Neoechinorhynchus (Neoechinorhynchus) longinucleatus Amin, Ha & Ha 2011

are endoparasites of

• World Register of Marine Species: Leiognathus equulus (Forsskål 1775) (Common Ponyfish) (adult)
• World Register of Marine Species: Strongylura strongylura (van Hasselt 1823) (圆尾鹤鱵) (adult)

geographic distribution

• World Register of Marine Species: Vietnamese part of the South China Sea
• World Register of Marine Species: Gulf of Tonkin
• World Register of Marine Species: Gulf of Tonkin

trophic guild

• World Register of Marine Species: endoparasite
• World Register of Marine Species: endoparasite