Document Type



Master of Science (MS)



First Advisor's Name

Heather Bracken-Grissom

First Advisor's Committee Title

Committee chair

Second Advisor's Name

Kevin Boswell

Second Advisor's Committee Title

Committee member

Third Advisor's Name

Jennifer Rehage

Third Advisor's Committee Title

Committee member

Fourth Advisor's Name

Tamara Frank

Fourth Advisor's Committee Title

Committee Member


Sergestidae, Genomics, Genome skimming, Mitochondrial genome, Bioluminescence, Evolution

Date of Defense



The family Sergestidae provide a unique system for studying the evolution of bioluminescence, with species possessing one of three distinct forms of photophores. This study capitalizes on molecular data to construct a genus-level phylogeny of sergestid shrimp. “Genome skimming” was implemented, capturing mitochondrial genomic data across 19 species. Additional individuals were incorporated through Sanger sequencing of four partial gene regions. The -sergestes group of genera was recovered as non-monophyletic, with the -sergia group of genera being recovered as monophyletic. Ancestral state reconstructions of light organ type indicate the organs of Pesta photophore is the ancestral state for the family. Non-lensed photophores evolved once across the -sergia group, being lost in one genus. Lensed photophores evolved once within a monophyletic clade containing three genera. Patterns between light organ type and species’ depth distributions have been identified, but finer-scale depth data and increased species representation is needed to confirm these findings





Previously Published In

Golightly, C., DeLeo, D., Perez, N., Chan, T.-Y., Landeira, J., Bracken-Grissom, H.D. Accepted. Tracing the evolution of Bioluminescent light organs across the deep-sea shrimp family Sergestidae using a genomic skimming and phylogenetic approach. Invertebrate Systematics. In Press (2021)



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