Leptotes cassius

(Cramer, 1775)

Cassius blue, tropical striped blue

Leptotes cassius is a small, strikingly in the , distributed across the southern United States, Caribbean, Mexico, Central America, and South America. The exhibits facultative , with tended by , though ant presence does not significantly influence decisions. are florivorous, developing inside flower of leguminous plants. Multiple are recognized, with L. c. theonus serving as the species of the Leptotes.

Leptotes cassius by (c) Helio Lourencini, some rights reserved (CC BY), uploaded by Helio Lourencini. Used under a CC-BY license.

Leptotes cassius by leppyone. Used under a CC BY 2.0 license.

Cassius Blue. Leptotes cassius - Flickr - gailhampshire by gailhampshire from Cradley, Malvern, U.K. Used under a CC BY 2.0 license.

Pronunciation

How to pronounce Leptotes cassius: //lɛpˈtoʊˌtiːz ˈkæs.i.əs//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

A tiny with wingspan 20–35 mm. The can be distinguished from similar blues by its distribution and association with tropical and subtropical . Specific pattern details are not provided in available sources.

Images

Habitat

Tropical and subtropical environments including peninsular Florida, Caribbean islands, and Brazilian cerrado. Associated with open, sunny areas where plants grow.

Distribution

to North America in Florida (including the Florida ) and Texas, southward through the Caribbean, Mexico, Central America to South America. Strays have been recorded in New Mexico, Kansas, Missouri, South Carolina, North Carolina, and Virginia. L. c. theonus occurs in Florida, Cuba, Bahamas, and Greater Antilles; L. c. cassidula ranges from Texas through Mexico to Panama; L. c. cassius occurs in Suriname and Trinidad & Tobago.

Diet

are florivorous, feeding on flowers. Documented plants in the Fabaceae include Amorpha crenulata, Crotalaria incana (woolly rattlepod), Galactia regularis, and Phaseolus lunatus (lima bean). Larvae can also develop on Plumbago auriculata (Cape leadwort) and P. scandens (doctorbush) in the Plumbaginaceae, though these are not closely related to typical hosts.

Host Associations

Amorpha crenulata - larval Fabaceae
Crotalaria incana - larval woolly rattlepod, Fabaceae
Galactia regularis - larval Fabaceae
Phaseolus lunatus - larval lima bean, Fabaceae
Plumbago auriculata - larval Cape leadwort, Plumbaginaceae; not closely related to typical Fabaceae
Plumbago scandens - larval doctorbush, Plumbaginaceae
Bionia coriacea - extrafloral nectaried legume shrub in Brazilian cerrado
Camponotus - mutualistic partner tend through active on last body ; facultative

Life Cycle

are laid on plants. develop inside flower , which may provide protection from . Larvae are tended by through active on their last body . presumably occurs within or near host plants, though specific details are not documented in available sources.

Behavior

Exhibits facultative : are tended by , but ant presence is not a statistically significant cue for . Ant attendance involves active on the last body of . No of immatures was observed regardless of ant presence or absence, suggesting limited protective benefit from ant association in this system.

Ecological Role

As a florivorous , consume flowers of leguminous plants. The facultative association represents a weak where ant partners appear to play a minor role in occurrence.

Human Relevance

Featured in Marisha Pessl's 2006 novel Special Topics in Calamity Physics; the protagonist van Meer was named in honor of the Cassius blue.

Similar Taxa

Leptotes marinaMarine , also in Leptotes; similar size and blue coloration but differs in distribution and associations
Hemiargus ceraunusCeraunus , similar small blue lycaenid in overlapping range; distinguished by pattern and preferences
Cyclargus ammonOther small in similar ; precise distinguishing features require examination of patterns and

More Details

Subspecies

Six recognized: L. c. cassius (Suriname, Trinidad & Tobago), L. c. catilina, L. c. theonus (Florida, Cuba, Bahamas, Greater Antilles; of Leptotes), L. c. cassidula (Texas, Mexico, Honduras to Panama), L. c. cassioides (Windward Islands including Dominica), and L. c. striata.

Myrmecophily research

Experimental study in Brazilian cerrado found that while -tended showed tendency for higher abundance, ant presence was not a statistically significant cue for , and no immatures were parasitized regardless of ant presence, indicating ants play a minor role in this facultatively myrmecophilous system.