Angustinaripterus was a basal pterosaur, belonging to the breviquartossan family Rhamphorhynchidae (more specifically within the subfamily Rhamphorhynchinae) and discovered at Dashanpu near Zigong in the Sichuan province of China.

[1] The holotype, ZDM T8001, is a single skull with lower jaws, found in 1981 by researchers from the Zigong Historical Museum of the Salt Industry, in an outcrop of the Xiashaximiao Formation (Bathonian).

The nares are long, slit-like and positioned above and in front of the large skull openings, the fenestrae antorbitales, with which they are not confluent.

[5] The cladogram (family tree) below is a phylogenetic analysis published by paleontologists Brian Andres & Timothy Myers in 2013.

[6] Campylognathoides liasicus Campylognathoides zitteli Scaphognathus crassirostris Dorygnathus banthensis Rhamphorhynchus muensteri Cacibupteryx caribensis Nesodactylus hesperius Qinglongopterus guoi Harpactognathus gentryii Sericipterus wucaiwanensis Angustinaripterus longicephalus Sordes pilosus Monofenestrata