where did it get the name from?
The name  was chosen based on the characteristic absence of a proboscis in this species of Acanthocephala.
Apororhynchus
The name "Arhynchus" was chosen based on the characteristic absence of a proboscis in this species of Acanthocephala. It was later renamed "Apororhynchus" (along with the family name Apororhynchidae) by Shipley in 1899 due to the name "Arhynchus" having been used by Dujean in 1834 for a beetle.
what is apororhynchus? It a genus of small parasitic spiny-headed  worms. does it cause any disease? Yes, specially in birds. can you name any? Enteritis and anemia.
wiki:14444413
Apororhynchus [SEP] Taxonomy
The first species in this order to be described was "Apororhynchus hemignathi" which was originally named "Arhynchus hemignathi" by Arthur Shipley in 1896. The name "Arhynchus" was chosen based on the characteristic absence of a proboscis in this species of Acanthocephala. It was later renamed "Apororhynchus" (along with the family name Apororhynchidae) by Shipley in 1899 due to the name "Arhynchus" having been used by Dujean in 1834 for a beetle. Although "Apororhynchus" has not been included in phylogenetic analyses thus far due to insufficiency of morphological data, the lack of features such as an absence of a muscle plate, a midventral longitudinal muscle, lateral receptacle flexors, and an apical sensory organ when compared to the other three orders of class Archiacanthocephala indicate it is an early offshoot (basal).