Harpalinae
Harpalus pensylvanicus, a member of the Harpalinae subfamily.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Carabidae
Subfamily: Harpalinae
Linnaeus, 1758

Harpalinae is the largest subfamily of ground beetles, containing more than 19,000 species worldwide.[1]

Chlaenius purpuricollis, a member of Harpalinae in the tribe Chlaeniini.
Panagaeus fasciatus, a Harpalinae species within the tribe Pangaeini.
Pterostichus pedemontanus, another member within Harpalinae, in the tribe Pterostichini.

Biology

This subfamily contains the most apomorphic ground beetles, displaying a wide range of forms and behaviors.[2] The morphology of species within Harpalinae range from ant-mimics to charismatic members within the genus Pterostichus. Some exhibit rare feeding habits among ground beetles, including both omnivorous and even herbivorous species. Some members of Harpalinae, especially those restricted to the tropics, are considered to be arboreal.[3] This variety of habitats has been considered to lead to the wide diversification of morphological traits.

Systematics

Recent phylogenetic analysis of Harpalinae has placed approximately 19,000 species within around 40 tribes in this subfamily[1] with nearby sister subfamily clades having species numbers in the hundreds or lower.[4] Few subfamilies within Carabidae have been recovered as supported.[5] The monophyly of Harpalinae has been established with respect to ribosomal DNA and the wingless gene.[2] Further evidence to support this monophyly includes the similarities across the subfamily of their defensive secretions.[1] Further phylogenetic analyses have recovered Brachininae and Trechinae as a clade with Harpalinae.[5] As mentioned above, members in Harpalinae evolved to be arboreal. The evolution of these members involved multiple gains and losses of characters, with the evolution of arboreality originating and reversing several times.[3] With a variety of behaviors and habitats, Harpalinae species are predicted to have had a diversification rate greater than that of the angiosperms.[4]

Fossil Record

Fossil records and evolutionary history show that tribes within Harpalinae likely arose and diversified during the mid-Cretaceous period. A first fossil of a member of Harpalinae was dated to be from the late-Cretaceous period, and extant species of Harpalinae were found in Baltic amber.[1][6]

Ecology

Members of Harpalinae fulfill a variety of ecological niches. These include various symbioses with other insects, ovoviviparity, and even ectoparasitism.[6] Harpaline beetles, like other ground beetles, have pygidial glands that are used for defensive secretions, some secretions containing formic acid.[7] Members of Harpalinae are even considered agents of biological pest control, especially in agricultural settings.[8][9] While likely not having co-evolved with the angiosperms, angiosperm radiation likely lead to the diversification of ecological niches in Harpalinae.[4]

Tribes

The subfamily Harpalinae contains around 40 tribes, consisting of 19,000 species worldwide.[1] The variety of morphologies within Harpalinae make phylogenetic placements of tribes harder to establish without the support of genetic evidence.[2] Molecular phylogenies may even point to such a rapid speciation of Harpalinae, showing some of these tribes arising at the same time.[6] Supertribes have been constructed based on traits such as chemical defense structures, male and female reproductive structures, elytra morphology, and habitats. While these relationships are not entirely resolved, listed below are tribes currently pertaining to Harpalinae.

Colliuris pensylvanica, a weird-looking member of Harpalinae within the tribe Odacanthini.
Harpalus affinis
Chlaenius sp., larva

References

Wikimedia Commons has media related to Harpalinae.
Wikispecies has information related to Harpalinae.
  1. 1 2 3 4 5 Ober, Karen A.; Maddison, David R. (2008-10-23). "Phylogenetic Relationships of Tribes Within Harpalinae (Coleoptera: Carabidae) as Inferred from 28S Ribosomal DNA and the Wingless Gene". Journal of Insect Science. 8 (63): 63. doi:10.1673/031.008.6301. ISSN 1536-2442. PMC 3127421. PMID 20302528.
  2. 1 2 3 Ober, Karen A (2002-07-22). "Phylogenetic relationships of the carabid subfamily Harpalinae (Coleoptera) based on molecular sequence data". Molecular Phylogenetics and Evolution. 24 (2): 228–248. doi:10.1016/s1055-7903(02)00251-8. ISSN 1055-7903 – via Elsevier Science Direct.
  3. 1 2 Ober, Karen (2003-06-01). "Arboreality and morphological evolution in ground beetles (Carabidae: Harpalinae): Testing the taxon pulse model". Evolution. 57 (6): 1343–1358. doi:10.1111/j.0014-3820.2003.tb00342.x. PMID 12894942. Retrieved 2023-10-24.
  4. 1 2 3 Ober, Karen A. (2011). "Rapid Diversification and Evolution in Ground Beetles". American Entomologist. 57 (1): 46–48. doi:10.1093/ae/57.1.46. ISSN 2155-9902 – via Oxford Academic.
  5. 1 2 Li, Zhenya; Li, Xinxin; Song, Nan; Tang, Huiji; Yin, Xinming (2020-02-09). "The Mitochondrial Genome of Amara aulica (Coleoptera, Carabidae, Harpalinae) and Insights into the Phylogeny of Ground Beetles". Genes. 11 (2): 181. doi:10.3390/genes11020181. ISSN 2073-4425. PMC 7074353. PMID 32050506.
  6. 1 2 3 Ober, Karen A.; Heider, Thomas N. (2010-08-27). "Phylogenetic diversification patterns and divergence times in ground beetles (Coleoptera: Carabidae: Harpalinae)". BMC Evolutionary Biology. 10 (1): 262. Bibcode:2010BMCEE..10..262O. doi:10.1186/1471-2148-10-262. ISSN 1471-2148. PMC 2939577. PMID 20799952.
  7. ↑ Kanehisa, Katsuo; Murase, Masanori (1977-09-25). "Comparative Study of the Pygidial Defensive Systems of Carabid Beetles". Applied Entomology and Zoology. 12 (3): 225–235. Bibcode:1977AppEZ..12..225K. doi:10.1303/aez.12.225 – via J-Stage.
  8. ↑ Douglas, Margaret R.; Rohr, Jason R.; Tooker, John F. (2014-12-04). Kaplan, Ian (ed.). "EDITOR'S CHOICE: Neonicotinoid insecticide travels through a soil food chain, disrupting biological control of non‐target pests and decreasing soya bean yield". Journal of Applied Ecology. 52 (1): 250–260. doi:10.1111/1365-2664.12372. ISSN 0021-8901 – via British Ecological Society.
  9. ↑ C.F.G., Thomas; Parkinson, L.; Griffiths, G.J.K.; Garcia, A. Fernandez; Marshall, E.J.P. (2001-12-21). "Aggregation and temporal stability of carabid beetle distributions in field and hedgerow habitats". Journal of Applied Ecology. 38 (1): 100–116. Bibcode:2001JApEc..38..100C. doi:10.1046/j.1365-2664.2001.00574.x. ISSN 0021-8901 – via British Ecological Society.
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