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Molecular circumscription of new species of Gyrocotyle Diesing, 1850 (Cestoda) from deep-sea chimaeriform holocephalans in the North Atlantic
Get PDFChimaeras, or ratfishes, are the only extant group of holocephalan fishes and are the sole host group of gyrocotylidean cestodes, which represent a sister group of the true tapeworms (Eucestoda). These unique, non-segmented cestodes have been known since the 1850s and multiple species and genera have been erected despite a general agreement that the delineation of species on the basis of morphology is effectively impossible. Thus, in the absence of molecular studies, the validity of gyrocotylid taxa and their specific host associations has remained highly speculative. Here we report the presence of Gyrocotyle spp. from rarely-caught deep-sea chimaeras collected in the North-East Atlantic, and describe two new species: G. haffii n. sp. from the bent-nose chimaera, Harriota raleighana Goode & Bean, and G. discoveryi n. sp. from the large-eyed rabbit fish, Hydrolagus mirabilis (Collett). Nuclear ribosomal sequence data were generated for individual parasites taken from different host species collected on different dates and from different localities and were combined with previously published sequences. Phylogenetic analyses supported the recognition of independent lineages and clusters, indicative of species, but were indecisive in recovering the root of the tree in analyses that included non-gyrocotylid outgroup taxa. The molecular data reveal variation not reflected in morphology and point to a complex picture of genetic divergence shaped by both isolation and migration in the deep-sea environment.Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The attached file is the published pdf.NHM Repositor
A new specimen of the ornithischian dinosaur Hesperosaurus mjosi from the Upper Jurassic Morrison Formation of Montana, U.S.A., and implications for growth and size in Morrison stegosaurs
Get PDFStegosauria is a clade of ornithischian dinosaurs characterized by a bizarre array of dermal armor that extends from the neck to the end of the tail. Two genera of stegosaur are currently recognised from North America: the well-known Stegosaurus stenops and the much rarer Hesperosaurus mjosi. A new specimen of Hesperosaurus mjosi was discovered in some of the most northerly outcrops of the Upper Jurassic Morrison Formation near Livingston, Montana. The new specimen includes cranial, vertebral, and appendicular material as well as a dermal plate, and the excellent state of preservation of the palate reveals new anatomical information about this region in stegosaurs. Histological examination of the tibia indicates that the individual was not skeletally mature at time of death. Comparison with previously studied Stegosaurus and Hesperosaurus individuals indicates that Hesperosaurus mjosi may have been a smaller species than Stegosaurus stenops. Physiological processes scale with body mass, M, according to the relationship M0.75 in extant megaherbivores; thus, larger animals are better able to cope with more arid environments where forage is less abundant. Under this scenario, it is possible that Stegosaurus stenops and Hesperosaurus mjosi were environmentally partitioned, with the larger S. stenops occupying more arid environments. Analyses of the temporal overlap and latitudinal range of Morrison stegosaurs would allow this hypothesis to be investigated.The attached document is the authors’ final accepted version of the journal article. You are advised to consult the publisher’s version if you wish to cite from it.NHM Repositor
A new family of diprotodontian marsupials from the latest Oligocene of Australia and the evolution of wombats, koalas, and their relatives (Vombatiformes)
Get PDFWe describe the partial cranium and skeleton of a new diprotodontian marsupial from the late Oligocene (~26–25 Ma) Namba Formation of South Australia. This is one of the oldest Australian marsupial fossils known from an associated skeleton and it reveals previously unsuspected morphological diversity within Vombatiformes, the clade that includes wombats (Vombatidae), koalas (Phascolarctidae) and several extinct families. Several aspects of the skull and teeth of the new taxon, which we refer to a new family, are intermediate between members of the fossil family Wynyardiidae and wombats. Its postcranial skeleton exhibits features associated with scratch-digging, but it is unlikely to have been a true burrower. Body mass estimates based on postcranial dimensions range between 143 and 171 kg, suggesting that it was ~5 times larger than living wombats. Phylogenetic analysis based on 79 craniodental and 20 postcranial characters places the new taxon as sister to vombatids, with which it forms the superfamily Vombatoidea as defined here. It suggests that the highly derived vombatids evolved from wynyardiid-like ancestors, and that scratch-digging adaptations evolved in vombatoids prior to the appearance of the ever-growing (hypselodont) molars that are a characteristic feature of all post-Miocene vombatids. Ancestral state reconstructions on our preferred phylogeny suggest that bunolophodont molars are plesiomorphic for vombatiforms, with full lophodonty (characteristic of diprotodontoids) evolving from a selenodont morphology that was retained by phascolarctids and ilariids, and wynyardiids and vombatoids retaining an intermediate selenolophodont condition. There appear to have been at least six independent acquisitions of very large (>100 kg) body size within Vombatiformes, several having already occurred by the late Oligocene.Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.NHM Repositor
Evidence of Vent-Adaptation in Sponges Living at the Periphery of Hydrothermal Vent Environments: Ecological and Evolutionary Implications
Get PDFThe peripheral areas of deep-sea hydrothermal vents are often inhabited by an assemblage of animals distinct to those living close to vent chimneys. For many such taxa, it is considered that peak abundances in the vent periphery relate to the availability of hard substrate as well as the increased concentrations of organic matter generated at vents, compared to background areas. However, the peripheries of vents are less well-studied than the assemblages of vent-endemic taxa, and the mechanisms through which peripheral fauna may benefit from vent environments are generally unknown. Understanding this is crucial for evaluating the sphere of influence of hydrothermal vents and managing the impacts of future human activity within these environments, as well as offering insights into the processes of metazoan adaptation to vents. In this study, we explored the evolutionary histories, microbiomes and nutritional sources of two distantly-related sponge types living at the periphery of active hydrothermal vents in two different geological settings (Cladorhiza from the E2 vent site on the East Scotia Ridge, Southern Ocean, and Spinularia from the Endeavour vent site on the Juan de Fuca Ridge, North-East Pacific) to examine their relationship to nearby venting. Our results uncovered a close sister relationship between the majority of our E2 Cladorhiza specimens and the species Cladorhiza methanophila, known to harbor and obtain nutrition from methanotrophic symbionts at cold seeps. Our microbiome analyses demonstrated that both E2 Cladorhiza and Endeavour Spinularia sp. are associated with putative chemosynthetic Gammaproteobacteria, including Thioglobaceae (present in both sponge types) and Methylomonaceae (present in Spinularia sp.). These bacteria are closely related to chemoautotrophic symbionts of bathymodiolin mussels. Both vent-peripheral sponges demonstrate carbon and nitrogen isotopic signatures consistent with contributions to nutrition from chemosynthesis. This study expands the number of known associations between metazoans and potentially chemosynthetic Gammaproteobacteria, indicating that they can be incredibly widespread and also occur away from the immediate vicinity of chemosynthetic environments in the vent-periphery, where these sponges may be adapted to benefit from dispersed vent fluids.© 2020 Georgieva, Taboada, Riesgo, Díez-Vives, De Leo, Jeffreys, Copley, Little, Ríos, Cristobo, Hestetun and Glover. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.NHM Repositor
The Importance and Potential Value of a Regional Midsize Arthropod Collection: An Example of IBULC
Get PDFDuring the last three centuries, people involved in natural history sciences have produced thousands of natural
history collections worldwide. Specimens have been used for scientific proof of various discoveries and for gaining new
knowledge in many disciplines of science not only in the area of biodiversity but also in taxonomy, species biology and
ecology, parasitology, evolution, organisms’ responses to climate change, nature conservation and many other biological
sub-disciplines. Despite never-ending financial struggles, the world’s largest collections as well as many regional
midsize collections contain billions of specimens. This provides an enormous database for present and future studies.
This article presents a critical description of the material of the Institute of Biology, University of Latvia collection
(IBULC) containing roughly 59,000 identified arthropod individuals of about 3,700 species, including twenty-eight
primary types as a part of around ninety type specimens, to illustrate the importance of midsize regional natural history
collections in detail.Some Rights Reserved.
Public Licensed Material: Available under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Public License (CC BY-NC-ND 4.0). The use of this material is permitted for non-commercial use provided the creator(s) and publisher receive attribution. No derivatives of this version are permitted. Official terms of this public license apply as indicated here: https://creativecommons.org/licenses/by-nc-nd/4.0/legalcodeNHM Repositor
A critical review of harm associated with plastic ingestion on vertebrates
No full textStudies documenting plastic ingestion in animals have increased in recent years. Many do not describe the less conspicuous, sub-lethal impacts of plastic ingestion, such as reduced body condition or physiological changes. This means the severity of this global problem may have been underestimated. We conducted a critical review on the sub-lethal impacts of plastic ingestion on marine vertebrates (excluding fish). We found 34 papers which tried to measure plastics' impact using a variety of tools, and less than half of these detected any impact. The most common tools used were visual observations and body condition indices. Tools that explore animal physiology, such as histopathology, are a promising future approach to uncover the sub-lethal impacts of plastic ingestion in vertebrates. We encourage exploring impacts on species beyond the marine environment, using multiple tools or approaches, and continued research to discern the hidden impacts of plastic on global wildlife.© 2020 Elsevier B.V. All rights reserved. The attached document is the authors’ final accepted version of the journal article, it appears here under a Creative Commons Attribution-non commercial-no derivatives licence https://creativecommons.org/licenses/by-nc-nd/2.0/. You are advised to consult the publisher’s version if you wish to cite from it.NHM Repositor
The Caribbean needs big marine protected areas
Get PDFThe attached document is the author(’s’) final accepted/submitted version of the journal article. You are advised to consult the publisher’s version if you wish to cite from it.NHM Repositor
The origin and diversification of pteropods precede past perturbations in the Earth’s carbon cycle
Get PDFOpen AccessPteropods are a group of planktonic gastropods that are widely regarded as biological indicators for assessing the impacts of ocean acidification. Their aragonitic shells are highly sensitive to acute changes in ocean chemistry. However, to gain insight into their potential to adapt to current climate change, we need to accurately reconstruct their evolutionary history and assess their responses to past changes in the Earth’s carbon cycle. Here, we resolve the phylogeny and timing of pteropod evolution with a phylogenomic dataset (2,654 genes) incorporating new data for 21 pteropod species and revised fossil evidence. In agreement with traditional taxonomy, we recovered molecular support for a division between “sea butterflies” (Thecosomata; mucus-web feeders) and “sea angels” (Gymnosomata; active predators). Molecular dating demonstrated that these two lineages diverged in the early Cretaceous, and that all main pteropod clades, including shelled, partially-shelled, and unshelled groups, diverged in the mid- to late Cretaceous. Hence, these clades originated prior to and subsequently survived major global change events, including the Paleocene–Eocene Thermal Maximum (PETM), the closest analog to modern-day ocean acidification and warming. Our findings indicate that planktonic aragonitic calcifiers have shown resilience to perturbations in the Earth’s carbon cycle over evolutionary timescales.Copyright © 2020 the Author(s). Published by PNAS. This open access article is distributed under Creative Commons Attribution License 4.0 (CC BY).NHM Repositor
DeWorm 3: Charting a path towards STH elimination.
Get PDFThis is an open access publication from the Natural History MuseumNHM Repositor
Shells from the shoreline - a new perspective on changing Lake Tanganyika
Get PDFOn-line, freely available from zenodoUsing past records to provide context and guidance in a changing world.
Overwhelming evidence shows that ecological, evolutionary and earth system processes have been profoundly altered by humans, and will continue to be altered for millennia to come. But, what was life like before human impacts and what processes brought us into the Anthropocene epoch?
The rapidly growing field of Conservation Paleobiology uses fossil and historical records to provide valuable context and guidance to conservation of life on Earth.
This symposium was organised by Aaron O'Dea, Daniele Scarponi, Laura Airoldi & Paolo Albano. It brought over 80 students and researchers together to provide an informal venue for lively talks and a chance to meet old and new colleagues.This is an open access publication. See https://zenodo.org/record/3663054#.XmDu-aj7QdU for further details.NHM Repositor