Gehennachelys maini (Adrian, Smith, Noto, and Grossman, 2023) Adrian & Smith & Noto, 2023

Adrian, Brent, Smith, Heather F. & Noto, Christopher R., 2023, A revision of “ Trinitichelys ” maini (Testudinata: Baenidae) and additional material of its new genus from the Lewisville Formation (Woodbine Group, Cenomanian), Texas, USA, Palaeontologia Electronica (a 28) 26 (2), pp. 1-43 : 7

publication ID

https://doi.org/ 10.26879/1266

publication LSID

lsid:zoobank.org:pub:06BB716C-7E07-435E-B18D-14B9A965A588

persistent identifier

https://treatment.plazi.org/id/D25AE866-FFE2-F125-1AED-FEBE59777DAE

treatment provided by

Felipe

scientific name

Gehennachelys maini
status

comb. nov.

Gehennachelys maini comb. nov. (Adrian et al., 2019)

Figures 2-7 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7

v. 2012 Noto, Main, and Drumheller, figures 2, 4A

v. 2015 Noto, figure 10A, C, E

v. 2019 Adrian, Smith, Noto, and Grossman, figures 2-3

Holotype. DMNH 2013-07 About DMNH - 0712 About DMNH , an anterior plastral lobe (Adrian et al. 2019, figure 3.1-4).

Type strata and locality. Upper Cretaceous (early middle Cenomanian) Lewisville Formation, Woodbine Group (Denne et al., 2016). The Arlington Archosaur Site, city of Arlington, Tarrant County, Texas . Exact locality data are on file at the Perot Museum of Nature and Science, Dallas, Texas .

Referred material. See hypodigm of Adrian et al. (2019), and additionally: DMNH 2013-07-1942, a nearly complete shell and cranium with associated postcrania; HMNS- 10-TM, a complete shell; DMNH 2013-07-0784, a partial carapace with well preserved sulci; DMNH 2013-07-1431, right coracoid; DMNH 2013-07-0601, right scapula; DMNH 2013-07-1924, second cervical vertebra; DMNH 2013-07-1369, partial right scapula; DMNH 2013- 07-0681, partial left scapula and associated bone fragments; DMNH 2013-07-0533, partial left scapula; DMNH 2013-07-2005, partial right scapula.

Distribution. Cenomanian of north central Texas.

Revised diagnosis. The newly combined taxon is diagnosed by the following unique combination of characters, rather than particular autapomorphies: deep upper temporal emargination exposing the anterior margin of the otic chamber in dorsal view; absent parietal-squamosal contact; elongated squamosal processes; prominent crista supraoccipitalis that is not covered anteriorly by the parietals; shell co-ossified in adults, with robust bridge peripherals and absent fenestrae; gular and extragular scales paired and similarly sized, with midline extragular contact; curved gular-extragular sulci; single, undivided cervical scale that is wider than long; straight femoral-anal sulcus; a complete ring of 12 marginal scales that separate the posteriormost vertebral scale from the carapace margin; scalloped posterior carapace margin; anterior and posterior plastral lobes that are approximately equidimensional.

DMNH

Delaware Museum of Natural History

Kingdom

Animalia

Phylum

Chordata

Family

Baenidae

Genus

Gehennachelys

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