Here is a rough sketch of the three alien races I've been hashing out.
Collectively they are known as Tryptids, due to the trio being genetically identical.
All three races share the same DNA and play a vital role in the reproductive cycle of the others.
All three races are hermaphroditic, but their equipment is designed for the other races and not their own, even though each will only bear it's own young.

The Caratopanzi, or Caratopes are goatlike in appearance.
They can be impregnated by the Asquenza, and are sought out by the Ezuul once every few years to inseminate their egg sacs.
Despite not being capable of intercourse with one another Caratopes are very intimate and emotional, and tend to form life bonds with one another called trusts. A Caratope trust will help one another in virtually every way, from assisting climbs, protecting from ambitious fraternities of Asquenza, to raising each others' young. Caratopes tend to fit in to the middle class in canyon society, and need to rely more on skill and training to reach their destinations.
Caratopes refer to Asquenza with male pronouns, and Ezuul with female pronouns. They have no pronoun preference amongst themselves.

The Ezuul are standoffish, status obsessed and territorial. Unless in a urban area, Ezuul will not tolerate one another within a half a mile radius of their camps or claims. Ezuul seek out Caratopes to inseminate their eggs once every few years, and in between will lay several hundred eggs worth of egg sacs. They do not care for their young beyond laying unfertilized eggs for their first meal. Ezuul are highly cannibalistic, and will whittle down their own numbers drastically before reaching their adult molt. Ezuul do not care for companionship, and receive almost no pleasure from sex (though over the course of the several hours it takes a Caratope to fertilize their eggs, they will be very nurturing with their partner). Ezzul see sex as only a means to reproduce, and tend to only perform it in some form of prostitution, be it either offering a dowry to worthy Caratopes for sex, or demading tithes of mineral oils or ore from Asquenza in exchange for their spermatomas. Ezuul are considered to be upper class due to their exceptional abilities as climbers, and tend to live in higher areas.
Ezuul refer to Caratopes with male pronouns, and Asquenza with female pronouns. They refer to themselves as females.

Asquenza are veiwed as lower class citizens despite being adept climbers, due to their preference of habitat deep in the thermal vents. They lay their eggs and watch over them until they hatch, leaving the young to fend for themselves. Those that survive long enough form small social "pledge gangs" helping each other forage, and learn from the adults via observation. When they come of age, Asquenza are intiated into Fraternities, where they will be properly trained and employed. Asquenza culture is highly promiscuous. It is nearly impossible for any race to come in contact with an Asquenza Fraternity and not be bombarded with mating offerings regardless of species or sex. Unfortunately it is not uncommon for an Asquenza Fraternity to attempt gang rape on a lone Caratope. Asquenza do not use their female organs however, as their cloaca is small and only accommodating to the palps of the Ezuul.
Asquenza refer to Ezuul with male pronouns, and Caratopes with female pronouns. They refer to themselves in a male context.