 1947 as transect. Notogastral thickness is measured in lateral as-
the type species. Members of this genus are known pri- pect, from the dorsal to the ventral edge of the notoga-
marily from litter of various types of forests, mosses, de- ster. Length of leg segments is measured in lateral
caying wood and organic horizon of soils. At the present aspect, and includes the portion inserted into the next
moment five species (D, armata Norton, D. biclavata segment.
Wang & Norton, D. carolinensis (Banks), D. reevesi
Norton & Ryabinin and D. tectopediosa (Jacot)) are Genus Dyobelba Norton 1978
known and they are distributed in the United States
(Jacot 1938; Banks 1947; Norton 1978; Marshall et al. Tibiae II and III each with associated seta d coupled
1987; Norton & Ryabinin 1994), Chile (Norton 1979), with solenidion cp(in a single species D. reevesi Norton
China (Wang & Norton 1993) and Mongolia (Bayartog- & Ryabinin, seta d lacking on tibia II); trochanter IV
tokh 2000). with one or two setae; femora III and IV mostly with 4
In the present work a new species, Dyobelba setae on each (five setae in D. biclavata); prodorsal
paucituberculata sp. nov. is described from Korea, and enantiophyses B and D usually present, but completely
it is the second representative of Dyobelba recorded absent in D. paucituberculata sp. nov.; spinae adnatae
from Palaearctic Region. mostly present (absent only in D. armata); propod-
The morphological terminology used in this paper is olateral apophyses P mostly absent, but rarely present;
based on that (with a few modifications) developed by ventral enantiophyses S present; discidium present, but
Grandjean (1960) as applied by Norton (1978). Body absent in D. paucituberculata sp. nov.; epimeral setal
length is measured in lateral view, from the tip of the formula 3-1-3-4 or 3-3-3-4.
rostrum to the posterior edge of the ventral plate, to In a recent classification of the oribatid mite genera,
avoid discrepancies caused by different degrees of Balogh & Balogh (1992) considered that spinae adnatae
notogastral distension. Notogastral length is measured in are absent in Dyobelba. However, most of the known
lateral aspect, from the anterior to the posterior edge. species of this genus (other than D. armata) have
16 B. Bayartogtokh et al.
conspicuously developed spinae adnatae, which are di- acters of Dyobelba. Propodolateral apophysis P absent;
rected anteromediad or anterolaterad. tubercles of prodorsal enantiophyses B and D completely
absent; all prodorsal setae smooth, except only very
Dyobelba paucituberculata sp. nov. finely barbed lamellar seta; sensillus very long, thin,
(Figs. -3) smooth, flagellate distally; notogastral setae short, thin,
smooth, lighter on color; spinae adnatae moderate in
Diagnosis. Medium sized species with general char- size, directed anteroventrad; tectum of podocephalic
Fig. 1. Dyobelba paucituberculata sp. nov., holotype. A: Dorsal view; B: Lateral view.
Acta Arachnologica, 50(1), September 2001 OArachnological Society of Japan
A new Dyobelba from Korea 17
fossa not projected; ventral enantiophyses E2 and V notogaster 324-348 ,um; width of notogaster 292-328
completely absent; enatiophysis S well developed; ,1m; dorsoventral thickness of hysterosoma 264-272 ,im.
epimeral regions II and III with three setae on each and Integument. Body color yellowish brown. Surface of
IV with four setae; epimeral setae of 1, 2, 3 -series and body and leg segments with very thick granular
4b situated on distinctly developed microtubercles; cerotegument. Conspicuous microtubercles present on
discidium absent; setae d on genua I-III slightly longer prodorsum and around leg acetabula. Adherent debris or
and thicker than their coupled solenidia a; solenidia cp of exuvial scalps absent.
tibiae II and III slightly shorter than their associated Prodorsum. Rostrum rounded in dorsal view, but
setae d ; trochanter IV with two setae. conspicuously projected in lateral view. Rostral seta
Measurements. Body length 476-512 ,um; length of (ro) medium long, relatively thick, smooth. Lamellar
Fig. 2. Dyobelba paucituberculata sp. nov., holotype. A: Ventral view; B: Leg I ( right, antiaxial aspect); C:
Leg II (right, antiaxial aspect); D: Leg III (right, antiaxial aspect); E: Leg IV (right, antiaxial aspect)
Acta Arachnologica, 50(1), September 2001 OArachnological Society of Japan
18 B. Bayartogtokh et al.
seta (le) slightly longer and thicker than ro, with very of notogaster 160-176 ,i m; dorsal contour evenly
fine barbs on its lateral margin. Interlamellar seta (in) rounded. Spinae adnatae (sa) moderate in size, in dorsal
relatively short, smooth, directed posterolaterally. aspect directed anteromediad, but in lateral aspect
Exobothridial seta (ex) thin, nearly as long as in. strongly curved anteroventrad; distance between their
Sensillus (ss) thin, smooth, very long, finely attenuate bases nearly as long as that of notogastral setae la-la.
and strongly flagellate distally. Bothridium (bo) irregu- Notogastral setae short, thin and smooth, not darkly pig-
lar funnel-shaped, directed posterolaterad. Tubercles of mented, but lighter in color. Notogastral lyrifissures ia,
prodorsal enantiophyses B and D completely absent. im, ih, ip, ips and opisthosomal gland opening (gla) well
Propodolateral apophysis P absent (Figs. 1A, 3A & B). visible in lateral view (Figs. lA, B, 3A, C & D).
Notogaster. Almost circular viewed perpendicular to Gnathosoma. Infracapitular mentum slightly wider
circumgastric scissure, nearly as long as wide. Thickness than long, with a few microtubercles. Hypostomal setae
Fig. 3. Dyobelba paucituberculata sp. nov. A: Dorsal view; B: Lateral view; C: Dorsosejugal region, spina
adnata and interlamellar seta are indicated by arrow; D: Posterior view of notogaster (cerotegument partly re-
moved), seta h3 is indicated by arrow.
Acta Arachnologica, 50(1), September 2001 OArachnological Society of Japan
A new Dyobelba from Korea 19
h, m and a medium long, all of them thin, smooth (Fig. University, Korea. Three paratypes (alcohol preserved)
2A). Chelicera normal, fixed and movable digits with a are deposited in the acarology collection of the National
few blunt teeth. Tragardh's organ narrow; setae cha and Science Museum, Tokyo, Japan and one paratype is de-
chb conspicuously barbed. Palp normal, palpal setation: posited in the collection of the Department of Zoology,
0-2-1-3-9 including solenidion w on tarsus. National University of Mongolia, Ulaanbaatar, Mon-
Epimeral region. Tectum of podocephalic fossa not golia.
projected, but slightly rounded under trochanter I. Remarks. Dyobelba paucituberculata sp. nov. is eas-
Epimeral enantiophysis E2 and ventrosejugal enantio- ily distinguishable from any other species of Dyobelba
physis V completely absent. Parastigmatic enantiophysis by the complete absence of the prodorsal enantiophyses
S well developed, tubercles Sa and Sp subtriangular; dis- B, D, epimeral and dorsosejugal enantiophyses E2, V
tal projection of anterior tubercle Sa very slightly longer and discidium, the presence of microtubercles at the
than that of Sp. Discidium (di) completely absent. bases of epimeral setae of 1, 2, 3-series and 4b, and the
Epimeral setae medium long; setae la, 1 b, 1 c, 2a, 2b, presence of two setae on trochanter IV. The other mem-
2c, 3a, 3b, 3c and 4b situated on distinctly developed bers of this genus have at least one pair of tubercles on
microtubercles. Epimeral region II with three setae; the prodorsum and epimeral region, well-developed
epimeral setal formula: 3-3-3-4 (Fig. 2A). discidium and only one seta on trochanter IV.
Ano-genital region. Structure normal for genus; ano- In spite of these principal diagnostic features, the
genital setae medium long, smooth. Adanal lyrifissure new species is somewhat resemble D. biclavata, de-
(iad) situated obliquely, at level slightly anterior to anal scribed by Wang and Norton (1993) from China in two
setae ant. Genital plates with a few microtubercles (Fig. characters. In the original description of D. biclavata,
2A). one pair of epimeral tubercles E2a is indicated as Ta
Legs. Length measurements of leg segments are (Wang & Norton 1993). Such tubercles, however, are
shown in Table 1. Distal tectum of trochantera III and IV not found in the Mongolian specimens (Bayartogtokh,
very poorly projected. Setae d on genua I-III slightly 2000). Another similar character is the presence of
longer and thicker than their coupled solenidia a; neotrichous setae (3 pairs) on epimeral region II of both
solenidia cP of tibiae II and III slightly shorter than their the species. However, the new species can be clearly dif-
associated setae d. Formula of leg setation (including ferentiated from D. biclavata in the 1) very long and dis-
famulus): I (1-7-4-4-20); II (1-6-4-5-17) III (2-4-3-4- tally flagellate sensilli as opposed to relatively short and
17); IV (2-4-3-3-14); formula of solenidia: I (1-2-2); II straight sensilli in D, biclavata; 2) anteromedially di-
(1-1-2); III (1-1-0); IV (0-1-0). Structure and setation of rected spinae adnatae as opposed to anterolaterally
legs I-IV as shown in Figs. 2B-2E. curved spinae adnatae in D. biclavata, 3) laterally situ-
Material examined. Holotype: Cheonwang-bong ated notogastral setae c,, h, and h2 as opposed to medi-
(1915 m above sea level; the top of Mt. Jurisan), ally situated setae in D. biclavata; 4) centrally situated
Sancheong-gun, Kyungsang Nam-do, southern Korea, aggenital setae as opposed to laterally removed setae ag
04 October, 1997. Forty-seven paratypes: same data as in D, biclavata, 5) presence of two and four setae on
holotype. Thirty-four paratypes: Baikrockdam (1950 m trochanter IV and femora III, IV, respectively as op-
above sea level, the top of Mt. Hallasan), Cheju-do posed to one and five setae in the respective segments of
(southernmost island of Korea), 16 October, 1997, Leg. D, biclavata, and 6) much smaller body size.
S. S. Choi. The holotype and 76 paratypes (alcohol pre- Etymology. The specific name combining "pau-ci"
served) are deposited in the collection of the Laboratory and "tuberculum" is taken from the Latin meaning `few
of Plant Protection, College of Agriculture, Wonkwang or little' and `tubercle', respectively, and refers to the
complete absence of tubercles of the prodorsal and ven-
tral enantiophyses B, D, E2 and V and presence of only
Table 1. Length of leg segments of Dyobelba xparastigmatic tubercles Sa and Sp.
vaucituberculata sp. nov. (mm)
Acknowledgments
We would like to express our thanks to Prof. R. A.
Norton, State University of New York, Syracuse, USA for
obtaining us copy of Jacot's paper and for the loan of
Acta Arachnologica, 50(1), September 2001 OArachnological Society of Japan
20 B. Bayartogtokh et al.
specimens of D. tectopediosa Jacot for comparative study. Marshall, V. G., R. M. Reeves & R. A. Norton, 1987. Cata-
This study was partly supported by the Japan Society for the logue of the Oribatida (Acari) of Continental United St-
Promotion of Science. ates and Canada. Mem. Ent. Soc. Canada, 139: 1-418.
Norton, R. A., 1978. Generic concepts in the Damaeidae
(Acari: Oribatei). I. Three new taxa based on species of
References
Nathan Banks. Acarologia, 20 (4): 603-622.
Norton, R. A., 1979. Damaeidae (Acari: Oribatei) collected
Balogh, J. & P. Balogh, 1992. The Oribatid Mites Genera
by the Hungarian Soil Zoological Expeditions to South
of the World. Vol. 1. 263 pp. Hungarian National Mus- America. Folia. Ent. Hung., 32 (1): 55-64.
eum Press, Budapest.
Norton, R. A. & N. A. Ryabinin, 1994. New alpine dama-
Banks, N., 1947. On some Acarina from North Carolina. eid mite (Acari: Oribatida) from New Hampshire, USA.
Psyche, 54: 110-141. 35 (4): 373-380.
Bayartogtokh, B., 2000. Two species of damaeid mites Wang, H. & R. A. Norton, 1993. A new species of the
(Acari: Oribatida: Damaeidae) from Mongolia, with no-
genus Dyobelba from China (Acari: Oribatida: Dama-
tes on distribution of the genera Epidamaeus and eidae). Acta Zootaxon. Sin., 18 (1): 66-69. (In Chinese
Dyobelba. Biogeography, 2: 67-79. with English summary)
Grandj ean, F., 1960. Damaeus arvernensis n. sp. (Oribate).
Acarologia, 2 (2): 250-275.
Acceped Janunary 31, 2001 /Accepted March 2, 2001
Jacot, A. P., 1938. Some new Western North Carolina
moss-mites. Proc. Ent. Soc Wash., 40 (1): 10-14.
Acta Arachnologica Vol.50, No.1掲 載 論 文 の 和 文 要 旨
トリノフンダマシはガを誘引 しない(PP.1-4) バヤル トグ トホ バ ダム ドル ジ1,崔 星植 2,青 木淳
-3(1 モンゴル国立大学生物学部動物学研究室;2 圓光
宮下 直 1,坂 巻祥孝 2,新 海 明 3(1〒113-8656文 京
区弥生1-1-1東 京大学大学 院農学生命科学研究科; 大学校農科大学;3 神奈川県立生命の星 ・地球博物館)
2〒890 -0065鹿 児島市郡元1-21-240鹿 児 島大学農学
韓国よ り得 られたDyobelba属 の1新 種を記載 した.
部;3〒192-0352八 王子市大塚274-29-603) Dyobelba paucituberculatasp. nov.は,次 の点 によって
トリノフンダマシ類は,お もにガを捕食することが 同属の他種か ら区別 される:前 体部背面 隆起(prodor-
知 られている.こ れらのクモがナゲナワグモのように sal enantiophyses)B, D,腹 面内隆起(epimeral and dor-
特定の雄のガを誘引しているかを確かめるため,ク モ sosejugal enantiophyses).E2, V,お よ び 脇 突 起
に捕獲されたガと飛翔中のガを採集 し種組成と性比を (discidium)を 完全 に欠 くこと,基 節板毛 の数本(第
調べた.餌 となったガはさまざまな種の雌雄から構成 1− 第3列D,お よび4b)の 基部 に微小突起 を持つ こ
されており,性 比は0.77で 雌に偏っていた.ま た, と,第IV脚 転節 に2本 の毛を持つ こと．Dyobelba属
餌となったガと飛翔中のガの性比に違いはみられなかっ の識別点およびこれまでに知 られている本属の分布 に
た.し たがって,ト リノフンダマシ類は特定の雄のガ つ いて記述 した.
を誘引していないと考えられる.
台湾初記録 のカワ リア シダカグモ属(新 称),コ アシ
タニマノドヨウグモの放置網における円網を張るクモ ダカグモ属,ミ ナ ミアシダカグモ属および4新 種 の記
2種 の盗み寄生的行動(pp.5-11) 載(ク モ綱:ク モ目)(pp.23-31)
吉田 真(〒525-8577滋 賀県草津市野路東1-1-1 P. Jager 1,小 野展 嗣 2(1 Institut fur zoologie, Johannes
立命館大学理工学部生物工学科) Gutenberg-Universitat, Mainz, Germany; 2〒169-0073
タニマノ ドヨウグモの放置網における円網を張るク 東京都新宿 区百人町3-23-1国 立科学博物館動物研
モの盗み寄生的行動を調査するため寄主の網にかかる 究部)
昆虫の数を調べた.ア シナガグモ(体 長3-9mm)と 台湾か らア シダカグモ科の4新 種を以下のように命
タニマノ ドヨウグモの幼体(1-1.5mm)が 早朝 に寄 名 して 記 載 した:Pseudopoda serrata, Pseudopoda
主が不在の網に侵入 した.侵 入者の盗みによって放置 recta, sinopoda exspectata, Olios scalptor.こ れ ら3属
網上の昆虫の数は午前中に急速に減少 した.侵 入者の と も台 湾 か ら初 記 録 とな る.ま た ア シダ カ グ モ
個体数は徐々に増加 し,午 後にはそれらのほとんどは Heteropoda venatoria(Linne 1767)の1採 集記録 も報
放置網の中に小さい網を構築 した.大 型の侵入者は小 告 した.
型の侵入者を追い出し,よ り多くの昆虫を獲得 した.
寄主による防衛がないので,放 置網における餌盗みは 日本産 のモ リヒメグモ属,ハ ガタグモ属,カ ガ リグモ
餌獲得には効果的な戦略かもしれない. 属 および オオ ノ ヒメグモ属(ク モ目:ヒ メグモ科)
(pp.33-51)
南西諸島産コガネヒメグモ属およびツリガネヒメグモ 吉 田 哉(〒990-2484山 形市篭田2丁 目7番16号)
属(ク モ目:ヒ メグモ科)の2新 種(pp.13-16) 日本産のヒメグモ科モ リヒメグモ属,ハ ガタグモ属,
吉田 哉(〒990-2484山 形市篭田2丁 目7番16号) カガ リグモ属およびオオノヒメグモ属に検討 を加え,
南 西 諸 島産 の ヒメ グ モ科 の2新 種 を,Chrysso これ ら4属 に含 まれ る17種 に検索表 および簡単 な記
sasakiiオ キナワホシ ミドリヒメグモ(新 称,沖 縄島, 載を与 えた.北 海道大雪山高 山雪 田群落で採集 された
屋久島産)お よびAchaearanea projectivulvaト ガ リヒ モ リヒメグモ属 の1新 種Robertus yasudai new species
メグモ(新 称,沖 縄島産)の 名前で記載 した. (ヤ ス ダモ リヒメグモ,新 称)を 記載 し,中 国産のEn-
oplognatha lordbsa Zhu & Song 1992(コ ガタコノバ グ
韓 国よ り得 られたDyobelba属 の1新 種(ダ ニ亜綱: モ,新 称)を 日本か ら新た に記録 した.Enoplognatha
ササ ラダニ目:ジ ュズダニ科)(pp.17-22) abrupta (Karsch 1879)new combination(カ レハ ヒメ
Acta Aracknologica,50(1),September 2001 (CA)r achnologicalS ociety of Japan
