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English: Phylogenetic relationships within the Acoela. A - Aberrantospermata, B - Crucimusculata, C - Prosopharyngida, D - Bursalia, E - Acoela. 1. Multiciliated epidermis, ciliary rootlet system, frontal organ, basiepidermal nervous system with ring-shaped brain. 2. Statocyst with two lithocytes (statoliths) and many parietal cells, sperm with cork screw-like morphology. 3. Statocyst with one lithocyte (statolith) and two parietal cells, brain sunk below body wall, lateral fibers at knee of rostral rootlet, biflagellated sperm; digestive system becomes depolarized. 4. Position of mouth at the posterior end. 5. Specialized parenchymal tissue for reception, storage, and digestion of sperm (seminal bursa). 6. Subterminal pharynx at anterior end. 7. Ventral crossover muscles and highly branched wrapping cells. 8. Cytoplasmic microtubules of sperm partially lose contact with membrane and change position toward the center of the cell. 9. Cytoplasmic microtubules of sperm change position toward the center of the cell, stacked bursal nozzles with matrix and gland cells. 10. Central microtubules in axonemes of sperm reduced to allow movement in more than one plane.
Русский: Филогения внутри Acoela. A - Aberrantospermata, B - Crucimusculata, C - Prosopharyngida, D - Bursalia, E - Acoela. 1. Многоресничные клетки эпидермиса, система ресничных корешков, фронтальный орган, базоэпидермальная нервная система с кольцевидным мозгом. 2. Статоцист с двумя статолитами (литоцитами) и множеством париетальных клеток, сперматозоиды штопорообразные. 3. Статоцист с одним статолитом (литоцитом) и двумя париетальными клетками, латеральные волокна у рострального корешка, двужгутиковые сперматозоиды. 4. Рот на переднем конце тела. 5. Специальная паренхиматозная структура для приёма, хранения и переваривания спермы (семенная бурса). 6. Субтерминальная глотка на переднем конце тела. 7. Вентральные поперечные мышцы и широко разветвлённые окутывающие клетки. 8. У сперматозоидов цитоплазматические микротрубочки частично утрачивают контакт с мембраной и смещаются к центру клетки. 9. У сперматозоидов цитоплазматические микротрубочки смещаются к центру клетки, имеются бурсальные носики (англ. nozzles) с матриксом и железистыми клетками. 10. Центральные микротрубочки в аксонемах жгутиков сперматозоидов редуцированы, что позволяет жгутику двигаться более чем в одной плоскости. |
| Date | |
| Source | Based on fig. 7 [1] |
| Author | Minina |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 19:27, 20 June 2018 | | 893 × 732 (47 KB) | Minina (talk | contribs) | {{Information |description ={{en|1=Phylogenetic relationships within the Acoela. A - Aberrantospermata, B - Crucimusculata, C - Prosopharyngida, D - Bursalia, E - Acoela. 1. Multiciliated epidermis, ciliary rootlet system, frontal organ, basiepidermal nervous system with ring-shaped brain. 2. Statocyst with two lithocytes (statoliths) and many parietal cells, sperm with cork screw-like morphology. 3. Statocyst with one lithocyte (statolith) and two parietal cells, brain sunk below body wall... |
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