1979

• Spangler, P.J. 1979: A new genus of water beetle from austral South America (Coleoptera: Hydrophilidae). Proceedings of the Biological Society of Washington 92(4): 697-718. BHL Reference page. 
• Spangler, P.J. 1979: A new genus of water scavenger beetle from Chile (Coleoptera: Hydrophilidae: Sphaeridiini). Coleopterists bulletin 33(3): 303-308. JSTOR Reference page. 

1981

• Spangler, P.J. 1981. Pagelmis amazonica, a New genus and Species of Water Beetle from Ecuador (Coleoptera: Elmidae). The Pan-Pacific Entomologist 57(1): 286-294. Reference page. 

1987

Spangler, P.J. & Santiago, S. 1987. A Revision of the Neotropical Aquatic Beetle Genera Disersus, Pseudodisersus, and Potamophilops (Coleoptera: Elmidae). Smithsonian Contributions to Zoology 446: 1-40. DOI: 10.5479/si.00810282.446. . Reference page. 

1992

• Spangler, P.J. & Santiago-Fragoso, S., 1992: The aquatic beetle subfamily Larainae (Coleoptera: Elmidae) in Mexico, Central America, and the West Indies. Smithsonian contributions to zoology, 528 : i-vi, 1-74. DOI: 10.5479/si.00810282.528. . Reference page. 

2001

• Spangler, P.J., Staines, C.L., Spangler, P.M. & Staines, S.L. 2001. A checklist of the Limnichidae and the Lutrochidae (Coleoptera) of the world. Insecta Mundi 15(3): 151–165. PDF. Reference page. 

2003

• Spangler, P.J. & Staines, C.L. 2003. Three new species of Hexanchorus Sharp, 1882 (Coleoptera: Elmidae: Larainae) from South America. Insecta Mundi 17(1–2): 45–48. PDF. Reference page. 

2005

• Spangler, P.J. & Steiner, W.E., Jr. 2005. A new aquatic beetle family, Meruidae, from Venezuela (Coleoptera: Adephaga). Systematic Entomology 30(3): 339–357. DOI: 10.1111/j.1365-3113.2005.00288.x . PDF.

2008

• Miller, K.B.; Spangler, P.J. 2008: Fontidessus Miller and Spangler, a new genus of Bidessini from Venezuela (Coleoptera: Dytiscidae: Hydroporinae) with three new species. Zootaxa 1827: 45–52. Abstract & excerpt Full article (PDF) posted by author Reference page. 

2011

• Maier, C.A. & Spangler, P.J. 2011. Hypsilara royi gen. n. and sp. n. (Coleoptera, Elmidae, Larainae) from Southern Venezuela, with a revised key to Larainae of the Western Hemisphere. ZooKeys 116: 25–36. DOI: 10.3897/zookeys.116.1347 . Reference page.