I don't think it makes sense for them to shrink to one-tenth of its ancestor's size all at once, given the starting size was only 1.5 m. Its ancestor's size as roughly the size of dwarf island elephants, and there's probably a point where the shrinkage patterns level off. I was going to bring up thermoregulatory problems from such a sudden downscaling that would require extra fur, but the environment's tropical anyway and this does appear slightly furrier than its ancestor.

What happened to the scales on its underside? The description doesn't mention them. Are they vestigial, and well-hidden by fur?

"appearance. With" That should be one sentence.
"ancestor: The" should be "ancestor: the".
Strange...they're shaped like Pac-Man ghosts.

It's an interesting brittle star-like organism.

Darn, I also have an unreleased Magnethead descendant that's been in my files for years. I'll have to release that one soon.

"being able to use magnetosensory". (Don't you mean "magnetosensory organs"?)

"cuhsion" should be "cushion".

I like the background details.

I like the pose, background, and trasparency effects.

I was going to argue that, based on the Sauceback physiology page, it would surely adapt to its sense of smell instead, but then I did some research and found out cold air delivers smells less efficiently. Between its echolocation being defeated by snow, its sense of smell blunted by cold air, and the Alpha timeline's lower scientific standards, it all seems feasible.

Aren't pinhole eyes too far in the stages of development of the eye to appear all at once? Admittedly, the fact it has nostrils would provide the pits necessary for proper eyes to grow, but that's a lot of photoreceptors at once.

Sure. I brought up the potential for hybridization because it might make things neater than having two closely-related species in the same habitat with similar levels of intelligence.

More to the point of the topic...Harnessbacks are also mentioned as being "smart".

I decided to do a quick tally by entering the keyword "intelligent" into the wiki.

Fisticoats, a relative of the Boomcracker (shared immediate ancestor) is also likened to an elephant. The description says:
"Despite their near-elephantine, lengthy and (apparently) loving parental behavior, fisticoats are not quite gentle giants."
It's also mentioned they can be taught "tricks" based on their natural behavior of limited "speech":
"As trivia, it is fairly easy to teach young fisticoats to punch colleagues when that colleague says a particular phrase. This is because mother fisticoats, when around food, may indicate that food to their offspring with a particular tooting sound. The young fisticoat then responds by shattering the indicated food. Though it's easier to teach a young fisticoat this trick, it's not impossible to teach an adult. "

Their tongues are also similar to human hands in thick gloves, with three "fingers" and a thumb. Although having fingers is surely not related to humanlike intelligence, it should help with tool use. Interestingly, both the Boomcracker and Fisticoat are in the same genus and share the Ramul Temperate Beach (originally Coolsteph Temperate Beach) environment. It's not out of the question they could hybridize, especially since plents' method of mating probably wouldn't make it dangerous for a 50 cm-long (Fisticoat) and 80-cm long (Boomcracker) fauna to mate.

----

The Hairy Gossalizard is noted to have increased intelligence relative to its ancestor, and some behaviors which might reflect that:
"he hairy gossalizard's intelligence has increased somewhat and it can weave small nets out of the silk using its hands to fix them. When small prey passes by it, the hairy gossalizard will toss the net onto its prey, shoot an extra shot of silk, and wrap it up to make sure it does not escape. They can even save it for later."

While the Hairy Gossalizard itself is extinct, it has several descendants: the Warf Gossalizard, Desert Gossalizard, and Gracing Gossalizard. None have been noted to have lost intelligence. Two out of three mention being "slightly warm-blooded", and this is surely true for the Grazing Gossalizard as well. The Grazing Gossalizard itself, while not gregarious, does congregate in big numbers where the food supply is abundant. The ancestor to the Hairy Gossalizard itself, the Gossamer Lizardworm, is noted to be somewhat intelligent.

Of the Gossamer Lizardworm's other descendant, the Eerie Gossalizard, has four living descendants: the Rainforest Gossalizard, Woodland Gossalizard, Digging Gossalizard, and Tyrant Gossalizard. The Woodland Gossalizard mentions "males are only social when trying to attract a mate", which could mean the males are the most social (if only in a breeding context) or that the females have unspecified sociality, but the males have much less sociality. It's likely some of them have lost intelligence for lack of need in their hunting methods, though.

The Festive Uktank has notable intelligence. Its descendant, the Green Uktank, doesn't mention any intelligence increases, but they have begun living in herds.

Varants are somewhat intelligent, too.

The Shockscooter and Kyutescoot are pretty intelligent.

Dualist Bandersnatches can throw rocks and debris. Several of its ancestors used tools, too, although one of the Dualist Bandersnatch's decendants is specifically noted to no longer use tools.

I like how this goes into detail on their reproductive physiology, since it's vague for most plents. I think the only plent to have a diagram of exactly how it reproduces was a long-extinct ant-like pseudo-mammal.

I'm saying you should lengthen the snout overall, to make it more plausible it could still eat, instead of having a smashed-in pug-like face. Keeping the big, bulbous nose is plausible, with some explanation.

It's hard to read how its musculature works. Do its palms face downwards or inwards?

It will be necessary to make drastic modifications to the image, if not redraw it entirely.

It's weird that this huge, voracious predator with such a broad diet doesn't even consider eating thornback descendants in the Fermi Polar Beach biome. If it only eats things which taste like seafood, it would surely eat baby and juvenile flumpuses. (Unless they're intimidated by how they guard their young so ferociously...but they are also very aggressive and don't seem that smart)

"It can scent using chemoreceptors the inside of its mouth and vocalize with a “toot” from its butt nostril."
You meant "smell", and "in the inside of its mouth".

This is an interesting development.

" Each day it slowly moves to the sea, from the land looking rather inept for land. This is due to its change in body composition, which is now more suited for maneuvering the waters."
You surely meant:

"Each day it slowly moves to the sea from the land, looking rather unsuited for land life."
You should elaborate on its "change in body composition". That suggests its molecular or chemical composition is different, such as by having a greater proportion of its mass made up of blubber. That particular example would make sense, since a bunch of marine mammals have blubber, but the picture and past ancestry would suggest it's more like a sea otter.

"taking a triangular form, to easen its swimming." "Easen" is not a word. You surely meant "ease". Although it made sense for it to gain smaller or more streamlined ears, the fact the rest of its body isn't particularly hydrodynamic makes this questionable.

It has a rather large nose and a rather flat-faced, brachycephalic-style head, even given its flat-faced ancestor. Now, this "wombat in the style of Rocko's Modern Life" sort of look could make sense if it specialized in crunching up hard foods, encouraging short but massive jaws, but the image would still need to be modified.

I can't parse its nose, so that will have to be modified. If you want to keep a similar shape, though, looking at hooded seals or elephant seals could provide inspiration on why its nose would be so bulbous.

I second Disgustedorite's observation. The easiest way to deal with the weird claws and nose is saying they're sexual display features or ornamentation specifically for the mating season. (not the best explanation, but Alpha has looser standards than Beta.)

I second Disgustedorite's observation. It would at least need some kind of noteworthy adaptation to endure crossing the tropics, even if it's somewhat protected within the nests. Wouldn't the inside of the floating nest still be hot and humid while crossing the tropics?

"In order for it to defend itself[...]" This sentence is too long, and should be split up.
Did you mean "taken up hitchhiking on seashrog nests"?
Wow...it seems a lot of the latest organisms use Seashrog nests to massively expand their ranges. A chimpanzee-otter has created a localized Noah's Ark, apparently.

The Kyutescoot was supposed to be a similarly adorable pseudo-pet, but I eliminated almost all of that because I wasn't sure if eashrog psychology worked that way. (That, and because I played up the Dad-shaped Frog Wants To Go Fishing look)

It's interesting how it's so adapted for life in Seashrog nests.

I like the fur detail and thoroughness on its physiological changes.

With all that species-spreading, there's sure to be a floral clash.

How remarkable----I, too, was thinking of a series of tiny islands that remained of Coolsteph Island, although my idea was coral reef-based islands built on top of de facto seamounts of the tallest parts of Coolsteph Island.

"lost of Coolsteph" should be "loss of Coolsteph".

It's too late to change the design, right? I realize those grey lips/margins of the mouth are rather unflattering.

The foreground Kyutescoot is a direct side view. The one in the background is a front view. The exact angles were inspired by two individual Shockscooters in the Shockscooter image: the one on the far left, and the one with its mouth open on the right, which seems to be arguing. If you're confused, it's probably because of minor sizing and sharpness issues to distinguish things that are closer from things that are farther away, as well as the fact Kyutescoots really don't look good from the front. In fact, I was uncertain about whether to include the frontal view at all, until I realized it would be so helpful for making descendants.

I can provide images of the Sculptris sculpt from multiple angles as a supplementary image, if it helps. I didn't do that earlier because I was running out of time for my submission.

Kyutescoot (Scootypuffjr kyuti)
Creator: Coolsteph
Ancestor: Shockscooter
Habitat: Ramul Temperate Beach, Ramul Temperate Coast
Size: 12 cm tall
Diet: Coprovore, Detritivore, Carnivore (Minikruggs, Dartir larvae, Aphluks)
Reproduction: Sexual, Spawning, Two Genders

It shares the same linage as the Bijadadu, in the period where the low-lying Coolsteph Island shrank into multiple, smaller islands. They developed on a set of small islands where they adapted to a decreased food supply by becoming smaller. Aided by their smaller sizes, some eventually travelled to Ramul on rafts of Darwinian Diaminet, Colonial Bobiiros, Pioneer Raftballs, and occasionally larger fauna, like Pygmy Hullbacks. Their talon-like feet help them grip rafts or large fauna in storms, as well as Darwin Thornshells and other large, low-lying flora.

They are more aquatic than their relative, the Minizap, helping it partition beach and near-shore habitats. It is faster, too, than the Bijadadu: it can walk in a duck-like manner or make weak hops.

In contrast to the Bijadadu, which grew dimwitted and aggressive due to genetic disorders caused by inbreeding, the Kyutescoot became friendlier. Like a dodo, it has relatively little fear of large, potentially predatory fauna. Unlike a dodo, the Kyutescoot retains decent defenses. Its long, hard spines make it difficult and painful for predators to swallow whole. A predator touching two spines completes a circuit, causing a zap, but the Kyutescoot can create zaps of electricity at will. It happens that their response to being afraid or startled is an especially strong zap, allowing it to discourage predators even with their low levels of fear and aggression. Some of the more skittish predators are scared off by the sheer, sudden novelty of electrical sparks, in the sight, unpredictable movement, and popping sounds. The electric shocks work even better when the predator is wet: a common occurrence in its beach habitats.

Its only predator at time of evolution is the Lari Phyler, and only when it ventures out into Soma Temperate Coast on floating rafts. As such, it almost never outright panics unless attacked from above.

Building off their tendency to raft on large flora and fauna and follow them, it is occasionally a passenger on Seashrog rafts. Seashrogs are variously fascinated by or frightened by their sparks, but it is much less aggressive than the Kakonat,

They closely follow large fauna, especially the Magnificent Slaeosaurus, and wait for them to excrete. Although they prefer fresh dung, they will eat less-fresh dung as well, incidentally consuming dung-feeding, insect-like species. Unlike its ancestor, the Kyutescooter will also eat the owl pellet-like dung of various plents, though it is less favored. Like their ancestor, Kyutescoots are intelligent, and learn to predict behavioral trends by species or for individuals, especially if they receive most of their food from only a handful of individuals. Older individuals may figure out how to ride on the tails of familiar large, easily rideable fauna as they haul themselves around on land, sparing them the effort of walking. It is this habit that has led them to rarely eat blood-sucking Aphluks on plent hosts, when they happen to smell like dung.

Due to their limited diet, low tolerance of tropical temperatures, and tendency to get eaten by Kakonats when they get desperate on long voyages, they haven't been able to spread far on Seashrog rafts.

It has developed eyelids, which helps it with glare while rafting.

This is an interesting development.

"using spore," You mean "spores", in the plural.
It's a plausible development to make it into a genus group.