The Phalloptychus eigenmanni lives in the pelagic, freshwater environment.
Phalloptychus eigenmanni can be distinguished from its congeners by the number of pelvic-fin rays in females (6 vs. 5, respectively), by the number of predorsal scales (13 vs. 10-12, respectively), and the longer predorsal distance in females (64.0-68.6 vs. 55.4-62. More
Eigenmanns tandkarpe in Danish (dansk)