A genome-based phylogeny for Mollusca is concordant with fossils and morphology

Science, Journal Year: 2025, Volume and Issue: 387(6737), P. 1001 - 1007

Published: Feb. 27, 2025

Extreme morphological disparity within Mollusca has long confounded efforts to reconstruct a stable backbone phylogeny for the phylum. Familiar molluscan groups—gastropods, bivalves, and cephalopods—each represent diverse radiation with myriad morphological, ecological, behavioral adaptations. The phylum further encompasses many more unfamiliar experiments in animal body-plan evolution. In this work, we reconstructed living on basis of metazoan BUSCO (Benchmarking Universal Single-Copy Orthologs) genes extracted from 77 (13 new) genomes, including multiple members all eight classes two high-quality genome assemblies monoplacophorans. Our analyses confirm proposed morphology show widespread genomic variation. flexibility likely explains both historic challenges their genomes evolutionary success.

Language: Английский

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New Silurian aculiferan fossils reveal complex early history of Mollusca

Nature, Journal Year: 2025, Volume and Issue: 637(8046), P. 631 - 636

Published: Jan. 8, 2025

Abstract Mollusca is the second most species-rich animal phylum, but pathways of early molluscan evolution have long been controversial 1–5 . Modern faunas retain only a fraction past forms in this hyperdiverse and long-lived group. Recent analyses 6–8 consistently recovered fundamental split into two sister clades, Conchifera (including gastropods, bivalves cephalopods) Aculifera 9 , comprising Polyplacophora (‘chitons’) Aplacophora. Molluscan toto characterized by plasticity body-plan characters 10 historically aculiferans interpreted as more conservative 10,11 The few completely preserved aculiferan or aculiferan-like fossils from Palaeozoic 12–19 largely regarded transitional that inform questions character polarity between extant polyplacophoran aplacophoran body 20,21 history aculiferans, morphological ecological range they occupied, remain inadequately sampled. Here we describe new three-dimensionally species Silurian Herefordshire Lagerstätte 22,23 which substantially extend clade. Phylogenetic indicate positions within complex nexus taxa suggest reversals states such presence valves nature foot. In contrast to previous hypotheses conservatism, generated profusion unusual comparable diversification other crown-group molluscs.

Language: Английский

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Evaluation of the effect of larval metamorphosis of some digenetic parasites within the digestive gland tissues of the freshwater ampullariid snails, Lanistes carinatus (Olivier, 1804)

Parasitology International, Journal Year: 2025, Volume and Issue: 108, P. 103078 - 103078

Published: April 8, 2025

Language: Английский

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Spermiogenesis in Aplacophora (Mollusca) provides insight into evolution of Bilateria

Research Square (Research Square), Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 11, 2024

Sperm structure among species in each Class of Aplacophora is highly conserved but between the two Classes radically different. This together with numerous morphological differences groups, suggests a long separation and likely paraphyletic relationship, which has been suggested past not supported by molecular analyses. All Caudofoveata examined have unique externally-fertilizing ect-aquasperm found nowhere else Animal Kingdom. Solenogastres fertilize internally introsperm like those described for Epimenia australis differ details length number specific components, providing insights to relationships them. Furthermore, solenogaster shares at least nine characters bilaterian lineage Nemertodermatida, none these sperm Caudofoveata, Polyplacophora (chitons), or Xenoturbellida few Acoela. However, recent re-analysis data points re-organization Xenacoelomorpha due Long Branch Attraction its into basal Nemertodermatida plus “Xenacoela” clade related Ambulacraria. If shared are plesiomorphies homoplasies, this would provide support phylogenies that place Mollusca. true, then Bilateria direct link Protostomia. Recent discoveries minute worm-like body trace fossils Ediacaran deposits suggest earliest bilaterians were meiofaunal preceded great Cambrian explosion millions years.

Language: Английский

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Distinctive spermiogenesis in Aplacophora (Mollusca) has phylogenetic implications

Zoomorphology, Journal Year: 2024, Volume and Issue: 144(1)

Published: Dec. 5, 2024

Language: Английский

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