Overview

Brief Summary

Introduction

Introduction:

Riodinidae are a pantropical family, with the majority of species occurring in the neotropics.

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Dana Campbell

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Introduction

Riodinidae are a pantropical family, with the majority of species occurring in the neotropics.

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Comprehensive Description

Nomenclature

Although Erycinidae Swainson 1827 appears to be a senior name to Riodinidae Grote 1895, the type genus Erycina Fabricius 1807 is a junior homonym of Erycina Lamarck 1805 (a genus of bivalve mollusk). A family-group name cannot be based on a generic name that is a junior homonym (ICZN Article 39), so Swainson's Erycinidae is invalid. The Commission ruled (ICZN opinion 1073, 1977) that the family group name for this taxon should be Riodinidae Grote 1895 (1827), based on the replacement generic name Riodina that was selected by Westwood [1851], even though there are alternative family-group names with priority (e. g., Nemeobiinae Bates [1868]; Mesosemiini Bates 1859). (Bates employed Erycinidae as the family-group name for these subordinate taxa). This is one of the more confusing puzzles in butterfly nomenclature.

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Distribution

Geographical Distribution

Geographic Range:

Nearctic, Palearctic, Oriental, Ethiopian, Neotropical, Australian, Oceanic Island

Geographic Range description:

World-wide distribution, but occur mostly in the Neotropics.

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Dana Campbell

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Physical Description

Morphology

Egg morphology

Texture:

smooth, ridged

Egg mass pattern:

Almost nothing about oviposition patterns and clutch sizes is known for riodinids.  Rearing records suggest that most females lay single eggs. Some species of Euselasia, Melanis, and Emesis lay clusters of eggs, and some species (Eurybia, Ancyluris, Emesis, Thisbe, Theope, and Nymphidium) show variation in the numbers of eggs they lay - sometimes a single egg, and sometimes multiple (DeVries et al 1994)  Many riodinids defend their eggs by laying them in crevices in bark, leaves or off the host plant, so as to be protected from parasitoids. Some riodinids also have evolved protective interactions with ants, and only lay their eggs where the appropriate ant species is found.

Description of egg morphology:

Riodinid eggs are remarkably varied, many are distinct from all other butterfly eggs. Downey and Allyn (1981) put together a terminology of 7 disctinct forms of lycaenid eggs that is also useful in describing riodinid eggs. 1. "echinoid shape" (Emesis tenedia, Synargis phylleus) 2. "fustrum shape" - a cone with the top sliced off (Euselasia; unusual among butterflies) 3. "tiarate" or crown shaped (Symmachia tricolor) 4. Single flattened pie (Eurybia) 5. Two stacked pies (Lasaia) 6. An ornate pastry (Helicopis and Nymphidium) 7. A soccer ball enclosed in a net bag (Thisbe, Juditha, Synargis) Riodinid and lycaenid eggs differ in that riodinids typically do not have plastrons (highly porous areas of the chorion) that are numerous on lycaenid eggs. DeVries, 1997.

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Dana Campbell

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Larvae Morphology

Larval head description:

Harvey 1987 notes that a character unique to the Riodinidae is the presence of more than two mandibular setae.

Secondary setae:

present

Larval body description:

Often onisciform and frequently hairy.

Spinneret:

present

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Dana Campbell

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Pupa/Cocoon morphology

Pupa type:

adecticous, obtect

Pupa description:

Overall shape and manner of pupation shows great variability in the Riodinidae. Some are round and squat (Euselasia), some blocky and angular (Leucochimona, Mesosemia), some bear lateral spines (Ancyluris, Necyria), some are smoothly elongate (Theope), some are very similar to lycaenid pupae (Chalodeta), some are enclosed in a cocoon (Anteros, Sarota), some are suspended as are Nymphalid pupae (Emesis, Lepricornis).   Harvey (1987) documented that the silk girdle passes across A1 in most Riodinidae (and all Pieridae). The exceptions to this are that the silk girdle passes across A2 in members of the Mesosemia, and in the genus Apodemia and some Emesis, the silk girdle passes across the interface of T3 and A1.  DeVries (1996) notes that the cremaster of riodinid pupae is often broader than the cremaster in other butterflies. This trait often allows for a quick way to identify pupae in the field.  Riodinid butterflies have cryptic pupae. Some riodinid pupae have abdominal stridulatory organis, indicating that they may (like some lycaenid pupae) produce sounds that might function in dissuading predators.

Cremaster:

present

Cocoon:

absent

Cocoon description:

While most riodinids pupate without a cocoon, some genera (Anteros, Sarota) are enclosed within a cocoon composed of the long setae from the caterpillar.

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Dana Campbell

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Adult Thorax Morphology

Forelegs:

normal, reduced

Leg description:

The male forelegs are reduced, with the tarsomeres fused and pretarsi rarely bearing claws. Not used for walking (Robbins 1988). The coxa extends as a spine-like structure to below the articulation point of the trochanter. (From Scoble, 1992)

Forewing description:

Many species are brightly colored and wing-shape is diverse.

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Dana Campbell

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Life History and Behavior

Behavior

Larval Behavior

Larval behavior:

Larvae of some species within the tribes Eurybiini, Lemoniini, and Nymphidiini are associated with ants.  Some caterpillars from the subfamily Euselasiinae are gregarious feeders. Species with semi-gregarious behaviors can be found in the tribes Eurybiini, Riodinini, Emesini, Lemoniini, Nymphidiini (all subfamily Riodininae). DeVries et al 1994.

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Dana Campbell

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Reproduction

Life History: Immature Stages

Pupa life history description:

Riodinids usually pupate as solitary individuals. They may pupate in leaf litter, crannies in tree bark, rolled leaves, and some even in ant nests. Some species of Hades, Euselasia, and Emesis do pupate gregariously.

Larval food items include:

Highly diverse diet. Include:

Larval food habits description:

Among all the butterflies, riodinids and lycaenids have the broadest range of food items, including plant leaves and flowers, insects, insect secretions. They also show great diversity in terms of their patterns of host use, ranging from specialist feeders (e.g. THisbe irenea), to generalists which may feed on plants fro more than a dozen families.

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Dana Campbell

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Evolution and Systematics

Evolution

Systematic and taxonomic history

Systematic and taxonomic history:

Nomenclature: Although Erycinidae Swainson 1827 appears to be a senior name to Riodinidae Grote 1895, the type genus Erycina Fabricius 1807 is a junior homonym of Erycina Lamarck 1805 (a genus of bivalve mollusk). A family-group name cannot be based on a generic name that is a junior homonym (ICZN Article 39), so Swainson's Erycinidae is invalid. The Commission ruled (ICZN opinion 1073, 1977) that the family group name for this taxon should be Riodinidae Grote 1895 (1827), based on the replacement generic name Riodina that was selected by Westwood [1851], even though there are alternative family-group names with priority (e. g., Nemeobiinae Bates [1868]; Mesosemiini Bates 1859). (Bates employed Erycinidae as the family-group name for these subordinate taxa). This is one of the more confusing puzzles in butterfly nomenclature.  The Riodinidae have been included in the Lycaenidae as the subfamily Riodininae by Ehrlich (1958) and by Kristensen (1976).

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Dana Campbell

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Discussion of Phylogenetic Relationships

View Riodinidae Tree

The tree shown is implied by classifications of Harvey (1987), Corbet et al. (1992), Campbell et al. (2000), Hall (2003) and Lamas (2004), and should be viewed as an informal hypothesis in need of corroboration.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage

Barcode of Life Data Systems (BOLD) Stats
                                        
Specimen Records:3,554Public Records:2,002
Specimens with Sequences:3,150Public Species:153
Specimens with Barcodes:3,030Public BINs:145
Species:356         
Species With Barcodes:308         
          
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Barcode data

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Locations of barcode samples

Collection Sites: world map showing specimen collection locations for Riodinidae

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Wikipedia

Riodinidae

The Riodinidae (or metalmarks) are a family of butterflies. The common name "metalmarks" refers to the small metallic-looking spots commonly found on their wings. There are 1532 species in 146 genera species of metalmark butterflies in the world.[1] Although mostly neotropical in distribution, the family is represented both in the Nearctic and the Old World.

Description[edit]

The family includes small to medium-sized species, from 12 to 60 mm wingspan, often with vibrant structural colouring. The wing shape is very different within the family. They often remember butterfly other groups, some resemble Satyrinae, some are bright yellow reminiscent of Coliadinae and again others (examples Barbicornis, Rhetus arcius, Helicopis, Chorinea) have tails as do Papilionidae . The colouration ranges from muted colours in the temperate zone species to iridescent blue and green wings and transparent wings in tropical species[2] The golden or silvery metallic spots on the wings in many species of the Americas gave them the English common name "Metalmarks". A number of species mimic poisonous moths of several families and there are often extensive mimicry rings of similar-looking species, grouped around a model.[3] Mimicry causes are often closely related species to have completely different wing patterns, for example the genus Thisbe[4] Many species mimic the stain and stripe pattern of toxic (Nymphalidae). Batesian mimicry seems to be more common than in any other insect family of similar size[5] Reasons for this are unknown.Another example is Ithomeis where different subspecies resemble the species they mimic in different parts of the geographic range more than they resemble each other.

The delimitation from the closely related Lycaenidae by morphological autapomorphy is difficult .[6] The first pair of legs of the males, which arises on the prothorax, is less than half as long as the legs of the pterothorax and they are not used for walking. The individual segments of the tarsus are sometimes fused together and fused with the tibia, and the pretarsi have no claws. This feature is also found in some Lycaenidae(and also the Monotrysia), but in these the legs are always much longer. The sensory hairs on the tarsi of the female forelimbs are arranged in a group. These groups which are arranged in pairs can be found in the other taxa of the Papilionoidea. The third problematic apomorphy is the absence of the rear projections (apophyses) of the female genitalia. This feature (absence) is found as well in some species of the subfamily of Poritiinae.

In almost all Riodinidae, the coxae of the front legs are extended males jutting out over the trochanter (only hinted at in Styx infernalis and Corrachia leucoplaga ). If there are similar projections in Lycaenidae (in genera Curetis, Feniseca, Poritia), they are built differently in detail and may be, for example dorsally convex ).[7] In addition, almost all Riodinidae in contrast to the Lycaenidae have a humeral vein in the hind wings and the costa is thickened (exceptions in the subfamily Hamearinae). The head in relation to the eyes is wider than in Lycaenidae, making the antennal bases further away from the eye. The relatively long antennae often reach half of the front wing length.

Riodinidae have an unusual variety in chromosome numbers, only some very basal groups have the number typical for butterflies (n = 29-31) or the n characteristic of Lycaenidae (n = 23 to 24). Numbers between 9 and 110 occur. In some cases, representatives of a morphologically indistinguishable cryptospecies have different chromosome numbers and are reproductively isolated.

Distinguishing features[edit]

Like the lycaenids, the males of this family have reduced forelegs while the females have full-sized, fully functional forelegs. The foreleg of males is often reduced and has a uniquely shaped first segment (the coxa) which extends beyond its joint with the second segment, rather than meeting it flush. They have a unique venation on the hindwing: the costa of the hind wing is thickened out to the humeral angle and the humeral vein is short.[8]

Taxonomy and systematics[edit]

Riodinidae is currently treated as a distinct family within the superfamily Papilionoidea, but in the past they were held to be the subfamily Riodininae of the Lycaenidae. Earlier, they were considered to be part of the now defunct family Erycinidae, whose species are divided between this family and the subfamily Libytheinae.

Today, most systematists prefer to accept an independent family even if there are counter-arguments.[9] Based on morphological studies Ackery et al.[10] in the manual of Zoology (Kristensen 1998, cf. literature) placed Riodininae within the Lycaenidae. Kristensen et al.[11] accepted the updating of the manual in 2007 raising the classification to family rank at least on a provisional basis .

Molecular phylogenetics(based on homologous DNA sequences) establishes a sister group relationship between the Riodinidae and the Lycaenidae accepted almost unanimously.[12][13][14]

Subfamilies[edit]

The family Riodinidae consists of three subfamilies. They are:

Genera of uncertain position[edit]

Several genera, namely from the Old World, are of more uncertain affiliations; some of them are monotypic. Such Riodinidae incertae sedis are:[16]

The fossil genus Lithopsyche is sometimes placed here but sometimes in the Lycaenidae.

Amazonas tropical rainforest is the habitat for most species of Riodinidae

Biology[edit]

Species occur in a variety of different habitats, but have a unique distribution focus in the tropical rain forests of South America.[17] Many species are rarely found and have a relatively small distribution area. Species of the genus Charis were therefore used to reconstruct the history of the forest of the Amazon basin: each of the 19 species has a vicariant distribution area, three originally separate forests (upper, lower Amazonas, Guyana) can be derived from the relationship of between the species.[18]

The food plants for the caterpillars include total more than 40 different plant families. Mostly young leaves or flowers are used rarely fallen, dead leaves or lichen. The larvae feed mostly individually not gregariously.

The larva of Setabis lagus (Riodininae: Nymphidiini), is predatory. There are records of predation on larvae of Horiola sp. (family Membracidae) as well as scale insects (Coccidae). Predatory feeding of some other species is suspected but not proven.[19]

A study in Ecuador based on adult male feeding records for 124 species in 41 genera of Riodinidae (out of a total of 441 species in 85 genera collected in the study) demonstrated that rotting fish and other carrion was the most frequently used food source in terms of numbers of individuals and taxa, attracting 89 species from 32 genera. Other food substrates visited in this study included flowers, damp sand or mud puddling[20]

Life cycle[edit]

The eggs vary in shape but often appear round and flattened, some have the shape of a dome or a turban.They are similar to the eggs of Lycaenidae. The caterpillars are usually hairy, plump, and are the common overwintering stage. The caterpillars are usually longer than those of the Lycaenidae except in the myrmecophilous species.Pupae are hairy and attached with silk to either the host plant or to ground debris or leaf litter. There is no cocoon.

Several genera of Riodinidae have evolved intimate associations with ants, and their larvae are tended and defended by ant associates. This also is the case with several linages of Lycaenidae and contributed to arguments for the uniting the two families. It is now recognized that myrmecophily arose several times among Riodinidae and Lycaenidae clades.But there are counter arguments.

Like their sister family Lycaenidae, numerous species of Riodinidae are myrmecophiles (involving about 280 ant species). The larvae of many species have special organs, of which have a soothing or tempting effect on ants. Many Riodinidae larvae have so-called "tentacle nectar organs" on the eighth segment of the abdomen that secrete a fluid which is eaten by ants. Other tentacle bodies on the third abdominal segment have been shown to emit allomones which influence ants. Other studies suggest in addition acoustic signals. The location of these organs matches similar bodies in Lycaenidae caterpillars and the similar histological structure indicate homologous origin. It is possible that the common ancestor of the Lycaenidae and Riodinidae could have been myrmecophilous.The adaptations were then lost in some species.[21] The data may however indicate that three different lines of the Riodinidae, independently developed myrmecophily (an example of convergent evolution).[22]

Foodplants[edit]

The larvae feed preferentially on plants of the families Araceae, Asteraceae, Bromeliaceae, Bombacaceae, Cecropiaceae, Clusiaceae, Dilleniaceae, Euphorbiaceae, Fabaceae, Lecythidaceae, Loranthaceae, Malpighiaceae, Marantaceae, Melastomataceae, Myrtaceae, Orchidaceae, Rubiaceae, Sapindaceae, Zingiberaceae as well as bryophytes and lichens.[23]

Economic significance[edit]

The importance of Riodinidae species considered pests is very low. Some species of Euselasiinae feed on Myrtaceae of economic importance such as guava. A few Riodininae are specified as harmful to farmed Bromeliceae or Orchidaceae.

Footnotes[edit]

  1. ^ Erik J. van Nieukerken, Lauri Kaila, Ian J. Kitching, Niels P. Kristensen, David C. Lees, Joël Minet, Charles Mitter, Marko Mutanen, Jerome C. Regier, Thomas J. Simonsen, Niklas Wahlberg, Shen-Horn Yen, Reza Zahiri, David Adamski, Joaquin Baixeras, Daniel Bartsch, Bengt Å. Bengtsson, John W. Brown, Sibyl Rae Bucheli, Donald R. Davis, Jurate De Prins, Willy De Prins, Marc E. Epstein, Patricia Gentili-Poole, Cees Gielis, Peter Hättenschwiler, Axel Hausmann, Jeremy D. Holloway, Axel Kallies, Ole Karsholt, Akito Y. Kawahara, Sjaak (J.C.) Koster, Mikhail V. Kozlov, J. Donald Lafontaine, Gerardo Lamas, Jean-François Landry, Sangmi Lee, Matthias Nuss, Kyu-Tek Park, Carla Penz, Jadranka Rota, Alexander Schintlmeister, B. Christian Schmidt, Jae-Cheon Sohn, M. Alma Solis, Gerhard M. Tarmann, Andrew D. Warren, Susan Weller, Roman V. Yakovlev, Vadim V. Zolotuhin, Andreas Zwick (2011): Order Lepidoptera Linnaeus, 1758. In: Zhang, Z.-Q. (Editor) Animal biodiversity: An outline of higher-level classification and survey of taxonomic richness. Zootaxa 3148: 212-221.
  2. ^ Thomas C. Emmel, Edward S. Ross (Hrsg.): Wunderbare und geheimnisvolle Welt der Schmetterlinge. 1. Auflage. Bertelsmann, Gütersloh und Berlin 1976 (übersetzt von Irmgard Jung), ISBN 3-570-00893-2.
  3. ^ Mathieu Joron (2008): Batesian Mimicry: Can a Leopard Change Its Spots — and Get Them Back? Current Biology Volume 18, Issue 11: R476–R479. doi:10.1016/j.cub.2008.04.009
  4. ^ Carla M. Penz & Philip J. DeVries (2001): A phylogenetic reassessment of Thisbe and Uraneis butterflies (Riodinidae, Nymphidiini). Contributions in Science 485: 1-27.
  5. ^ K.S. Brown Jr., B. von Schoultz, A.O. Saura, A. Saura (2012): Chromosomal evolution in the South American Riodinidae (Lepidoptera: Papilionoidea). Hereditas 149: 128–138. doi:10.1111/j.1601-5223.2012.02250.x ..
  6. ^ Rienk de Jong, Philip R. Ackery, Richard I. Vane-Wright (1996):The higher classification of butterflies (Lepidoptera): problems and prospects. Insect Systematics & Evolution, Volume 27, Issue 1: 65 – 101. doi:10.1163/187631296X00205.
  7. ^ Robert K. Robbins (1988): Comparative morphology of the butterfly foreleg coxa and trochanter (Lepidoptera) and its systematic implications. Proceedings of the Entomological Society of Washington 90 (2): 133-154..
  8. ^ Borror et al. (1989)
  9. ^ Zhao F, Huang DY, Sun XY, Shi QH, Hao JS, Zhang LL, Yang Q. (2013): The first mitochondrial genome for the butterfly family Riodinidae (Abisara fylloides) and its systematic implications. Zoological Research 34 (E4−5): E109−E119. doi:10.11813/j.issn.0254-5853.2013.E4−5.E109
  10. ^ Philip R. Ackery, Rienk de Jong, Richard I. Vane-Wright: The Butterflies: Hedyloidea, Hesperioidea, Papilionoidea. In: Niels P. Kristensen (editor): Lepidoptera, Moths and Butterflies. Volume 1: Evolution, Systematics, and Biogeography. Walter de Gruvter, Berlin & New York 1999. vgl. pp. 283-284
  11. ^ Niels P. Kristensen, Malcolm J. Scoble, Ole Karsholt (2007): Lepidoptera phylogeny and systematics: the state of inventorying moth and butterfly diversity. Zootaxa 1668: 699–747.
  12. ^ Dana L. Campbell and Naomi E. Pierce (2003): Phylogenetic relationships of the Riodinidae: Implications for the evolution of ant association. In: C. Boggs, P. Ehrlich, W.B. Watt (editors). Butterflies as Model Systems. Chicago University Press: 395-408. download
  13. ^ Niklas Wahlberg, Michael F Braby, Andrew V.Z Brower, Rienk de Jong, Ming-Min Lee, Sören Nylin, Naomi E Pierce, Felix A.H Sperling, Roger Vila, Andrew D Warren and Evgueni Zakharov (2005): Synergistic effects of combining morphological and molecular data in resolving the phylogeny of butterflies and skippers. Proceedings of the Royal Society Series B 272: 1577-1586. doi:10.1098/rspb.2005.3124
  14. ^ aria Heikkilä, Lauri Kaila, Marko Mutanen, Carlos Peña, Niklas Wahlberg (2012) Cretaceous origin and repeated tertiary diversification of the redefined butterflies. Proceedings of the Royal Society Series B 279: 1093-1099. doi:10.1098/rspb.2011.1430
  15. ^ Hall, J.P.W. (2004b)
  16. ^ See Savela (2007) for references.
  17. ^ J.P.W. Hall (2004): Metalmark Butterflies (Lepidoptera: Riodinidae) In J.L. Capinera (editor) Encyclopedia of Entomology, Vol. 2 Kluwer Academic Publishers, 2004. pp. 1383–1386.
  18. ^ Jason P.W. Hall & Donald J. Harvey (2002): The phylogeography of Amazonia revisited: new evidence from Riodinid butterflies. Evolution, 56(7): 1489–1497.
  19. ^ P.J. DeVries, I.A. Chacon, D. Murray (1992): Toward a better understanding of host use and biodiversity in riodinid butterflies (Lepidoptera). Journal of Research on the Lepidoptera 31(1-2): 103-126.
  20. ^ Jason P.W. Hall & Keith R. Willmott (2000): Patterns of feeding behaviour in adult male riodinid butterflies and their relationship to morphology and ecology. Biological Journal of the Linnean Society 69: 1–23. doi:10.1006/bijl.1999.0345.
  21. ^ Dana L. Campbell and Naomi E. Pierce (2003): Phylogenetic relationships of the Riodinidae: Implications for the evolution of ant association. In: C. Boggs, P. Ehrlich, W.B. Watt (editors). Butterflies as Model Systems. Chicago University Press: 395-408. download
  22. ^ Jonathan Walter Saunders: Molecular Phylogenetics of the Riodinidae (Lepidoptera). Thesis, University of Florida, 2010.
  23. ^ DeVries (2001)

References[edit]

Further reading[edit]

  • Charles A. Bridges, 1994. Catalogue of the family-group, genus-group and species-group names of the Riodinidae & Lycaenidae (Lepidoptera) of the world Urbana, Ill. :C.A. Bridges pdf
  • Campbell, D. L. & Pierce, N. E. 2003: Chapter 18: Phylogenetic Relationships of the Riodinidae:Implications for the Evolution of Ant Association. Pp. 395–408. – In: Boggs, C. L.,Watt, B. & Ehrlich, P. R. (eds): Butterflies. Ecology and Evolution Taking Flight. The University of Chicago Press, Cambridge University Press, Chicago and London pdf
  • Glassberg, Jeffrey Butterflies through Binoculars, The West (2001)
  • Guppy, Crispin S. and Shepard, Jon H. Butterflies of British Columbia (2001)
  • James, David G. and Nunnallee, David Life Histories of Cascadia Butterflies (2011)
  • Pelham, Jonathan Catalogue of the Butterflies of the United States and Canada (2008)
  • Pyle, Robert Michael The Butterflies of Cascadia (2002)
  • Seitz, A., 1916. Family:Erycinidae. In A. Seitz (editor), Macrolepidoptera of the world,vol. 5: 617–738. Stuttgart: Alfred Kernen.[1] also available as pdf. Out of date but very useful.
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