3 If . f TJ.$JfR, Sci. Rep. Hokkaido Salmon Hatchery, (41) : 77-119(1987)

Freshwater Harpacticoid Copepodsof Hokkaido, Northern Japan
Teruo ISHIDA*
Until twenty years ago, the study of freshwater harpacticoid copepods in Japan had been
mainly restricted to the subterranean species (e.g. Chappuis 1929, '55, '58 and Miura 1962, '64).
Some of the common surface water species were described sporadically by Brehm (1927).
Unfortunately as his description was inadequate, considerable confusion was introduced.
During the past decade, some taxonomists have begun to pay attention to the surface water
species. The occurrence of Harpacticella paradoxa (Brehm) in Nikko was reported by It6 andKikuchi (1977), Canthocarnptus mirabilis Sterba from Sapporo by It6 and Takashio (1980),
Elaphoidella grandidieri (Guerne et Richard) in Itako by Kikuchi (1985), and so on. I myself
began a preliminary faunistic survey of the surface freshwater Harpacticoida in Japan (Ishida
1981, '82, '83, '84a and b). At the present stage of my study, I have identified specimens of
harpacticoid fauna mostly in Hokkaido, northern Japan. In the present paper, I try tosummarize the distribution of 29 species in Hokkaido, and offer some suitable illustrations fordiagnosis.
Ninety samples from various'parts of Hokkaido were collected and supplied by Dr.
Tomiko Ito, Hokkaido Fish Hatchery, as a by product of her study of Trichoptera, and 130
samples came from my own collection.
My sampling method in the field followed a simple procedure. With the aid of a fine mesh(xx 13) hand net, I collected moss, leaf litter, mud and gravel from the water, and placed thematerial in a bucket already filled with water. Once the collected matter had been stirred andwashed fully, it was passed through a coarse sieve to eliminate coarse matters, and sieved by
the hand net. The material thus obtained, plus a small amount of water and formalin, was put
into a polyethylen bag. In the laboratory, all suspensive fine detritus and sedimentary mineral
granules were removed by the mining pan method from the animals in the water. The animals
were then placed under a stereomicroscope, and collected by handsorting.
The following speces were found in the samples examined : 1. Harpacticella paradoxa (Brehm)
2 . Canthocamptzts staphylinus (Jurine)
3 . Canthocamptus mirabilis StEtrba
4 . Canthocarnptus sp. I1
5. Mesochra rapiens (Schmeil)
6 . Mesochra alaskana Wilson
7 . Attheyella idahoensis (Marsh)&%t 3 1-f . 2k tAft%isfR%$5%3047* Hakkaido Salmon Hatchery, Fisheries Agency of Japan, 2-2 Nakanoshima, Toyohira-ku, Sapporo 062
JAPAN (;6EEG% : 7kEEAL&Z? If . &$J.k%)77

Ishida8 . Attheyella nakuii (Brehm)
9. Attheyella crmsa (Sars)
10. Attheyella orientalis Chappuis
11. Attheyella sp. M
12. Attheyella dentata (Poggenpol)
13. Attheyella nordenskjoldii (Lilljeborg)
14. Muruenobiotus vejdovskyi Mrazek
15. Muruenobitus brucei (Richard)
16. Gulcamptus sp.S
17. Epactophanes richardi Mrgzek
18. Morariu poppei (MrBzek)
19. Morariu duthiei (T.& A. Scott)
20. Moraria vam'ca (Graeter)
21. Moruriu sp. B
22. Bryocumptus zschokkei (Schmeil)
23. Bryocumptus vejdovskyi (MrBzek)
24. Bryocamptus Zuccophilus (Kessler), female only
25. Bryocumptus hiemulis (Pearse)
26. Bryocumptus culvus (Brehm)
27. Bryocamptus nivalis (Willey)
28. Elaphoidella bidens (Schmeil), female only
29. Purucamptus reductus Wilson
In the present study, the peristomial character was minutely analysed, and following items
were examined : 1) the distribution of spines and spinules as well as serrelation in each bodysegment ; 2) the ornamental character of legs and anal operculum ; 3 ) morphometrical differences of leg segments. The references in the synonymy list include an original description, themonographs esaily available in Japan and other papers related to Asia and North America.

Abbreviations : The following abbreviations are used in plates ; Cph =Cephalotholax,
Md&mandible, Pl-P6= legs 1-6, Exp=exopodite, Emp=endopodite, Abd=abdomen, F u =caudal rami, and parts around them, f=female, m=male.

78

Freshwater Harpacticoid Copepods of Hokkaido, Northern Japan

1. Ha@acticellu paradoxa (Brehm, 1924)(Plate 1)

Handeliellu paradoxa Brehm, 1924, p. 99 (not consulted).
Harpacticella paradoxa (Brehm). Lang, 1948, p. 343 ; It6 and Kikuchi, 1977, p. 70 ; Taiand Song, 1979, p. 180.
Materials illustrated: Nikko, Tochigi Pref., HonshQ (36"44'N, 139"31'E), 24 Nov. 1979, maleand female.
Remarks : Two females of this species were taken at a small stream in a forest of Tokachi
Plane (42"47'N, 143"09'E), 5 July 1983.
2 . Canthocamptus stuphylinus (Jurine, 1820)(Plate 2)
Monoculus staphylinus Jurine, 1820 p. 74 (not consulted).
Canthocamptus staphylinus (Jurine). Gurney, . 1932, p. 94 ; Lang, 1948, p, 923 ;Borutskii, 1952, p. 156 ; Dussart, 1967, p. 246 ; Ishida, 1981, p. 36 ; Miura, 1984, p.
512.
Materials illustrated : Chitose, Hokkaido (42"49'N, 141"33'E), 8 May 1981, male and female ;Lake Takkobunuma (43"07'N, 144"30'E), 11 June 1984, female.
Remarks : This species is very common in the shallow lakes, ponds, ditches, and lowland
rivers and streams in Hokkaido. As well known, the species has variable ornamental character of anal operculum and shape of caudal rami by individuals.
3 . Canthocamptus mirabilis StCrba, 1968
(Plate 3)

Canthocamptus mirabilis Stgrba, 1968, p. 52.
Canthocamptus mirabilis StErba. T a i and Song, 1979, p. 216 ; It6 and Takashio, 1980,
p. 210 ; Kikuchi, 1982, p. 670 ; Miura, 1984, p. 515.
Materials illustrated : River Hir6, Hokkaido (42"15'N, 143"19'E), 2 July 1983, male andfemale.
Remarks : This species is very common in forest lentic and lotic waters, excluding lakes.
The distribution seems to be restricted within a circle (r=ca 350km.) with a center at
Wakkanai, nothern most of Hookkaido (Fig. 1). The species shows allopatric distribution for
Canthocamptzts sp. 11. Some females have narrow cadual rami which are similar to those of themales, and the occurrence in a population varies from zero to 100 percents, by districts.

79

IshidaCanthocamptus mirabiliso c s p l l

Hakodate

Fig. 1. Distribution map of C U ~ ~ ~ O C mirabilis
Q ~ @ ~ andU S C. sp. I1 in Hokkaido.

4 . Canthocamptus sp. I1(Plate 4)

Materials illustrated : Chitose, Hokkaido (42"49'N,141"33'E), 23 Dec. 1983, male and female.
Remarks : This species is very common, except lakes, in the south of C. mirabilis districts
as shown in Fig. 1. The species is closely related to C. mirabilis. In habitus, the species is easily
distinguished from other on trianglar anal operculum in both sexes, and fringed inner caudal
setae in female.
5. Mesochra rapiens (Schmeil, 1894)(Plate 5)Aspteinia rapiens Schmeil, 1894, p. 348 (not consulted).
Mesochra rapiens (Schemeil). Gurney, 1932, p. 264 ; Lang, 1948, p. 947 ; Borutskii, 1952,
p. 146 ; Wilson and Yeatman, 1959, p. 839 ; Dussart, 1967, p. 255.
Materials illustrated : Lake Utonai, Hokkaido (42"42'N, 141'43'E), 30 May 1976, female ;River Chitose, Hokkaido (42"49'N, 141"33'E), 15 July 1980, male.
Remarks : Besides illustrated materials, 3 females and 6 males were collected at Lake Tbro
(43"09'N, 144"30'E), in 11 June 1984.

80

Freshwater Harpacticoid Copepods of Hokkaido, Northern Japan

6 . Mesochra ukakuna Wilson 1958
(Plate 6)
Mesochru alaskunu Wilson, 1958, p. 47.
Mesochru alaslzana Wilson. Wilson and Yeatman, 1959, p. 840 ; Ishida, 1982, p. 49 ;Miura, 1984, p. 519
Materials illustrated : Lake Akan, Hokkaido (43"27", 144"07'E), 27 May 1981, male andfemale.
Rernarkes : This species inhabits in high density in Lake Akan. One female was found ata small stream of the Cape Erimo (42"00", 143"13'E),31 Dec. 1981.

Kuromatsunai
Oepresslon

SapporoL.T6ya)Attheyella idahoensls

Fig. 2. Distribution map of Attheyella iduhoensis and A. nakaii in Hokkaido (in part).

7. Attheyella iduhoensis (Marsh, 1903)(Plate 7)
Canthocamptm idahoensis Marsh, 1903, p. 112 (not consulted).
Attheyella idahoensis (Marsh). Coker, 1934, p. 123 ; Lang, 1948, p. 971 ; Borutskii, 1952,
p. 262 ; Wilson and Yeatman, 1959, p. 844.
Attheyella sp. A. Ishida, 1983, p. 45.
Materials illustrated : Biruwa, Hokkaido (43"34'N, 144"30'E, 25 Aug. 1983, male and female.
Remarks : This species occurs very commonly in the north of the Kuromatsunai Depression as shown in Fig. 2. The females from Lake Shikotsu (42"47'N, 141'23'E) have truncated cadual rami, which are similar to those of A. nakuii of Lake Aoki, central Japan,
originally described by Brehm (1927).

81

Ishida8. Attheyella nakai (Brehm, 1927)(Plate 8)

Canthocamptus Nakaii Brehm, 1927, p. 138.
Attheyella nakaii (Brehm). Lang, 1948, p. 972 ; Borutskii, 1952, p. 260 ; Ishida, 1983,~.
45.
Attheyella morimotoi Miura, 1962, p. 271 ; Miura, 1984, p. 523.
Materials illustrated : Nikko, Tochigi Pref., Honshu (36"44'N, 139"31'E),24 Nov. 1979, maleand female.
Remarks : This species is very common in southern Hokkaido. Sympatric distribution of
A . idahoensis with this species is seen in the areas as shown in Fig. 2. In the sympatric areas,
all matured females of this species have caudal rami same to those of male (Ishida, 1983).
The auther collected two females and four males from Lake Aoki (type locality), central
Japan, 26 May 1986. The female specimens coincide with that of Brehm's description, especially in respect to truncated caudal rami, which are seemed t o be lake abyssal form.
Miura (1962) reported Attheyella morimotoi from the subteranean waters of Shikoku,
Japan. However, his A . morimotoi seems to be a junior synonym of A. nakaii.
9. Attheyella crassa (Sars, 1862)(Plate 9)

Canthocamptus crmsus Sars, 1862, p. 232 (not cnsulted).
Attheyella crassa (Sars). Lang, 1948, p.965 ; Borutskii, 1952, p. 257 ; Dussart, 1967, p.
263 ; Tai and Song, 1979, p. 232 ; Kikuchi, 1982, p. 670 ; Ishida, 1981, p. 39.
Materials illustrated : Erimo, Hokkaido (42'00", 143'13'E), 17 Sept. 1980, male and female.
Remarks : This species is common in Hokkaido.
10. Attheyella orientalis Chappuis, 1929
(Plate 10)

Attheyella orientalis Chappuis, 1929, p. 97 (not consulted).
Attheyella orientalis Chappuis. Lang, 1948, p. 970 ; Ishida, 1981, p. 39.
Materials illustrated : Obihiro, Hokkaido (42"47", 143"09'E), 5 July 1983, female ; Biruwa,
Hokkaido (43"34", 144"30'E),11 June 1984, male.
Remarks : This species is common in Hokkaido, especially in lakes, pools and ditches.
11. Attheyella sp. M(Plate 11)

Materials illustrated : Mikazuki, Hy6go Pref., Honshil (35"00'N, 134"27'E), 29 April 1980,
male and female.
Remarks: One female and 2 males were obtained in a small ditch of Rankoshi (42"54'N, 140"82

Freshwater Harpacticoid Copepods of Hokkaido, Northern Japan36'E), on 6 August and 30 September 1985.
1 2 . Attheyella dentata (Poggenpol, 1874)(Plate 12)

Cunthocamptus dentatus Poggenpol, 1874, p. 43 (not consulted).
Canthocumptus dentatus Poggenpol. Gurney, 1932, p. 191.
Attheyella dentuta (Poggenpol). Lang, 1948, p. 976 ; Wilson and Yeatman, 1959, p. 848 ;Tai and Song, 1979, p. 236 ; Ishida, 1984, p. 51.
Materials illustrated : Makubetsu, Hokkaido (42"55", 143"20'E),5 July 1983.
Remarks : This species is not rare in Hokkaido. The species seems to be the inhabitantof shallow lakes, and weed-filled ponds of open land.
13. Attheyella nordenskjoldii (Lilljeborg, 1902)(Plate 13)

Canthocamptus Nordenskjoldii Lilljeborg, 1902, p. 8 (not consulted).
Cunthocumptus hyperboreus Willey, 1925, p. 156.
Attheyella illinoisensis (Forbes). Lang, 1948, p. 978.
Attheyella nordenskjoldii nordenskjoldii (Lilljeborg). Borutskii, 1952, p. 276.
Attheyella nordenskjoldii (Lilljeborg). Wilson and Yeatman, 1959, p. 845 ; Ishida, 1981,
p. 39 ; Miura, 1984, p. 521.
Materials illustrated : Otoineppu, Hokkaido (44"43",female.

142"14'E), 14 Oct. 1983, male andRemarks : The occurence seems t o be rather sporadic. Often, very high density is observed. Present known loclities in Hokkaido are as follows ; Otoineppu, Lake Shiretoko (44"03'N, 145"03'E),Lake Shikotsu (42"47'N, 141"23'E),Lake Akan (43"27", 144"07'E),Honbetsu (43"09'E, 143"39'E) and Niikappu (42"24'N, 142"17'E).
1 4 . Muraenobiotus vejdovskyi Mrszek, 1893
(Plate 14)

Maraenobiotus vejdovskyi Mrszek, 1893b, p. 103 (not consulted).
Muraenobiotus vejdovskyi Mrszek. Lang. 1948, p. 1017 ; Borutskii, 1952, p. 251 ; Dussart, 1967,~.280 ; Ishida, 1981, p. 38 ; Miura, 1984, p. 526.
Materials illustrated : Yoichi, Hokkaido (43'13N, 140"44'E), 29 Apr. 1980, female ; Horokanai, Hokkaido (44"00'N, 142'08'E), 28 Feb. 1981, male.
Remarks : This species is not rare, with low abundance, in the districts of the west coastof Hokkaido. Ornamental character of anal operculum and shape of cadal rami vary byindividuals within a same place.
83Ishida15. Maraenobiotus brucei (Richard, 1898)(Plate 15)

Mesochra Brucei Richard, 1898, p. 334 (not consulted).
Maraenobiutzls brucei (Richard). Lang, 1948, p. 1019 ; Borutskii, 1952, p. 245 ; Wilson
and Yeatman, 1959, p. 833 ; Dussart, 1969, p. 287 ; Ishida, 1982, p. 51 ; Miura, 1984,
p. 528.
Materials illustrated : Hir8, Hokkaido (42"15", 143'19'E), 2 July 1983.
Remarks : This species is common in the areas of the southern foot of the Hidaka
Range.
16. Gulcamptus sp. S(Plate 16)
gen. Gulcamptus Miura, 1969, p. 250

Materials illustrated : Shikotsu-kohan, Hokkaido (42'47",

141'23'E), 9 Sept. 1985.

R e m a r k s : A dense population inhabits in a small inflow of Lake Shikotsu, near
Shikotsu Salmon Hatchery.
17. Epactophanes richardi MrBzek, 1893
(Plate 17)

Epactophanes richardi Mrgzek, 1893a, p. 108 (not consulted).
Epahtophunes richardi MrBzek. Lang, 1948, p. 1026 ; Borutskii, 1952, p. 368 ; Wilson
and Yeatman, 1959, p. 832 ; Dussart, 1967, p. 290 ; Tai and Song, 1979, p. 258 ;Ishida, 1982, p. 51.
Materials illustrated : Yoichi, Hokkaido (43"13'N, 140"44'E), 7 June 1981, female only.
Remarks : This cosmopolitan is common in Hokkaido, too.
18. Moraria poppei (MrBzek, 1893)(Plate 18)

Ophiocamptus poppei Mr%zek,1893a, p. 114 (not consulted).
Moraria poppei (MrBzek). Gurney, 1932, p. 234 ; Lang, 1948, p. 1036 ; Borutskii, 1952, p.
335 ; Dussart, 1967, p. 298 ; Ishida, 1981, p. 40 ; Miura, 1984, p. 530.
Materials illustrated : Tsukigata, Hokkaido (43"22'N, 141"37'E), 3 Dec. 1980.
Remarks : This species is not rare with low abundance in Hokkaido.

84

Freshwater Harpacticoid Copepods of Hokkaido, Northern Japan

19. Moruria duthiei (T. & A. Scott, 1896)(Plate 19)

Attheyella Duthiei T. & A. Scott, 1896, p. 4 (not consulted).
Morariu duthiei (T.& A. Scott). Gurney, 1932, p. 227 ; Lang, p. 1037 ; Borutskii, 1952, p.
328 ; Wilson and Yeatman, 1959, p. 835 ; Dussart, 1967, p. 300 ; Kikuchi, 1982, p.
670 ; Ishida, 1981, p. 4 1 ; Miura, 1984, p. 532.
Materials illustrated : Erimo, Hokkaido (42'00'N, 143"13'E),31 Dec. 1981.
Remarks : This species is common, especially in Konsen Genya, eastern Hokkaido.
20. Moraria varica (Graeter, 1911)(Plate 20)

Canthocamptm varicus Graeter, 1911, p. 18 (not consulted).
Moruria varica (Graeter). Gurney, 1932, p. 243 ; Lang, 1948, p. 1042 ; Borutskii, 1952, p.
337 ; Dussart, 1967, p. 304 ; Ishida, 1982, p. 51 ; Miura, 1984, p. 533.
Materials illustrated : Tsukigata, Hokkaido (43"22", 141"37'E), 26 June 1982, female ;Kajikawa, Niigata Pref., Honshfi (38"00'N, 139"24'E), 27 June 1981, male.
Remarks : Only a few specimens were caught at the west coast districts of Hokkaido.
21. Moraria sp. B(Plate 21)
Moraria sp. B, Ishida, 1981, p. 41 ; Ishida, 1982, p. 52.
Moraria sp. 2, Kikuchi, 1984, p. 279.
Materials illustrated : Furano, Hokkaido (43"21'N, 142"23'E), 27 July 1982, female ; Otoineppu, Hokkaido (44"43'N, 142'14'E), 14 Oct. 1983, male.
Remarks: This species is not rare. The main distribution of the species seems to be
confined to western Hokkaido (Kikuchi, 1984). Occasionally the species occurs densely at asmall space.
22. Bryocamf~tmzschokkei (Schmeil, 1893)(Plate 22)

Canthocamptus zschokkei Schmeil, 1893, p. 31 (not consulted).
Canthocamptus zschokkei Schmeil. Gurney, 1932, p. 144.
Bryocamptus zschokkei (Schmeil). Lang, 1948, p. 1066 ; Borutskii, 1952, p. 191 ; Wilson
and Yeatman, 1959, p. 850 ; Dussart, 1967, p. 329 ; Ishida, 1981, p. 37 ; Kikuchi,
1982, p. 670.
Materials illustrated : Lake Akan, Hokkaido (43"27'N, 144"07'E), 27 May 1981

IshidaRemarks : This species is widespread and very common with high density, especially atspring seepage sites.
23. Bryocamptus vejdovskyi (MrBzek)(Plate 23)

Cantkocamptus vejdovskyi Mr%zek,1893b, p. 38 (not consulted).
Bryocamptus vejdovskyi (MrBzek). Lang, 1948, p. 1074 ; Borutskii, 1952, p. 178 ; Wilson
and Yeatman, 1959, p. 856 ; Dussart, 1967, p. 332 ; Tai and Song, 1979, p. 218 ;Ishida, 1981, p. 37.
Materials illustrated : Lake Oikamanae, Hokkaido (42"36", 143"32'E), 2 July 1983.
Remarks : The species is common in shallow lakes and ponds.
24. Bryocamptus laccophilus (Kessler, 1914)(Plate 24)

Cantkocamptus laccopkilus Kessler, 1914, p. 628 (not consulted).
Bryocamptus laccophilus (Kessler). Lang, 1948, p. 1098.
Arcticocamptus laccopkilus (Kessler). Borutskii, 1952, p. 221.
Bryocamptus laccopkilus (Kessler). Dussart, 1967, p. 354 ; Ishida, 1982, p. 50 ; Miura,
1984, p. 538.
Malerials illustrated : Erimo, Hokkaido (42"00'N, 143"13'E), 17 Sept. 1980, female only.

Remarks : Only one female was obtained at a small stream near the Cape Erimo.
25. Bryocamptus hiemalis (Pearse, 1905)(Plate 25)

Cantkocamptus hiemalis Pearse, 1905, p. 153.
Bryocamptus hiemalis (Pearse).Lang, 1948, p. 1107.
Bryocamptus kiemalis kiemalis (Pearse). Borutsskii, 1952, p. 235,
Byyocamfitus hiemalis (Pearse). Wilson and Yeatman, 1959, p. 854 ; Kikuchi, 1982, p.
670 ; Ishida, 1984, p. 43.
Materials illustrated : Chitose, Hokkaido (42"49", 141"33'E),8 Apr. 1982.
Remarkes : This species is very common in cold waters, from seepage springs to large

lakes and from trickles to rivers. In habitus, the species, B. calvus and B. nivalis are easily
distinguished with the difference of the arrangement of the dorsal spinule rows on abdomen.
26. Bryocamptus calvus (Brehm, 1927)(Plate 26)

Canthocamptus calvus Brehm, 1927, p. 143.
86

Freshwater Harpacticoid Copepods of Hokkaido, Northern Japan

Bryocamptus hiemulis brevifurca Coker, 1934, p. 101.
Bryocamptus calvus (Brehm). Lang, 1948, p. 1111 ; Ishida, 1984, p. 43 ; Miura, 1984, p.
538.
Materials illustrated: Chitose, Hokkaido (42'49", 141"33'E), 8 Apr. 1982.
Remarks : This species is very common in cold waters, and sympatric with B, hiemalis.
The description of the species was given briefly and fragmentary by Brehm for female specimen
from Lake Aoki, central Japan. I tried a sampling at the type locality, on May in 1986, butfailed to get the specimen in the lake. Two females were caught at a small inflow of the lake.
Their morphological character does not conflict with the Brehm's description, and coincides
with that of the specimens from Hokkaido.

27. Bryocamptus nivalis (Willey, 1925)(Plate 27)
Attheyella nivalis Willey, 1925, p. 153.
Bryocamptus nivulis (Willey). Lang, 1948, p. p. 1110 ; Wilson and Yeatman, 1959, p. 854 ;Kikuchi, 1982, p. 670 ; Ishda, 1984, p. 43.
Materials illustrated : Yoichi, Hokkaido (43"13'N, 140"44'E), Sept. 1984.
Remarks : Sympatric distribution of the species with B. hiemalis and B. calvus occurs
commonly, but the abundance is not so high.
28. Elaphoidella bidens (Schmeil, 1894)(Plate 28)

Cunthocumptus bidens Schmeil, 1894, p. 73 (not consulted).
Attheyella coronata Sars, 1904, p. 641 (not consulted).
Cunthocumptus bidens Schmeil. Gurney, 1932, p. 184.
Attheyella bidens (Schmeil) coronata (Sars).Coker, 1934, p. 130.
Eluphoidella bidens (Schmeil). Lang, 1948, p. 1134.
Eluphoidella bidens bidens (Schmeil). Borutskii, 1952, p. 294.
Elaphoidellu bidens coronata (Sars).Wilson and Yeatman, 1959, p. 849.
Eluphoidellu bidens (Schmeil). Dussart, 1967, p. 374.
Eluphoidella coronata (Sars). Tai and Song 1979, p. 251.
Eluphoiddla sp.. Ishda, 1981, p. 40.
Materials illustrated : Lake Mikazuki-numa, Hokkaido (42'40",
female.

141"53'E), 12 Apr. 1981,

Remarks : Besides illustrated specimen, one female was caught at Lake o-numa (42"00",140"43'E) and Lake Benten-numa (42"39'N, 141"46'E), respectively. Although the obtained
specimens were only a few, it seems to be common in coastal shallow lakes along the coast of
the Pacific.
87

Ishida29. Paracamptus reductus Wilson, 1956
(Plate 29)

Paracamptus reductus Wilson, 1956, p. 348.
Paracamptus reductus Wilson. Wilson and Yeatman, 1959, p. 833 ; Ishida, 1982, p. 51.
? Paracamptus Nakamurai Chappuis, 1958, p. 76.
? Paracamptus nakamurai Chappuis. Miura, 1984, p. 546.
Materials illustrated : Tsukigata, Hokkaido (43"22", 141"37'E), 3 Dec. 1980, female ;Mikawa-mura, Niigata Pref., HonshQ (37"45", 139"24'E), 28 Apr. 1981, male.
Remarks : Only a few individuals were caught from Hokkaido.

Acknowledgements
I would like to thank Dr. Tomiko It8 (Hokkaido Fish Hatchery) for the gift of valuablespecimens. I am also obliged t o Mr. Yoshifumi Miura, Hy8go Prefecture, for his guidance andthe gift of valuable references. My deep thanks are also due t o Dr. Yoshiaki Kikuchi (Ibaraki
University) for his useful advice and critical reading of the manuscript, and the gift of valuablereferences.

References
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Moscow-Leningrad.
Brehm, V. (1924) : Diagnosen neuer Entomostraken. IV. Akad. Anz. Wien, 1924 (13), 99-100.
Brehm, V. (1927) : Uber die Tiefenfauna japanischer Seen. Arch.

Hydrobiol. 18, 135-150.

Chappuis, P. A. (1929) : Note sur le Copepods. Bull. Soc. Stunte Cluj. 4, 97-99.
Chappuis, P. A. (1955) : Harpacticoides troglobies du Japon. Notes biosp60l. 10, 183-190.
Chappuis, P. A. (1958) : Mission Franco-Japonaise dens les grottes du Japon. Harpacticoides de lagrotte dite Akiyoshi-Do. Notes Biospgool. 13, 71-83.
Coker, R. E. (1934) : Contribution to knowlege of North American freshwater harpacticoid copepod
Crustacea. Jour. Elisha Mitchell Sci. Soc. 50, 75-141.
Dussart, B. (1967) : Les Copgpodes des eaux Continentals. Tome I : Calanoides et Harpactioides. 500 pp.
Paris.
Graeter, E. (1911) : Die Copepoden der unter irdischen Gewasser. Arch. f: Hydrobiol. 1, 111-152.
Gurney, R. (1932) : British freshwater Copepoda. Vol. 2. (Harpacticoida). 336 pp. Ray Society, London.
Ishida, T. (1981) : A preliminary account of the fresh-water harpacticoid copepods of Hokkaido,
northern Japan. Sci. Rep. Hokkaido Salmon Hatchery. (35), 33-56. (in Japanese with English
Summary)
Ishida, T. (1982) : Futher notes of the fresh-water harpacticoid copepods of Hokkaido, nothern Japan.

Sci.Rep. Hokkaido Salmon Hatchery. (36), 49-61. (in Japanese with English Summary)
Ishida, T. (1983) : On the distribution of the related three species and variety of genus Attheyelkz (Copepoda, Harpacticoida), in Hokkaido and Honshu, Japan. Sci. Rep. Hokkaido Salmon Hatchery.
88

Freshwater Harpacticoid Copepods of Hokkaido, Northern Japan(37), 45-51. (in Japanese with English Summary)
Ishida, T. (1984a) : On the distribution of the related three species of genus Bryocamptus (Copepoda,
Harpacticoida), in Hokkaido and Honshu, Japan. Sci. Rep. Hokkaido Salmon Hatchery. (38), 43-49. (in Japanese with English Summary)
Ishida, T. (1984b) : On the newly discovered three species of Copepoda Halicyclops sp., Acanthocyclops
venustoides bispinosus (Yeatman) and Attheyella denfata (Poggenpol) of freshwaters of Hokkai-do, Japan. Sci. Rep. Hokkaido Salmon Hatchery. (38), 51-56. (in Japanese with English
Summary)Itb, T. and Y. Kikuchi (1977) : On the occurrence of Haqacticella paradoxa (Brehm) in Japan; a freshwater Harpacticoid Copepod originally described from a Chinese lake. A n n . 2001.lap. 50 (l),40-56.
It8, T. and T. Takashio (1980) : Canthocamptus mirubilis StErba (Copepoda, Harpacticoida) from
Hokkaido, northern Japan. A n n . 2001. Jap. 53(3), 210-219.
Jurine, L. (1820) : Histoire des Monocles qui se trouvent aux environs de Geneve. 260 pp. Gengve, Paris.
Kessler, E. (1914) : Zwei neue Canthocumptus Arten aus dem Riesengebirge. 2001.Anz. 43, 626-630.
Kikuchi, Y. (1982) : On a faunistic survey of the freshwater harpacticoid copepods from the east of
Hokkaido. 2001.Sci. 91 (4), 670. (in Japanese)
Kikuchi, Y. (1984) : Morphological comparison of two terrestrial species of Moraria (Canthocamptidae,
Harpacticoida) from Japan, with the scanning electron microscope. Crustaceana Supplement 7,279-285.
Kikuchi, Y. (1985) : Redescription of a freshwater Harpacticoid copepod, Ehphoidella grandidieri(Guerne & Richard, 1893), from a swamp a t Itako, central Japan. Publ. Itako Hydrobiol. Stn. 2(l),1-8.
Lng, K. (1948) : Monographie der Harpacticiden. 1683 pp. Hakan Ohlssons Boktryckeri, Lund.
Lilljeborg, W. (1902) : T r e s species novae generis Canthocampti e Novaja Semlja et Sibiria boreali.
Bihang Kungl. Sv. Vet.-Acad. Handl. 28.
Marsh, C. D. (1903) : On a new species of Canthocamptus from Idaho.
Letters 14, 112-116.

Trans. Wis. Acad. Sci.,Arts andMiura, Y. (1984) : Nippon no rikusuisan Harpacticoida. Nippon / Chugoku Tansuisan Kai-ashi rui, 500-563. (in Japanese)
Miura, Y. (1962) : Three new harpacticoid copepods from the subterrancean waters of Shikoku in Japan.
Jap. J. 2001. 13, 267-274.
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89-130.
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IshidaPOggenpo1,

M. J. (1874): Verzeichnis der COpepoden, Cladoceren und Ostracoden der Umgebung

MOscou.

NOv. SOc. imper. Amis

Richard, J. (1898): Sur la faune desPrincese Alice. Mem.
Sars, G. 0. (1862): Oversigt

vonSci. nathop. Ethnogr. Univ. MOscow. t0 (2),69‑81.

eauxdouces explores

1898 pendant Ia campagne

en

du

yacht

SOc. ZO01. F/. 11, 326‑338.
af deindenlandske Ferskvandscopepoder.

FOrh. Videnskabs ‑ Selsk

Christiania, 212‑262.
Sars, G. 0. (1904): Pacifische Plankton‑Crustacean.

ZOo/. /b. Syst. 19, 629‑645.

Schmei1.0. (1893a):

COpepoden des Rhatikon‑Gebirges. Abh. naturforsch. Ges. Halle. 19, 1‑40

Schmei1,0. (1893b):

Deutschelands freilebende stisswasser COpepoden.

I1. Harpacticidae. Bib1. ZO01.

Stutt. 15, 1‑100.
Schmei1, 0. (1894): Additions t0 the fauna of the Firth 0f FOrth. 12th Ann.
II1.348

Rep. Fish. 8d. Scotland, Partpp.

Scott, T. & A. (1896): SOme
Sterba, 0. (1968): Neue

new

Or

rare

Crustacea from

Scotland. Ann. Mag. nat. Hist. 6 (18), 1‑8.

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Sinica. Crustacea, Freshwater COpepoda. 450

pp.

Peking.

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158.

Wilson, M. S. (1956): NOrth American

harpacticoid copepods : 3 Paracamptus

reductus

fromn. sp.,

Alaska./. Wash. Acad. Sci. 46 (11), 348‑351.
Wilson, M. S. (1958): NOrth Americn
Canthocamptidae
Wilson, M. S. andharpacticoid copepods. 4. Diagnoses of new

and Cletodidae (Genus Huntemmania}.

H. C. Yeatman.

(1959): Free ‑ living

コ巳

Proc. Bio1. SOc. Wash. 71, 43‑48.

COpepoda

Biology, (ed.) W. T. Edmondson. 1248 pp. 815‑861. JOhn

species Of fresh‑water: Harpacticoida.

in

Fresh

‑ water

Willey, N. Y

海道の淡水 ソコミジンコ

石

田

昭

夫

) の種類相と分布の状態がほほ明らかとなっ北海道の淡水域に生息するソコミジンコ (地下氷種を除くたので，樟の同定に役立つ形に作製した図版をそえて報告する。
使用できた材料は全道各地から
集められた
22． W0 試料である。 リコ ミジ ンコの採集注は特異なので・
著者のm

原記載，わが国で入手し方法を紹介する。
種類相は未記載種 4 種を含む?． 種である。 シノ二ムリストにはやすいモ ハグラフ．および関係するわが国とアジア，北米の論文を収めてある。 摘要にはその種の分布域・分布密度．生息場所等を記述する。図版は各葉とも
全体図 (―部を除き雌のみ) と口器を除く
体の各部位
の 図を，

同 ―の順序でほほ
同 L 位置に配置して描いてある。

%

Freshwater Harpacticoid

COpepods Of HOkkaid0, NOrthern Japan

f

Plate

1. Harpacticella pamdoxa (Brehm)

91

IshidaPlate

2． Cd れ fAoLQW 力 f硲 5仇クん TLHM5 (Jurine)

E2

Freshwater Harpacticoid COpepods Of HOkkaid0, NOrthern Japan

Plate 3. Canthocamptus mirabilis
Sterba93

IshidaPlate

4． C?wf ぬ OC4W
94

力 fMS Sp ． II

Freshwater Harpacticoid COpepods

Of HOkkaid0,

NOrthern Japan

O
j，

Plate

P5 .m

b‑k

5. Mesochra rapiens (Schmeil)

95

Ishidaj,P5 ,mh,Enp,P3

,m

O

O

k b‑f

i,Enp,P4 ,mPlate

6． M 幻。 肋川 &応妨 M

%

9"T

WHSOn

Freshwater Harpacticoid

Plate

COpepods

Of HOkkaid0,

NOrthern Japan

7 Aff 乃 4M 伍 fdd 九 0g 乃 Sぬ (MarSh)・

9Z

IshidaPlate

8 AffA 印ぬ ぬれ?比F (Brehm)・Freshwater Harpacticoid COpepods Of HOkkaid0, NOrthern JapanO ． lmmb‑k, P 3 .m

Plate

9. Attheyella99

crassa(Sars)

Ishidab‑

P5,fPlate 10. Attheyella orientalis

100

Chappuis

Freshwater Harpacticoid COpepods 0f HOkkaid0, NOrthern Japan

Plate 11. Attheyela

101

sp.

M

IshidaPlate 12. Attheye ぬ ぬれな 血 (POggenpol)702

Freshwater Harpacticoid COpepods 0f HOkkaid0, NOrthern Japan

六
。

。

ハ

k. 「 u.fPIate 13

・

AM

o
―

b‑j
l.「 u.m

ゅW ぬれ0K ぬW ゆ川 成ゴ (Lmleborg)
103

k，l

IshidaPlate

I4

Maraenobiotus

j山

vejdovski MrSzek

Freshwater

Harpacticoid COpepods Of HOkkaid0, NOrthern Japan

O ． @mmO

f ， P 5 .f

j,P 5 .m

b‑j
Plate

I5

Maraenobiotus brucei (Richard)

105

IshidaO ． 05mmOb‑ f
PIate 16 ． Gu わ iampptus sp.S

106

g"

」

Freshwater Harpacticoid COpepods Of HOkkaid0, NOrthern Japan9b‑fPlate 17. Epactophanes richardi Mrazek

107

I血idaf

C ， P2. fm

Plate 18 M0 呵血力ゆ伴f (M ぬZek)・JO8Freshwater

Harpacticoid COpepods Of HOkkaid0, NOrthern Japan

Plate 19. MOraria duthiei (T. & A. Scott)109

IshidaPlate 20.

M 。 柑血 vanca (Graeter@110Freshwater

Harpacticoid COpepods 0f HOkkaid0, NOrthern Japan

Plate 21. MOraria sp. B

IllIshidaPlate 22・B ひ occmpt 硲巧 cho Aei (Schme
ん

112

川

Freshwater Harpacticoid COpepods 0f HOkkaid0, NOrthern Japan

Plate 23. Bryocamptus

113

vejdovskyi (Mrazek)

IshidaPlate

M B ひ O田W タ加
5 laccophilus (Kessler),female only・

114

Freshwater

Harpacticoid COpepods Of HOkkaid0, NOrthern Japanl, A bd ,mi,Enp.P4 ， m
Plate 25. Bryocamptns hiemalis (Pearse)

115

IshidaPlate 26. Bryocamptus

116

calvus (Brehm)

Freshwater

Harpacticoid COpepods Of HOkkaid0, NOrthern Japan

Plate 27. Bryocamptus

117

nivalis (Willey)

IshidaPlate 28. Elaphoidella bidens (Schmeil), female only118

Freshwater

Harpacticoid COpepods Of HOkkaid0, NOrthern Japanf, P5,

fh,Enp,P3,mPIate 29 ． Rm

□ゆ f硲 w7MCf 応 WilSon

L9