Material now referred to Stegotretus was first described (in brief) by Eberth & Berman (1983).[2] It was formally named by Berman et al. (1988).[1] The genus name comes from the Greek stegos ('roof') and tretos ('perforated') to refer to a large fenestra found on the palatine bone. The species name, S. agyrus, is said to be derived from Greek agyrus ('gathering' / 'crowd') in reference to the concentration of all known specimens in a small area.[1] The proper word in ancient Greek for 'gathering' / 'crowd' is however agora (ἀγορά), with the variant agyris (ἄγυρις) in the Aeolic dialect.[3] The holotype and referred materials are currently reposited in the Carnegie Museum of Natural History. A large number of partial to complete skulls and associated postcrania are known for this taxon.
Anatomyedit
Despite the large number of specimens of Stegotretus, many are poorly preserved or distorted. Stegotretus is diagnosed by the presence of only two premaxillary teeth and by a large circular fenestra on the palatine. A contact between the maxilla and the quadratojugal and the absence of an entepicondylar foramen on the humerus separate it from the purportedly closely related Pantylus.
Relationshipsedit
Stegotretus was classified as a pantylid by Berman et al. (1988). This has been validated by phylogenetic analyses that include the taxon,[4][5][6] although it is sometimes recovered as being more closely related to Sparodus than to Pantylus when all three taxa are sampled.[7] Below is the result of the analysis by Huttenlocker et al. (2013):
^ abcBerman, D.S.; Eberth, D.A.; Brinkman, D.B. (1988). "Stegotretus agyrus, a new genus and species of microsaur (amphibian) from the Permo-Pennsylvanian of New Mexico". Annals of Carnegie Museum. 57: 293–323.
^Eberth, David A.; Berman, David S (1983). "Sedimentology and paleontology of Lower Permian fluvial redbeds of north-central New Mexico - preliminary report" (PDF). New Mexico Geology. 5: 21–25.
^Liddell, H.G. & Scott, R. (1940). A Greek-English Lexicon. Revised and augmented throughout by Sir Henry Stuart Jones with the assistance of Roderick McKenzie.Oxford: Clarendon Press.
^Huttenlocker, Adam K.; Pardo, Jason D.; Small, Bryan J.; Anderson, Jason S. (2013). "Cranial morphology of recumbirostrans (Lepospondyli) from the Permian of Kansas and Nebraska, and early morphological evolution inferred by micro-computed tomography". Journal of Vertebrate Paleontology. 33 (3): 540–552. doi:10.1080/02724634.2013.728998. ISSN 0272-4634.
^Anderson, Jason S. (2001-03-01). "The Phylogenetic Trunk: Maximal Inclusion of Taxa with Missing Data in an Analysis of the Lepospondyli (Vertebrata, Tetrapoda)". Systematic Biology. 50 (2): 170–193. doi:10.1080/10635150151125833. ISSN 1076-836X.
^Marjanović, David; Laurin, Michel (2019-01-04). "Phylogeny of Paleozoic limbed vertebrates reassessed through revision and expansion of the largest published relevant data matrix". PeerJ. 6: e5565. doi:10.7717/peerj.5565. ISSN 2167-8359. PMC6322490. PMID 30631641.
^Ruta, Marcello; Jeffery, Jonathan E.; Coates, Michael I. (2003-12-07). "A supertree of early tetrapods". Proceedings of the Royal Society of London. Series B: Biological Sciences. 270 (1532): 2507–2516. doi:10.1098/rspb.2003.2524. ISSN 1471-2954. PMC1691537. PMID 14667343.
stegotretus, extinct, genus, microsaur, referred, pantylidae, known, from, carboniferous, permian, boundary, cutler, formation, exposures, mexico, temporal, range, late, carboniferous, early, permianscientific, classificationdomain, eukaryotakingdom, animaliap. Stegotretus is an extinct genus of microsaur referred to the Pantylidae It is known from the Carboniferous Permian boundary Cutler Formation exposures of New Mexico 1 StegotretusTemporal range Late Carboniferous or Early PermianScientific classificationDomain EukaryotaKingdom AnimaliaPhylum ChordataOrder MicrosauriaClade RecumbirostraFamily GymnarthridaeGenus StegotretusBerman Eberth amp Brinkman 1988Type species Stegotretus agyrusBerman Eberth amp Brinkman 1988 Contents 1 History of study 2 Anatomy 3 Relationships 4 ReferencesHistory of study editMaterial now referred to Stegotretus was first described in brief by Eberth amp Berman 1983 2 It was formally named by Berman et al 1988 1 The genus name comes from the Greek stegos roof and tretos perforated to refer to a large fenestra found on the palatine bone The species name S agyrus is said to be derived from Greek agyrus gathering crowd in reference to the concentration of all known specimens in a small area 1 The proper word in ancient Greek for gathering crowd is however agora ἀgora with the variant agyris ἄgyris in the Aeolic dialect 3 The holotype and referred materials are currently reposited in the Carnegie Museum of Natural History A large number of partial to complete skulls and associated postcrania are known for this taxon Anatomy editDespite the large number of specimens of Stegotretus many are poorly preserved or distorted Stegotretus is diagnosed by the presence of only two premaxillary teeth and by a large circular fenestra on the palatine A contact between the maxilla and the quadratojugal and the absence of an entepicondylar foramen on the humerus separate it from the purportedly closely related Pantylus Relationships editStegotretus was classified as a pantylid by Berman et al 1988 This has been validated by phylogenetic analyses that include the taxon 4 5 6 although it is sometimes recovered as being more closely related to Sparodus than to Pantylus when all three taxa are sampled 7 Below is the result of the analysis by Huttenlocker et al 2013 Microsauria MicrobrachisAsaphesteraTuditanusHapsidopareionSaxonerpetonRecumbirostra PantylusStegotretusCarrollaBatropetesRhynchonkosEocaeciliaNannaroterPelodosotisMicraroterProxilodon bonneriTambaroterHuskerpeton englehorniPariotichusEuryodus dalyaeEuryodus primusCardiocephalus sternbergiCardiocephalus peabodyiReferences edit a b c Berman D S Eberth D A Brinkman D B 1988 Stegotretus agyrus a new genus and species of microsaur amphibian from the Permo Pennsylvanian of New Mexico Annals of Carnegie Museum 57 293 323 Eberth David A Berman David S 1983 Sedimentology and paleontology of Lower Permian fluvial redbeds of north central New Mexico preliminary report PDF New Mexico Geology 5 21 25 Liddell H G amp Scott R 1940 A Greek English Lexicon Revised and augmented throughout by Sir Henry Stuart Jones with the assistance of Roderick McKenzie Oxford Clarendon Press Huttenlocker Adam K Pardo Jason D Small Bryan J Anderson Jason S 2013 Cranial morphology of recumbirostrans Lepospondyli from the Permian of Kansas and Nebraska and early morphological evolution inferred by micro computed tomography Journal of Vertebrate Paleontology 33 3 540 552 doi 10 1080 02724634 2013 728998 ISSN 0272 4634 Anderson Jason S 2001 03 01 The Phylogenetic Trunk Maximal Inclusion of Taxa with Missing Data in an Analysis of the Lepospondyli Vertebrata Tetrapoda Systematic Biology 50 2 170 193 doi 10 1080 10635150151125833 ISSN 1076 836X Marjanovic David Laurin Michel 2019 01 04 Phylogeny of Paleozoic limbed vertebrates reassessed through revision and expansion of the largest published relevant data matrix PeerJ 6 e5565 doi 10 7717 peerj 5565 ISSN 2167 8359 PMC 6322490 PMID 30631641 Ruta Marcello Jeffery Jonathan E Coates Michael I 2003 12 07 A supertree of early tetrapods Proceedings of the Royal Society of London Series B Biological Sciences 270 1532 2507 2516 doi 10 1098 rspb 2003 2524 ISSN 1471 2954 PMC 1691537 PMID 14667343 nbsp Paleontology portal Retrieved from https en wikipedia org w index php title Stegotretus amp oldid 1213358503, wikipedia, wiki, book, books, library,
