Phylum Gastrotricha

Balsamo, Maria; D'hondt, J.-L.; Grilli, Paolo

doi:10.1016/b978-0-12-385024-9.00007-1

Cited by 11 publications

(23 citation statements)

References 13 publications

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“…The necessity for a re-examination was caused by the shallow description by Brunson (1950) , who only briefly reported and illustrated a few morphological features of the new species. This need was further noted by Balsamo et al (2014) , suggesting a misinterpretation of the insertion positions of the lateral spines. In the redescription of the species, the groups of spines are coded according to Kisielewski (1991) .…”

Section: Methodsmentioning

confidence: 97%

“…As previously mentioned, the description of some morphological characters of H. ooëides were misinterpreted by Brunson (1950) and incorrectly replicated by Balsamo et al (2014) and Minowa and Garraffoni (2017) . We address this issue by correcting the taxonomic key Haltidytes in order to correct previous misinterpretations.…”

Section: Taxonomic Accountmentioning

confidence: 99%

“…While most gastrotrichs are epibenthic, periphytic, or interstitial, some species belonging to the family Dasydytidae Daday, 1905 present a semi-pelagic lifestyle ( Kieneke et al 2008 , Balsamo et al 2014 , Kånneby and Todaro 2015 ). Seven genera are currently assigned to Dasydytidae , including the genus Haltidytes Remane, 1936 recently found as monophyletic ( Minowa and Garraffoni 2017 ).…”

Section: Introductionmentioning

confidence: 99%

“…Due to small size and fragile bodies, fixed specimens of gastrotrichs usually have their diagnostic morphological characters deteriorated after fixation (e.g. Balsamo et al 2014 , Kånneby 2016 , Garraffoni and Freitas 2017 ). It is interesting to highlight that we also found the possible type specimen of Stylochaeta scirtetica Brunson, 1950 (USNM W 26870), but in this case, the material is in a poor condition and could not be used for a reanalysis.…”

Section: Introductionmentioning

confidence: 99%

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Redescription of the dasydytid gastrotrich Haltidytes ooëides (Brunson, 1950) based on type material

Minowa¹,

Garraffoni²

2018

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The semi-pelagic gastrotrich species Haltidytesooëides (Brunson, 1950) is redescribed based on original type material deposited at the Smithsonian National Museum of Natural History. Herein we present a new diagnosis and figures of the species, detailing the insertion position of the lateral spines, misinterpreted in the original description. Furthermore, we reassess the taxonomic key for the genus Haltidytes Remane, 1936 based on our new findings.

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Section: Methodsmentioning

confidence: 97%

Section: Taxonomic Accountmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Redescription of the dasydytid gastrotrich Haltidytes ooëides (Brunson, 1950) based on type material

Minowa¹,

Garraffoni²

2018

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“…A general key to gastrotrich families and genera was recently published by Todaro et al (2019). Keys to the freshwater gastrotrich fauna also exist (see Balsamo et al, 2014 for a references' summary), but they are generally limited to selected taxa or to limited geographic ranges such as the Neotropics (Garraffoni & Araújo, 2010), the Nearctic (Kånneby, 2016), and the Palearctic (Balsamo et al, 2019). The Gastrotricha Portal (http:// www.gastrotricha.unimore.it) and the World Register of Marine Species (WoRMS, 2020a) contains lists of marine and freshwater species, but does not provide identification keys.…”

Section: Pitfallsmentioning

confidence: 99%

The curious and neglected soft-bodied meiofauna: Rouphozoa (Gastrotricha and Platyhelminthes)

et al. 2020

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First ultrastructural description of an apomictic opsiblastic egg in freshwater Gastrotricha

Araujo,

King‐Trudeau,

VanDyke

et al. 2023

Journal of Morphology

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Freshwater gastrotrichs have a biphasic lifecycle that reputedly involves the production of three types of eggs: apomictic and fast hatching (tachyblastic ova), apomictic and delayed hatching (opsiblastic ova), and plaque‐bearing eggs (potentially derived from mixis). While some details of oogenesis and eggshell structure are known for tachyblastic ova, there are few details on other egg types. Here, we provide the first ultrastructural description of the oviposited opsiblastic eggs of the freshwater gastrotrich, Lepidodermella squamata. Scanning electron microscopy revealed the eggshell surface to be ornamented with long flattened pillar‐like structures centered on polygonal plates that are pitted along their periphery. Transmission electron microscopy showed the pits to lead to a vast labyrinth of tubular spaces and larger cavities throughout the thick apical layer of the shell. The basal layer of the shell is amorphous and connected to a network of fine fibers that traverse an extra‐oocyte space and forms a protective sheet around the uncleaved oocyte. The uncleaved oocyte has a dense layer of peripheral ooplasm surrounding a core of organelles including mitochondria, membrane‐bound secretion granules, endoplasmic reticulum, and a single nucleus in a granular, ribosome‐rich cytoplasm. Secretion granules are the most abundant organelles and presumably contain lipid‐rich yolk that will be used as energy for delayed cleavage, thus functioning in temporal dispersal. These data are compared to the fine structure of invertebrate resting eggs across the phylogenetic spectrum to determine the novelty of opsiblastic egg structure in L. squamata.

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Phylum Gastrotricha

Cited by 11 publications

References 13 publications

Redescription of the dasydytid gastrotrich Haltidytes ooëides (Brunson, 1950) based on type material

Redescription of the dasydytid gastrotrich Haltidytes ooëides (Brunson, 1950) based on type material

The curious and neglected soft-bodied meiofauna: Rouphozoa (Gastrotricha and Platyhelminthes)

First ultrastructural description of an apomictic opsiblastic egg in freshwater Gastrotricha

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