1,721,009 research outputs found
New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
No full textCurini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca, Norenburg, Jon L. (2020): New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama. Zootaxa 4881 (3): 482-498, DOI: 10.11646/zootaxa.4881.3.
New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
No full textCurini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca, Norenburg, Jon L. (2020): New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama. Zootaxa 4881 (3): 482-498, DOI: https://doi.org/10.11646/zootaxa.4881.3.
FIGURE 3. Duplominona hystricina n in New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
No full textFIGURE 3. Duplominona hystricina n. sp. (A) Habitus of a living animal; see Fig. 2 A for interpretation of anatomical features. (B) Reconstruction of the cirrus. (C) Spine morphology. (D, E) Micrographs of cirri. (F) Reconstruction of the genital areas from sagittal sections. (G) Stylet of the accessory organ. (Scale bars: B, C = 5 μm; D, E, G = 10 μm).Published as part of Curini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca & Norenburg, Jon L., 2020, New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama, pp. 482-498 in Zootaxa 4881 (3) on page 486, DOI: 10.11646/zootaxa.4881.3.3, http://zenodo.org/record/428389
FIGURE 7. Duplominona veracruzensis n in New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
No full textFIGURE 7. Duplominona veracruzensis n. sp. (A) Habitus of a living animal; see Fig. 2 A for interpretation of anatomical features. (B) General topography of the genital organs from a living animal. (C) Reconstruction of the cirrus. (D) Spine morphology. (E, F) Micrograph of the cirrus (Scale bars: C, E, F = 10 μm; D = 5 μm).Published as part of Curini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca & Norenburg, Jon L., 2020, New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama, pp. 482-498 in Zootaxa 4881 (3) on page 492, DOI: 10.11646/zootaxa.4881.3.3, http://zenodo.org/record/428389
FIGURE 7. Duplominona veracruzensis n in New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
No full textFIGURE 7. Duplominona veracruzensis n. sp. (A) Habitus of a living animal; see Fig. 2 A for interpretation of anatomical features. (B) General topography of the genital organs from a living animal. (C) Reconstruction of the cirrus. (D) Spine morphology. (E, F) Micrograph of the cirrus (Scale bars: C, E, F = 10 μm; D = 5 μm).Published as part of Curini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca & Norenburg, Jon L., 2020, New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama, pp. 482-498 in Zootaxa 4881 (3) on page 492, DOI: 10.11646/zootaxa.4881.3.3, http://zenodo.org/record/428389
FIGURE 3. Duplominona hystricina n in New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
No full textFIGURE 3. Duplominona hystricina n. sp. (A) Habitus of a living animal; see Fig. 2 A for interpretation of anatomical features. (B) Reconstruction of the cirrus. (C) Spine morphology. (D, E) Micrographs of cirri. (F) Reconstruction of the genital areas from sagittal sections. (G) Stylet of the accessory organ. (Scale bars: B, C = 5 μm; D, E, G = 10 μm).Published as part of Curini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca & Norenburg, Jon L., 2020, New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama, pp. 482-498 in Zootaxa 4881 (3) on page 486, DOI: 10.11646/zootaxa.4881.3.3, http://zenodo.org/record/428389
Confocal Laser Scanning Microscopy Applied to a New Species Helps Understand the Functioning of the Reproductive Apparatus in Stylet-Bearing Urodasys (Gastrotricha: Macrodasyida)
Full text linkGastrotrichs are highly diverse and abundant in all aquatic ecosystems; however, they are often overlooked. During a biodiversity survey in Sardinia (Italy), a new species of gastrotrich herein described was discovered. Specimens of Urodasys bifidostylis sp. nov. were found in sandy sediments from two submarine caves. Using an integrative approach of traditional light (DIC) and high-resolution (CLSM) microscopies, we herein reveal, for the first time, the fine structure and function of the reproductive organ in an Urodasys representative. This is particularly relevant considering the complex reproductive organs and strategies of this group. Results allow comparisons between the reproductive apparatus and sperm transfer modalities in Urodasys and the closely related genus Macrodasys. One similarity is that both groups transfer male gametes in packets, suggesting the production of spermatophores to be a common phenomenon in Gastrotricha. Unique to Urodasys is the ability of multiple and consecutive copulations and sperm transfers and, differently than Macrodasys, the transfer of sperms unlikely occurs simultaneously between the two hermaphroditic partners. These findings provide new insights into the reproductive strategies of Urodasys and are expected to advance future studies on the evolution of reproductive strategies and the rise of interspecific reproductive barriers in interstitial meiofauna
FIGURE 4. Duplominona hyperhystricina n in New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
No full textFIGURE 4. Duplominona hyperhystricina n. sp. (A) Habitus of a living animal; see Fig. 2 A for interpretation of anatomical features. (B) Reconstruction of the cirrus. (C, G) Micrographs of living animals. (D, E, H) Micrographs of cirri. (F) Spine morphology. (I) Micrograph of a metaphasic plate (J) Reconstruction of the genital areas from sagittal sections. (Scale bars: B, D–F, H = 10 μm; I = 5 μm; C = 250 μm; G = 50 μm).Published as part of Curini-Galletti, Marco, Carcupino, Marcella, Stocchino, Giacinta A., Leasi, Francesca & Norenburg, Jon L., 2020, New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama, pp. 482-498 in Zootaxa 4881 (3) on page 488, DOI: 10.11646/zootaxa.4881.3.3, http://zenodo.org/record/428389
Geographical, ecological, and genetic drivers of gut microbial diversity in native and invasive minnows (Leuciscidae: Cyprinella)
No full textData Availability Statement: Raw sequences of 16S and 18S rRNA genes have been deposited in the NCBI SRA (Sequence Read Archive) database and are accessible in BioProject PRJNA1128422 (https://www.ncbi.nlm.nih.gov/sra/PRJNA1128422). Mitochondrial cytochrome b gene sequences have been deposited in GenBank under accession numbers PQ030722–PQ03080. All data files and scripts used for the analyses can be found here: https://github.com/willhr99/Cyprinella.git.The gut microbiome is important for many physiological processes that are critical in the adaptation of an animal to its environment. Conversely, abrupt ecological changes, as in the colonisation of a new territory, may also influence the microbiome. Therefore, anthropogenic introductions of invasive species offer a natural model in which to study these relationships. We compared the gut microbiomes (16S rRNA gene) of four freshwater fish species of the genus Cyprinella, including both native and introduced populations of the prolific invader C. lutrensis, to investigate if differences in their diversity and structure are determined by their host or depend more on the ecology and geographical location where they occur. Our results suggest that at this taxonomic level, the external environment of the fish is the strongest corollary of microbial diversity and community composition of the gut, followed to a lesser extent by species identity and genetic factors. Our findings emphasise the dynamic nature of the minnow gut microbiome, with high individual variation and rapid changes over time. We also found that new invasions may reduce the invader's gut microbiome alpha diversity while not conferring any clear distinction compared with cohabiting native species. This research addresses the perennial question of whether nature or nurture plays a greater role in shaping the gut microbiome, revealing the intricate interplay of factors and scales involved.W.H.-R. and this work were funded by a grant from the University of Tennessee at Chattanooga Center of Excellence in Applied Computational Science and Engineering (CEACSE) awarded to FA.Peer reviewe
The musculature of three species of gastrotrichs surveyed with confocal laser scanning microscopy (CLSM)
No full textThe muscular system of gastrotrichs consists of circular, longitudinal and helicoidal bands that when analysed with confocal laser scanning microscopy, provide new insights into their functional organization and phylogenetic importance. We therefore undertook a comparative study of the muscle organization in three species of Gastrotricha from the orders Macrodasyida (Paradasys sp., Lepidodasyidae; Turbanella sp., Turbanellidae) and Chaetonotida (Polymerurus nodicaudus, Chaetonotidae). The general muscle organization of the marine interstitial macrodasyidans, Paradasys and Turbanella, not only confirms earlier observation on other species but also adds new details concerning the organization and number of helicoidal, longitudinal and other muscle bands (e.g. semicircular band). The freshwater, epibenthic-epiphytic chaetonotid, Polymerurus nodicaudus, has a similar muscular organization to other species of Chaetonotidae, especially species of Chaetonotus, Halichaetonotus and Lepidodermella. Perhaps unique to Polymerurus is the combined presence of an unbranched Ruckenhautmuskel (also in Halichaetonotus and Lepidodermella) and a specialized dorsoventral caudal muscle, which flank the splanchnic component of the longitudinal muscles (only in Chaetonotus and Lepidodermella). This combination, together with the presence of splanchnic dorsoventral muscles, known only in Xenotrichulidae, implies a unique phylogenetic position for Polymerurus, and indicates a potential basal position of this taxon among the Chaetonotidae studied so far (i.e. Aspidiophorus, Chaetonotus, Halichaetonotus and Lepidodermella)
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