TABLE 4 in Redescription of the deep-sea benthic ctenophore genus Tjalfiella from the North Atlantic (Class Tentaculata, Order Platyctenida, Family Tjalfiellidae)

TABLE 4. Summary of the anatomical features for all three samples of TJalfiella specimens.
OrganismMorphologySize (mm)Ratio to bodyRemarksTJalfiella tristoma (1910)Body (tent. plane)201Cylindrical in tent. plane, “U” shaped w/ tentacles, whiteBody (stom. plane)90.45Circular in stom. planeArm (height)3.5–80.17–0.4Two, conical with aboral tentacle and gastric openings at vertexArms width (tent. plane)4.70.24Variable depending on state of arm retractionArms width (stom. plane)30.15Lacking an oral grooveMouth1.30.07Short and slit-like in stomodeal planeSuboral cavity3.20.16Long and voluminous with no documented colorStomodeum---Tentacles(s) extended--Two, length not known but lack tentilla, yellowTentacles(s) coiled--Two, length not known but lack tentilla, yellowTentacle bulb2–3.30.1–0.17Two on opposing sides of apical organ, sphericalGonads3–3.80.15–0.19Eight, globular, on aboral faceBrood pouches1.7–2.70.08–0.1336, Large and arranged in 2–3 rowsEmbryo(s)2–4.50.1–0.22Housed within brooding pouches, development variesApical organ0.10.01Sunken with large domeTJalfiella aff. tristoma (2018)Body (tent. plane)101Rectangular in tent. plane, “U” shaped w/ tentacles, orangeBody (stom. plane)4.7–5.47–0.5Square in stom. plane, orangeArm (height)3.23–5.2.32–.52Two, conical with aboral tentacle and gastric openings at vertexArms width (tent. plane)2.40.24Variable depending on state of arm retractionArms width (stom. plane)20.2Lacking a original grooveMouth1.40.14Short and slit-like in stomodeal planeSuboral cavity3.980.4Long and voluminous, redStomodeum1.130.11Cylindrical and no documented colorTentacles(s) extended0.170.01Two, length not known but lack tentilla, whiteTentacles(s) coiled0.20.02Two, length not known but lack tentilla, whiteTentacle bulb20.2Two on opposing sides of the apical organ, sphericalGonads2.2–2.44.22–.24Eight, globular, on aboral faceBrood pouches1.36–1.62.13–.1624, Large and arranged in 2–3 rowsEmbryo(s)0.80.08Housed within brooding pouches, development variesApical organ0.130.01Sunken with large domeTJalfiella aff. tristoma (2022)Body (tent. plane)7.61hemispherical in tent. plane, “U” shaped w/ tentacles, orangeBody (stom. plane)2.50.33Flattened/hemispherical in the stomodeal plane, orangeArm (height)2.06–3.42.27–.45Two, conical with an aboral tentacle and gastric openings at vertexArms width (tent. plane)2.1–2.2.28–.29Variable depending on the state of arm retractionArms width (stom. plane)1.8–2.1.23–.28Lacking an oral grooveMouth0.80.11Short and slit-like in stomodeal planeSuboral cavity2.670.35Long and voluminous, yellow-orangeStomodeum0.290.04Cylindrical and orangeTentacles(s) extended0.220.03Two, lack tentillaTentacles(s) coiled0.410.05Two, coil and contract counterclockwise close to tentacle bulbTentacle bulb1.290.17Two on opposing sides of the apical organ, sphericalGonads.7–.920.09–0.12Six and spherical—four on one hemisphere, two on opposingBrood pouches0.460.06Three, small on one side of animalEmbryo(s)---Apical organ---
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