Myers, 1924
Wildekamp, 1977
"N. geminus, N. janpapi and N. luekei make up the N. janpapi species group" - Watters, 2025.
Peters, 1868
"whereas N. fuscotaeniatus and N. lourensi comprise the N. lourensi species group" - Ibid.
Seegers, 1985
Radda, 1969
External References
Selected readings.