4.3 Review

Renewed perspectives on the sedentary-pelagic last common bilaterian ancestor

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Article Paleontology

Taxonomic revision of Ediacaran tubular fossils: Cloudina, Sinotubulites and Conotubus

Ben Yang et al.

Summary: This study taxonomically revised the Ediacaran tubular fossils Cloudina, Sinotubulites, and Conotubus, and designated lectotypes for Sinotubulites baimatuoensis and Conotubus hemiannulatus. Sinotubulites baimatuoensis was reported in Namibia and Cloudina waldei was reassigned to Sinotubulites baimatuoensis, extending its occurrence range to Brazil. The lectotype of Conotubus hemiannulatus shows characteristics that distinguish it from other collared Ediacaran tubular fossils.

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Article Geosciences, Multidisciplinary

The Ediacaran origin of Ecdysozoa: integrating fossil and phylogenomic data

Richard J. Howard et al.

Summary: This study estimates the evolutionary time-tree for Ecdysozoans using improved fossil calibrations. The results suggest that Scalidophora is the sister group to Nematoida + Panarthropoda and that the divergence of Ecdysozoa occurred at least 23 myr before the first potential ecdysozoan trace fossils.

JOURNAL OF THE GEOLOGICAL SOCIETY (2022)

Article Biology

Early cephalopod evolution clarified through Bayesian phylogenetic inference

Alexander Pohle et al.

Summary: Despite the excellent fossil record of cephalopods, their early evolution remains poorly understood. In this study, researchers conducted a comprehensive phylogenetic analysis of Cambrian and Ordovician cephalopods and resolved existing controversies. The results revealed three major monophyletic groups, and clarified the evolutionary pathways. The study also provided insights into the application of Bayesian phylogenetic inference on morphological datasets, suggesting the use of quartet similarity metrics and posterior pruned maximum clade credibility trees for assessing support for phylogenetic relationships among relevant taxa.

BMC BIOLOGY (2022)

Article Geosciences, Multidisciplinary

Cloudina aggregates from the uppermost Dengying Formation, Three Gorges area, South China, and stratigraphical implications

Lei Zhang et al.

Summary: In this study, accumulations of Cloudina were discovered in the Baiguotang section of the Three Gorges area in South China, providing new insights into the paleobiology, paleoecology, and biostratigraphy of this iconic Ediacaran organism. The findings suggest that the Ediacaran-Cambrian boundary should be located within the lower part of the Yanjiahe Formation.

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Biomineralization: Integrating mechanism and evolutionary history

Pupa U. P. A. Gilbert et al.

Summary: Calcium carbonate biomineralizing organisms have had significant roles in the history of life and the global carbon cycle. By integrating mechanisms of CaCO3 skeleton formation with evolutionary history, omics, and isotopic data, a model for CaCO3 biomineralization applicable to all phyla is proposed, aiding in understanding the environmental sensitivity of marine calcifiers and their resilience in 21st century acidifying oceans.

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Ontogeny, Phylotypic Periods, Paedomorphosis, and Ontogenetic Systematics

Alexander Martynov et al.

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FRONTIERS IN ECOLOGY AND EVOLUTION (2022)

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Morphological Characters Can Strongly Influence Early Animal Relationships Inferred from Phylogenomic Data Sets

Johannes S. Neumann et al.

Summary: There are significant discrepancies between morphological and phylogenomic data for the deep evolution of animals. Incorporating morphological data can influence the inference of the earliest-branching lineage of the animal kingdom. Increasing taxon sampling improves phylogenetic stability, and morphology should not be underestimated in combined data analyses.

SYSTEMATIC BIOLOGY (2021)

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A new method for quantifying heterochrony in evolutionary lineages

James C. Lamsdell

Summary: This study reveals the correlation between morphological changes in species and environmental gradients, primarily caused by heterochronic processes. A new metric called heterochronic weighting is introduced to quantify these changes, showing concerted independent heterochronic trends in xiphosuran chelicerates. The distribution of heterochronic weightings among species suggests influences from historical, phylogenetic processes, and external ecological pressures.

PALEOBIOLOGY (2021)

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Soft part preservation in hyolithids from the lower Cambrian (Stage 4) Guanshan Biota of South China and its implications

Fan Liu et al.

Summary: This study presents remarkably preserved hyolithids from the Guanshan Biota in Yunnan Province, China, providing new evidence for the internal structure and soft tissue preservation of these animals and contributing to the reconstruction of hyolithid anatomy. The research reveals that the gut anatomy of hyolithids was evolutionarily conservative from the early Cambrian through to at least the Ordovician period.

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY (2021)

Article Biology

Tube-dwelling in early animals exemplified by Cambrian scalidophoran worms

Deng Wang et al.

Summary: This study explores the paleobiology of tube-dwelling worms, focusing on Selkirkia fossils from the Chengjiang Lagerstatte in China. The research reveals Selkirkia as a stem-group priapulid, capable of movement inside its protective tube. The presence of brachiopod epibionts suggests a potential ecological relationship and evolutionary significance of tube-dwelling in early Cambrian animals.

BMC BIOLOGY (2021)

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The trace fossil record of the Nama Group, Namibia: Exploring the terminal Ediacaran roots of the Cambrian explosion

Simon A. F. Darroch et al.

Summary: The Ediacaran-Cambrian transition is a significant geobiological revolution in Earth history, involving multiple waves of evolutionary radiation and apparent mass extinctions. Factors such as ecosystem engineering, trace fossils, and bioturbation may have played crucial roles during this period.

EARTH-SCIENCE REVIEWS (2021)

Article Biology

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Thibaut Brunet et al.

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Article Paleontology

Dickinsonia from the Ediacaran Dengying Formation in the Yangtze Gorges area, South China

Xiao-Peng Wang et al.

Summary: The stratigraphic distribution of Ediacara-type fossils in the Shibantan Member indicates a unique preservation of both the White Sea and Nama assemblages. The new data presented suggests that Dickinsonia had wider paleogeographic and paleoenvironmental distributions, implying strong dispersal capability and environmental tolerance.

PALAEOWORLD (2021)

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Ediacaran metazoan reveals lophotrochozoan affinity and deepens root of Cambrian Explosion

A. J. Shore et al.

Summary: Through exceptional preservation, a phylogenetic connection between Ediacaran and Cambrian metazoans is established. The discovery of three-dimensional, pyritized soft tissue in Namacalathus provides evidence of a lophotrochozoan affinity and suggests deep roots of modern lophotrochozoan phyla in the Ediacaran period. This supports molecular phylogenies and demonstrates the early development of biomineralization abilities in these ancient organisms.

SCIENCE ADVANCES (2021)

Article Paleontology

Ediacaran metazoan fossils with siliceous skeletons from the Digermulen Peninsula of Arctic Norway

Malgorzata Moczydlowska et al.

Summary: A new assemblage of Ediacaran metazoan fossils from Arctic Norway is reported in this study, interpreted to be biomineralized by primary silica. The fossil-bearing interval is estimated to be approximately 575 million years old.

JOURNAL OF PALEONTOLOGY (2021)

Article Multidisciplinary Sciences

Profiling cellular diversity in sponges informs animal cell type and nervous system evolution

Jacob M. Musser et al.

Summary: Through whole-body single-cell RNA sequencing in sponges, researchers identified 18 distinct cell types, including contractile pinacocytes, amoeboid phagocytes, and secretory neuroid cells. These cells interact closely with digestive choanocytes, which express scaffolding and receptor proteins, indicating a communication system organized around sponge digestive chambers. Visualizing neuroid cells revealed secretory vesicles and cellular projections enwrapping choanocyte microvilli and cilia, suggesting the presence of conserved modules that may have evolved into synaptic structures in other animals' nervous systems.

SCIENCE (2021)

Article Biology

Developmental processes in Ediacara macrofossils

Scott D. Evans et al.

Summary: Analysis of representative taxa from the Ediacaran White Sea assemblage suggests that early animals likely possessed genetic pathways for multicellularity, axial polarity, musculature, and a nervous system. The absence of major differentiation of macroscopic body units in these animals supports the hypothesis that features like heads with concentrated sensory machinery or ventral nerve cords evolved independently in disparate bilaterian clades.

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Catherine S. McFadden et al.

Summary: Anthozoan cnidarians, such as corals and sea anemones, are crucial foundation species capable of building massive reef complexes supporting entire ecosystems. With a time-calibrated phylogeny for 234 species constructed from ultraconserved elements and exon loci, evolutionary origins of major Anthozoa clades and salient morphological features have been explored. Notable findings include the monophyly of Hexacorallia and Octocorallia, divergence dating placing Anthozoa in the Cryogenian to Tonian periods, and the evolution of colonial growth forms and photosymbiont associations in the Ediacaran and Cambrian periods respectively.

SYSTEMATIC BIOLOGY (2021)

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Exceptionally preserved early Cambrian bilaterian developmental stages from Mongolia

Michael Steiner et al.

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NATURE COMMUNICATIONS (2021)

Article Multidisciplinary Sciences

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David A. Salamanca-Diaz et al.

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SCIENTIFIC REPORTS (2021)

Article Multidisciplinary Sciences

Pentaradial eukaryote suggests expansion of suspension feeding in White Sea-aged Ediacaran communities

Kelsie Cracknell et al.

Summary: The study used three-dimensional modeling and computational fluid dynamics to investigate the suspension feeding mode of the Ediacaran pentaradial eukaryote Arkarua, revealing it as a passive suspension feeder and adding to the growing number of Ediacaran benthic suspension feeders. This suggests that the widespread suspension feeding in the early Cambrian may have played a key role in ecological innovation and escalation that led to the Cambrian explosion.

SCIENTIFIC REPORTS (2021)

Review Biochemistry & Molecular Biology

The origin of animals: an ancestral reconstruction of the unicellular-to-multicellular transition

Nuria Ros-Rocher et al.

Summary: This article summarizes key events and features in the transition of animals from a single-celled ancestor to a multicellular entity, inferring the characteristics of the last common multicellular ancestor and the last unicellular ancestor through comparative genomic analyses. Understanding the transition to animal multicellularity is gradual and involves the use of gene regulatory mechanisms in early development and morphogenesis planning. New avenues of research are discussed to complement these studies in the future.

OPEN BIOLOGY (2021)

Article Multidisciplinary Sciences

Hox genes regulate asexual reproductive behavior and tissue segmentation in adult animals

Christopher P. Arnold et al.

Summary: Hox genes play roles in tissue segmentation and behavior associated with asexual reproduction in adult planarian flatworms. Five Hox genes are essential for asexual reproduction, with hox3 silence resulting in supernumerary fission segments and post2b silence eliminating segmentation. The opposing roles of hox3 and post2b in segmentation are reflected in their regulation of fission behavior.

NATURE COMMUNICATIONS (2021)

Article Geosciences, Multidisciplinary

Priapulid worms from the Cambrian of China shed light on reproduction in early animals

Xiao-yu Yang et al.

Summary: Researchers have discovered egg clusters of the tube-dwelling priapulid worm from the Cambrian period, providing insights into the unchanged structure of female tubular gonads over half a billion years. These findings offer key information on the reproductive organs and strategies of early ecdysozoans, shedding light on the significance of ecology in the reproductive strategies and lifestyles of modern and Cambrian worms.

GEOSCIENCE FRONTIERS (2021)

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Enduring evolutionary embellishment of cloudinids in the Cambrian

Tae-Yoon S. Park et al.

Summary: Studying the Ediacaran-Cambrian transition and the Cambrian Explosion is crucial for understanding the evolutionary history of animals. Cloudinids, with derived characters linking them to cnidarians in the Cambrian, provide insight into the response of a primitive animal group during this period of rapid diversification.

ROYAL SOCIETY OPEN SCIENCE (2021)

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Evidence for sponges as sister to all other animals from partitioned phylogenomics with mixture models and recoding

Anthony K. Redmond et al.

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NATURE COMMUNICATIONS (2021)

Article Multidisciplinary Sciences

Lack of support for Deuterostomia prompts reinterpretation of the first Bilateria

Paschalia Kapli et al.

Summary: Bilaterally symmetric animals are divided into Protostomia and Deuterostomia, with Protostomia consistently receiving strong support in phylogenetic studies. However, support for Deuterostomia is equivocal and may be influenced by systematic errors, suggesting that the common ancestor of bilaterians and deuterostomes may have been deuterostome-like.

SCIENCE ADVANCES (2021)

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Maria Capa et al.

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DIVERSITY-BASEL (2021)

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Anne Hildenbrand et al.

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COMMUNICATIONS BIOLOGY (2021)

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Ludwik Gasiorowski et al.

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CURRENT BIOLOGY (2021)

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Haijing Sun et al.

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GEOLOGICAL MAGAZINE (2021)

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Yuanning Li et al.

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MOLECULAR BIOLOGY AND EVOLUTION (2021)

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Possible poriferan body fossils in early Neoproterozoic microbial reefs

Elizabeth C. Turner

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NATURE (2021)

Review Paleontology

Current understanding on the Cambrian Explosion: questions and answers

Xingliang Zhang et al.

Summary: The Cambrian Explosion is a three-phased burst of animal body plans, characterized by changes in population diversity, morphospace exploration, and ecosystem complexity. The high number of stem groups in the early history of animals led to the morphological gaps across phyla that exist today. Despite a broad range of metazoan morphospace occupation in the early Cambrian, the exact causes of the explosion are complex and cannot be attributed to a single factor.
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Karma Nanglu et al.

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PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES (2021)

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Tatiana Lebedeva et al.

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NATURE COMMUNICATIONS (2021)

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Ed Landing et al.

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Alan J. S. Beavan et al.

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