OSTRACOD RESEARCH

at the Lake Biwa Museum, Japan


Robin James Smith

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Genus Cyclocypris Brady & Norman, 1889

Superfamily: Cypridoidea Baird, 1845
Family: Candonidae Kaufmann, 1900
Subfamily: Cyclocypridinae Kaufmann, 1900

Two species have been reported from Japan:

1. Cyclocypris diebeli Absolon, 1973

Show synonymy list

1973 Cyclocypris diebeli n. sp. - Absolon: 56, 59-60, Tafel 3: Figs 1-3, Abb. 5, 17a-d, 38, Tabellen 1.
1974 Cyclocypris diebeli Absolon 1973 - Absolon: 272, 273, 276, 278.
1975 Cyclocypris diebeli Absolon 1973 - Diebel & Pietrzeniuk: 30, 35, 41, 42, Abb. 3, Tafel V: Figs 7 & 8.
1985 Cyclocypris diebeli Absolon 1973 - Pietrzeniuk: 207, 215-216, 222, Taf. III, Bilder 1 & 2.
1987 C. diebeli Absolon, 1973 - Meisch: 99.
1989 Cyclocypris diebeli - Koprivica: 183.
1991 Cyclocypris? diebeli Absolon 1973 - Fuhrmann: 270, 281-282, Taf. III, Bilder 7 & 8, Tabelle.
1995 Cyclocypris diebeli - Griffiths: 92, 100, 109, 113, 117, 143.
2001 Cyclocypris diebeli Absolon, 1973 - Janz & Matzke-Karasz: 43-44, 49, Taf. 2: Figs 7-10, Tab. 5, 11, 12.
2001 Cyclocypris diebeli - Matzke-Karasz et al.: 270.
2004 Cyclocypris diebeli Absolon, 1973 - Matzke-Karasz et al.: 1635-1663, Figs 1-11, Table 1, Appendix 1, 2, 3.
2005 C. diebeli (Absolon, 1973) - Keyser & Weitschat: 111.
2006 "Cyclocypris" diebeli Absolon, 1973 - Krstic: 132, Text-fig. 23.
2008 C. diebeli Absolon, 1973 - Külköylüoglu: 399.
2009 Cyclocypris diebeli Absolon, 1973 - Van der Meeren et al.: 1.
2011 Cyclocypris diebeli Absolon, 1973 - Martens & Savatenalinton: 27.
2011 C. diebeli Absolon, 1973 - Karanovic: 8, 9, 12, 54, Fig. 3.
2011 Cyclocypris diebeli Absolon, 1973 - Fuhrmann & Goth: 128, Plate 4, figs 14-19.
2012 C. diebeli Absolon 1973 - Karanovic: 323, 324.
2012a Cyclocypris diebeli Absolon, 1973 - Karanovic & Lee: Appendix 1.
2012b C. diebeli Absolon, 1973 - Karanovic & Lee: 1635.
2012 Cyclocypris diebeli Absolon, 1973 - Fuhrmann: 112, Plate 50, figs 1-4.

Status: full synonymy list

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Left side view of a female Cyclocypris diebeli, length about 0.55 mm.



Dorsal view of a female Cyclocypris diebeli, anterior to left, length about 0.55 mm.



External view of a right valve of a female Cyclocypris diebeli length 540 microns.



Detail of the anterior margin of the right valve. A series of tiny plates form a flange along the anterior edge of the valve.



The male sexual organ of Cyclocypris diebeli, length 132 microns.


Additional figures in: Matzke-Karasz et al. 2004 (carapace and appendages).
Habitat: Marsh (Matzke-Karasz et al. 2004).
Mode of life: Nektobenthic.
Reproductive mode: Sexual.
Known distribution: Kushiro Shitsugen, Eastern Hokkaido. Sub-fossils reported from Western Europe (Matzke-Karasz et al. 2004).

References:
Absolon, A. 1973. Ostracoden aus einigen Profilen spät- und postglazialer Karbonatablagerungen in Mitteleuropa. Mitteilungen der Bayerischen Staatssammlung für Paläontologie und Historische Geologie, 13, 47-94.

Absolon, A. 1974. Determination des Alms und verwandter Ablagerungen auf Grund der Ostracodenfauna. Casopis pro mineralogii a geologii, 19, 269-279.

Diebel, K. & Pietrzeniuk, E. 1975. Ostracoden aus dem holozänen Travertin von Bad Langensalza. Quartärpaläontologie, 1, 27-55.

Fuhrmann, R. 1991. Ostracoden aus dem Holstein-Interglazialbecken Wildschütz und Dahlen (Sachsen). Zeitschrift für Geologische Wissenschaften, 19, 269-288.

Fuhrmann, R. 2012. Atlas quartärer und rezenter Ostracoden Mitteldeutschlands. Altenburger Naturwissenschaftliche Forschungen, 15, 1-320

Fuhrmann, R. & Goth, K. 2011. Neu und weitere bemerkenswerte Ostrakoden aus dem Quartär Mitteldeutschlands. Palaeontographica, Abteilung A: Paläozoologie - Stratigraphie, 294, 95-201.

Griffiths, H. I. 1995. European Quaternary freshwater Ostracoda: a biostratigraphic and palaeobiographic primer. Scopolia, 34, 1-168.

Janz, H. & Matzke-Karasz, R. 2001. Holozüne Ostrakoden aus Karbonatablagerungen im Bereich der neolithischen Feuchtbodensiedlung Unfriedshausen (Bayern) als ökologische Indikatoren. Mitteilungen der Bayerischen Staatssammlung für Paläontologie und Historische Geologie, 41, 33-63.

Karanovic, I. 2011. On the recent Cyclocypridinae (Podocopida, Candonidae) with description of two new genera and one new species. Zootaxa, 2820, 1-61.

Karanovic, I. 2012. Recent Freshwater Ostracods of the World. Springer, 608pp.

Karanovic I., & Lee, W. 2012a. A review of candonid ostracods (Crustacea: Ostracoda: Podocopida) from East Asia, with descriptions of five new species from South Korea. Zootaxa, 3368, 7-49.

Karanovic I., & Lee, W. 2012b. Two new candonid species from South Korea (Ostracoda, Podocopida). Crustaceana, 85, 1633-1656.

Keyser, D. & Weitschat, W. 2005. First record of ostracods (Crustacea) in Baltic amber. Hydrobiologia, 538, 107-114.

Koprivica, D. 1989. Loessoide sandy silts in the Senta - Kikinda Area. Proceedings of Geoinstitute Belgrade, 23, 183-191 [Serbian with English Summary].

Krstic, N. 2006. Pliocene ostracodes of the Paludinian Beds in Pannonian Plain, Serbian part. Herald of the Natural History Museum, Belgrade, Special Publications, 1-409.

Külköylüoglu, O. 2008. Cyclocypris vinyardi n. sp. (Ostracoda) described from a rheocrene spring in Nevada (U.S.A.). Crustaceana, 81, 385-402.

Martens, K. & Savatenalinton, S. 2011. A subjective checklist of the Recent, free-living, non-marine Ostracoda (Crustacea). Zootaxa, 2855, 1-79.

Matzke-KArasz, R., Horne, D. C., Janz, H., Griffiths, H. I., Hutchinson, W. F. and Preece, R. C. 2001. 5,000 year-old spermatozoa in Quaternary Ostracoda (Crustacea). Naturwissenschaften, 88(6), 268-272.

Matzke-Karasz, R, Smith, R. J. & Homma, M. 2004. Cyclocypris diebeli Absolon, 1973 (Ostracoda, Crustacea), extinct in Europe, extant in Japan. Journal of Natural History, 38, 1635-1663.

Meisch, C. 1987. Ostracodes d-eau douce récoltés dans le sud-ouest de la France (Crustacea, Ostracoda). Bulletin de la Sociéyé des Naturalistes luxembourgeois, 87, 89-118.

Pietrzeniuk, E. 1985 Ostracoden aus dem holozänen Travertin von Weimar, Zeitschrift für Geologische Wissenschaften, 13, 207-233.

Van der Meeren, T., Khand, Y. & Martens, K. 2009. On Recet species of Tonnacypris Diebel & Pietrzeniuk, 1975 (Crustacea, Ostracoda), with new species descriptions from Mongolia. Zootaxa, 2015, 1-41.


2. Cyclocypris ovum (Jurine, 1820)


External view of a left valve of a female Cyclocypris ovum length 475 microns.



External view of a right valve of a female Cyclocypris ovum length 488 microns.


Figures in: Meisch 2000 (carapace and appendages); Sywula 1974 (carapace, male fifth limbs,seventh limb, caudal ramus, male sexual organ).
Habitat: Pond in woodland (Hiruta & Smith 2001).
Mode of life: Nektobenthic.
Reproductive mode: Sexual.
Known distribution: Japanese records restricted to Eastern Hokkaido (Hiruta & Smith 2001). General distribution Holarctic (Meisch 2000).

References:
Hiruta, S. & Smith, R. J. 2001. Living Freshwater and Shallow marine Ostracoda in Eastern Hokkaido, Japan (Field excursion E): 107 - 125. In: Guidebook of Excursions of the 14th International Symposium on Ostracoda (ed. Ikeya, N.). Shizuoka, Japan, 147 pp.

Meisch, C. 2000. Freshwater Ostracoda of Western and Central Europe. In: Schwoerbel, J., Zwick, P., (Eds.), Süßwasserfauna von Mitteleuropa 8/3. Spektrum Akademischer Verlag, Heidelberg, Berlin 522 pp.

Sywula, T. 1974. Fauna Slodkowodna Polski 24 - Malzoraczki (Ostracoda). Drukarnia Uniwersytetu Poznan, 315 pp.


Key characters Cyclocypris diebeli Cyclocypris ovum
Carapace - ventral valve overlapLeft valve overlaps right along ventral marginRight valve overlaps left along ventral margin
Carapace - margin structure - septaNo septa present
Carapace - margin structure - ridges on inner calcified lamellaOn left valveOn right and left valves
Carapace - dorsal view - female with brood pouchBrood pouch not visible
Carapace - lateral view - ventral marginVentral margin approximately straight to concave
Carapace - lateral view - valve heightLeft and right valves similar height
Carapace - internal viewAnterior calcified inner lamella wider than posterior one
Carapace - ornamentation - denticlesSmall denticles near ventral margin of valves
Carapace - ornamentation - sulcusNo sulcus
Carapace - ornamentation - surfaceSurface smooth
Carapace - width/length ratio (w/l)Greater than 0.7 (rounded species)Between 0.4 and 0.7 (medium species)
Antennule - segmentsSeven moveable segments
Antennule - Rome organRome organ present
Antenna - exopoditeExopodite reduced to small segment
Antenna - swimming setaeSwimming setae long, reaching to about end of claws Swimming setae very long, reaching to well beyond end of claws
Fifth limb - morphologyMaxilliped; Male palps with moveable terminal hooks
Sixth limb - segmentsFive segments
Sixth limb - setae on first segmentNo setae
Sixth limb - h3 seta on final segmentH3 seta short; much shorter than half length of claw
Seventh LimbCleaning limb, with three setae at end
Seventh Limb - segmentsFour segments
Seventh Limb - first segmentThree setae
Caudal ramusElongate ramus with two claws and two setae
Caudal ramus - attachmentWith no loops

© Robin J. Smith