Korovchinsky Nikolai M
A.N. Severtsov Institute of Ecology and Evolution of the Russian Academy of Sciences, Leninsky prospect 33, 119071 Moscow, Russia..
Zootaxa. 2019 Jan 25;4550(3):340-356. doi: 10.11646/zootaxa.4550.3.3.
The North Eurasian interspecific hybrid forms of the genus Bythotrephes Leydig, 1860 are described morphologically in detail with consideration of the previous data on their allozyme analysis and brief morphological examination. In total, three hybrid forms have been encountered, among which B. brevimanus x B. cederströmii appear to be most common and widespread whereas two others, one of which is new to science, are known from single localities. The high morphological variability of the former hybrid form is analyzed and its diagnostic features, distinguishing their representatives from those of parental species are determined. Within their vast range, the hybrids B. brevimanus x B. cederströmii seem to be one of the most common and numerous members of the genus. For instance, they dominate in all reservoirs of the Volga River where their biology was investigated in some detail. The hybrids are distributed widely being known from Sweden, Finland, and north-west of European Russia to Central Yakutia in Eastern Siberia. The southern borders of their range extend to the south of Eastern Siberia and Eastern Kazakhstan. Further more detailed investigations of hybrids, both genetic and morphological, are highly desirable.
1860年，莱迪格（Leydig）所描述的北欧亚淡水蚤属（Bythotrephes）种间杂交形态，在考虑其等位酶分析和简要形态学检查的先前数据基础上进行了详细描述。总共遇到了三种杂交形态，其中短尾淡水蚤（B. brevimanus）×塞氏淡水蚤（B. cederströmii）似乎最为常见和广泛分布，而另外两种，其中一种是科学上新发现的，仅在单一地点被发现。分析了前一种杂交形态的高形态变异性，并确定了其诊断特征，以将其代表与亲本物种的代表区分开来。在其广阔的分布范围内，短尾淡水蚤×塞氏淡水蚤杂交种似乎是该属中最常见且数量众多的成员之一。例如，它们在伏尔加河所有已对其生物学进行了一定详细研究的水库中占主导地位。这些杂交种分布广泛，从瑞典、芬兰以及俄罗斯欧洲部分的西北部到东西伯利亚的雅库茨克中部都有发现。其分布范围的南部边界延伸到东西伯利亚南部和哈萨克斯坦东部。进一步对杂交种进行更详细的遗传和形态学研究是非常必要的。
