What percentage of Mammalia are Placentalia? Around 95%
What percentage of Placentalia is Boreoeutheria?
According to the official Mammal Diversity Database (which is maintained by the American Society of Mammalogists and is up to date as of this January), there are 6611 currently living mammal species, of which 6207 are in Placentalia, and of these 6079 are part of Boreoeutheria
Ok so what is the clade(s) that are included in placentalia but excluded from boreoeutheria?
placental mammals have 2 subgroups, each with their own 2 subgroups
Class MAMMALIA Infraclass PLACENTALIA (Placental mammals):
---ATLANTOGENATA
Afrotheria,
Xenarthra
---BOREOEUTHERIA
Euarchotaglires,
Laurasiatheria
So all the Mammal species are Boreoeutheria except 532
Yes (128 Atlantogenata, 399 marsupials, 5 monotremes)
I haven't tallied up Boreoeutheria yet but according to what I calculated Atlantogenata has 118 species (30 in Xenarthra and 88 in Afrotheria), not 128. But adding that to the other numbers adds up so somewhere it's off by 10 unless Atlantogenata magically grew 10 species.
MAGNORDER ATLANTOGENATA (118 (128?) species, 8 orders):
--Afrotheria (6 orders)
--Xenarthra (2 orders)
---Superorder XENARTHRA (2 orders)(14gn,30sp)
----------------Order Cingulata (20sp,9gn)
----------------Order Pilosa (10sp,5gn)
---Superorder AFROTHERIA (6 orders)(33gn,88sp)
-------Grandorder Afroinsectiphilia (3ord,26gn,76sp)
-----------------Order Tubulidentata (1sp,1gn)
-----------------Order Macroscelidea (20sp,5gn)
-----------------Order Afrosoricida (55sp,20gn)
------Grandorder Paenungulata (3ord,7gn,12sp)
----------------Order Hyracoidea (5sp,3gn)
----------------Order Proboscidea (3sp,2gn)
----------------Order Sirenia (4sp,2gn)
The exact number of species may vary somewhat by source, but again based on the MDD which I linked above, the numbers are as follows:
- Cingulata 22
- Pilosa 17
- Hyracoidea 6
- Sirenia 4
- Proboscidea 3
- Tubulidentata 1
- Macroscelidea 20
- Afrosoricida 55
So it seems like this database has several more xenarthrans and an extra hyrax in comparison to wherever those numbers are from. I'm not a mammal expert and so can't comment on which particular species may be the ones in question, but it's possible that there are some species with contested or limited recognition.
Interesting. Yeah, the database really doesn't tell me anything about species on my phone, the site looks all disjointed, I'll have to check it out on a real computer.
Cool, thanks.
Interested in knowing what percentage of placentals have a scrotum? I’d say about 95% of all placentals have a scrotum. Elephants, manatees, armadillos, sloths, etc. I think don’t have a scrotum.
Well, I mean the entire clade Boreoeutheria as opposed to Atlantogenata 😂 obviously females do not have a scrotum.
So essentially the question is also "what percentage of Placentalia is Atlantogenata?"
What I was actually thinking about is that when most people are asked to name an animal most the time they not only name mammals, and not only placental mammals, but boreoeutherians. My thinking was more about what do regular people usually think of when they think about an animal.
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