| Specimen ID | State | County | Locality | Year | HUC Number | Drainage Name | Status |
| 283558 | MI | Montcalm | Townline Lake | 2007 | 04050006 | Lower Grand | established |
| 1562593 | MI | Ionia | [No locality description provided] | 2014 | 04050006 | Lower Grand | established |
| 1562584 | MI | Kent | [No locality description provided] | 2014 | 04050006 | Lower Grand | established |
| 1562589 | MI | Kent | [No locality description provided] | 2014 | 04050006 | Lower Grand | established |
| 1563110 | MI | Montcalm | [No locality description provided] | 2014 | 04050006 | Lower Grand | established |
| 1669836 | MI | Ionia | Long Lake | 2018 | 04050006 | Lower Grand | unknown |
| 1669852 | MI | Kent | Big Pine Island Lake | 2018 | 04050006 | Lower Grand | unknown |
| 1692009 | MI | Kent | Wabasis Lake | 2019 | 04050006 | Lower Grand | unknown |
Citation for this information:
U.S. Geological Survey, 2025,
Nitellopsis obtusa: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov, Access Date: 12/4/2025