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Neolema dorsalis

Neolema dorsalis

(Olivier, 1791)

Family: Chrysomelidae
Order: Coleoptera
Class: Insecta
Phylum / Division: Arthropoda
Kingdom: Animalia

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Synonyms: Lema dorsalis.





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Description


It belongs to the leaf beetle family and is characterized as a small coleopteran measuring approximately 4.5 to 6.0 millimeters in body length. It features an oblong body with a pronotum that is strongly constricted in its middle section, which is a diagnostic morphological trait of the subfamily Criocerinae. Its coloration is remarkably eye-catching, displaying a pattern where the elytra are a bright yellow or orange, divided by a distinctive metallic blue-black longitudinal stripe running along the elytral suture from the base to the posterior apex. The head and antennae are typically dark black, while the pronotum stands out due to its bright reddish-brown or orange hue. Its legs are robust and predominantly dark, efficiently adapted for clinging securely to the foliage of the plants on which it feeds.

Geographical distribution: This species has a wide Neotropical and Nearctic distribution range within the American continent. It is distributed from the southern United States, particularly in humid states such as Florida and Texas, extending throughout Mexico, Central America, and reaching various regions of South America, with confirmed biological records in countries like Colombia, Venezuela, Ecuador, Brazil, and northern Argentina. Its dispersal is highly dependent on the presence of its host plants, allowing it to colonize a wide variety of tropical and subtropical latitudes where these plant communities thrive naturally or as introduced species.

Habitat: It primarily inhabits open and humid areas, such as tropical forest edges, trail margins, seasonal wetlands, wet grasslands, agricultural fields, and urban or suburban gardens. Its presence is strictly conditioned by microclimates with moderate to high relative humidity, which favor the vigorous growth of plants belonging to the commelinaceous family. It is uncommon to find this insect in arid or desert environments unless there are artificial water sources or constant irrigation that allow the establishment of the flora on which it relies for survival.

Feeding: It is a strictly phytophagous insect in both its larval and adult stages. It specializes almost exclusively on plants in the Commelinaceae family, showing a strong preference for the genus Commelina (commonly known as dayflowers), including species such as Commelina diffusa and Commelina erecta. Adults feed by chewing the foliar tissue, leaving characteristic holes or ragged edges on the leaves. Meanwhile, the larvae voraciously consume the leaf epidermis, significantly reducing the photosynthetic capacity of the host plant when insect population densities are high.

Behavior: It exhibits predominantly diurnal habits, being highly active during the hours of peak sunlight, during which it performs short flights between plants or crawls in search of food and mates. As a passive defense mechanism against predators like birds or wasps, adults practice thanatosis, quickly dropping to the ground where they remain motionless, feigning death. However, the most astonishing behavior is displayed by the larvae, which construct a fecal shield over their dorsum using their own frass mixed with glandular secretions. This shield acts as a highly unpleasant physical and chemical barrier that effectively deters attacks from ants and other natural predators.

Reproduction: The reproductive cycle begins with courtship and mating on the upper or lower surfaces of the host leaves. After fertilization, the female deposits small, oblong, yellow-orange eggs, which she glues individually or in small aligned clusters on the underside of the host leaves, ensuring an immediate food source for the offspring. After an incubation period of just a few days, the larvae emerge and pass through several developmental instars while feeding continuously. At the end of the larval stage, they construct a whitish, frothy, parchment-like pupa (puparium) attached to the plant stems or among leaf litter on the ground, where they undergo complete metamorphosis until the emergence of the new adult.

Conservation status: Currently, this species has not been evaluated by the International Union for Conservation of Nature (IUCN), and therefore lacks an official category on the Red List. However, due to its vast geographical distribution, its adaptability to human-modified environments, and the abundance of its host plants, its populations are considered stable and do not face significant threats that jeopardize its survival in the medium or long term.



Compilation and publication: EcoRegistros – 30/09/2026




Geographic distribution


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Species photographs

Count: 70

Foto
Photography ID: 673362
  Adult

Vicente López
Buenos Aires
Argentina
02/16/2026
Marcos Garberoglio
Foto
Photography ID: 666686
  Adult

Rosario
Santa Fe
Argentina
01/10/2026
Peter Vidana
Foto
Photography ID: 615868
  Adult

Paraná
Entre Ríos
Argentina
11/02/2024
Néstor Trossero
Foto
Photography ID: 610844
 
San Miguel, capital
Tucumán
Argentina
11/23/2024
Viviana Fuentes
Foto
Photography ID: 610825
 
San Miguel, capital
Tucumán
Argentina
11/24/2024
Viviana Fuentes
Foto
Photography ID: 610795
 
San lorenzo 3100
Tucumán
Argentina
11/24/2024
Viviana Fuentes
Foto
Photography ID: 588351
  Adult

Carcarañá
Santa Fe
Argentina
01/21/2021
Adrian Braidotti
Foto
Photography ID: 580510
  Adult

Tucumán
Tucumán
Argentina
04/14/2024
Viviana Fuentes
Foto
Photography ID: 573368
 
Villa Giardino
Córdoba
Argentina
01/31/2024
Eduardo Nadal
Foto
Photography ID: 534909
  Adult

Cumana
Sucre
Venezuela
02/11/2023
José Ramón Goméz
Foto
Photography ID: 530182
  Adult

San Esteban
Córdoba
Argentina
03/02/2023
Eduardo Nadal
Foto
Photography ID: 530181
  Adult

San Esteban
Córdoba
Argentina
03/02/2023
Eduardo Nadal



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Species vocalizations

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Species reports



 Detail of places sorted by number of records






Species records

Count: 96



Page 1 of 10
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
244592614/03/202608:19ArgentinaSanta FeRaúl Tacca 640, Santa Fe de la Vera Cruz1Gustavo Fernando Durán
244407208/03/202609:04ArgentinaSanta FeSarmiento 1362, San Jerónimo Norte1Gustavo Fernando Durán
244040301/03/202607:50ArgentinaSanta FeEduardo Tesaire2Gustavo Fernando Durán
243452916/02/2026ArgentinaBuenos AiresÁrea Natural Yrigoyen (Yrigoyen y el Río), Vicente LópezMarcos Garberoglio
241343410/01/2026ArgentinaSanta FeCentro, RosarioPeter Vidana
240846101/01/202608:58ArgentinaSanta FeRuta Provincial 50S1Gustavo Fernando Durán
226494623/03/202508:18ArgentinaSanta FeSarmiento 1362, San Jerónimo Norte1Gustavo Fernando Durán
225090915/02/202512:38ArgentinaCórdobaVilla de las Rosas1Gustavo Fernando Durán
223862919/01/202517:43ArgentinaSanta FeSan Jerónimo Norte1Gustavo Fernando Durán
222836901/01/2025ArgentinaSanta FeSarmiento 1362, San Jerónimo Norte2Gustavo Fernando Durán
Page 1 of 10

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Recommended citation
Please use the following reference when citing this species account.
EcoRegistros. 2026. Neolema dorsalis – Species account. Accessed from www.ecoregistros.org on 10/10/2026.