A new limnic species of Macrostomum (Platyhelminthes: Macrostomida) from Argentina and its muscle arrangement labeled with phalloidin

Adami, Mariana Laura; Damborenea, María Cristina; Ronderos, Jorge Rafael

doi:10.1016/j.jcz.2011.08.006

Cited by 15 publications

(26 citation statements)

References 16 publications

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“…Several studies analyzed the number of fibers in the body wall. For instance, Ladurner et al () reported that mature M. lignano individuals had up to 50 longitudinal fibers, which was confirmed by studies of the other species in the genus (Rieger et al, ; Adami et al, ). The total number of fibers in the species analyzed ranged from 80 to 100, a number clearly higher than those reported in previous observations.…”

Section: Discussionmentioning

confidence: 74%

“…The genus Macrostomum O. Schmidt, 1848, has approximately 160 known species (Tyler et al, −2016), with only 19 recorded for South America. Of the total, only three freshwater and brackish species have been mentioned for Argentina ( Macrostomum velastylum Brusa, ; M. puntapiedrensis Brusa, ; M. platensis Adami et al, ). Furthermore, presence of specimens similar to M. vejdovskyi Ferguson, 1940 and M. viride van Beneden, 1870 (Brusa, ) has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Muscular pattern in three species of Macrostomum (platyhelminthes, macrostomorpha)

Adami

Brusa

Ronderos

et al. 2016

Journal of Morphology

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Previous studies demonstrated complex architecture of the muscular system of Macrostomum species, especially in the rostrum area and the pharynx. However, little is known about the differences in muscular pattern between species of the genus. This study examines and compares the muscular systems of specimens belonging to three freshwater Macrostomum species (M. quiritium, M. tuba and M. velastylum), labeled with phalloidin-rhodamine and studied by confocal microscopy. Our results agree with the previous descriptions, confirming that the muscular patterns for the body wall, rostrum area, pharynx and caudal region differ among species. The muscles of the body wall follow the typical architecture, but the number of fibers in the species analyzed varies between dorsal and ventral surfaces, ranging from 80 to 100 fibers, this record being higher than previous observations. The arrangement of the fibers in the rostrum is complex, especially in the brain area. Macrostomum tuba and M. quiritium have a set of two muscles crossing at brain level and forming an "X," which is not evident in M. velastylum. We identified five different sets of fibers associated to the pharynx and mouth at ventral, medium and deep levels. These different sets are present in all three species studied. The caudal plate in M. tuba has an additional layer of diagonal fibers in the body wall, which is not evident in the other two species. The muscles of the reproductive system are independent of the body wall musculature in the species analyzed, but connected to the intestinal wall by specific fibers that may serve as an anchor. J. Morphol. 278:264-282, 2017. © 2016 Wiley Periodicals,Inc.

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Section: Discussionmentioning

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Muscular pattern in three species of Macrostomum (platyhelminthes, macrostomorpha)

Adami

Brusa

Ronderos

et al. 2016

Journal of Morphology

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“…In addition to these putative ancestral features of the muscular system, the dorsoventral musculature of M. cirriferum might represent a plesiomorphic condition dating back to the last common ancestor of Lophotrochozoa. Comparable inner musculature running from dorsal or lateral regions towards ventral is also known from other annelid subgroups, including the sedentary polychaetes, and from some mollusks and flatworms (Sawyer,1986; Skierczynski et al,1996; Haszprunar and Wanninger,2000; Wanninger and Haszprunar,2002a,b; Tzetlin and Filippova,2005; Purschke and Müller,2006; Wanninger,2009; Adami et al,2012). Notably, distinct dorsoventral muscle fibers are present in leeches too.…”

Section: Discussionmentioning

confidence: 92%

Myoanatomy of Myzostoma cirriferum (Annelida, Myzostomida): Implications for the evolution of the myzostomid body plan

Helm

Weigert

Mayer

et al. 2012

Journal of Morphology

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Studies of rare genomic marker systems suggest that Myzostomida are a subgroup of Annelida and phylogenomic analyses indicate an early divergence of this taxon within annelids. However, adult myzostomids show a highly specialized body plan, which lacks typical annelid features, such as external body annulation, coelomic cavities with metanephridia, and segmental ganglia of the nervous system. The putative loss of these features might be due to the parasitic/symbiotic lifestyle of myzostomids associated with echinoderms. In contrast, the larval anatomy and adult locomotory system resemble those of annelids. To clarify whether the myoanatomy of myzostomids reflects their relationship to annelids, we analyzed the distribution of f-actin, a common component of muscle fibers, in specimens of Myzostoma cirriferum using phalloidin-rhodamine labeling in conjunction with confocal laser-scanning microscopy. Our data reveal that the musculature of the myzostomid body comprises an outer circular layer, an inner longitudinal layer, numerous dorsoventral muscles, and prominent muscles of the parapodial complex. These features correspond well with the common organization of the muscular system in Annelida. In contrast to other annelids, however, several elements of the muscular system in M. cirriferum, including the musculature of the body wall, and the parapodial flexor muscles, exhibit radial symmetry overlaying a bilateral body plan. These findings are in line with the annelid affinity of myzostomids and suggest that the apparent partial radial symmetry of M. cirriferum arose secondarily in this species. Based on our data, we provide a scenario on the rearrangements of muscle fibers that might have taken place in the lineage leading to this species.

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“…The diversity and distribution of microturbellarians are poorly known in the Neotropical region, and most knowledge is restricted to taxonomic works (Noreña et al 2004, Brusa 2006, Damborenea et al 2007, Brusa et al 2008, Adami et al 2012, Martínez-Aquino et al 2014, Braccini et al 2016. In the present work, we report new records of 6 microturbellarian species, 3 of them previously reported only from their type localities.…”

Section: Discussionmentioning

confidence: 46%

“…The distribution of microturbellarians in the Neotropical region is mainly known from taxonomic studies, most of which were done in Argentina and Brazil (e.g. Marcus 1945a, b, 1946, 1948, 1950, 1952, Noreña et al 2004, Brusa 2006, Damborenea et al 2007, Brusa et al 2008, Adami et al 2012, Martínez-Aquino et al 2014, Braccini et al 2016. In Brazil, the distribution of microturbellarian species is mainly known from taxonomical works done by Marcus (e.g.…”

Section: Introductionmentioning

confidence: 99%

Six freshwater microturbellarian species (Platyhelminthes) in permanent wetlands of the Coastal Plain of southern Brazil: new records, abundance, and distribution

Braccini¹,

Brusa²,

Leal-Zanchet³

2017

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551

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Microturbellarians occur in a wide range of ecosystems, but their diversity and distribution are largely unknown. In this work, we report on the morphology, abundance, and distribution of 6 species of microturbellarians, namely Baicalellia evelinae, Catenula evelinae, C. leuca, C. turgida, Gieysztoria chiqchi, and Stenostomum hemisphericum. We provide photographs and schematic drawings of the specimens in vivo. Three of them were known only for their type localities. Most species showed low to moderate abundance and were found in a single wetland in this study. Gieysztoria chiqchi is reported from Brazil for the first time. All records extend the ranges of the species at least 800 km to the southeast.

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A new limnic species of Macrostomum (Platyhelminthes: Macrostomida) from Argentina and its muscle arrangement labeled with phalloidin

Cited by 15 publications

References 16 publications

Muscular pattern in three species of Macrostomum (platyhelminthes, macrostomorpha)

Muscular pattern in three species of Macrostomum (platyhelminthes, macrostomorpha)

Myoanatomy of Myzostoma cirriferum (Annelida, Myzostomida): Implications for the evolution of the myzostomid body plan

Six freshwater microturbellarian species (Platyhelminthes) in permanent wetlands of the Coastal Plain of southern Brazil: new records, abundance, and distribution

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A new limnic species of Macrostomum (Platyhelminthes: Macrostomida) from Argentina and its muscle arrangement labeled with phalloidin

Cited by 15 publications

References 16 publications

Muscular pattern in three species of Macrostomum (platyhelminthes, macrostomorpha)

Muscular pattern in three species of Macrostomum (platyhelminthes, macrostomorpha)

Myoanatomy of Myzostoma cirriferum (Annelida, Myzostomida): Implications for the evolution of the myzostomid body plan

Six freshwater microturbellarian species (Platyhelminthes) in&nbsp;permanent wetlands of the Coastal Plain of southern Brazil: new&nbsp;records, abundance, and distribution

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Product

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Six freshwater microturbellarian species (Platyhelminthes) in permanent wetlands of the Coastal Plain of southern Brazil: new records, abundance, and distribution