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Genus Macrosiagon
Classification Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Cucujiformia)
Superfamily Tenebrionoidea
Family Ripiphoridae (Wedge-shaped Beetles)
Subfamily Ripiphorinae
Genus Macrosiagon
Pronunciation mac-row-see-AH-gon Explanation of Names Greek 'large jaw' --refers to the enlarged mouthparts:
The grammatical gender is feminine, thus the -a endings of the specific epithets. (Zack Falin, pers. comm. to =v=, 21.xii.2009)
Numbers the largest genus in the family, with 11 spp. in our area and ~160 worldwide (1); 7 spp. in NC & SC (2)(3), 8 in FL (4), 2 reach Canada (5)
not yet in guide: M. bifoveata (Horn) - IL, TX; M. fernalda Rivnay - CA Identification Elytra cover most of abdomen. Thorax has projection covering scutellum. Usually colored black and orange. In females, abdomen blunt, antennae mostly serrate; in males, abdomen more pointed, antennae pectinate. Color varies greatly within species.
keys and descriptions in (6)(7)(8)Range Worldwide; in NA, much of the US + ON & SK (1)(5)Habitat adults usually on flowers, esp. Asteraceae (1)Food Larvae are parasitoids of wasps and bees (Vespidae, Sphecidae, Crabronidae, Pompilidae, Apidae, etc.) +Host associations: M. cruenta, twig-nesting Eumeninae; M. flavipennis, Bembix; Scoliidae, Tiphiidae (9); hosts in Cuba, IndonesiaLife Cycle eggs laid on flowers and hatch into an active larva (triungulin) that attaches itself to visiting wasp/bee and is carried to the nest where it burrows into a host larva Remarks our only representative of the tribe Macrosiagonini Heyden 1908 (1)Works Cited | 1. | American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL. |  |
| 2. | Insects of North Carolina
C.S. Brimley. 1938. North Carolina Department of Agriculture. | |
| 3. | Tenebrionoidea of South Carolina
Janet C. Ciegler. 2014. Clemson University. | |
| 5. | Checklist of beetles (Coleoptera) of Canada and Alaska. Second edition
Bousquet Y., Bouchard P., Davies A.E., Sikes D.S. 2013. ZooKeys 360: 1–402. | |
| 8. | The Rhipiphoridae of California (Coleptera)
Linsley E.G., MacSwain J.W. 1951. Bull. Calif. Insect Surv. 1: 79-88. | |
| 9. | The Wasps
Howard Ensign Evans, Mary Jane West Eberhard. 1970. University of Michigan Press. | |
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