Recent Cyprididae and Ilyocyprididae (Crustacea: Ostracoda) from Lake Biwa, Japan, including a summary of the lake’s ostracod fauna

Abstract

Sampling between 1999 and 2007 of the recent ostracod fauna of Lake Biwa, an ancient lake located in Japan, produced ten Cyprididae and one Ilyocyprididae species. One Cyprididae species, belonging to the genus Ilyodromus is described herein, Ilyodromus intermedius Okubo n. sp., and Bradleytriebella lineata (Victor & Fernando, 1981c) is redescribed. One Cyprididae species is a new record for Japan, namely Stenocypris malayica Victor & Fernando, 1981a, while seven others are new records for Lake Biwa. The family Ilyocyprididae is represented by only one species in Lake Biwa, Ilyocypris salebrosa Stepanaitys, 1960. The Lake Biwa population of this species is the first record of males and they are described in this paper. Including this study, forty ostracod species have now been reported from Lake Biwa. Most species (70%) were found at depths of less than 1 meter. Only four species were found below 44 m, the mean depth of the north basin.

On some Recent non-marine ostracods from northern China, with description of one new species

“…Moreover the carapace of H. salina usually has a dark-brown colour pattem. Distribution.-This is a cosmopolitan species occurring in various geographical areas, including Europe, North Africa, North America and Japan (Meisch, 2000;Smith et al, 2011). In China, subfossil and living populations were reported from Remarks.-In the present study, at least two forms of H. incongruens were found.…”

Piacenzian–Gelasian non‐marine ostracods from the Dunarobba Fossil Forest (Tiberino Basin, Umbria, central Italy)

“…The results show that at least two morphotypes are recognizable; one is more elongated (Sri Lanka: Daday ; Neale ; Caribbean islands: Triebel ; Macedonia: Petkovski ; Senegal: Martens ; Lake Biwa (Japan): Smith et al . ) and the other is stouter, with relatively higher and shorter proportions, and smaller in size (Azerbaijan: Agalarova et al . ; Serbia: Krstić ; Dunarobba: present paper).…”

Living Ostracoda (Crustacea) from the town moat of Bremen, Germany

“…Cytheromorpha fuscata is not mentioned by Meisch (2000), unfortunately our observations allow no remarks on the seasonality; still, in 2014 there is a hint for a stable population of C. fuscata in the town moat of Bremen. With respect to species diversity, that in the town moat of Bremen is similar to the littoral margin of a lake, where the largest number of species are usually discovered, in contrast to the profundal zone, e.g., in the Laacher See (with 4 profundal species of altogether 13; Kempf & Scharf, 1980), the Arendsee (9-18; Scharf, 1998), or Lake Biwa (12-40;Smith et al, 2011). Finally, we identified 23 ostracod species in our study area similar to the species number of many lakes in temperate regions.…”