Proceedings of the Royal Society B: Biological Sciences最新文献_第5页

Affective bodily responses in monkeys predict subsequent pessimism, but not vice versa.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-05 DOI: 10.1098/rspb.2024.2549

Sakumi Iki, Ikuma Adachi

{"title":"Affective bodily responses in monkeys predict subsequent pessimism, but not vice versa.","authors":"Sakumi Iki, Ikuma Adachi","doi":"10.1098/rspb.2024.2549","DOIUrl":"10.1098/rspb.2024.2549","url":null,"abstract":"Affect is a complex interplay of behaviour, physiology, cognition and subjective feelings. The James-Lange theory, which posits that affective bodily responses occur first and subsequently shape our affective experiences, has been extensively studied in humans but remains underexplored in non-human animals. This study employs a judgement bias test to explore the relationship between peripheral bodily responses, specifically self-scratching associated with negative affect, and shifts in cognitive information-processing modes (i.e. a 'pessimistic' judgement bias characterized by heightened anticipation of undesirable outcomes) in Japanese macaques (Macaca fuscata). Our findings support the hypothesis that bodily responses precede and influence changes in cognitive modes, demonstrating that self-scratching predicts subsequent pessimistic judgements, but not vice versa. This study provides comparative insights into the biological underpinnings of affect, highlighting that peripheral behaviours can shape cognitive processes in non-human primates. These results have broader implications for understanding the evolutionary continuity and adaptive significance of affective response systems across species.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20242549"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11793958/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143190256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Circatidal control of gene expression in the deep-sea hot vent shrimp Rimicaris leurokolos.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-05 DOI: 10.1098/rspb.2024.2970

Hongyin Zhang, Takuya Yahagi, Norio Miyamoto, Chong Chen, Qingqiu Jiang, Pei-Yuan Qian, Jin Sun

{"title":"Circatidal control of gene expression in the deep-sea hot vent shrimp Rimicaris leurokolos.","authors":"Hongyin Zhang, Takuya Yahagi, Norio Miyamoto, Chong Chen, Qingqiu Jiang, Pei-Yuan Qian, Jin Sun","doi":"10.1098/rspb.2024.2970","DOIUrl":"10.1098/rspb.2024.2970","url":null,"abstract":"Biological clocks are a ubiquitous feature of all life, enabling the use of natural environmental cycles to track time. Although studies on circadian rhythms have contributed greatly to the knowledge of chronobiology, biological rhythms in dark biospheres such as the deep sea remain poorly understood. Here, based on a free-running experiment in the laboratory, we reveal potentially endogenous rhythms in the gene expression of the deep-sea hydrothermal vent shrimp Rimicaris leurokolos. Oscillations with approximately 12 h periods, probably reflecting tidal influence, greatly prevail over others in the temporal transcriptome, indicating R. leurokolos probably depends on a circatidal clock consisting of at least some components independent from the circadian clocks. The tidal transcripts exhibit an antiphased expression pattern divided into two internally synchronized clusters, correlated with wide-ranging biological processes that occur in the nucleus and cytoplasm, respectively. In addition, the tidal transcripts showed great similarities with genes in fruit flies and mice exhibiting approximately 12 h ultradian rhythms, indicating that the tide probably had a broad impact on the evolution of approximately 12 h oscillations found across the Metazoa. These findings not only provide new insights into the temporal adaptations in deep-sea organisms but also highlight hydrothermal vent organisms as intriguing models for chronobiological studies, particularly those linked to approximately 12 h ultradian rhythms.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20242970"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11793976/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143190270","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Host traits and temperature predict biogeographical variation in seagrass disease prevalence.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-12 DOI: 10.1098/rspb.2024.3055

F R Schenck, J K Baum, K E Boyer, J E Duffy, F J Fodrie, J Gaeckle, T C Hanley, C M Hereu, K A Hovel, P Jorgensen, D L Martin, N E O'Connor, B J Peterson, J J Stachowicz, A R Hughes

{"title":"Host traits and temperature predict biogeographical variation in seagrass disease prevalence.","authors":"F R Schenck, J K Baum, K E Boyer, J E Duffy, F J Fodrie, J Gaeckle, T C Hanley, C M Hereu, K A Hovel, P Jorgensen, D L Martin, N E O'Connor, B J Peterson, J J Stachowicz, A R Hughes","doi":"10.1098/rspb.2024.3055","DOIUrl":"10.1098/rspb.2024.3055","url":null,"abstract":"Diseases are ubiquitous in natural systems, with broad effects across populations, communities and ecosystems. However, the drivers of many diseases remain poorly understood, particularly in marine environments, inhibiting effective conservation and management measures. We examined biogeographical patterns of infection in the foundational seagrass Zostera marina by the parasitic protist Labyrinthula zosterae, the causative agent of seagrass wasting disease, across >20° of latitude in two ocean basins. We then identified and characterized relationships among wasting disease prevalence and a suite of host traits and environmental variables. Host characteristics and transmission dynamics explained most of the variance in prevalence across our survey, yet the particular host traits underlying these relationships varied between oceans, with host size and nitrogen content important in the Pacific and host size and density most important in the Atlantic. Temperature was also a key predictor of prevalence, particularly in the Pacific Ocean. The strength and shape of the relationships between prevalence and some predictors differed in our large-scale survey versus previous experimental and site-specific work. These results show that both host characteristics and environment influence host-parasite interactions, and that some such effects scale up predictably, whereas others appear to depend on regional or local context.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20243055"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11813588/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143399803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rapid evolution of prehistoric dogs from wolves by natural and sexual selection emerges from an agent-based model.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-12 DOI: 10.1098/rspb.2024.2646

David C Elzinga, Ryan Kulwicki, Samuel Iselin, Lee Spence, Alex Capaldi

{"title":"Rapid evolution of prehistoric dogs from wolves by natural and sexual selection emerges from an agent-based model.","authors":"David C Elzinga, Ryan Kulwicki, Samuel Iselin, Lee Spence, Alex Capaldi","doi":"10.1098/rspb.2024.2646","DOIUrl":"10.1098/rspb.2024.2646","url":null,"abstract":"Wolves are among the earliest animals to be domesticated. However, the mechanism by which ancient wolves were domesticated into modern dogs is unknown. Most of the prevailing domestication hypotheses posit that humans selectively bred wolves that were more docile. However, a competing hypothesis states that wolves that were less hostile towards humans would essentially domesticate themselves by naturally selecting for tamer wolves since that would allow for easier access to food from human settlements. A major critique of the latter hypothesis is whether evolution by this natural selective pathway could have occurred in a sufficiently short time span. Simulating the process would help demonstrate if such an objection is sufficient to dismiss this hypothesis. Thus, we constructed an agent-based model of the evolution of a single trait, a measure of human tolerance, in canines to test the merit of the time constraint objection. We tested scenarios both with and without mate preference to provide a potential sexual selective force. We used fecundity and mortality rates from the literature for validation. Hartigan's dip test of unimodality was used to measure if and when divergence of populations occurred. Our results indicate that the proto-domestication hypothesis cannot be rejected on the basis of time constraints.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20242646"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11813586/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143399807","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Museum 'dark data' show variable impacts on deep-time biogeographic and evolutionary history.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-26 DOI: 10.1098/rspb.2024.2481

Christopher D Dean, Jeffrey R Thompson

{"title":"Museum 'dark data' show variable impacts on deep-time biogeographic and evolutionary history.","authors":"Christopher D Dean, Jeffrey R Thompson","doi":"10.1098/rspb.2024.2481","DOIUrl":"10.1098/rspb.2024.2481","url":null,"abstract":"The age of digitally accessible datasets has transformed palaeontology, enabling previously impossible macroevolutionary insights. However, a substantial reservoir of generally inaccessible 'dark data' resides within museum collections, which may alter our understanding of ancient groups and their ecological and evolutionary history. We demonstrate how the addition of data held exclusively in museums impacts our macroevolutionary understanding of an entire taxonomic group, using a dataset of Palaeozoic echinoids containing the majority of museum occurrences for the clade. We find that museum 'dark data' shows clear differences in composition compared to data available in the published literature and strongly impacts biogeographic patterns, increasing the average geographic range size of taxa by 35%. Global model results assessing drivers of diversity are also significantly affected by the addition of museum-only data. Conversely, 'dark data' have a more limited impact on the temporal ranges of taxa or estimates of overall diversity and are impacted by similar socio-geographic biases as the published record. These findings show that unpublished museum data are necessary to obtain a complete understanding of macroevolutionary patterns in deep-time, illustrating the importance of the collection, curation, digitization and continued care of 'dark data' in the age of 'Big Data' in palaeobiology.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2041","pages":"20242481"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11858742/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143503743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cytoplasmic incompatibility factor proteins from Wolbachia prophage are costly to sperm development in Drosophila melanogaster.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-12 DOI: 10.1098/rspb.2024.3016

Rupinder Kaur, Seth R Bordenstein

{"title":"Cytoplasmic incompatibility factor proteins from Wolbachia prophage are costly to sperm development in Drosophila melanogaster.","authors":"Rupinder Kaur, Seth R Bordenstein","doi":"10.1098/rspb.2024.3016","DOIUrl":"10.1098/rspb.2024.3016","url":null,"abstract":"The symbiosis between arthropods and Wolbachia bacteria is globally widespread, largely due to selfish-drive systems that favour the fitness of symbiont-transmitting females. The most common drive, cytoplasmic incompatibility (CI), is central to arboviral control efforts. In Drosophila melanogaster carrying wMel Wolbachia deployed in mosquito control, two prophage genes in Wolbachia, cifA and cifB, cause CI that results in a paternal-effect lethality of embryos in crosses between Wolbachia-bearing males and aposymbiotic females. While the CI mechanism by which Cif proteins alter sperm development has recently been elucidated in D. melanogaster and Aedes aegypti mosquitoes, the Cifs' extended impact on male reproductive fitness such as sperm morphology and quantity remains unclear. Here, using cytochemical, microscopic and transgenic assays in D. melanogaster, we demonstrate that both CifA and CifB cause a significant portion of defects in elongating spermatids, culminating in malformed mature sperm nuclei. Males expressing Cifs have reduced spermatid bundles and sperm counts, and transgenic expression of Cifs can occasionally result in no mature sperm formation. We reflect on Cifs' varied functional impacts on the Host Modification model of CI as well as host evolution, behaviour and vector control strategies.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20243016"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11813569/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143399802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using mobile eye tracking to study dogs' understanding of human referential communication.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-12 DOI: 10.1098/rspb.2024.2765

Christoph J Völter, Karoline Gerwisch, Paula Berg, Zsófia Virányi, Ludwig Huber

{"title":"Using mobile eye tracking to study dogs' understanding of human referential communication.","authors":"Christoph J Völter, Karoline Gerwisch, Paula Berg, Zsófia Virányi, Ludwig Huber","doi":"10.1098/rspb.2024.2765","DOIUrl":"10.1098/rspb.2024.2765","url":null,"abstract":"The extent to which dogs understand human referential communication is among the most studied questions in canine cognition research. While it is widely accepted that dogs follow (some) human referential signals, the way they understand them remains controversial. Here, we applied mobile eye tracking with dogs to investigate during real-world interactions how ostensive pointing and gaze cues direct dogs' visual attention and bias their subsequent choices in an object-choice task. We addressed the question of whether dogs would exhibit a greater response to referential communication compared with other directional cues. Five conditions were tested (pointing, pointing + gazing, gazing, fake throwing and no-cue control), each cue condition indicating the location of a hidden food reward. Results demonstrated that the combination of pointing and gazing significantly increased dogs' attention towards the designated referent. In pointing + gazing, dogs maintained longer attention on the referent compared with other conditions and they approached it significantly above chance levels. While the alternative cue (fake throwing) moved the dogs' gaze to the indicated direction, it did not increase the frequency of gaze shifts to the precise referent location. Our findings highlight that the joint use of pointing and gazing is a particularly effective method for directing dogs' attention to a referent.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20242765"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11813580/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143399811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metabolic rate of angiosperm seeds: effects of allometry, phylogeny and bioclimate.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-19 DOI: 10.1098/rspb.2024.2683

Emma L Dalziell, Sean Tomlinson, David J Merritt, Wolfgang Lewandrowski, Shane R Turner, Philip C Withers

{"title":"Metabolic rate of angiosperm seeds: effects of allometry, phylogeny and bioclimate.","authors":"Emma L Dalziell, Sean Tomlinson, David J Merritt, Wolfgang Lewandrowski, Shane R Turner, Philip C Withers","doi":"10.1098/rspb.2024.2683","DOIUrl":"10.1098/rspb.2024.2683","url":null,"abstract":"Energetics is considered a fundamental 'currency' of ecology and the way that metabolic rate (MR)-the rate of energy expenditure on biological processes-scales relative to the size of the organism can be both an adaptive benefit and a constraint in mediating the energetic demands of ecological processes. Since few investigations have examined this relationship for angiosperm seeds, we measured standard metabolic rate (SMR) of 108 species' seeds, spanning a broad suite of species. We used fluorescence-based closed-system respirometry at temperatures between 18°C and 30°C, based on optimal germination conditions, and Q10 corrected to 20°C. The allometric relationship for SMR as a function of seed mass was 0.081 × M0.780 with ordinary least squares regression and 0.057 × M0.746 with phylogenetic generalized least squares regression. This relationship is consistent with the pervasive metabolic allometry documented for both vegetative plants and domesticated cultivars (n = 14) which had higher SMR residuals than wild species (seven weeds and 87 Australian native species). For native species, seed SMR was strongly related to measures of increasing environmental aridity (annual mean temperature and precipitation, and precipitation in the wettest quarter), consistent with seeds from arid environments having a high MR to supply energy needed to germinate rapidly. By comparing SMR of seeds for diverse angiosperm species, we provide insights into inter-relationships of physiology, distribution, climate and domestication on seed ecology and suggest that energetics represents a valuable addition to established functional trait libraries for seed biology.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2041","pages":"20242683"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11836704/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143449954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Does literature evolve one funeral at a time? 文学是一次次葬礼演变而来的吗？

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-05 DOI: 10.1098/rspb.2024.2033

Oleg Sobchuk, Bret Beheim

{"title":"Does literature evolve one funeral at a time?","authors":"Oleg Sobchuk, Bret Beheim","doi":"10.1098/rspb.2024.2033","DOIUrl":"10.1098/rspb.2024.2033","url":null,"abstract":"The cultural evolution of literary fiction is rarely studied, but rich literary data can help address some of the general problems of cultural change. In this article, we use a massive dataset of Anglophone fiction (over 23 000 books) and the tools of natural language processing to understand whether the long-term change of topics in books is driven by the individual change of authors or by the cohort turnover in author populations. To answer this question, we borrow a method from evolutionary ecology: decomposition analysis based on the Price equation. To prove the suitability of this method, we first apply it to simulated data and show that it does allow distinguishing between these two processes. Afterwards, we decompose the temporal trajectories of topics and measure the relative effects of the arrival of newcomer authors (entrances), the retirement of authors (exits) and the change of topic preferences during authors' lifetimes (individual change). We find that cohort turnover is a stronger force than individual change. Within the cohort effects, the effect of entrances is almost twice as strong as the effect of exits. Using simulated data, we discover that this difference stems from the unequal lengths of authors' careers.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20242033"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11793956/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143189452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Exotic cuticular specializations in a Cambrian scalidophoran.

IF 3.8 1区生物学

Proceedings of the Royal Society B: Biological Sciences Pub Date : 2025-02-01 Epub Date: 2025-02-05 DOI: 10.1098/rspb.2024.2806

Giovanni Mussini, Nicholas J Butterfield

{"title":"Exotic cuticular specializations in a Cambrian scalidophoran.","authors":"Giovanni Mussini, Nicholas J Butterfield","doi":"10.1098/rspb.2024.2806","DOIUrl":"10.1098/rspb.2024.2806","url":null,"abstract":"Scalidophora, the ecdysozoan group including priapulids, kinorhynchs and loriciferans, comprises some of the most abundant and ecologically important Cambrian animals. However, reconstructions of the morphology and lifestyles of fossil scalidophorans are often hampered by poor preservation of their submillimetre-scale cuticular specializations. Based on exceptionally preserved small carbonaceous fossils (SCFs), we describe a new scalidophoran-grade animal, Scalidodendron crypticum gen. et sp. nov., from the Early to Middle Cambrian Hess River Formation of northern Canada. The Hess River SCFs comprise pharyngeal teeth, coniform sclerites and hook-like sclerites, all closely comparable to known scalidophoran counterparts. The coniform and hook-like sclerites recurrently associate with arborescent cuticular projections that show multiple orders of branching, morphologically unlike those of any known living or fossil scalidophoran. The fine splintering and inferred post-pharyngeal position of these structures argue against locomotory, feeding and defensive roles with direct analogues in extant counterparts. As such, the arborescent structures of Scalidodendron denote a previously cryptic range of morphological variation in Cambrian scalidophorans, paralleling that of coeval panarthropods but expressed at a fundamentally different level of anatomical organization.","PeriodicalId":20589,"journal":{"name":"Proceedings of the Royal Society B: Biological Sciences","volume":"292 2040","pages":"20242806"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11793982/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143189679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0