Haidoterminus is an extinctgenus of ant in the Formicidae subfamily Haidomyrmecinae, and is one of only nine genera placed in this subfamily. The genus contains a single described species Haidoterminus cippus and is known from one Late Cretaceous fossil which has been found in North America.
Haidoterminus is known from a solitary adult fossil, the holotype, specimen number "UASM 332546" donated for study by Mark Elaschuk. At the time of description, the specimen was residing in the Strickland Entomology Museum, part of the University of Alberta.[1] The holotype specimen is composed of a mostly complete worker caste adult female which has been preserved as an inclusion in a transparent chunk of clear yellow Canadian amber. The amber specimen was recovered from deposits of the Foremost Formation near Grassy Lake, Alberta, Canada. Canadian amber has been dated to an age of approximately 79–78 million years old, placing it in the Campanian of the Late Cretaceous. Analysis of the amber composition indicates it originated as cupressaceous resins which were deposited in lagoons and salt water marshes along the Western Interior Seaway.[1]Haidoterminus is one of five ant species described from the Grassy Lake site, the others being Sphecomyrma canadensis, Eotapinoma macalpini, Canapone dentata, and Cananeuretus occidentalis.[1]
The fossil was first studied by paleoentomologists Ryan C. McKellar and Michael S. Engel of the University of Kansas, and James R.N. Glasier of the University of Alberta. The team's 2013 type description of the new genus and species was published in the journal Canadian Entomology. The genus name Haidoterminus was coined by them as a combination of Haidomyrmex, the type genus for Haidomyrmecini, and the Latinterminus meaning "end or boundary" in allusion to the genus being the last member of the tribe Haidomyrmecini to live. The specific epithetcippus, from the Latin for "tombstone or pillar", references the clypeal pads' distinct columnar appearance. Haidoterminus is one of five genera in Haidomyrmecini, the other four being Ceratomyrmex, Linguamyrmex, Haidomyrmex, and Haidomyrmodes.[1][2]
Descriptionedit
The Haidoterminus holotype worker has a similar structure to species of Haidomyrmex. The mandibles are very large and well developed with a scythe-shaped appearance in side view and notably narrow bases. The holotype is overall approximately 3.2 millimetres (0.13 in) with small oval shaped compound eyes made up of a larger ommatidia in low numbers. The clypeus has a concave structure sporting several larger setae including two long trigger setae. The antennae are distinct in having a total of twelve segments, in contrast to the eleven segments seen in Haidomyrmex and Haidomyrmodes. Haidoterminus has an elongated third antennomere and a bulb shaped terminal flagellomere, while the antennae have an overall coating of short inclined setae.[1]
Referencesedit
^ abcdeMcKellar, R. C.; Glasier, J. R. N.; Engel, M. S. (2013). "A new trap-jawed ant (Hymenoptera: Formicidae: Haidomyrmecini) from Canadian Late Cretaceous amber" (PDF). Canadian Entomologist. 145 (4): 454–465. doi:10.4039/tce.2013.23. hdl:1808/14425. S2CID 53993056.
^Barden, P; Herhold, H. W.; Grimaldi, D. A. (2017). "A new genus of hell ants from the Cretaceous (Hymenoptera: Formicidae: Haidomyrmecini) with a novel head structure". Systematic Entomology. 42 (4): 837–846. Bibcode:2017SysEn..42..837B. doi:10.1111/syen.12253.
External linksedit
Media related to Haidoterminus cippus at Wikimedia Commons
April 12, 2024
haidoterminus, extinct, genus, formicidae, subfamily, haidomyrmecinae, only, nine, genera, placed, this, subfamily, genus, contains, single, described, species, cippus, known, from, late, cretaceous, fossil, which, been, found, north, america, temporal, range,. Haidoterminus is an extinct genus of ant in the Formicidae subfamily Haidomyrmecinae and is one of only nine genera placed in this subfamily The genus contains a single described species Haidoterminus cippus and is known from one Late Cretaceous fossil which has been found in North America HaidoterminusTemporal range Campanian PreꞒ Ꞓ O S D C P T J K Pg N Haidoterminus cippus holotypeScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ArthropodaClass InsectaOrder HymenopteraFamily FormicidaeSubfamily HaidomyrmecinaeGenus HaidoterminusMcKellar Glasier amp Engel 2013Species H cippusBinomial name Haidoterminus cippusMcKellar Glasier amp Engel 2013 Contents 1 History and classification 2 Description 3 References 4 External linksHistory and classification editHaidoterminus is known from a solitary adult fossil the holotype specimen number UASM 332546 donated for study by Mark Elaschuk At the time of description the specimen was residing in the Strickland Entomology Museum part of the University of Alberta 1 The holotype specimen is composed of a mostly complete worker caste adult female which has been preserved as an inclusion in a transparent chunk of clear yellow Canadian amber The amber specimen was recovered from deposits of the Foremost Formation near Grassy Lake Alberta Canada Canadian amber has been dated to an age of approximately 79 78 million years old placing it in the Campanian of the Late Cretaceous Analysis of the amber composition indicates it originated as cupressaceous resins which were deposited in lagoons and salt water marshes along the Western Interior Seaway 1 Haidoterminus is one of five ant species described from the Grassy Lake site the others being Sphecomyrma canadensis Eotapinoma macalpini Canapone dentata and Cananeuretus occidentalis 1 The fossil was first studied by paleoentomologists Ryan C McKellar and Michael S Engel of the University of Kansas and James R N Glasier of the University of Alberta The team s 2013 type description of the new genus and species was published in the journal Canadian Entomology The genus name Haidoterminus was coined by them as a combination of Haidomyrmex the type genus for Haidomyrmecini and the Latin terminus meaning end or boundary in allusion to the genus being the last member of the tribe Haidomyrmecini to live The specific epithet cippus from the Latin for tombstone or pillar references the clypeal pads distinct columnar appearance Haidoterminus is one of five genera in Haidomyrmecini the other four being Ceratomyrmex Linguamyrmex Haidomyrmex and Haidomyrmodes 1 2 Description editThe Haidoterminus holotype worker has a similar structure to species of Haidomyrmex The mandibles are very large and well developed with a scythe shaped appearance in side view and notably narrow bases The holotype is overall approximately 3 2 millimetres 0 13 in with small oval shaped compound eyes made up of a larger ommatidia in low numbers The clypeus has a concave structure sporting several larger setae including two long trigger setae The antennae are distinct in having a total of twelve segments in contrast to the eleven segments seen in Haidomyrmex and Haidomyrmodes Haidoterminus has an elongated third antennomere and a bulb shaped terminal flagellomere while the antennae have an overall coating of short inclined setae 1 References edit a b c d e McKellar R C Glasier J R N Engel M S 2013 A new trap jawed ant Hymenoptera Formicidae Haidomyrmecini from Canadian Late Cretaceous amber PDF Canadian Entomologist 145 4 454 465 doi 10 4039 tce 2013 23 hdl 1808 14425 S2CID 53993056 Barden P Herhold H W Grimaldi D A 2017 A new genus of hell ants from the Cretaceous Hymenoptera Formicidae Haidomyrmecini with a novel head structure Systematic Entomology 42 4 837 846 Bibcode 2017SysEn 42 837B doi 10 1111 syen 12253 External links edit nbsp Media related to Haidoterminus cippus at Wikimedia Commons Retrieved from https en wikipedia org w index php title Haidoterminus amp oldid 1209930917, wikipedia, wiki, book, books, library,