Nothosaur Toys Karkinos Knot Dildo Review: Erotic Fantasy Crab Creation

10 out of 10
Last Updated on 20 August, 2025 by Cara Sutra

Welcome! I’m excited to share my thoughts about one of the tantalising new fantasy animal knot dildos from Nothosaur Toys. The Nothosaur Toys Karkinos Knot Dildo is a prominently textured and contoured kinky wonder, based on an erotic imagining of a powerful crab creature. Like the other fantasy dildos in the Nothosaur collection, Karkinos is customisable, so you receive the crab-themed creation that suits your body and desires. You can choose your preferred size, silicone firmness, colourway and base style.

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Related: Our Nothosaur Toys reviews | Huge dildo reviews

I picked mine in medium size, medium silicone firmness, with a suction base, and in a fade colour from E-03 at the tip to F-02 at the bottom. I think you’ll agree that the ice-to-ocean-floor blues look absolutely stunning. But how does it feel? Read on for all my filthy insights.

Nothosaur Toys Karkinos Knot Dildo Review: Erotic Fantasy Crab Creation

Why is it called Karkinos?

In ancient Greek mythology, Karkinos (or Carcinus), meaning ‘crab,’ was a giant crab sent by the goddess Hera to assist the Hydra during its battle with Heracles in the Labour of Lerna. Heracles killed the crab — some say he crushed it underfoot — and, in tribute to its loyalty, Hera placed it among the stars as the constellation Cancer. This mythological crab is the origin of the Zodiac sign Cancer in the Western astrological tradition.

Nothosaur Toys have reimagined the mythical Karkinos not just as a celestial crab, but as a fiery, androgynous creature of lust and contradiction. Their Karkinos creature is wild yet soft, aggressive yet yearning. The design draws from this erotic fantasy: a genderfluid beast born of desert flame, sculpted with ridges, bumps, and a bold central knot to echo its formidable, carapaced form. The textured body ignites pleasure like the teasing whisper of crab legs across skin, while the twin pleasure tips at the base — crab-like clitoral claws — tease and explore with curious, animalistic intent. Rather than being just another dildo, Karkinos is a creature of carnal impulse, craving wet devotion and offering mind-melting ecstasy in return.

How It Feels

I knew from the outset I’d need some lube when playing with my Nothosaur Toys Karkinos Knot Dildo. The silicone is deliciously squishy and pliable, but also fairly grippy, and I didn’t want any uncomfortable friction whilst trying to conquer Karkinos’ multi-bulge design. With a girth ranging from 4.1 inches around the tip, to 8.4 inches just above the base, I was a little intimidated, I must admit. However, once self-stimulated and aroused enough, I knew I’d be able to thrust this oceanic beast inside and enjoy every perversely crafted ridge, bulge and nodule.

When it came to playtime, there was still an undeniable battle for dominance between Karkinos and I. And I loved every second. I found it easiest to insert and slide down over the bulges and contours from the tip onwards when I made use of the suction base on a flat, smooth surface. I can then straddle and hover, with my feet safely on the floor and something nearby to hold on to for support, as I position Karkinos’ phallic tip at my pre-aroused, slick lips and slowly slide it between. An easy-dispense bottle of lube was kept within reach as well, just in case.

It’s so difficult to describe how it felt the first time I was able to take the full length of Karkinos’ crab-like contours. It feels so satisfyingly filling, it’s a genuine erotic thrill. It’s hard for me to distinguish the exact bulge, angle or nodule which feels best once the dildo is fully inside me. It all just blends into the appendage of a fantasy creature which is so otherworldly, so filthily non-human, yet so lustfully phallic, that the physical design and psychological impact take me by the throat and slam me against the door of an orgasm in no time.

As usual, I need a little vibrating help – I don’t usually orgasm through vaginal penetration or just by using a non-vibrating dildo. However, thanks to the pre-arousal needed in order to get this kink beast inside, I was already in the sexual pleasure zone before insertion. Once inside, it didn’t take long at all before that mindful pre-toy stim proved to be a real orgasmic benefit.

There are clitorally stimulating ‘claw’ pincers at the base of the Karkinos dildo, but despite feeling deliciously sensual rubbing against my aroused and sensitive clitoris, I had to add a little buzz from a bullet in order to take me over the crest of the wave, crashing down into a deep pool of climactic sensation.

As an unexpected bonus, though, I found that the pincers were fairly good at holding a small bullet vibe in place at the base of the dildo, allowing me to experience the clitoral buzz from that area whilst I was sat fully down on the dildo, kept securely in position on a smooth surface thanks to the suction base. Win!

The colour doesn’t physically add to the stimulation given intimately by Karkinos, but I’m so glad I chose the fade colours that I did. The differing blues from icy at the tip to dark blue at the base perfectly echoes the ‘creature from the oceanic abyss’ theme. I especially like to use mine in a deep, warm bubble bath, to echo the wondrous, watery vibes.

Nothosaur Toys Karkinos Knot Dildo Video

Get a close-up, IRL look at the Nothosaur Toys Karkinos Knot Dildo in my short video below. It shows packaging, a first look out of the bag, its wonderful textures and contours as well as how the suction base works:

Summary

The Nothosaur Toys Karkinos Knot Dildo is a wild ride both physically and mentally. The silicone feels nice and squishy but definitely grabs a bit, so you’ll want plenty of lube and some serious pre-play to get ready. Once you’re warmed up, it’s totally worth it. Every bump, ridge and nodule makes you feel like you’re being taken by some filthy sea beast that is weirdly alien but still wickedly cock-like. The girth gets seriously impressive near the base because of that signature knot dildo design and it really fills you up in the best way possible.

The suction cup base is a lifesaver because it lets you go hands-free and get the angle and depth just right. Those two claw-like bits at the base are perfect for teasing the outside and they even lightly hold a small bullet vibrator. While I don’t usually orgasm from penetration alone, this combo of deep filling and buzzy clit action got me over the edge pretty quickly. Plus, the fade from icy blue to dark ocean blue is gorgeous and perfect for some filthy underwater fun in the bath.

Pros
  • Richly detailed fantasy design with a strong erotic narrative
  • Squishy, high-quality platinum silicone
  • Grippy texture adds to the sensation
  • Suction base enables hands-free play
  • Pleasurable fullness with unique contouring and knots
  • Base pincers/claw stimulate externally and can lightly hold a bullet vibe in place
  • Visually stunning fade colour options
  • Excellent for fantasy and monster-fuck kink fans
Cons
  • Requires lots of lube due to texture and girth
  • Not ideal for beginners or those unused to girthy toys
  • May need clitoral stimulation for orgasm (for some users)
  • Can be physically demanding to use, especially in upright positions

Nothosaur Toys Karkinos Knot Dildo Review: Erotic Fantasy Crab Creation

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Craving a deep-sea fantasy of your own? Head through the button below to get your Nothosaur Toys Karkinos Knot Dildo:

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General Info & Specs

I have the Nothosaur Toys Karkinos Knot Dildo in medium size, medium silicone firmness, suction base and with a fade colour from E-03 at the tip down to F-02 at the bottom.

Packaging & Unboxing

My Nothosaur Toys Karkinos Knot Dildo arrived in Nothosaur’s usual discreet outer packaging for the post – a plain box – while the dildo itself is sealed into a transparent front, opaque back plastic bag. Snip or tear away the top to retrieve the dildo.

Storage Bag

Along with the Nothosaur Toys Karkinos Knot Dildo I received a Nothosaur-design, large fabric drawstring storage bag.

Size & Measurements

This medium size Nothosaur Toys Karkinos Knot Dildo measures, by my measurements:

  • 8 inches total length
  • 5 inches maximum insertable length
  • Girths of 4.1 inches (tip bulge), 6.1 inches (mid bulge), 8.4 inches (just-above-base bulge)

Buy Yours

Ready to ride the waves with Karkinos? Click below to buy your own Nothosaur Toys Karkinos Knot Dildo and dive into ecstasy:

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Thanks so much to nothosaurtoys.com for sending me the above product free of charge, in exchange for my fair & honest review here at carasutra.com. This sponsored review contains affiliate links.

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