Life in the Open Ocean. Joseph J. Torres

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on medusae that are large enough to allow its feeding apparatus to function effectively.

Schematic illustration of feeding behavior of Pelagia noctiluca on motile prey.

      Source: Rottini‐Sandrini and Avian (1989), figure 1 (p. 52). Reprinted by permission from Springer Nature Customer Service Centre GmbH Springer‐Verlag, Marine Biology, Feeding mechanism of Pelagia noctiluca (Scyphozoa: Semaeostomeae), Rottini‐Sandrini and Avian, 1989.

      Source: Adapted from Madin (1988), table 2 (p. 423).

Species Encounter zone – shape of space Tentacle deployment a pattern (see Figure 3.17) Encounter zone – volume (cm3) Tentacular length (m) Tentacular volume (cm3) Tentacle densityb (ppm) Prey types
Medusae
Calycopsis typa Disc 3.17A 850 12 0.0942 110.20 Large prey – types unknown
Stomotoca pterophylla Sphere 3.17B 900 000 2.4 0.0033 0.00 Medusae, other gelatinous spp.
Aequorea macrodactyla Cone 3.17C 1 500 000 200 0.7697 0.53 Salps, ctenophores, pteropods, forams, medusae
Laodicea undulata Disc 3.17C 175 18 0.0088 50.00 Small crustacea, larval fish
Dichotomia cannoides Cone 3.17C 50 7.5 0.0019 36.80 Small crustacea types unknown
Liriope tetraphylla Sphere 3.17B 220 000 3 0.0052 0.02 Heteropods, appendicularia, larval crustacea, juvenile fish
Solmundella bitentaculata Cylinder 3.17B 2 0.1 0.0118 5000.00 Gelatinous species
Aeginopsis laurentii Cone 3.17D 100 0.2 0.0471 476.20 No data
Somaris spp. Cone 3.17D 2 0.3 0.0001 40.00 Small motile species, types unknown
Pelagia noctiluca Cone 3.17C 8 700 000 24 0.1794 0.21 Salps, ostracods, ctenophores, polychaetes, copepods, fish
Siphonophores
Sulculeolaria spp. Cylinder 3.17E,F 257 000 243.2 1.0400 4.10 Copepods
Forskalia spp. Cylinder 3.17E 434 000 88.2 0.2400 0.56 Copepods, amphipods, chaetognaths, molluscs, fish, fish eggs