| TJalfiella tristoma (1910) | Body (tent. plane) | 20 | 1 | Cylindrical in tent. plane, “U” shaped w/ tentacles, white |
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| Body (stom. plane) | 9 | 0.45 | Circular in stom. plane |
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| Arm (height) | 3.5–8 | 0.17–0.4 | Two, conical with aboral tentacle and gastric openings at vertex |
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| Arms width (tent. plane) | 4.7 | 0.24 | Variable depending on state of arm retraction |
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| Arms width (stom. plane) | 3 | 0.15 | Lacking an oral groove |
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| Mouth | 1.3 | 0.07 | Short and slit-like in stomodeal plane |
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| Suboral cavity | 3.2 | 0.16 | Long and voluminous with no documented color |
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| Stomodeum | - | - | - |
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| Tentacles(s) extended | - | - | Two, length not known but lack tentilla, yellow |
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| Tentacles(s) coiled | - | - | Two, length not known but lack tentilla, yellow |
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| Tentacle bulb | 2–3.3 | 0.1–0.17 | Two on opposing sides of apical organ, spherical |
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| Gonads | 3–3.8 | 0.15–0.19 | Eight, globular, on aboral face |
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| Brood pouches | 1.7–2.7 | 0.08–0.13 | 36, Large and arranged in 2–3 rows |
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| Embryo(s) | 2–4.5 | 0.1–0.22 | Housed within brooding pouches, development varies |
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| Apical organ | 0.1 | 0.01 | Sunken with large dome |
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| TJalfiella aff. tristoma (2018) | Body (tent. plane) | 10 | 1 | Rectangular in tent. plane, “U” shaped w/ tentacles, orange |
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| Body (stom. plane) | 4.7–5 | .47–0.5 | Square in stom. plane, orange |
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| Arm (height) | 3.23–5.2 | .32–.52 | Two, conical with aboral tentacle and gastric openings at vertex |
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| Arms width (tent. plane) | 2.4 | 0.24 | Variable depending on state of arm retraction |
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| Arms width (stom. plane) | 2 | 0.2 | Lacking a original groove |
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| Mouth | 1.4 | 0.14 | Short and slit-like in stomodeal plane |
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| Suboral cavity | 3.98 | 0.4 | Long and voluminous, red |
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| Stomodeum | 1.13 | 0.11 | Cylindrical and no documented color |
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| Tentacles(s) extended | 0.17 | 0.01 | Two, length not known but lack tentilla, white |
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| Tentacles(s) coiled | 0.2 | 0.02 | Two, length not known but lack tentilla, white |
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| Tentacle bulb | 2 | 0.2 | Two on opposing sides of the apical organ, spherical |
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| Gonads | 2.2–2.44 | .22–.24 | Eight, globular, on aboral face |
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| Brood pouches | 1.36–1.62 | .13–.16 | 24, Large and arranged in 2–3 rows |
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| Embryo(s) | 0.8 | 0.08 | Housed within brooding pouches, development varies |
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| Apical organ | 0.13 | 0.01 | Sunken with large dome |
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| TJalfiella aff. tristoma (2022) | Body (tent. plane) | 7.6 | 1 | hemispherical in tent. plane, “U” shaped w/ tentacles, orange |
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| Body (stom. plane) | 2.5 | 0.33 | Flattened/hemispherical in the stomodeal plane, orange |
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| Arm (height) | 2.06–3.42 | .27–.45 | Two, conical with an aboral tentacle and gastric openings at vertex |
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| Arms width (tent. plane) | 2.1–2.2 | .28–.29 | Variable depending on the state of arm retraction |
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| Arms width (stom. plane) | 1.8–2.1 | .23–.28 | Lacking an oral groove |
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| Mouth | 0.8 | 0.11 | Short and slit-like in stomodeal plane |
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| Suboral cavity | 2.67 | 0.35 | Long and voluminous, yellow-orange |
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| Stomodeum | 0.29 | 0.04 | Cylindrical and orange |
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| Tentacles(s) extended | 0.22 | 0.03 | Two, lack tentilla |
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| Tentacles(s) coiled | 0.41 | 0.05 | Two, coil and contract counterclockwise close to tentacle bulb |
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| Tentacle bulb | 1.29 | 0.17 | Two on opposing sides of the apical organ, spherical |
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| Gonads | .7–.92 | 0.09–0.12 | Six and spherical—four on one hemisphere, two on opposing |
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| Brood pouches | 0.46 | 0.06 | Three, small on one side of animal |
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| Embryo(s) | - | - | - |
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| Apical organ | - | - | - |
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