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Tropisternus lateralis
	Adult Tropisternus lateralis
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Coleoptera
Family:	Hydrophilidae
Genus:	Tropisternus
Species:	T. lateralis
Binomial name
	Tropisternus lateralis; (Fabricius, 1775)

Tropisternus lateralis is a species of hydrophilid beetle that ranges across much of the Americas.^[1]

Description

Adult T. lateralis nimabatus, the subspecies found in the eastern United States, are distinguished by having uniformly dark elytra and pronotum with light-colored borders.^[1]

Distribution

The range of T. lateralis includes North America as far north as southern Canada, South America south to northern Chile and Argentina, the Caribbean, and the Galápagos Islands.^[1]^[2] T. lateralis humeralis has been accidentally introduced to Oahu.^[3]

Behavior

T. lateralis exhibits stridulation during stress, calling, and courtship.^[4] Eggs are deposited in cases under water, and larvae are fully aquatic. While adults are primarily aquatic, they breathe air and can fly.^[1] Adult T. lateralis avoid colonizing and laying egg cases in ponds that contain fish, which are potential predators of all life stages of the beetles.^[5]

Subspecies

There are five recognized subspecies of Tropisternus lateralis.^[6]

T. lateralis humeralis Motschulsky, 1850
T. lateralis lateralis (Fabricius, 1775)
T. lateralis limbalis (LeConte, 1855)
T. lateralis limbatus (Brullé, 1837)
T. lateralis nimbatus (Say, 1823)

References

^ ^a ^b ^c ^d Spangler, Paul J. (1960). A revision of the genus Tropisternus (Coleoptera:Hydrophilidae) (Ph.D.). University of Missouri.
^ "Tropisternus lateralis". Charles Darwin Foundation. Retrieved July 17, 2015.
^ Hansen, Michael (1995). "A review of the Hawaiian Hydrophilidae (Coleoptera)". Pacific Science. 49 (3): 266–288.
^ Ryker, Lee C. (1976). "Acoustic behavior of Tropisternus ellipticus, T. columbianus, and T. lateralis limbalis in western Oregon (Coleoptera: Hydrophilidae)". The Coleopterists Bulletin. 30 (2): 147–156.
^ Resetarits, Jr., William J. (2001). "Colonization under threat of predation: avoidance of fish by an aquatic beetle, Tropisternus lateralis (Coleoptera: Hydrophilidae)" (PDF). Oecologia. 129: 155–160. doi:10.1007/s004420100704. Archived (PDF) from the original on July 22, 2015.
^ "Tropisternus lateralis (Fabricius, 1775)". ITIS. Retrieved July 17, 2015.

[Spangler-1] Spangler, Paul J. (1960). A revision of the genus Tropisternus (Coleoptera:Hydrophilidae) (Ph.D.). University of Missouri.

[2] "Tropisternus lateralis". Charles Darwin Foundation. Retrieved July 17, 2015.

[3] Hansen, Michael (1995). "A review of the Hawaiian Hydrophilidae (Coleoptera)". Pacific Science. 49 (3): 266–288.

[4] Ryker, Lee C. (1976). "Acoustic behavior of Tropisternus ellipticus, T. columbianus, and T. lateralis limbalis in western Oregon (Coleoptera: Hydrophilidae)". The Coleopterists Bulletin. 30 (2): 147–156.

[5] Resetarits, Jr., William J. (2001). "Colonization under threat of predation: avoidance of fish by an aquatic beetle, Tropisternus lateralis (Coleoptera: Hydrophilidae)" (PDF). Oecologia. 129: 155–160. doi:10.1007/s004420100704. Archived (PDF) from the original on July 22, 2015.

[6] "Tropisternus lateralis (Fabricius, 1775)". ITIS. Retrieved July 17, 2015.

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