Published July 25, 2024
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TABLE 4 in Redescription of the deep-sea benthic ctenophore genus Tjalfiella from the North Atlantic (Class Tentaculata, Order Platyctenida, Family Tjalfiellidae)
Authors/Creators
- 1. The University of Maryland, Department of Biological Science, College Park, MD, 20742 USA & National Museum of Natural History, Smithsonian Institution, Department of Invertebrate Zoology, Washington, DC, 20560 USA
- 2. National Museum of Natural History, Smithsonian Institution, Department of Invertebrate Zoology, Washington, DC, 20560 USA & NOAA Fisheries, Office of Science & Technology, National Systematics Laboratory, Washington, DC, 20560 USA
Description
TABLE 4. Summary of the anatomical features for all three samples of TJalfiella specimens.
| Organism | Morphology | Size (mm) | Ratio to body | Remarks |
|---|---|---|---|---|
| TJalfiella tristoma (1910) | Body (tent. plane) | 20 | 1 | Cylindrical in tent. plane, “U” shaped w/ tentacles, white |
| Body (stom. plane) | 9 | 0.45 | Circular in stom. plane | |
| Arm (height) | 3.5–8 | 0.17–0.4 | Two, conical with aboral tentacle and gastric openings at vertex | |
| Arms width (tent. plane) | 4.7 | 0.24 | Variable depending on state of arm retraction | |
| Arms width (stom. plane) | 3 | 0.15 | Lacking an oral groove | |
| Mouth | 1.3 | 0.07 | Short and slit-like in stomodeal plane | |
| Suboral cavity | 3.2 | 0.16 | Long and voluminous with no documented color | |
| Stomodeum | - | - | - | |
| Tentacles(s) extended | - | - | Two, length not known but lack tentilla, yellow | |
| Tentacles(s) coiled | - | - | Two, length not known but lack tentilla, yellow | |
| Tentacle bulb | 2–3.3 | 0.1–0.17 | Two on opposing sides of apical organ, spherical | |
| Gonads | 3–3.8 | 0.15–0.19 | Eight, globular, on aboral face | |
| Brood pouches | 1.7–2.7 | 0.08–0.13 | 36, Large and arranged in 2–3 rows | |
| Embryo(s) | 2–4.5 | 0.1–0.22 | Housed within brooding pouches, development varies | |
| Apical organ | 0.1 | 0.01 | Sunken with large dome | |
| TJalfiella aff. tristoma (2018) | Body (tent. plane) | 10 | 1 | Rectangular in tent. plane, “U” shaped w/ tentacles, orange |
| Body (stom. plane) | 4.7–5 | .47–0.5 | Square in stom. plane, orange | |
| Arm (height) | 3.23–5.2 | .32–.52 | Two, conical with aboral tentacle and gastric openings at vertex | |
| Arms width (tent. plane) | 2.4 | 0.24 | Variable depending on state of arm retraction | |
| Arms width (stom. plane) | 2 | 0.2 | Lacking a original groove | |
| Mouth | 1.4 | 0.14 | Short and slit-like in stomodeal plane | |
| Suboral cavity | 3.98 | 0.4 | Long and voluminous, red | |
| Stomodeum | 1.13 | 0.11 | Cylindrical and no documented color | |
| Tentacles(s) extended | 0.17 | 0.01 | Two, length not known but lack tentilla, white | |
| Tentacles(s) coiled | 0.2 | 0.02 | Two, length not known but lack tentilla, white | |
| Tentacle bulb | 2 | 0.2 | Two on opposing sides of the apical organ, spherical | |
| Gonads | 2.2–2.44 | .22–.24 | Eight, globular, on aboral face | |
| Brood pouches | 1.36–1.62 | .13–.16 | 24, Large and arranged in 2–3 rows | |
| Embryo(s) | 0.8 | 0.08 | Housed within brooding pouches, development varies | |
| Apical organ | 0.13 | 0.01 | Sunken with large dome | |
| TJalfiella aff. tristoma (2022) | Body (tent. plane) | 7.6 | 1 | hemispherical in tent. plane, “U” shaped w/ tentacles, orange |
| Body (stom. plane) | 2.5 | 0.33 | Flattened/hemispherical in the stomodeal plane, orange | |
| Arm (height) | 2.06–3.42 | .27–.45 | Two, conical with an aboral tentacle and gastric openings at vertex | |
| Arms width (tent. plane) | 2.1–2.2 | .28–.29 | Variable depending on the state of arm retraction | |
| Arms width (stom. plane) | 1.8–2.1 | .23–.28 | Lacking an oral groove | |
| Mouth | 0.8 | 0.11 | Short and slit-like in stomodeal plane | |
| Suboral cavity | 2.67 | 0.35 | Long and voluminous, yellow-orange | |
| Stomodeum | 0.29 | 0.04 | Cylindrical and orange | |
| Tentacles(s) extended | 0.22 | 0.03 | Two, lack tentilla | |
| Tentacles(s) coiled | 0.41 | 0.05 | Two, coil and contract counterclockwise close to tentacle bulb | |
| Tentacle bulb | 1.29 | 0.17 | Two on opposing sides of the apical organ, spherical | |
| Gonads | .7–.92 | 0.09–0.12 | Six and spherical—four on one hemisphere, two on opposing | |
| Brood pouches | 0.46 | 0.06 | Three, small on one side of animal | |
| Embryo(s) | - | - | - | |
| Apical organ | - | - | - |
......continued on the next page
Notes
Published as part of Bezio, Nicholas & Collins, Allen G., 2024, Redescription of the deep-sea benthic ctenophore genus Tjalfiella from the North Atlantic (Class Tentaculata, Order Platyctenida, Family Tjalfiellidae), pp. 259-260 in Zootaxa 5486 (2) on page 259, DOI: 10.11646/zootaxa.5486.2.4, http://zenodo.org/record/13209847
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