Three-dimensional reconstruction of the F-actin musculature of Dorvillea kastjani (Dorvilleidae, Polychaeta) by means of phalloidin-labelling and cLSM

Filippova, Anna V.; Purschke, Günter; Tzetlin, Alexander B.; Müller, Mónika

doi:10.3989/scimar.2006.70s3293

Cited by 19 publications

(24 citation statements)

References 14 publications

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“…The parapodial muscles in O. diadema are almost identical to those described for Dorvillea kastjani (Dorvilleidae) [31]. Interestingly, several investigations of polychaete parapodial muscles indicate that parapodial muscles of greatest complexity are found in species that do not use their appendages for locomotion [33,52].…”

Section: Discussionmentioning

confidence: 79%

Muscle formation during embryogenesis of the polychaete Ophryotrocha diadema (Dorvilleidae) – new insights into annelid muscle patterns

2008

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Background: The standard textbook information that annelid musculature consists of oligochaete-like outer circular and inner longitudinal muscle-layers has recently been called into question by observations of a variety of complex muscle systems in numerous polychaete taxa. To clarify the ancestral muscle arrangement in this taxon, we compared myogenetic patterns during embryogenesis of Ophryotrocha diadema with available data on oligochaete and polychaete myogenesis. This work addresses the conflicting views on the ground pattern of annelids, and adds to our knowledge of the evolution of lophotrochozoan taxa.

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Section: Discussionmentioning

confidence: 79%

Muscle formation during embryogenesis of the polychaete Ophryotrocha diadema (Dorvilleidae) – new insights into annelid muscle patterns

2008

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“…Müller, unpubl. data; Filippova et al 2006; Purschke & Müller 2006; Bergter et al 2008). In some dorvilleids, however, the fibers accumulate ventrally into seven paired bundles.…”

Section: Discussionmentioning

confidence: 97%

“…This article is part of a series of studies re‐investigating the architecture of the annelid muscular system. Interest in this system was revitalized by the finding that a number of polychaete species lack an outer layer of circular fibers (e.g., Filippova et al 2005, 2006; Tzetlin & Filippova 2005; Müller & Worsaae 2006; Purschke & Müller 2006; Rüchel & Müller 2007). These observations are in conflict with the generally supposed ground pattern of annelid musculature, which is considered to consist of an outer layer of circular and an inner layer of longitudinal muscles (Lanzavecchia et al 1988; Gardiner 1992).…”

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confidence: 99%

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Musculature in polychaetes: comparison of Myrianida prolifera (Syllidae) and Sphaerodoropsis sp. (Sphaerodoridae)

Filippova¹,

Purschke²,

Tzetlin³

et al. 2010

Invertebrate Biology

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Abstract. The relationship of the polychaete taxa Syllidae and Sphaerodoridae within Phyllodocida is still unresolved: phylogenetic analyses either show them as sister groups or more widely separated. The present article aims to provide information about the structure of the muscular system that could be essential for understanding their relationship. A crucial point is whether the body wall contains circular muscles, which has recently been shown to be absent in more taxa than previously known. The F‐actin filaments in members of Myrianida prolifera (Syllidae) and Sphaerodoropsis sp. (Sphaerodoridae) were labeled with phalloidin and their three‐dimensional relationships reconstructed by means of confocal laser scanning microscopy. Among the noteworthy differences that emerged between the species are (1) members of M. prolifera possess four, those of Sphaerodoropsis sp. eight, longitudinal muscle strands; (2) the body wall in M. prolifera contains transverse fibers in a typical, supralongitudinal position, while in Sphaerodoropsis sp., corresponding fibers lie beneath the longitudinal strands; (3) pro‐ and peristomium in M. prolifera have no distinct F‐actin fibers, while five longitudinal pairs and three single transverse muscular fibers shape the anterior end in Sphaerodoropsis sp.; (4) the proventricle of M. prolifera comprises primarily radial muscle fibers arranged in distinct rows, while in Sphaerodoropsis sp. the axial proboscis consists of longitudinal and circular fibers and radial fibers are lacking; (5) in M. prolifera, the proximal and distal sections of the two anteriormost pairs of dorsal cirri possess longitudinal myofilaments, which are separate from the body wall musculature; by contrast, all appendages in Sphaerodoropsis sp. do not; (6) both species have bracing muscles: in M. prolifera they are positioned above the longitudinal fibers, whereas in Sphaerodoropsis sp. they are uniquely positioned between longitudinal and sublongitudinal transverse fibers. These results do not support a sister‐group relationship of Syllidae and Sphaerodoridae. In addition, Sphaerodoropsis sp. is yet another example in the list of polychaetes lacking typical circular muscles in the body wall.

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“…Previously it has been assumed that palps of all errant taxa lack musculature, coelomic cavities and blood vessels . But analyses of Syllidae and Dorvilleidae as well as of Nerillidae revealed the presence of well-developed musculature in the palps of errant polychaetes (Filippova et al, 2006(Filippova et al, , 2010Müller and Worsaae, 2006). A highly developed muscular system is also present in, e.g., the palps of adults in Magelonidae (see Filippova et al, 2005), which are placed in the basal part of the annelid tree in a recent phylogenomic analysis .…”

Section: Appendages Of the Prostomium -Antennae And Palpsmentioning

confidence: 99%

Systematics, evolution and phylogeny of Annelida – a morphological perspective

Purschke¹,

Bleidorn²,

Struck³

2014

Mem. Mus. Vic.

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Purschke, G., Bleidorn, C. and Struck, T. 2014. Systematics, evolution and phylogeny of Annelida -a morphological perspective . Memoirs of Museum Victoria 71: 247-269.Annelida, traditionally divided into Polychaeta and Clitellata, is an evolutionary ancient and ecologically important group today usually considered to be monophyletic. However, there is a long debate regarding the in-group relationships as well as the direction of evolutionary changes within the group. This debate is correlated to the extraordinary evolutionary diversity of this group. Although annelids may generally be characterised as organisms with multiple repetitions of identically organised segments and usually bearing certain other characters such as a collagenous cuticle, chitinous chaetae or nuchal organs, none of these are present in every subgroup. This is even true for the annelid key character, segmentation. The first morphology-based cladistic analyses of polychaetes showed Polychaeta and Clitellata as sister groups. The former were divided into Scolecida and Palpata comprising Aciculata and Canalipalpata. This systematisation definitely replaced the old concept of dividing polychaetes into Errantia and Sedentaria, whereas the group Archiannelida had already been abandoned. The main critics came from a contradicting hypothesis relying on scenario based on plausibility considerations regarding Clitellata as highly derived annelids nesting within polychaetes and rendering the latter paraphyletic. In this hypothesis the absences of typical polychaete characters were regarded as losses rather than as primary absences. However, to date attempts to unambiguously identify the sister group of Clitellata on the basis of morphological characters have failed. Thus, two hypotheses on the last common annelid ancestor have been put forward either being an oligochaete-like burrowing animal or a parapodia-bearing epibenthic worm. These attempts to understand the major transitions in annelid evolution are reviewed and discussed in the light of new morphological evidence such as photoreceptor cell and eye evolution as well as the evolution of the nervous system and musculature. We also discuss the plausibility of these scenarios with regard to recent advances in molecular phylogenetic analyses.

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Three-dimensional reconstruction of the F-actin musculature of Dorvillea kastjani (Dorvilleidae, Polychaeta) by means of phalloidin-labelling and cLSM

Cited by 19 publications

References 14 publications

Muscle formation during embryogenesis of the polychaete Ophryotrocha diadema (Dorvilleidae) – new insights into annelid muscle patterns

Muscle formation during embryogenesis of the polychaete Ophryotrocha diadema (Dorvilleidae) – new insights into annelid muscle patterns

Musculature in polychaetes: comparison of Myrianida prolifera (Syllidae) and Sphaerodoropsis sp. (Sphaerodoridae)

Systematics, evolution and phylogeny of Annelida – a morphological perspective

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