Regeneration in the Polychæte Clymenella Torquata

Sayles, Leonard P.

doi:10.2307/1537301

Cited by 12 publications

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“…The evidence that most of the posterior regenerations occurring in these maldanids are the result of spontaneous autotomies, and not accidents, is persuasive, and is outlined briefly below. More detailed information is recorded elsewhere (Pilgrim, 1960;Sayles, 1932Sayles, , 1934Sayles, ,1936Sayles, and 1943. (i) The body wall at each intersegmental boundary, with the exception of the posterior boundaries of the head and of the last true segment in both species, and also of the penultimate segment in Euclymene, shows a specialized structure which would ensure breakage at these levels only, under any condition of longitudinal strain, such as could easily be exerted by the worm itself within its tube, or as a result of a powerful constriction in the vicinity (see below).…”

Section: The Phagocytic Coelomocytesmentioning

confidence: 99%

“…(iv) Regenerations from other levels have been observed, but these are relatively rare. Sayles (1932Sayles ( , 1934 reports 4.3% (out of 530 worms) of anterior regenerations, and 50% (out of 513 worms) of posterior regenerations in Clymenella. Presuming that the 4.3 % is representative of pure accident rate, and allowing that the posterior end, being usually uppermost in the tube, is probably more accident-prone, the 45.7 % difference still seems too much to attribute entirely to accident in these well-protected worms.…”

Section: The Phagocytic Coelomocytesmentioning

confidence: 99%

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The anatomy and histology of the blood system of the maldanid polychaetes Clymenella torquata and Euclymene oerstedi

Pilgrim¹

1966

Journal of Zoology

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The nervous system of the maldanid polychaetes Clymenella torquata (Leidy) and Euclymene oerstedi (Claparede) (= Caesicirrus neglectus [Arwidsson, '1 1-'121) retains its primitive association with the epidermis. I t shows only slight metamerism in the presence of larger collections of neurones opposite the parapodia and of larger nerves a t the segmental boundaries. Multicellular giant fibers are present in the ventral nerve cord; giant neurones which show a characteristic pattern of distribution in each species are also present. The cerebral ganglia supply nerves to the prostomial wall, nuchal grooves and the wall of the buccal cavity, and a pair of large nerves from the circumpharyngeal connectives also appear to join the buccal system. The organs of special sense are the elongated prostomial nuchal grooves, and prostomial ocelli in Euclymene but not in Clymenella. Statocysts are absent.

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Section: The Phagocytic Coelomocytesmentioning

confidence: 99%

Section: The Phagocytic Coelomocytesmentioning

confidence: 99%

The anatomy and histology of the blood system of the maldanid polychaetes Clymenella torquata and Euclymene oerstedi

Pilgrim¹

1966

Journal of Zoology

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Simultaneous anterior and posterior regeneration and other growth phenomena in Maldanid polychaetes

Moment

1951

J. Exp. Zool.

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The anatomy and histology of the nervous system and excretory system of the maldanid polychaetes Clymenella torquata and Euclymene oestedi

Pilgrim

1978

Journal of Morphology

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The nervous system of the maldanid polychaetes Clymenella torquata (Leidy) and Euclymene oerstedi (Claparede) (= Caesicirrus neglectus [Arwidsson, '11‐'12]) retains its primitive association with the epidermis. It shows only slight metamerism in the presence of larger collections of neurones opposite the parapodia and of larger nerves at the segmental boundaries. Multicellular giant fibers are present in the ventral nerve cord; giant neurones which show a characteristic pattern of distribution in each species are also present. The cerebral ganglia supply nerves to the prostomial wall, nuchal grooves and the wall of the buccal cavity, and a pair of large nerves from the circumpharyngeal connectives also appear to join the buccal system. The organs of special sense are the elongated prostomial nuchal grooves, and prostomial ocelli in Euclymene but not in Clymenella. Statocysts are absent. Four pairs of nephromixia are present. They lie in the aseptate anterior trunk, in chaetigers 5–9 of Clymenella, and 6–10 of Euclymene. The nephridiopores lie at the ventral ends of the neuropodia of chaetigers 6–9 and 7–10, respectively. Each nephromixium consists of coelomostome, tubule and contractile bladder. The wall of the tubule and bladder consists of both excretory and ciliated cells. Most of the cytoplasm of the latter forms a bounding layer at the outer surface. The cytoplasm of the excretory cells contains lipid material and appears to synthesize lipofuscin. The tips of the excretory cells swell, fill with granules, and break off in the form of vesicles which are periodically expelled in clouds from the nephridiopores. Glycogen is present, especially in the ciliated cells of the tubule and coelomostome. Granules of a lipoid nature accumulate in (or between) cells of the nephridia, epidermis, and some regions of the gut, and may be excretory. Lipid granules also appear to be synthesized by coelomocytes which eventually end up in masses in the ventrolateral coelomic cavities of the tail. The nephridia act as gonoducts, but show no seasonal variation in either size or histological structure.

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Regeneration in the Polychæte Clymenella Torquata

Cited by 12 publications

References 0 publications

The anatomy and histology of the blood system of the maldanid polychaetes Clymenella torquata and Euclymene oerstedi

The anatomy and histology of the blood system of the maldanid polychaetes Clymenella torquata and Euclymene oerstedi

Simultaneous anterior and posterior regeneration and other growth phenomena in Maldanid polychaetes

The anatomy and histology of the nervous system and excretory system of the maldanid polychaetes Clymenella torquata and Euclymene oestedi

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