Scarabaeinae

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Scarabaeinae
Temporal range: 53–0  Ma [1]
Copris lunaris. MHNT.jpg
Copris lunaris (Coprini)
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Scarabaeidae
Subfamily: Scarabaeinae
Latreille, 1802
Tribes
Synonyms

Coprinae

The scarab beetle subfamily Scarabaeinae consists of species collectively called true dung beetles (there are also dung beetles in other subfamilies and families). Most of the beetles of this subfamily feed exclusively on dung. However, some may feed on decomposing matter including carrion, decaying fruits and fungi. Dung beetles can be placed into three structural guilds based on their method of dung processing namely rollers (telecoprids), dwellers (endocoprids) and tunnelers (paracoprids). [3] Dung removal and burial by dung beetles result in ecological benefits such as soil aeration and fertilization; improved nutrient cycling and uptake by plants, increase in Pasture quality, biological control of pest flies and intestinal parasites and secondary seed dispersal. [4] Well-known members include the genera Scarabaeus and Sisyphus , and Phanaeus vindex .

Contents

Description

Adult dung beetles have modified mouth parts which are adapted to feeding on dung. The clypeus is expanded and covers the mouth parts. The elytra, which cover the wings, expose the pygidium. They also have a space between their middle legs to allow for manipulation of the dung. Dung beetles can be large beetles of a few inches in size to small beetles which are only a few millimeters in size [5]

Guilds

Dung beetles are classified into groups based on their method of processing the dung. Rollers are beetles that construct balls of dung from the main food source. They roll away this ball from the position of the original food source and use the dung for feeding or for reproduction. Tunnelers are beetles that dig tunnels beneath the food source creating nests. They relocate food into their nest for reproduction and feeding. Lastly, dwellers are beetles that live and reproduce inside the food source rarely creating nests. [3]

Reproduction

Pheromones are thought to aid in dung beetle reproduction. Dung beetles copulate after which both parents dig a tunnel to lay the eggs. This tunnel may have different branches leading to varying egg chambers or may not be branched depending on species. Both parents take dung inside the tunnels in the form of brood balls and the females lay the egg inside the dung. When the larva hatches it feeds on the surrounding dung and forms a pupa undergoing several instars. After this stage the pupa hatches and the newly formed adult evades the tunnel and searches for a fresh dung supply for feeding. After approximately 2 weeks the new adult beetle will be able to reproduce.[ citation needed ]

Ecology

Dung beetle communities are dependent on vegetation and presence of mammalian dung resource. In an area with a lot of vegetation, the dung pads are preserved longer for dung beetle utilization. Vegetation provides conditions suitable for vertebrate trafficking allowing more dung presence in the area. In areas with little vegetation, limited vertebrate fauna may be present limiting the types of dung present. Also, with little vegetation the canopy of the forest may be limiting. This causes the dung pads to be exposed to sunlight, higher temperature and wind action. These factors contribute to dung pad desiccation which decreases the period of suitable dung availability. Dung beetles of different groups may respond to changes in vegetation in different ways. [6]

A decline in dung beetle diversity associated with the conversion of native forests to open pastures is known to occur. However, some species are able to utilize dung in open pasture conditions. Tunneler species are able to utilize dung in less optimal condition because they tunnel beneath the dung and utilize it from bottom up. As desiccation occurs on the top of the dung pad, the middle and lower regions may still be suitable for the dung beetle. Also, smaller species are able to survive in such conditions as they require less dung. Larger beetles require larger amounts of dung which may not be available due to the fast desiccation of the dung pads in these conditions. Soil hardness and dryness negatively affect the tunnelers. Species able to tolerate open pasture conditions were extremely abundant. The reduction in the number of dung beetles affected the efficiency of their ecological roles and it was found that dung removal and burial declined. Dung removal and burial by dung beetles result in ecological benefits such as soil aeration and fertilization. These benefits lead to improved nutrient cycling and uptake by plants, increase in pasture quality, biological control of pest flies and intestinal parasites and secondary seed dispersal. Therefore, their role in the ecosystem is essential. [7]

Taxonomy

The subfamily is split into about 12 extant tribes. [2] [8] These can be grouped by their distribution, though the present classification is expected to require major revision based on recent phylogenetic analyses. [9]

Tribes with a global distribution

Predominantly Old World (New World presence likely represents rather recent dispersal)

Old World

New World

Related Research Articles

<span class="mw-page-title-main">Dung beetle</span> Informal group of insects

Dung beetles are beetles that feed on feces. Some species of dung beetles can bury dung 250 times their own mass in one night.

<i>Phanaeus vindex</i> Species of beetle

Phanaeus vindex, the rainbow scarab, is a North American species of true dung beetle in the family Scarabaeidae. It is found in eastern and central United States and in adjacent far northern Mexico. It is the most widespread species of Phanaeus in the United States and it has a wide habitat tolerance. It may hybridize with the generally less common P. difformis.

<i>Copris</i> Genus of dung beetles

Copris is a genus of dung beetles in the tribe Coprini of the scarab family. It comprises more than 250 tunnelling species and has an almost worldwide distribution.

<i>Deltochilum valgum</i> Species of beetle

Deltochilum valgum is a nocturnal, Neotropical species of dung beetle in the family Scarabaeidae, which has evolved a predatory lifestyle. While most other members of the true dung beetle subfamily feed on faeces or decomposing matter, D. valgum is highly specialised for eating millipedes; such a transition from scavenger to carnivore is rare. Whether this is novel adaption in this species or an ancestral adaption in the genus is unclear; at least two other species, Deltochilum kolbei and D. viridescens, which are not particularly closely related to D. valgum, also kill and feed on millipedes.

<span class="mw-page-title-main">Onthophagini</span> Tribe of beetles

Onthophagini are a tribe of scarab beetles. Commonly placed in the true dung beetle subfamily (Scarabaeinae), it belongs to a group of subfamilies separated as subfamily Coprinae in some treatments.

<i>Digitonthophagus</i> Genus of scarab beetles

Digitonthophagus is a genus of Scarabaeidae or scarab beetles in the superfamily Scarabaeoidea. It was considered a subgenus of Onthophagus by some authorities. A review of the taxon was published in 2017.

<i>Eurysternus</i> Genus of beetles

Eurysternus is a genus of Scarabaeinae or dung beetles in the family Scarabaeidae. It is normally placed in the Oniticellini, although some authors consider it the single genus in the tribe Eurysternini (e.g.). It is restricted to the Neotropics and includes 53 recognized species.

<i>Onthophagus</i> Genus of beetles

Onthophagus is a genus of dung beetles in the Onthophagini tribe of the wider scarab beetle family, Scarabaeidae. It is the most species-rich and widespread genus in the subfamily Scarabaeinae, with a global distribution.

<i>Digitonthophagus gazella</i> Species of beetle

Digitonthophagus gazella is a species of scarab beetle. It belongs to the genus Digitonthophagus, which was promoted from subgenus to genus level in 1959. There has been some confusion regarding the application of the names with many people using the outdated name Onthophagus gazella. Dung beetle experts use the term Digitonthophagus gazella.

<i>Phanaeus</i> (beetle) Genus of beetles

Phanaeus, the rainbow scarabs, is a genus of true dung beetles in the family Scarabaeidae, ranging from the United States to northern Argentina, with the highest species richness in Mexico. Depending on species, they can inhabit a wide range of habitats, from tropical to temperate climates and deserts to rainforests. In those living in relatively arid places adults are primarily active during the wet season and those living in relatively cold places are primarily active during the summer. They are excellent diggers and good fliers.

<span class="mw-page-title-main">Oniticellini</span> Tribe of beetles

Oniticellini are a tribe of scarab beetles, in the true dung beetle subfamily (Scarabaeinae). Nearly all species of this tribe feed on and nest in dung, mainly that of large herbivores. Most are tunnelers; dung is buried at the ends of tunnels dug below a dropping, and used as food by both adults and larvae; others, known as dwellers make brood cavities within or just beneath the dung.

<i>Proagoderus</i> Genus of beetles

Proagoderus is a genus of Scarabaeidae or scarab beetles in the subfamily Scarabaeinae. It was considered a subgenus of Onthophagus by some authorities. It includes over 100 species native to Africa and Asia.

<span class="mw-page-title-main">Coprini</span> Tribe of beetles

Coprini is a tribe of scarab beetles, in the dung beetle subfamily (Scarabaeinae). Scholtz et al. describe them as tunnellers that are shiny black, of moderate to large size and with a strongly convex shape. They also, however state that the grouping based on these characteristics has little phylogenetic validity, and the placement of several genera in this and related tribes is likely to change.

<i>Sarophorus</i> Genus of beetles

Sarophorus is a genus of dung beetles in the tribe Ateuchini of the family Scarabaeidae. It comprises about ten species from Africa.

<span class="mw-page-title-main">Phanaeini</span> Tribe of beetles

Phanaeini is a tribe of dung beetles in the family Scarabaeidae. There are about 12 genera and 200 described species in Phanaeini. They are native to the Americas with the highest species richness in the Neotropics. They are mostly coprophagous or necrophagous, but some of the least known genera appear to be myrmecophilous. They are medium-sized to large beetles, often with bright metallic colors, and often with horns on their heads.

<i>Copris fricator</i> Species of beetle

Copris fricator is a species of dung beetle in the family Scarabaeidae.

Onthophagus unifasciatus, is a species of true dung beetle native to India and Sri Lanka.

Copris repertus, is a species of dung beetle found in India, Sri Lanka and Myanmar.

<i>Onthophagus dama</i> Species of beetle

Onthophagus dama, is a species of dung beetle found in Nepal, Bhutan, India, and Sri Lanka.

Onthophagus hastifer, is a species of dung beetle found in India, Sri Lanka, Vietnam, Taiwan, Thailand, and Myanmar.

References

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  2. 1 2 Bouchard, P.; Bousquet, Y.; Davies, A.; Alonso-Zarazaga, M.; Lawrence, J.; Lyal, C.; Newton, A.; Reid, C.; Schmitt, M.; Ślipiński, A.; Smith, A. (2011). "Family-group names in Coleoptera (Insecta)". ZooKeys (88): 1–972. doi: 10.3897/zookeys.88.807 . PMC   3088472 . PMID   21594053.
  3. 1 2 Louzada, J; Lima, A; Matavelli, R; Zambaldi, L; Barlow, J (2010). "Community structure of dung beetles in Amazonian savannas: role of fire disturbance, vegetation and landscape structure". Landscape Ecology. 25 (4): 631–641. doi:10.1007/s10980-010-9448-3. S2CID   23269300.
  4. Braga, R; Korasaki, V; Andresen, E; Louzada, J (2013). "Dung Beetle Community and Functions along a Habitat-Disturbance Gradient in the Amazon: A Rapid Assessment of Ecological Functions Associated to Biodiversity". PLOS ONE. 8 (2): e57786. doi: 10.1371/journal.pone.0057786 . PMC   3583983 . PMID   23460906.
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