| Country | Russian Federation | Ecosystem | |
| Locality | Northeastern Black Sea, offshore, Tuapse to Sochi | Depth | |
| Introduced | Year Intro. | 1980 | |
| Life Stage | not specified | unsexed | |
| Quantitative | 1016 | Unit | numbers/m^2 |
| Semi Quantitative | 1000-50000 | Unit | numbers/m^2 |
| Qualitative | abundant | ||
| Year | 2000 - 2000 | Period | 1975-2000 |
| Date | 2000-08-01 00:00:00 - 2000-08-31 00:00:00 | Record Type | survey |
| Record Type | survey | ||
| Seasonal | yes | Method | volumetric |
| Remarks | Such high quantitative value has not been observed for M. leidyi from offshore areas of the Black Sea since 1995. | ||