Smith, L., R. A. Long, & T. R. Sawicki. In preparation. Molecular phylogenetic data suggests the common ancestor of Gammarus lecroyae and G. mucronatus (Crustacea: Amphipoda) speciated because of terrigenous siliciclastics covering the Florida carbonate platform during the Miocene. To be submitted to the journal Organisms, Diversity and Evolution. 

Coppock, N. H., A. G. Cannizzaro, K. D. Grant, & T. R. Sawicki. (In Submission). The Florida Peninsula as an Engine of Estuarine Evolution: Insights from Gammarus daiberi (Crustacea: Amphipoda). Submitted to the Journal of Biogeography, 9 July 2025.

Sawicki, T. R., A. G. Cannizzaro & S. Dowd. 2025. Florida man exonerated: an amphipod case study on the implications of cryptic species complexes and global invasions. Biological Invasions, 27:189. https://doi.org/10.1007/s10530-025-03644-y. Obtain PDF here: https://rdcu.be/eAuVB 

Smith, L., R. A. Long, A. G. Cannizzaro, & T. R. Sawicki. 2024. Molecular phylogenetic analyses of estuarine Gammarus species (Crustacea: Amphipoda) provides support for cryptic diversity created by the formation of the Labrador Current. Invertebrate Systematics, 38, IS24003. https://doi.org/10.1071/IS24003.

Niemiller, M. L., A. G. Cannizzaro, T. R. Sawicki, & D. C. Culver. 2024. A new species of Stygobromus Cope, 1872 (Amphipoda: Crangonyctidae) from a hypotelminorheic seepage spring in Washington, D.C., USA. Journal of Subterranean Biology, 48: 117-146. doi: 10.3897/subtbiol.48.112984.

Sisco, J. M. and T. R. Sawicki. 2023. Molecular and Morphological analyses reveal a new hypogean species of amphipod in the genus Crangonyx Bate, 1859 (Crustacea: Crangonyctidae) within the floridanus species complex, from Suwannee County, Florida. Journal of Natural History, 57: 1257-1286. https://doi.org/10.1080/00222933.2023.2247155. 

Cannizzaro, A. G., J. M. Sisco, and T. R. Sawicki. 2022. Reappraisal of the Crangonyx floridanus species complex, with the description of a new species of Crangonyx Bate, 1859 (Amphipoda: Crangonyctidae) from northern Florida, USA. Journal of Crustacean Biology 42: 1-19. https://doi.org/10.1093/jcbiol/ruac027. 

Cannizzaro, A. G., J.R. Gibson, and T.R. Sawicki. 2020. A new enigmatic genus of subterranean amphipod (Amphipoda: Bogidielloidea) from Terrell County, Texas, with the establishment of Parabogidiellidae fam. nov. and notes on the family Bogidellidae. Invertebrate Systematics 34: 504–518. https://doi.org/10.1071/IS19061.

Cannizzaro, A. G., D. Balding, E. A. Lazo-Wasem, and T. R. Sawicki. 2020. A new species rises from beneath Florida: molecular phylogenetic analyses reveal cryptic diversity among the metapopulation of Crangonyx hobbsi Shoemaker, 1941 (Amphipoda: Crangonyctidae).  Organisms Diversity & Evolution 20: 387–404.  https://doi.org/10.1007/s13127-020-00433-4.

Cannizzaro, A. G., and T. R. Sawicki. 2019. Two new species of the genus Crangonyx Bate, 1859 (Amphipoda: Crangonyctidae) from the St. Marks River Basin with notes on the “Crangonyx floridanus complex”. Zootaxa, 4691(4): 301-332. https://doi.org/10.11646/zootaxa.4691.4.1 .

Cannizzaro, A. G., D. Balding, E. A. Lazo-Wasem, and T. R. Sawicki. 2019. A redescription of Hobbs’cave amphipod Crangonyx hobbsi Shoemaker, 1941 (Amphipoda: Senticaudata: Crangonyctidae) including genetic sequence data for mitochondrial and nuclear genes and notes on its ecology. Proceedings of the Biological Society of Washington, 132(1): 73-95.

Cannizzaro, A. G., D. Balding, M. Stine, and T. R. Sawicki. 2019. A new syntopic species of Stygobromus Cope, 1872 (Amphipoda: Crangonyctidae) from the Dougherty Karst Plain; with notes on Stygobromus floridanus Holsinger & Sawicki, 2016. Journal of Crustacean Biology, 39(4): 407-418. doi:10.1093/jcbiol/ruz034

Cannizzaro, A. G., D. Balding, E. A. Lazo-Wasem, and T. R. Sawicki. 2019. Morphological and molecular analyses reveal a new species of stygobitic amphipod in the genus Crangonyx (Crustacea: Crangonyctidae) from Jackson County, Florida, with a redescription of Crangonyx floridanus and notes on its taxonomy and biogeography. Journal of Natural History, 53(7-8): 425-473. doi:10.1080/00222933.2019.1584341.

Cannizzaro, A. G., D. Balding, E. A. Lazo-Wasem, and T. R. Sawicki. 2018. A Redescription of the Stygobitic Amphipod Crangonyx grandimanus (Amphipoda: Crangonyctidae) Including Phylogenetically Significant Sequence Data for Mitochondrial and Nuclear Genes. Bulletin of the Peabody Museum of Natural History, 59(2): 109-125.

Sawicki, T. R., J. R. Holsinger, E. A. Lazo-Wasem, and R. A. Long.  2017.  A new species of subterranean amphipod (Amphipoda: Gammaridae: Crangonyctidae) from Florida, with a genetic analysis of associated microbial mats.  Journal of Crustacean Biology, 37(3): 285–295.  

Lewis, J. J. and T. R. Sawicki. 2016. Mexistenasellus floridensis, new species, the first stenasellid isopod discovered from the Floridan aquifer (Crustacea: Isopoda: Asellota). Subterranean Biology, 17:121-132.

Holsinger, J. R. and T. R. Sawicki. 2016. A new species of the subterranean genus Stygobromus (Amphipoda: Crangonyctidae) from a cave spring in northern Florida, USA. Zootaxa, 4067(1): 88-94.

Yabut, M. G. and T. R. Sawicki. 2015. Idunella verrilli, a New Species of Subterranean Crustacean (Amphipoda: Gammaridea: Liljeborgiidae) from Green Bay Cave, Bermuda. Bulletin of the Peabody Museum of Natural History, 56(2): 245–253.

Holsinger, J. R., and T. R. Sawicki, and G. O. Graening. 2006. Bactrurus speleopolis, a new species of subterranean amphipod crustacean (Crangonyctidae) from caves in northern Arkansas. Proceedings of the Biological Society of Washington, 119 (1): 15-24.

Sawicki, T. R. and J. R. Holsinger. 2005.  New species and new records of weckeliid amphipod crustaceans (Hadziidae) from caves in northern Mexico, with descriptions of two new genera Paraholsingerius and Tamaweckelia.  Proceedings of the Biological Society of Washington, 118: 285-305. 

Sawicki, T. R., J. R. Holsinger and T. M. Iliffe.  2005.  New species of amphipod crustaceans in the genera Tegano and Melita (Hadzioidea: Melitidae) from subterranean groundwaters in Guam, Palau, and the Philippines.  Journal of Crustacean Biology, 25: 49-74.

Sawicki, T. R., J. R. Holsinger and B. Sket.  2005.  Redescription of the subterranean amphipod crustacean Flagitopisa philippensis (Hadzioidea: Melitidae), with notes on its unique morphology and clarification of the taxonomic status of Psammogammarus fluviatilis. The Raffles Bulletin of Zoology, 53: 59-68.

Sawicki, T. R. and J. R. Holsinger. 2004.  Systematics of the subterranean amphipod genus Bahadzia (Hadziidae), with description of a new species, redescription of B. yagerae, and analysis of phylogeny and biogeography.  Journal of Natural History, 38: 1397-1414.

Sawicki, T. R., J. R. Holsinger and T. M. Iliffe.  2004.  Four new species of the subterranean amphipod genus Hadzia (Hadziidae) from caves in the western Pacific, with a re-evaluation of the taxonomic status of the genus.  Subterranean Biology, 2: 65-90.

Ruffo, S., J. R. Holsinger & T. R. Sawicki.  2003.  Indoweckelia stocki n. sp. From subterranean waters of Northern Oman: the second weckeliid amphipod crustacean (Hadziidae)described from the Middle East. Bollettino del Museo Civico di Storia Naturale di Verona, 27:3-11.

Sawicki, T. R., J. R. Holsinger, M. Ortiz and A. Pérez.  2003. Bahadzia patilarga, a new species of subterranean amphipod (Hadziidae) from Cuba. Proceedings of the Biological Society of Washington, 116: 198-205.