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1 September 2008 Pseudopodial features and feeding behavior of living nassellarians Eucyrtidium hexagonatum Haeckel, Pterocorys zancleus (Müler) and Dictyocodon prometheus Haeckel
Kazuhiro Sugiyama, Rie S. Hori, Yoshitaka Kusunoki, Atsushi Matsuoka
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Abstract

Light microscopic studies, using both video imaging and normal camera, were made on living nassellarian radiolarians Eucyrtidium hexagonatum Haeckel, Pterocorys zancleus (Müler) and Dictyocodon prometheus Haeckel from the East China Sea off Okinawa Island, Japan. Continuous and careful observations revealed pseudopodial activity related mostly to feeding behavior. The results are presented in detail with the definition of 11 descriptive terms for nassellarian pseudopodia. Among them, terminal projections (TP) extending as straight projections from the aperture of the shell body and forming a conical structure (terminal cone: TC) and axial projections (XP) prolonged outward from the center of the aperture and proximally surrounded by TP are used for feeding. Although there are some minor differences, feeding activities of the three species can be subdivided into the following three cyclic phases; Phase 1 characterized by gradual extension of TP and XP from the aperture, Phase 2 marked by an abrupt withdrawal of TP and XP toward the aperture to engulf captured prey, and Phase 3 during which entangled TP used for capturing prey are completely retracted into the aperture. These lines of evidence suggest that the shell aperture plays the same role of a feeding apparatus as does a mouth. Interestingly, XP of E. hexagonatum sometimes shows abnormal branching, fusion and separation, which is different from the spumellarian axoflagellum.

Kazuhiro Sugiyama, Rie S. Hori, Yoshitaka Kusunoki, and Atsushi Matsuoka "Pseudopodial features and feeding behavior of living nassellarians Eucyrtidium hexagonatum Haeckel, Pterocorys zancleus (Müler) and Dictyocodon prometheus Haeckel," Paleontological Research 12(3), 209-222, (1 September 2008). https://doi.org/10.2517/1342-8144-12.3.209
Received: 23 October 2000; Accepted: 1 February 2008; Published: 1 September 2008
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KEYWORDS
Dictyocodon prometheus
Eucyrtidium hexagonatum
feeding
light microscopy
living Nassellaria
pseudopodia
Pterocorys zancleus
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