Claims material, not an established taxonomy
Non-human entity hypotheses
What form the primary witness described — including the forms no case in the corpus manages to satisfy. Of 387 cases, 41 describe (or claim without describing) an entity. The rest document only an object.
Present forms
gris
Grey
Head large in proportion to the body, dark almond-shaped eyes, pale or waxy skin. The corpus's dominant morphotype.
origin → Classical Extraterrestrial Hypothesis (ETH)
peluda-garras
Small, hairy, clawed
Short stature, fur or dark skin, clawed limbs, erratic movement. Closer to the regional cryptid than to the science-fiction grey.
no origin reading
robotica
Robotic / synthetic
Pincer hands, mechanical movement, metallic finish or wrinkled skin. Never appears alone: always alongside a humanoid in the same encounter.
origin → Classical Extraterrestrial Hypothesis (ETH) · Simulation Avatar
luminosa
Luminous / plasmoid
No fixed body, presented as a conscious presence rather than an object. Grusch places it among non-human intelligences; AARO reads it as natural plasma.
origin → Multidimensional · Psychospiritual Contact · Control System
craneo-alargado
Elongated skull
Elongated cranium, oval eye sockets, three-fingered hands. Both corpus cases arrive via an exhibited body, not a live encounter.
no origin reading
alto-humanoide
Tall, near-human
Tall stature with human proportions and isolated deviations. No documentary relation to pop culture's 'Nordic' archetype.
origin → Classical Extraterrestrial Hypothesis (ETH)
alada
Winged
Considerable wingspan, marked eyes, near-vertical flight. Belongs to the cryptid tradition, not the extraterrestrial reading.
origin → Crypto-Terrestrial / Atlantean
sin-forma
Asserted, not described
The case asserts there was an entity —a recovered body, an occupant in custody— but describes no form at all. It is the most common answer when the claim arrives through institutional or secondhand channels, which is why it is worth being able to list.
no origin reading
Known archetypes, no case in the corpus
They exist in the broader UFO literature. No case meets the editorial standard — they are documented for that reason, not for lack of searching.
Reptiloid
0 casesA central archetype of UFO culture with no case of its own in the corpus: what exists is uncorroborated single testimony, or retroactive rereading of cases that never described it that way.
Mantis / insectoid
0 casesNo case of its own in the corpus: the available material comes almost entirely from memory recovered under regressive hypnosis, without the independent witnesses that did reinforce Allagash.
Feline
0 casesNo confirmed case, yet the only absent form with a candidate institutional anchor: an entry ('case 848') in a declassified Australian document, not yet verified against the primary source.
Spiritual / angelic
0 casesNo case of its own in the corpus: what exists is religious rereading of cases already included on other merits, or uncorroborated single-contactee testimony.