. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIFE HISTORY OF P. JUGOSVS 127 Table III Kinetid structure Structure or orientation Axoneme I Axoneme 2 Kinetosome 1 Kinetosome 2 Basal sphere Lateral sphere Connecting fiber Nuclear fiber Rhizoplast Rhizoplast microtubules: transverse Rhizoplast microtubules: parallel Right Left Anterior Posterior Ventral Dorsal Nucleus Abbreviation axl ax2 Rl R2 bs Is cf nf RZ rtm rpm R L A P V D n from numerous electron micrographs (Figs. 13-15), and labeled according to Table III is summarized diagram- matically in Figure 16. The standar
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. LIFE HISTORY OF P. JUGOSVS 127 Table III Kinetid structure Structure or orientation Axoneme I Axoneme 2 Kinetosome 1 Kinetosome 2 Basal sphere Lateral sphere Connecting fiber Nuclear fiber Rhizoplast Rhizoplast microtubules: transverse Rhizoplast microtubules: parallel Right Left Anterior Posterior Ventral Dorsal Nucleus Abbreviation axl ax2 Rl R2 bs Is cf nf RZ rtm rpm R L A P V D n from numerous electron micrographs (Figs. 13-15), and labeled according to Table III is summarized diagram- matically in Figure 16. The standard [9(2) + 0] kineto- somes (Fig. 13B), and [9(2) + 2] axonemes (Fig. 14) are present in this dikinetid that shows mirror image sym- metry. A microtubular rhizoplast containing both paral- lel and transverse tubules arises between the kinetosomes and runs posteriorly toward the nucleus (Figs. 13A, 14, 15). The parallel kinetosomes are underlain by a basal sphere connected to the nucleus; each possesses a pro- truding lateral sphere also connected to the nucleus by rhizoplast nuclear fibers (Kl/lsnf, K2/lsnf). The masti- gote in Figure 15 may either be extending or retracting its undulipodium. Because a large portion of degraded axonemal material is visible with cytoplasm at the distal extremity, resorption of the axoneme is more likely. A row of single microtubules (seen in cross section in Fig. 14 and tangential section in Fig. 15) originates from be- tween the kinetosomes and runs anteriorly and cortically along and past the nucleus. The sheet of microtubules presumably originating from rhizoplast transverse mi- crotubules (rtm, Fig. 16) and supporting the anterior end of the mastigote give the cell the conical appearance that prompted Darbyshire et al. (1976) to identify the "rostral ; The number of undulipodia, usually two as deter- mined by light microscopy, may vary greatly. While difficult to assess their precise positioning by transmis- sion electron micr
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