Autotomy in a polychaete: Abscission zone at the base of the tentacular crown of Sabella penicillus

Kennedy, Bill; Kryvi, Harald

doi:10.1007/bf00310075

Cited by 10 publications

(9 citation statements)

References 12 publications

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“…Sabellids are very delicate and radiolar crowns are easily detached from the body. This process can occur deliberately, as has been documented in members of Fabrisabella Hartman, 1969, Jasmineira, Myxicola and Sabella Linnaeus, 1767(Berrill 1931Okada 1934;Kennedy & Kryvi 1980;Cochrane 2003;TovarHernández 2008), but also unintentionally, as a consequence of poor preservation or handling of the worms after collection. This often results in the separation of crown and body that may then not be reliably matched together, making the identification to species difficult or impossible.…”

Section: Discussionmentioning

confidence: 99%

A taxonomic guide to the fanworms (Sabellidae, Annelida) of Lizard Island, Great Barrier Reef, Australia, including new species and new records

Murray

2015

Zootaxa

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This comprehensive taxonomic work is the result of the study of fan worms (Sabellidae, Annelida) collected over the last 40 years from around the Lizard Island Archipelago, Great Barrier Reef, Australia. Some species described herein are commonly found in Lizard Island waters but had not previously been formally reported in the literature. Most species appear to be not particularly abundant, and few specimens have been collected despite the sampling effort in the area over this time period. After this study, the overall sabellid diversity of the archipelago has been greatly increased (by more than 650%). Before this revision, only four sabellid species had been recorded for Lizard Island, and in this paper we report 31 species, 13 of which belong to nominal species, six are formally described as new species (Euchone danieloi n. sp., Euchone glennoi n. sp., Jasmineira gustavoi n. sp., Megalomma jubata n. sp., Myxicola nana n. sp., and Paradialychone ambigua n. sp.), and the identity of 12 species is still unknown (those referred as cf. or sp.). Two species are newly recorded in Australia and two in Queensland. The invasive species Branchiomma bairdi is reported for the first time at Lizard Island. The genus Paradialychone is reported for Australia for the first time. Standardised descriptions, general photographs of live and/or preserved specimens and distribution data are provided for all species. New species descriptions are accompanied by detailed illustrations and exhaustive morphological information. A dichotomous key for sabellid identification is also included.

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Section: Discussionmentioning

confidence: 99%

A taxonomic guide to the fanworms (Sabellidae, Annelida) of Lizard Island, Great Barrier Reef, Australia, including new species and new records

Murray

2015

Zootaxa

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“…Indeed, the presence of such adaptations is a corollary of the 'utilitarian imperative' which makes it desirable for functional competence to be recovered as quickly as possible (Goss, 1969). Certainly there are features at many autotomy planes that minimise trauma and promote swift fluid compartment sealage, wound closure, and wound healing, all of which may be prerequisites of normal regeneration (Clark and Clark, 1965;Wake and Dresner, 1967;Kress, 1968;Sheppard and Bellairs, 1972;Wilkie, 1978a;Kennedy and Kryvi, 1980;McVean, 1973;Wilkie et al, 1990). This could explain in part the tendency for regeneration to be accomplished more quickly from the autotomy plane than from other levels (King, 1898;Needham, 1947;Jamison, 1964;Clark and Clark 1965;.…”

Section: Scope Of the Reviewmentioning

confidence: 99%

Autotomy as a prelude to regeneration in echinoderms

Wilkie

2001

Microscopy Res & Technique

124

139

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'Autotomy' refers to the adaptive detachment of animal body parts where this serves a defensive function, is achieved by an intrinsic mechanism, and is nervously mediated. With regard to each echinoderm class, this article itemises those structures that are autotomous, evaluates the extent to which autotomy precedes regeneration in natural populations, reviews current knowledge of the morphology of autotomy planes and mechanisms that effect fracture at autotomy, and comments on autotomy-related issues arising from studies of the cellular events of regeneration. Each autotomy plane can be regarded as an assemblage of breakage zones traversing the individual anatomical components of the autotomous structure. In any one autotomy plane some breakage zones are permanent sites of weakness that are fractured by external forces and some are potential sites of weakness that undergo a loss of tensile strength only at the time of autotomy. The latter occur predominantly in mutable collagenous structures, although there are a few examples of muscles that undergo an endogenous rupturing process. Available evidence indicates that autotomy is by far the commonest proximate cause of structural loss in echinoderms. Most echinoderm regeneration is therefore necessitated by autotomy and proceeds from the retained side of a fractured autotomy plane. Due to a lack of relevant research there is as yet little evidence for or against the presence of specific regeneration-promoting adaptations at autotomy planes, although it is argued that an autotomy plane designed primarily to effect rapid detachment would by itself increase regenerative efficiency.

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“…These studies have also shown that wound healing is initiated from a cut surface. A recent electron microscope study has shown, however, that a pre-established abscission zone exists at the base of the tentacular crown of the polychaete Sabellu penicillus, from which point the tentacular crown is detached by autotomy (Kennedy & Kryvi, 1980). Specialized epidermal cells, which demarcated the abscission zone, were not found in S .…”

Section: Discussionmentioning

confidence: 93%

“…penicillus. The capacity to autotomize tentacular branchial crowns is apparently widespread in polychaetes, but no histological studies of the tissues and mechanisms involved in this process have been reported (see Kennedy & Kryvi, 1980). The opercular filament of P. lumurckii is a specialized branchial filament which acts as a habitation tube plug and is, therefore, vulnerable to loss by predators.…”

Section: Discussionmentioning

confidence: 99%

Tissue abscission and wound healing in the operculum of Pomatoceros lamarckii Quatrefages (Polychaeta: Serpulidae)

Bubel

Thorp

1985

Journal of Zoology

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Following opercular amputation in Pomatoceros lamarckii Quatrefages, wound healing is initiated from a predetermined point on the peduncle. The events of abscission, cell migration and cuticle deposition during wound healing have been studied by light and electron microscopy. Abscission occurs at a predetermined point on the peduncle indicated by specialized epidermal cells, the easy break‐point cells (EBP). Following detachment of tissues distal to the EBP cells, the resultant wound is plugged by a knot of coelomocytes which provide a substratum over which epidermal cells migrate to seal and restore the epidermis. During their migration, the epidermal cells undergo differentiation and deposit a new cuticle. Cuticle formation is initiated by the deposition of a finely filamentous matrix. The fine filaments subsequently coalesce to form thicker fibrils which become aggregated into layers of orthogonally‐arranged fibril bundles. The mechanisms involved in abscission, cell migration and cuticle deposition during wound healing of the opercular filament are discussed.

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Autotomy in a polychaete: Abscission zone at the base of the tentacular crown of Sabella penicillus

Cited by 10 publications

References 12 publications

A taxonomic guide to the fanworms (Sabellidae, Annelida) of Lizard Island, Great Barrier Reef, Australia, including new species and new records

A taxonomic guide to the fanworms (Sabellidae, Annelida) of Lizard Island, Great Barrier Reef, Australia, including new species and new records

Autotomy as a prelude to regeneration in echinoderms

Tissue abscission and wound healing in the operculum of Pomatoceros lamarckii Quatrefages (Polychaeta: Serpulidae)

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