A Redescription of Thermocyclops uenoi (Crustacea, Copepoda)
Thermocyclops uenoi Ito, 1952, a poorlyknown groundwater species is redescribed based on the materials of collection Dr. T. Mizuno. A key to Japanese species of the genus Thermocyclops is provided.
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Інститут зоології ім. І.І. Шмальгаузена НАН України
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| Zitieren: | A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) / I.M. Mirabdullayev, H. Ueda // Вестн. зоологии. — 2001. — Т. 35, № 4. — С. 17-22. — Бібліогр.: 7 назв. — англ. |
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irk-123456789-95482010-07-05T12:01:34Z A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) Mirabdullayev, I.M. Ueda, H. Фауна и систематика Thermocyclops uenoi Ito, 1952, a poorlyknown groundwater species is redescribed based on the materials of collection Dr. T. Mizuno. A key to Japanese species of the genus Thermocyclops is provided. Thermocyclops uenoi Ito, 1952, малоизвестный подземный циклоп, переописан по материалам коллекции Т. Мицуно. Составлена таблица для определения видов рода Thermocyclops фауны Японии. 2001 Article A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) / I.M. Mirabdullayev, H. Ueda // Вестн. зоологии. — 2001. — Т. 35, № 4. — С. 17-22. — Бібліогр.: 7 назв. — англ. 0084-5604 http://dspace.nbuv.gov.ua/handle/123456789/9548 595.34 en Інститут зоології ім. І.І. Шмальгаузена НАН України |
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Фауна и систематика Фауна и систематика Mirabdullayev, I.M. Ueda, H. A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) |
| description |
Thermocyclops uenoi Ito, 1952, a poorlyknown groundwater species is redescribed based on the materials of collection Dr. T. Mizuno. A key to Japanese species of the genus Thermocyclops is provided. |
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Article |
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Mirabdullayev, I.M. Ueda, H. |
| author_facet |
Mirabdullayev, I.M. Ueda, H. |
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Mirabdullayev, I.M. |
| title |
A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) |
| title_short |
A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) |
| title_full |
A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) |
| title_fullStr |
A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) |
| title_full_unstemmed |
A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) |
| title_sort |
redescription of thermocyclops uenoi (crustacea, copepoda) |
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Інститут зоології ім. І.І. Шмальгаузена НАН України |
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2001 |
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Фауна и систематика |
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http://dspace.nbuv.gov.ua/handle/123456789/9548 |
| citation_txt |
A Redescription of Thermocyclops uenoi (Crustacea, Copepoda) / I.M. Mirabdullayev, H. Ueda // Вестн. зоологии. — 2001. — Т. 35, № 4. — С. 17-22. — Бібліогр.: 7 назв. — англ. |
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2025-07-02T12:49:44Z |
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2025-07-02T12:49:44Z |
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1836539534724038656 |
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Vestnik zoologii, 35(4): 17—22, 2001
© 2001 I. M. Mirabdullayev, H. Ueda
Последним работал: AL Ostashko/DIMA; E:\My Documents\Verstka\Vestnik\2001\N4\01_Mirabdullaev\mirabdul_vz.doc; Дата сохранения 8/13/2001 4:54:00 PM; 1 станиц(ы);
Ч 7226
UDC 595.34
A REDESCRIPTION OF THERMOCYCLOPS UENOI
(CRUSTACEA, COPEPODA)
I. M. Mirabdullayev1, H. Ueda2
1Institute of Zoology, Tashkent, 700095 Uzbekistan
E-mail: hydrobio@zool1.silk.org
2Center for Marine Environmental Studies, Ehime University, Bunkyo-cho 3, Matsuyama, Ehime 790-8577,
Japan
E-mail: hueda@dpc.ehime-u.ac.jp
Accepted 3 January 2001
A Redescription of Thermocyclops uenoi (Crustacea, Copepoda). Mirabdullayev I. M., Ueda H. –
Thermocyclops uenoi Ito, 1952, a poorlyknown groundwater species is redescribed based on the materi-
als of collection Dr. T. Mizuno. A key to Japanese species of the genus Thermocyclops is provided.
Key wo rd s : Copepoda, Thermocyclops uenoi, groundwater fauna, Japan.
Ïåðåîïèñàíèå Thermocyclops uenoi (Crustacea, Copepoda). Ìèðàáäóëëàåâ È. Ì., Óýäà Õ. – Thermo-
cyclops uenoi Ito, 1952, ìàëîèçâåñòíûé ïîäçåìíûé öèêëîï, ïåðåîïèñàí ïî ìàòåðèàëàì êîëëåêöèè
Ò. Ìèöóíî. Ñîñòàâëåíà òàáëèöà äëÿ îïðåäåëåíèÿ âèäîâ ðîäà Thermocyclops ôàóíû ßïîíèè.
Êëþ÷åâûå ñ ëîâà : Copepoda, Thermocyclops uenoi, ôàóíà ãðóíòîâûõ âîä, ßïîíèÿ.
Introduction
Genus Thermocyclops Kiefer, 1927 is one of the most important among Cyclopidae. Its representatives
inhabit various biotopes of various continental waterbodies, often dominating plankton communities.
There are 3 species of the genus Thermocyclops known from Japan: Thermocyclops taihokuensis Harada,
1931, T. crassus (Fischer, 1853), T. uenoi Ito, 1954 (Ito, Miura, 1973; Ueda, Ishida, 1997).
The last species was first described by Ito (1952) from a well in Sashiki Town, Kumamoto Prefecture,
Kyushu. It is one of the most poorly known species in the genus. Subsequent records of this species were
made only from a well in Sasaguri Town, Fukuoka Prefecture, Kyushu (Ito, 1957) and from wells in To-
mogashima Island in the Seto Inland Sea, Wakayama Prefecture (Mizuno, 1957). Dr. T. Mizuno kindly
gave one (HU) of us all his samples that he collected during his study. We found T. uenoi in his collection
from Tomogashima Island and redescribe it in this note.
Material
Ten females and 3 males from a well in Tomogashima Island, Japan. 21.11.1954. Mizuno’s collection.
All drawings have been made using a camera lucida. Designation of furcal setae are given according Dussart
and Defaye (1995).
Results
Thermocyclops uenoi Ito, 1952 (fig. 1—24)
Female . Body length 950—1100 μm. Body widest at cephalothorax (fig. 1). Lat-
eral sides of fifth toracic somite without ornamentation (fig. 2). Genital somite about
as long as wide. Well developed lateral wings of receptaculum seminis slightly curved
posteriorly (fig. 2). Anal somite with well developed operculum and 2 groups of 12—
16 spinules on posterior ventral margin (fig. 3—4).
Furcal rami 3.5—4.3 times as long as wide, with 4 groups of hairs on inner sur-
face (fig. 4). Implantations of Me and Te furcal setae not provided with spinules. Me
I. M. Mirabdullayev, H. Ueda 18
is situated at 69—70% of length of furcal rami. Ti about as long as furcal rami and sig-
nificantly longer than Te and Sd furcal setae (fig. 4). Tips of Tmi are straight.
Antennules relatively short, reaching the middle of second thoracic somite, 17-
segmented, armored as follows (segment number in Roman numerals, setal number in
arabic numerals, sp = spine): l(8)—II(4)—III(2)—IV(6)—V(4)—VI(1+sp)—VII(2)—
VIII(1)—IX(1)—X(0)—XI(1)—XII(1+aesth)—XIII(0)—XIV(1)—XV(2)—XVI(2+aesth)—
XII(8+aesth) (fig. 5). Last antennular segment about as long as the penultimate seg-
ment. Lateral setae of the last segment is situated at middle of length of the segment.
Aesthetasc on 12th segment long, protruding beyond distal margin of 14th segment. Last
and penultimate segments bear hyaline membranes. Basipodite of antenna bearing
3 setae. Its ornamentation as on figures 6, 7. There are rows and fields of tiny spinules
on caudal side of basipodite. The endopod is 3-segmented. Its first segment is armed
with 1 outer seta at midlength and bears a row of spinules at the outer margin. Second
Fig. 1—4. Thermocyclops uenoi, }: 1 – habitus; 2 – last thoracic and genital somites; 3 – furcal ramus ven-
trally; 4 – furcal ramus dorsally. Scales: 100 μm.
Ðèñ. 1—4. Thermocyclops uenoi, }: 1 – ãàáèòóñ; 2 – ïîñëåäíèé òîðàêàëüíûé è ãåíèòàëüíûé ñåãìåíòû;
3 – ôóðêà ñ áðþøíîé ñòîðîíû; 4 – ôóðêà ñî ñïèííîé ñòîðîíû. Ìàñøòàá: 100 ìêì.
Ïåðåîïèñàíèå Thermocyclops uenoi (Crustacea, Copepoda) … 19
segment of antenna bearing 9 setae and third segment bearing 7 setae terminally and
row of spinules on outer rim.
Morphology of mandible and maxillule as on figures 8, 9. Maxillulary palp bearing
tiny spinules on outer side (fig. 10). Maxilla with praecoxa, coxa, basis and 2-
segmented endopod. Shortest seta of movable endite of coxa is 0.7—0.8 times as long
as the longest seta (fig. 11). Maxilliped with syncoxa, basis, and 2-segmented endopod
(fig. 12). Length ratio between two shortest setae is 1.20—1.25.
Thoracic legs with 3-segmented rami. Spine formula of exopodis P1—P4: 2.3.3.3;
setae formula: 4.4.4.4 (fig. 13—16). Inner margin of P1 basipodite with long seta reach-
ing P1enp3. Inner margins of P1—P3 basipodites bearing setules, these of P4 devoid of
setules but bearing tiny spinules on caudal surface. Connecting plate of P1 with
smooth surface. Connecting plates of P2—P4 bear long spinules on caudal surface.
Fig. 5—11. Thermocyclops uenoi, }: 5 – antennule; 6 – antenna, frontal side; 7 – basipodite of antenna, caudal
side; 8 – mandible; 9 – maxillule; 10 – maxillular palp; 11 – maxilla; 12 – maxilliped. Scales: 50 μm.
Ðèñ. 5—11. Thermocyclops uenoi, }: 5 – àíòåííóëà; 6 – àíòåííà, ôðîíòàëüíàÿ ñòîðîíà; 7 – áàçèïîäèò
àíòåííû, êàóäàëüíàÿ ñòîðîíà; 8 – ìàíäèáóëà; 9 – ìàêñèëóëà; 10 – ùóïèê ìàêñèëóëû; 11 – ìàêñèëëà;
12 – ìàêñèëëèïåäû. Ìàñøòàá: 50 ìêì.
I. M. Mirabdullayev, H. Ueda 20
Connecting plates of P1—P3 bearing low rounded prominences armed with 3—
7 spinules. Coupler of P4 without prominences but bearing at its place 3 spinules on
frontal surface. Inner spine of P4enp3 slightly shorter than the segment and 1.4—
1.6 times longer than outer spine.
P5 of morphology typical for the genus Thermocyclops (fig. 2). Inner spine of sec-
ond segment of P5 1.5—1.6 times as long as outer seta.
Male . Body length 860 μm. Anal somite with well developed operculum and
many spinules on posterior ventral margin (fig. 18). Furcal rami 4.3 times as long as
Fig. 13—14. Thermocyclops uenoi, }: 13 – P1; 14 – P2. Scale: 100 μm.
Ðèñ. 13—14. Thermocyclops uenoi, }: 13 – P1; 14 – P2. Ìàñøòàá: 100 ìêì.
Tab l e 1 . Data of measurements of Thermocyclops uenoi
Òàáëèöà 1 . Îñíîâíûå ïðîìåðû Thermocyclops uenoi
Mizuno collection Tomogashima Isl.*
Data
min±max x
Ito, 1954
min±max
Ito, 1957**
min±max
Body length, µm 950—1100 1040 750—1200 1200—1290
Caudal rami L/W 4.00—4.30 4.19 3.50—4.60 3.70—4.10
Ti/caudal rami L 0.90—1.02 0.95
Ti/Tmi 0.26—0.28 0.27 0.25—0.31
Ti/Te 0.35—0.38 0.36 0.36—0.39
Ti/Te 1.36—1.54 1.45 1.30—1.80 1.40—1.50
Ti/Sd 1.62—1.84 1.62 1.59—1.80
P4enp3 L/W 2.33—2.60 2.46 2.00—2.70 2.10—2.50
P4enp3 med.sp/L 0.87—0.96 0.93 0.88—0.95 0.89—1.00
P4enp3 med.sp/lat.sp 1.38—1.55 1.46 1.40—1.80 1.40—1.50
P5 med.sp/lat.seta 1.50—1.59 1.53
* n=10
** n=5
Ïåðåîïèñàíèå Thermocyclops uenoi (Crustacea, Copepoda) … 21
wide, with smooth inner surface. Implantations of Te furcal setae provided with
spinules. Tips of Ti strongly curved ventrally (fig. 17).
Antennules as on figure 19. Endopodite 2 of antenna bearing 8 setae (fig. 20).
Connecting plate of P4 bearing spinules on frontal and caudal sides (fig. 21). In-
Fig. 15—16. Thermocyclops uenoi, }: 15 – P3; 16 – P4. Scale: 100 μm.
Ðèñ. 15—16. Thermocyclops uenoi, }: 15 – P3; 16 – P4. Ìàñøòàá: 100 ìêì.
Fig. 17—24. Thermocyclops uenoi, {: 17 – habitus; 18 – furcal ramus ventrally; 19 – antennules; 20 – endo-
podite 2 of antenna; 21 – connecting plate of P4; 22 – P4enp3; 23 – P5; 24 – P6. Scales: 17 – 100 μm; 18,
23, 24 – 50 μm;20, 21, 22 – 25 μm.
Ðèñ. 17—24. Thermocyclops uenoi, {: 17 – ãàáèòóñ; 18 – ôóðêà ñ áðþøíîé ñòîðîíû; 19 – àíòåííóëà;
20 – ýíäîïîäèò 2 àíòåííû; 21 – ñîåäèíèòåëüíàÿ ïëàñòèíêà P4; 22 – P4enp3; 23 – P5; 24 – P6. Ìàñ-
øòàá: 17 – 100 ìêì; 18, 23, 24 – 50 ìêì; 20, 21, 22 – 25 ìêì.
I. M. Mirabdullayev, H. Ueda 22
ner spine of P4enp3 1.6 times longer than outer spine (fig. 22). Inner spine of second
segment of P5 slightly longer than outer seta (fig. 23). Inner spine of P6 1.4 times
shorter than outer seta and about twice as long as outer seta (fig. 24).
The biometrical data are given in table 1.
Discussion
Morphology of specimens mainly studied corresponds to description given by
Ito (1952, 1954). However specimens from Sasaguri Town determined by him as
T. uenoi (Ito, 1957; Ito, Miura, 1973) differ from specimens studied by us. Females
from Sasaguri Town have additional row of setules on caudal side of connecting plate
of P4 (Ito, 1957: fig. 56), males have innermost spine of P6 shorter than the medial
seta (Ito, 1957: fig. 63, 65).
Thermocyclops uenoi belongs to the Thermocyclops schmeili species group. Thermo-
cyclops uenoi is probably most close to Thermocyclops operculifer Kiefer, 1930, differing
by hairy furcal rami, longer spine-like seta on inner margin of basis of P1, relatively
longer Ti furcal seta.
Thermocyclops uenoi is easely distinguished from congeners from Japan by hairy
furcal rami and by morphology of connecting plate of P4.
Key for determination of the Thermocyclops species of Japan
Êëþ÷ äëÿ îïðåäåëåíèÿ âèäîâ ðîäà Thermocyclops èç ßïîíèè
1. Female furcal rami with hairs on inner surface, P4 connecting plate without prominences. ..........
.......................................................................................................................... Thermocyclops uenoi
— Furcal rami with smooth inner surface, P4 connecting plate bearing rounded prominences armed
with spinules. ................................................................................................................................. 2
2. Tips of Tmi strongly curved, lateral wings of receptaculum seminis not curved posteriorly. ….
........................................................................................................................Thermocyclops crassus
— Tips of Tmi straight, lateral wings of receptaculum seminis curved posteriorly. .............................
................................................................................................................Thermocyclops taihokuensis
Acknowledgement
We are grateful to Dr. T. Mizuno for kindly giving us his collection.
Dussart B. H., Defaye D. Introducction to the Copepoda. Guides to the identification of the Microinverte-
brates of the Continental Waters of the World. – SPB Acad. Publ, 1995. – 7. – 277 p.
Ito T. Four new copepods from subterranean waters of Japan // Report Faculty Fish., Prefect. Univ. Mie. –
1952. – 1. – P. 115—120.
Ito T. Cyclopoida copepods of Japanese subterranean waters // Report Faculty Fish., Prefect. Univ. Mie. –
1954. – 1. – P. 72—417.
Ito T. Groundwater copepods from south-western Japan // Hydrobiologia. – 1957. – 11. – P. 1—28.
Ito T., Miura Y. Subclass Copepoda // Nihon Tansui eibutsugaku. – Tokyo : Hokuryuukan, 1973. –
P. 434—454 (in Japanese).
Mizuno T. Limno-biological studies of some groups of freshwater ponds on the coast of the Inland Sea (or
Seto-Naikai) in Japan // Mem. Osaka Univ. Liberal Arts & Educ., B. Nat. Sci. – 1957. – N 6. –
P. 74—86.
Ueda H., Ishida T. Species composition and description of limnoplanktonic copepods from Okinawa //
Plankton Biol. Ecol. – 1997. – 44. – P. 41—54.
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