Auricular semets in Alces and Odocoileus, but not other odocoileine deer

In https://www.inaturalist.org/journal/milewski/55532-previously-overlooked-facial-expressions-in-the-wapiti#, I showed that a typical species of cervine deer possesses auricular semets, particularly in juveniles and adult females in summer coat.

This finding is all the more intriguing because, in other respects, the sexes hardly differ in colouration in the wapiti (Cervus canadensis).

Since we now have a search-image for these small-scale but significant patterns, the question arises: how do the two main clades of deer differ in the incidence of auricular semets?

The two main subfamilies are Cervinae and Odocoileinae, the former associated mainly with Eurasia and the latter associated mainly with the Americas (https://en.wikipedia.org/wiki/Capreolinae). The geographical split is blurred by

the occurrence of Capreolus in Eurasia, and
the sharing of Alces, Rangifer and C. canadensis between Eurasia and North America.

What I show in this Post is that odocoileine deer in general lack auricular semets, the main exceptions being

the moose (Alces alces, e.g. https://www.gettyimages.com.au/detail/photo/something-in-my-teeth-royalty-free-image/973911964?adppopup=true), and
certain subspecies of mule deer (e.g. Odocoileus hemionus columbianus, https://www.canstockphoto.com/black-tailed-deer-portrait-2-10107138.html).

In the moose, the pattern differs from that in e.g. the wapiti. This is because it is

restricted to the anterior base of the ear pinna,
present in adult males as well as females, and
absent from infants.

Please see the following photos, bearing in mind that an auricular semet is a dark-edged, pale mark near the anterior and/or posterior base of the ear pinna, which seems to accentuate the movements of the ear (e.g. Cervus https://www.shutterstock.com/nb/image-photo/noble-deer-on-reindeer-farm-young-1867754611) for the purposes of social communication.

All these photos show females, excluding winter pelage.

In Odocoileus, auricular semets are faintly present in at least some individuals/species/subspecies. This includes the posterior position.

Odocoileus virginianus:
https://www.123rf.com/photo_10727638_close-up-image-of-a-white-tailed-deer-looking-directly-at-the-viewer-.html?vti=me7lbltklur83dgwan-1-28 and https://www.agefotostock.com/age/en/details-photo/white-tailed-deer-odocoileus-virginianus-ears-facing-to-rear/AAM-AAES75032 and https://www.alamy.com/closeup-portrait-of-a-whitetail-deer-face-looking-directly-at-the-camera-image240876206.html and https://www.deviantart.com/chuckrondeau/art/sweet-doe-face-215130437 and https://www.istockphoto.com/photo/feeding-whitetail-gm604347212-103768165 and https://www.istockphoto.com/photo/whitetail-deer-portrait-gm599957346-103073445 and https://www.istockphoto.com/photo/close-up-head-shot-of-doe-deer-gm1181687771-331531385 and https://www.canstockphoto.com/doe-profile-4843035.html

posterior position in O. virginianus:
https://www.alamy.com/rear-view-of-whitetail-deer-image276544713.html and http://www.huntingseasonready.com/whitetail-deer-hunting-tips/ and https://www.waaytv.com/content/news/New-law-allows-hunters-to-use-bait-to-hunt-white-tailed-deer-feral-pigs-509882281.html and https://www.dreamstime.com/deer-white-tailed-deer-animal-photo-deer-white-tailed-deer-animal-close-up-profile-view-deer-white-tailed-deer-animal-close-up-image165589990

Odocoileus hemionus hemionus:
https://www.istockphoto.com/photo/sweet-doe-eyes-gm94977058-3425761 and https://www.agefotostock.com/age/en/details-photo/odocoileus-hemionus-mule-deer-doe-female-alberta-canada-rocky-mountains/ACX-acp98340 and https://www.bigstockphoto.com/image-352098998/stock-photo-a-deer-in-the-grass%2C-licking-its-nose-with-a-long-pink-tongue%2C-big-brown-eyes%2C-shades-of-brown-fur%2C

posterior position in O. h. hemionus:
https://www.shutterstock.com/nb/video/clip-19415659-mule-deer-female-doe-adult-lone-eating

Odocoileus hemionus sitkensis:
https://www.projectnoah.org/spottings/9926088/fullscreen and https://www.flickr.com/photos/131551548@N03/22634897871/

Odocoileus hemionus californicus:
https://www.istockphoto.com/photo/mule-deer-gm811401016-131285265

posterior position in O. h. californicus:
https://www.istockphoto.com/photo/back-view-of-young-black-tailed-deer-head-yosemite-national-park-california-gm1164430579-320072937 and https://www.istockphoto.com/photo/black-tailed-deer-gm1069758032-286169994

Odocoileus hemionus columbianus:
https://www.istockphoto.com/photo/blacktail-doe-looking-at-the-camera-gm155141114-18380026 and https://www.istockphoto.com/photo/black-tailed-deer-pooping-gm1272898131-375034523

posterior position in O. h. columbianus:
https://www.canstockphoto.com/black-tailed-deer-on-wa-coast-1-20725189.html

However, auricular semets are absent in Rangifer, Capreolus, Blastocerus (except for a faint version in the posterior position), Ozotoceros, Hippocamelus, Pudu, and Mazama, as follows.

Rangifer tarandus:
https://www.alamy.com/stock-image-reindeer-pulling-a-funny-face-for-the-camera-163447232.html

Capreolus capreolus:
https://keyassets.timeincuk.net/inspirewp/live/wp-content/uploads/sites/6/2014/08/roe-deer.jpg and https://www.canstockphoto.com/close-up-of-a-roe-deer-fawn-15676304.html and https://www.masterfile.com/image/en/700-08916178/closeup-portrait-of-head-of-roe-deer-capreolus-capreolus-feeding and https://www.imageselect.eu/fr/stock-photo/Roe-deer.html and https://www.imageselect.eu/fr/stock-photo/even_17.html and https://www.dreamstime.com/stock-photo-young-european-roe-deer-capreolus-capreolus-sitting-grass-image45016998

Blastocerus dichotomus:
https://www.robertharding.com/preview/483-1805/rare-pampas-deer-grazing-swamp-ibera-national-park/ and https://www.robertharding.com/preview/1112-3594/adult-female-marsh-deer-blastocerus-dichotomus-pousado-alegre/ and https://www.shutterstock.com/nb/video/clip-1070660170-slow-motion-marsh-deer-chewing-grass-while (which, incidentally, nicely shows the buccal semet in this species) and https://www.shutterstock.com/nb/video/clip-1070793064-close-shot-marsh-deer-falling-asleep-while

posterior position in B. dichotomus:
https://www.dreamstime.com/female-marsh-deer-blastocerus-dichotomus-watching-aside-ae-image106237251

Ozotoceros bezoarticus:
see photos in http://www.proyectoibera.org/download/venado/informe_proyecto_venados_corrientes_2013.pdf

Hippocamelus bisulcus:
https://www.flickr.com/photos/frosselot/4439232371 and https://news.mongabay.com/2020/02/unsung-species-one-of-earths-rarest-land-mammals-clings-to-a-hopeful-future-commentary/ and https://www.youtube.com/watch?v=kvqnIAw63XQ and see photos in https://static1.squarespace.com/static/595ca91bebbd1a1d0aaab285/t/5a53fdf3ec212d2daa1934ee/1515453978197/Wildlife_Bulletin_01.pdf

Pudu puda:
https://kidadl.com/animal-facts/pudu-facts and https://kmstravel.cl/2016/06/15/have-you-ever-heard-about-pudus-this-lovely-animals-are-in-chile/

Mazama nana:
https://www.dreamstime.com/brazilian-dwarf-brocket-deer-mazama-nana-also-known-as-pygmy-brocket-brazilian-dwarf-brocket-deer-mazama-nana-also-known-as-pygmy-image106237029

Mazama gouazoubira:
http://animal.memozee.com/ArchOLD-7/1195371911.jpg

Finally, the following again show that an auricular semet occurs in adult females of Alces alces