Biology:Senostoma

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Short description: Genus of flies

Senostoma
Long tongue tachinid fly edit.jpg
Scientific classification e
Domain: Eukaryota
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Diptera
Family: Tachinidae
Subfamily: Dexiinae
Tribe: Dexiini
Genus: Senostoma
Macquart, 1847[1]
Type species
Senostoma variegata
Macquart, 1847[1]
Synonyms
  • Austrodexia Malloch, 1930[2]
  • Lasiocalypter Malloch, 1930[2]
  • Lasiocalyptrina Malloch, 1930[2]
  • Macropodexia Townsend, 1933[3]
  • Rhychiodexia Bigot, 1889[4]
  • Rhychodexia Bigot, 1889[4]
  • Rhycodexia Malloch, 1930
  • Rhynchiodexia Bigot, 1885
  • Rhynchionodexia Bigot, 1885[5]
  • Rhynchodexia Wulp, 1891
  • Stenostoma Macquart, 1850[6]

Senostoma is a genus of parasitoid tachinid flies in the family Tachinidae.[7] Endemic to Australasia, the flies are medium-sized, bristly, and long-legged.

Taxonomy

French entomologist Pierre-Justin-Marie Macquart first described the genus in 1847 in the work "Diptères Exotiques, Nouveaux Ou Peu Connus, Supplément I", published in Memoires de la Societe royale des sciences, de l'agriculture et des arts, de Lille. Macquart stated that "Senostoma" signifies "narrow mouth".[8][9]

At various times the name has been used generically, and misapplied to Prodiaphania and Microrutilia. Senostoma is classified in the subfamily Dexiinae; some older texts use the synonym Proseninae.[10][11]

The genus comprises four species-groups, punctipenne, rubricarinaturn, longipes, and hirsutilunula.[12]

There are approximately 10,000 species described within Tachinidae, and the geographic range and diversity of the species and difficulties encountered in classification means the count is probably thousands more. The monophyletic features that support Tachinidae classification are subtle, and detailed information on most genera and species is sparse. Senostoma is one such genus that lacks extensive research, with most studies having focussed only on a few of its 29 identified species.[13][14][15]

Distribution and habitat

As a member of the subfamily Dexiinae, Senostoma flies are endemic to the Australasian region. More specifically, the flies inhabit the Australian mainland and Tasmania, with two species present in New Caledonia and none in New Zealand. In Australia, members of the genus are non-existent in Cape York Peninsula and the Northern Territory. Some species are particularly narrow in distribution; S. basale inhabits only the Gondwana Rainforests, while S. hirticauda and S. simulcercus are limited to Barrington Tops and Tamborine Mountain, respectively.[16][17]

Senostoma can be found in a variety of habitats in the Australian region, but most species appear to prefer dry eucalypt forest at elevations above 600 metres. Adults are attracted to flowers and feed on their nectar, contributing to pollination, with Leptospermum being favoured by some species. As well as resting on Eucalyptus tree trunks and the surrounding substrate at hill-topping sites, the flies are observable elsewhere feeding on flowers and resting on rocks and vegetation.[13][14][15][18][19]

Parasitism

As with all known Tachinidae, Senostoma are parasitoids. The larvae develop inside a host, as intercellular endoparasites, consuming and killing the host in the process. For Senostoma, these hosts are exclusively beetles, most usually Scarabaeidae in the larval stage. In some cases, the host may survive the attack.[10][13][14][15][18]

The eggs are laid containing mature first instars, the female having incubated the eggs within her reproductive system until ready to hatch, a mode of reproduction known as ovolarviparity, more generally known as ovoviviparity. Deposition usually occurs on the ground and the eggs may hatch within seconds or a few minutes of being laid, whereupon the larvae hunt for a host beetle by burrowing into the soil. Other tachinids lay eggs directly onto potential hosts or food plants and therefore enjoy a higher success rate of infection; the number of eggs produced by Senostoma females is consequently higher than for some other genera, numbering somewhere between 1000 and 3000.[13][14][15]

The labrum of the larval mouthparts is sharp and functions as a cutting device, with which they penetrate the integument of the selected host, possibly helped by enzymes in their saliva. Once established inside the hosts, the larvae feed on them, passing through second and third instars before pupation occurs. Larval development for tachinids may take between one and three weeks to complete, and the death of the host does not usually occur until the final stage, when the fly is ready to emerge for pupation. As such, Senostoma are considered koinobiont parasitoids, as they co-exist with a living, functional host during development and avoid feeding on vital organs or other critical tissues until it is necessary for their continued growth.[13][15]

Morphology

Adult members of the genus have bristly bodies and long, thin legs. Their size is generally in the range of 10 to 12 mm, making them medium-sized within the family, as measurements for tachinids span from 2 mm to 20 mm. Mouthparts are distinctively elongated and narrow. Limited information suggests that Senostoma colourings are usually at the nondescript end of tachinid fly variation, with at least a few species being light grey and brown.[13][15][18]

Along with other genera, Senostoma flies possess two morphological features that support their inclusion in the family Tachinidiae. As larvae in the first instar, the labrum is attached to the cephalopharyngeal sclerites (the skeleton of the larval anterior digestive system), and as adults, the postscutellum is well-developed.[13]

Behaviour

A few species, S. longipes, S. pallidihirturn, and S. tessellaturn, have been noted to exhibit behaviour strongly suggestive of hill-topping, with males maintaining downward-facing positions on trunks of Eucalyptus trees, at elevations above 900 metres. This behaviour is likely to be applicable to other species within the genus. Each species studied appeared to prefer certain times of day for hill-topping and selected their positions on tree trunks based on bark smoothness or roughness, degree of illumination by sunlight, and distance from the ground. Males are competitive for these positions and can be observed engaging with each other aggressively, approaching each other for face-offs, spiral flights, and simulated copulation. While males congregating at altitude were in abundance, females were infrequently spotted at hill-topping sites, and when present, did not exhibit any territorial behaviour and preferred locations near the substrate. Female absence may be due to females only visiting the congregation sites when ready to mate. Although the behaviour of males and females at elevation are considered to be for mating purposes, direct evidence of this is lacking and little is known of their courtship and mating rituals.[13][14][15][19]

Species

  • Senostoma apicalis (Curran, 1938)
  • Senostoma appendiculatum (Macquart, 1851)[20]
  • Senostoma atripes (Malloch, 1930)[2]
  • Senostoma basale (Curran, 1938)
  • Senostoma brevipalpe (Macquart, 1846)[21]
  • Senostoma flavipes Barraclough, 1991
  • Senostoma flavohirtum (Malloch, 1930)[2]
  • Senostoma hirsutilunula Barraclough, 1992[22]
  • Senostoma hirticauda (Malloch, 1930)[2]
  • Senostoma hyria (Walker, 1849)[23]
  • Senostoma longimentum Barraclough, 1992[22]
  • Senostoma longipes (Macquart, 1846)[21]
  • Senostoma mcalpinei Barraclough, 1992[22]
  • Senostoma nigropilosum Barraclough, 1992[22]
  • Senostoma nigrospiraculum Barraclough, 1992[22]
  • Senostoma notatum (Walker, 1853)[24]
  • Senostoma pallidihirtum (Malloch, 1930)[2]
  • Senostoma pectinatum Barraclough, 1992[22]
  • Senostoma punctipenne (Macquart, 1846)[21]
  • Senostoma rubricarinatum (Macquart, 1846)[21]
  • Senostoma setigerum (Malloch, 1930)[2]
  • Senostoma setiventre (Malloch, 1930)[2]
  • Senostoma simulcercus Barraclough, 1992[22]
  • Senostoma taylori (Curran, 1938)
  • Senostoma tenuipes (Bigot, 1885)[5]
  • Senostoma tessellatum (Macquart, 1851)[20]
  • Senostoma testaceicorne (Macquart, 1851)[20]
  • Senostoma unipunctum (Malloch, 1930)[2]
  • Senostoma variegata Macquart, 1847[1]

References

  1. ↑ 1.0 1.1 1.2 Macquart, P.J.M. (1847). Diptères exotiques nouveaux ou peu connus. 2.e supplement. Paris: Roret. pp. 104 pp, 6 pls. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Malloch, J.R. (1930). "Notes on Australian Diptera. XXIII". Proceedings of the Linnean Society of New South Wales 55: 92-135. https://www.biodiversitylibrary.org/page/35069713#page/184/mode/1up. Retrieved 7 March 2022. 
  3. ↑ Townsend, C. H. T. (1933). "New genera and species of Old World oestromuscoid flies". Journal of the New York Entomological Society 40: 439–479. 
  4. ↑ 4.0 4.1 Bigot, J. M. F. (1889). "Dipteres nouveaux ou peu connus. 34e partie, XLII: Diagnoses de nouvelles especes". Annales de la Société Entomologique de France 8 (6): 253–270. 
  5. ↑ 5.0 5.1 Bigot, J.M.F. (1885). "[Diagnoses de 11 genres de diptères exotiques nouveaux]". Bulletin Bimensuel de la Société Entomologique de France 1884 (24): 237. 
  6. ↑ Macquart, P.J.M. (1850). "Nouvelles observations sur les insectes diptères d'Europe de la tribu des tachinaires". Annales de la Société Entomologique de France 7 (2): 353-418, pls. 10-12. https://www.biodiversitylibrary.org/page/32507624#page/357/mode/1up. Retrieved 13 September 2023. 
  7. ↑ O’Hara, James E.; Henderson, Shannon J.; Wood, D. Monty (5 March 2020). "Preliminary Checklist of the Tachinidae (Diptera) of the World". http://www.nadsdiptera.org/Tach/WorldTachs/Checklist/Tachchlist_ver2.1.pdf. 
  8. ↑ "Senostoma". Nomenclator Zoologicus. 2005. http://www.ubio.org/NZ/detail.php?uid=182268&d=1. 
  9. ↑ Macquart, Pierre-Justin-Marie (1846) (in French). Histoire Naturelle: Diptères Exotiques, Nouveaux Ou Peu Connus, Supplément I. Paris: Roret. pp. 161–237. https://archive.org/details/diptresexotiqu12macqfo. Retrieved 2010-08-31. 
  10. ↑ 10.0 10.1 Cantrell, Bryan K. (1986). "An updated host catalogue for the Australian Tachinidae (Diptera)". Journal of the Australian Entomological Society 25 (3): 255–265. doi:10.1111/j.1440-6055.1986.tb01112.x. 
  11. ↑ Crosskey, Ryan W. (1971). "The Type-Material of Australasian, Oriental, and Ethiopian Tachinidae (Diptera) described by Macquart and Bigot". Bulletin of the British Museum (Natural History), Entomology (London: The Bulletin of the British Museum) 25 (6): 251–305. https://archive.org/stream/bulletinofbritis25entolond/bulletinofbritis25entolond_djvu.txt. Retrieved 2010-08-31. 
  12. ↑ Barraclough, David A (1992). "The systematics of the Australasian Dexiini (Diptera : Tachinidae: Dexiinae) with revisions of endemic genera". Invertebrate Taxonomy 6 (5): 1127–1371. doi:10.1071/IT9921127. 
  13. ↑ 13.0 13.1 13.2 13.3 13.4 13.5 13.6 13.7 O'Hara, James E; Usupensky, Igor; Bostanian, N. J.; Capinera, John L.; Chapman, Reg; Barfield, Carl S.; Swisher, Marilyn E.; Barfield, Carl S. et al. (2008). "Tachinid Flies (Diptera: Tachinidae)". Encyclopedia of Entomology (Dordrecht: Springer Netherlands) (2nd edition): 3675–3686. doi:10.1007/978-1-4020-6359-6_2344. ISBN 978-1-4020-6242-1. http://www.nadsdiptera.org/Tach/Gen/tachintr.htm. Retrieved 2010-08-30. 
  14. ↑ 14.0 14.1 14.2 14.3 14.4 Evenhuis, Neal L. (2007). "113. Family TACHINIDAE". Catalog of the Diptera of the Australasian and Oceanian Regions. http://hbs.bishopmuseum.org/aocat/tachinidae.html. Retrieved 2010-08-30. 
  15. ↑ 15.0 15.1 15.2 15.3 15.4 15.5 15.6 Stireman, John O. III; O'Hara, James E.; Wood, D. Monty (2006). "Tachinidae: Evolution, Behavior, and Ecology". Annual Review of Entomology (Annual Reviews) 51: 525–555. doi:10.1146/annurev.ento.51.110104.151133. PMID 16332222. http://www.wright.edu/~john.stireman/StiremanetalARE2006.pdf. Retrieved 2010-08-30. 
  16. ↑ O'Hara, James E. (December 2008). World genera of the Tachinidae (Diptera) and their regional occurrence. http://www.nadsdiptera.org/Tach/Genera/Gentach_ver4.pdf. Retrieved 2010-08-31. 
  17. ↑ Williams, Geoff (2002). "A Taxonomic and Biogeographic Review of the Invertebrates of the Central Eastern Rainforest Reserves of Australia (CERRA) World Heritage Area, and Adjacent Regions". Technical Reports of the Australian Museum 16: 1–208. doi:10.3853/j.1031-8062.16.2002.1353. ISSN 1031-8062. http://www.australianmuseum.net.au/Uploads/Journals/15402/1353_complete.pdf. Retrieved 2010-08-31. 
  18. ↑ 18.0 18.1 18.2 Zborowski, Paul; Storey, Ross (1996). A field guide to insects in Australia. Reed. p. 150. ISBN 978-0-7301-0414-8. 
  19. ↑ 19.0 19.1 Barraclough, David A. (August 1990). "Field observations of Senostoma spp. (Diptera:Tachinidae) at Katoomba, N.S.W". Australian Journal of Entomology 29 (3): 247–252. doi:10.1111/j.1440-6055.1990.tb00355.x. 
  20. ↑ 20.0 20.1 20.2 Macquart, P. J. M. (1851). "Dipteres exotiques nouveaux ou peu connus. Suite du 4e supplement publie dans les memoires de 1849". Mémoires de la Société (Royale) des sciences, de l'agriculture et des arts à Lille 1850: 134–294. https://www.biodiversitylibrary.org/item/107754#page/156/mode/1up. Retrieved 28 March 2021. 
  21. ↑ 21.0 21.1 21.2 21.3 Macquart, P.J.M. (1846). Diptères exotiques nouveaux ou peu connus. Supplement. [1]. Lille: Mem. Soc. R. Sci. Agric. Arts. pp. 133–364, 20 pls. https://www.biodiversitylibrary.org/item/109525#page/5/mode/1up. Retrieved 5 December 2020. 
  22. ↑ 22.0 22.1 22.2 22.3 22.4 22.5 22.6 Barraclough, D.A. (1992). "The systematics of the Australasian Dexiini (Diptera : Tachinidae : Dexiinae) with revisions of endemic genera". Invertebrate Taxonomy 6 (5): 1127–1371. doi:10.1071/IT9921127. 
  23. ↑ Walker, F. (1849). List of the specimens of dipterous insects in the collection of the British Museum. Part IV.. London: British Museum. pp. [3] + 689-1172 + [2]. https://www.biodiversitylibrary.org/item/118982#page/7/mode/1up. Retrieved 20 October 2022. 
  24. ↑ Walker, Frances (1853). Diptera. Part IV, pp. 253-474, pls. 7-8. In [Saunders, W. W. (ed.)], Insecta Saundersiana: or characters of undescribed insects in the collection of William Wilson Sauders, Esq., F.R.S., F.L.S., &c. Vol. 1. London: Van Voorst. pp. 1–474. 

Wikidata ☰ Q4027739 entry



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