Re: SC Fat

It seem to me that sc fat and sweating go together with standing in
water up to their noses a long time then getting out to hot weather
as it would be in the dried out mediterranean about 6 to 7 Ma.

Something like this is often thought by AATers, but let's look at it in
detail.

SC fat: Older orangs in zoos tend to become fat (Schwartz), but I don't know
whether this fat is mostly SC.
- If so, it might suggest the hominid-pongid LCA c 15 Ma already spent a lot
of time in water (google aquarboreal). Not impossible: hominids-pongids
crossed the Tethys to Eurasia c 18-17 Ma (google Austriacopithecus, eg, P
Holec & RJ Emry 2003 "Another Molar of the Miocene Hominid Griphopithecus
suessi from the Type Locality at Sandberg, Slovakia"
Bull.Am.Mus.Nat.Hist.279:625-631: "... littoral marine sediments contain
abundant fossils, predominantly of marine invertebrates. Less common are
marine vertebrates including fishes, sharks, Phocidae, sirenians and
cetaceans, and the remains of terrestrial vertebrates are also found
occasionally ... peninsula or archipelago extending into the Para-Tethyan
Sea."
- If not, we don't know when we got a lot of SC fat, but presumably after
the H/P LCA c 5 Ma.

Sweating: Gorillas & chimps (born with naked body, but soon (re)develop
upper fur) have eccrines on their body, but less than humans (I'm not sure
about orangs): this suggests eccrine sweating predates the HP/G LCA c 7 or 8
Ma. Hominids (sensu H+P+G) crossed the Med.Sea to Africa (possibly via &
dried-out Med.Sea), probably a bit before 7 Ma (when we find Sahelanthr +
anthracoptheres in Chad: via Lybian sea?). Thermo-active abundant sweating
on land is typical of sealions (water+salt).

Standing in water? No animal stands in water up to its nose AFAIK?
Possibly they found food in littoral forests like capuchin monkeys (also
thick enamel & tool use) do, eg ,they open mangrove oysters with shells.
Siamangs have large laryngeal airsacs: airsacs probably predate the
lesser/gr.ape LCA c 18 Ma: they kept the body vertically floating (not
standing), as is still seen in western lowland gorillas in forest swamps
(Ndoki etc.).
A vertical spine probably predates the Moroto vertebra (google Filler
upright ape), now estimated at c 19 Ma.

External nose 6-7 Ma? In the fossil record ext.noses (everted ossa nasalia)
are only seen in Homo <2 Ma.

Med.Sea 8 Ma: Oreopith in coastal swamp forests on Med.island.

Conclusion:
- Vertical hanging-floating-(?wading) aquarborealism is probably at least 19
Ma, possibly at first in freshwater (airsac) forest swamps.
- Littoral (forest?) adaptations (salt sweat) predate 7 Ma (HP/G LCA).
- Parttime diving (ext.nose) in salt water (loss of airsac in humans, google
laryngocele) is Pleistocene, not impossibly already earlier.
- Apes lived in Med.coastal forests possibly between 18 Ma (google Saudi ape
Heliopithecus or so) & 7 Ma (Oreopith), but their exact genetic connection
to our direct ancestors is unknown.

--Marc

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Relevant Pages

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