Shyxaure Species in Astra Planeta | World Anvil
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Shyxaure (ʂɪks-ʌʊɹ-ɹə, often abbreviated to shyx) are a bipedal, winged, vaguely humanoid species of volant sophonts from the planet Delvasi in the Aelycah (Delta Pavonis) system. These sophonts are remarkably durable and can tolerate a broad range of temperatures, but due to their high metabolic demands they are far more prone to hypoxia than other known sophont species. In fact, while most other species can easily breathe Delvasi's air, shyxaure will suffocate in many otherwise breathable atmospheres; at one bar of pressure, any O2 percentage below 30% is much too thin for the shyxes' hyperactive oxygen metabolism.


Anatomy & Morphology

Shyxaure are vertical bipedal hexapods, with two sets of forelimbs (a set of manipulatory limbs in the front of the upper torso and a pair of large, paneled wings behind them) and a pair of hindlimbs used for terrestrial locomotion. The lower section of the spine transitions into a medium-length tail with a small cartilaginous "sail" at the tip, used as a balance mechanism while on the ground and a rudder while in flight or swimming.   Shyx skeletons are composed primarily of collagen, calcium phosphate, iron oxide, and bioceramics. Their bones have a reinforced internal lattice structure that makes them considerably less dense than humans'; and a side effect of their composite nature is their unusual color: vivid pink. Their vascular oxygen carrier is hemoglobin, an iron-based protein that turns bright red when oxidized. Though efficient, hemoglobin is easily damaged by carbon monoxide, rendering shyxaure one of just three known sophont species susceptible to carbon monoxide poisoning.   Shyxaure are mostly covered by a short but appreciably dense coat of semi-branching keratinous filaments called parafeathers, which vary in coloration ranging from warm oranges and yellows to greens, blues, and even occasionally violet. Most shyx have a "mane" composed of twin rows of overlapping sail-like fins formed by skin supported by modified parafeather spines. This pair of crests runs from just above the eyes down the neck, fins gradually decreasing in size.

Perception & Sensory Capabilities


The visual sense is absolutely critical to shyxaure. They are incredibly visual beings, with most of their technology and culture involving crucial optical aspects. Shyx vision is facilitated by a pair of binocular focal eyes, one set on either side of the skull (delvasigenid skulls reversing the orientation of the skull and mandible), which are able to detect motion, definite shape, spatial orientation, and a wide spectrum of color ranging from near-infrared well into the ultraviolet.  


Shyxaure are also very reliant on their auditory sense, facilitated by a pair of dense, tapering, fin-like antennae (called "earfins") towards the rear of the skull that are part of the twin crests. These have an organ at their base that functions similarly to a Johnston's organ found in terragenid arthropods: several nerve clusters linked to the earfins are activated separately by different stimuli, which allow the shyx to instinctively "hear" the difference between sonic and gravitic stimuli.  


Shyxaure olfactory sense is considerably more sensitive than that of humans, with a significantly larger nasal passageway than other sophonts to allow for larger air volume intake through a linked pair of spiracles in the upper snout.  


Shyxaure are particularly sensitive to ambient airflow thanks to their parafeathers. Their entire epidermis is sensitive to tactile input as well, though the effect is most intense in the manipulative structures at the ends of the upper limbs.


Geographic Origin & Distribution

Shyxaure are fairly common in the "southern" region of known space, tending to be more common closer to their home system (Aelycah) and the Pavo constellation.  

Habitat & Survival Factors

The optimal survival range in a variety of factors for an unequipped shyxaure is quite wide to begin with, but given the technology and/or resources to build said technology, shyx can eke out a living almost anywhere in the universe given sufficient oxygen content and space to exercise their wings.



Shyxaure are one of only three sophont species in known space with a universal common tongue: Elashi, a breathy, wide-mouthed language with hissing and guttural accents and infrequent hard consonants. Elashi is fairly easy to pronounce if read in its alphabet, but transcriptions of Elashi can often render phonetic interpretation challenging.   Almost every shyxaure born in systems of the Shyxaure-Ziirpu Alliance speaks Elashi, and many of those who hail from worlds outside the Alliance speak the language as well, making it one of the five most common interstellar tongues.

Archive Data

Scientific Name
Xenoharpia sapiens
Home system
Aelycah (Delta Pavonis)
Genesis group
Biochemical base
Respiration compounds
biochemical multicellular
Gravity-relative orientation
Limb configuration
bipedal bipteral hexapod
Average height
2 m
Average length (with tail)
3 m
Average wingspan
5 m
Average mass
48 kg
Focal type
Sensory modes
  • visual (260 - 750 nm)
  • auditory (30 Hz - 40 kHz)
  • tactile (1 μm limit)
  • olfactory
Social type
The values presented here describe the conditional limits of sustained indefinite survival. The species can survive more extreme conditions for shorter amounts of exposure.
Gravity limit
1.5 G
Pressure range
0.7 to 3.1 atm
Air mix
30% to 72% O2
Temperature range
10 to 30 °C
Radiation limit
  • Gamma: 0.25 Gy
  • Beta: 0.05 Gy
  • Alpha: 0.0125 Gy

Interspecies Relations

In 11776 UME, the shyxaure encountered the ziirpu when an expedition from Delvasi arrived in the Hmn Çelyth system, which the ziirpu were already in the process of exploring. This led to the establishment of the Shyxaure-Ziirpu Alliance, a peaceful agreement between both species' interstellar civilizations that flourishes to this day. After first contact with humans and skae in 12280 UME, the SZA helped form the United Spacefaring Sophonts Coalition.


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