Patricia Cabezas

Georgetown University

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Nicolas Walter

University of Kaiserslautern

Petra Rettberg

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

Francès Westall

Centre de Biophysique Moléculaire

Elke Rabbow

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

Ricardo Amils

Centro de Biología Molecular Severo Ochoa

E. Monaghan

Leiden University

Pauline Vannier

Matís (Iceland)

P. Ehrenfreund

Leiden University

L. García-Descalzo

Centro de Astrobiología

Christine Moissl‐Eichinger

Medical University of Graz

Cooperative Institutions

Consejo Superior de Investigaciones Científicas

Centre National de la Recherche Scientifique

Max Planck Institute for Astronomy

Max Planck Society

Smithsonian Institution

Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR)

Harvard University

Museo Nacional de Ciencias Naturales

Université d'Orléans

Search for Extraterrestrial Intelligence

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Development and characterization of microsatellite markers for the endangered anchialine squat lobster Munidopsis polymorpha

Conservation Genetics (2008)

Patricia Cabezas Paul Bloor Iván Acevedo C. Toledo Marta Calvo

Endemism

10.1007/s10592-008-9611-4

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Citations (7)

Two new species of the deep-sea squat lobster genus Munida Leach, 1820 (Crustacea: Decapoda: Munididae) from Taiwan: morphological and molecular evidence

Zootaxa (2011)

Patricia Cabezas Chia-Wei Lin Tin‐Yam Chan

The genus Munida Leach, 1820 is the most diverse group within the squat lobsters, with approximately 250 described species. The extreme morphological similarity among certain species makes very difficult to identify diagnostic characters, and the real diversity of the group is probably underestimated. Here, two new species of the genus Munida from Taiwan previously identified as M. distiza Macpherson, 1994 and M. militaris Henderson, 1885, respectively, are described and illustrated. The two species are identified by subtle and constant morphological differences, which match clear molecular divergences in the 16S and COI genes. These results confirm the taxonomic value of slight morphological differences, and emphasize the need for more detailed analysis to clarify the phylogenetic relationships within the genus.

Anomura

10.11646/zootaxa.3036.1.2

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Citations (14)

Lost Branches on the Tree of Life

PLoS Biology (2013)

Bryan T. Drew Romina Gazis Patricia Cabezas Kristen S. Swithers Jiabin Deng

Failure to archive published data can impede reproducibility and inhibit downstream synthesis. Alarmingly, we estimate that ∼70% of existing DNA sequence alignments/phylogenetic trees, representing much of the underpinning of modern phylogenetic analysis, are no longer accessible. The evolutionary biology community needs to adopt policies ensuring that data are publicly archived upon publication.

Underpinning

Tree (set theory)

Sequence (biology)

10.1371/journal.pbio.1001636

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Citations (79)

Morphological and molecular description of new species of squat lobster (Crustacea: Decapoda: Galatheidae) from the Solomon and Fiji Islands (South-West Pacific)

Zoological Journal of the Linnean Society (2009)

Patricia Cabezas Enrique Macpherson Annie Machordom

The family Galatheidae is among the most diverse families of anomuran decapod crustaceans, and the South-West Pacific is a biodiversity hot spot for these squat lobsters. Attempts to clarify the taxonomic and evolutionary relationships of the Galatheidae on the basis of morphological and molecular data have revealed the existence of several cryptic species, differentiated only by subtle morphological characters. Despite these efforts, however, relationships among genera are poorly understood, and the family is in need of a detailed systematic review. In this study, we assess material collected in different surveys conducted in the Solomon Islands, as well as comparcaative material from the Fiji Islands, by examineding both the morphology of the specimens and two mitochondrial markers (cytochrome oxidase subunit I, COI, and 16S rRNA). These two sources of data revealed the existence of eight new species of squat lobster, four of which were ascribed to the genus Munida, two to the genus paramunida, one to the genus Plesionida, and the last species was ascribed to the genus Agononida. These eight species are described along with phylogenetic relationships at the genus level. Our findings support the taxonomic status of the new species, yet the phylogenetic relationships are not yet fully resolved. Further molecular analysis of a larger data set of species, and more conserved genes, will help clarify the systematics of this group.

Anomura

Molecular Phylogenetics

Species complex

10.1111/j.1096-3642.2008.00492.x

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Citations (37)

PLANETARY PROTECTION OF OUTER SOLAR SYSTEM

Nicolas Walter Patricia Cabezas Petra Rettberg Jean-Louis Fellous Jean-Jacques Tortora

The PPOSS project (Planetary Protection of Outer Solar System) is an initiative supported by the European Commission under the Horizon 2020 programme. PPOSS focuses on planetary protection of outer solar bodies, in particular icy moons, and tackles scientific, technological and policy-making challenges raised by this topic. This intensive three year programme will provide an international platform and forum where science, industry and policy actors will meet to nurture and catalyse discussions, exchange of knowledge and produce policy recommendations on the matter of planetary protection. Space exploration missions are international endeavours and planetary protection is by nature an issue of global relevance. Thus, the PPOSS project will promote international cooperation bringing partners and observers from non-European countries.

European commission

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A comprehensive and integrative reconstruction of evolutionary history for Anomura (Crustacea: Decapoda)

BMC Evolutionary Biology (2013)

Heather D. Bracken‐Grissom Maren E. Cannon Patricia Cabezas Rodney M. Feldmann Carrie E. Schweitzer

The infraorder Anomura has long captivated the attention of evolutionary biologists due to its impressive morphological diversity and ecological adaptations. To date, 2500 extant species have been described but phylogenetic relationships at high taxonomic levels remain unresolved. Here, we reconstruct the evolutionary history—phylogeny, divergence times, character evolution and diversification—of this speciose clade. For this purpose, we sequenced two mitochondrial (16S and 12S) and three nuclear (H3, 18S and 28S) markers for 19 of the 20 extant families, using traditional Sanger and next-generation 454 sequencing methods. Molecular data were combined with 156 morphological characters in order to estimate the largest anomuran phylogeny to date. The anomuran fossil record allowed us to incorporate 31 fossils for divergence time analyses. Our best phylogenetic hypothesis (morphological + molecular data) supports most anomuran superfamilies and families as monophyletic. However, three families and eleven genera are recovered as para- and polyphyletic. Divergence time analysis dates the origin of Anomura to the Late Permian ~259 (224–296) MYA with many of the present day families radiating during the Jurassic and Early Cretaceous. Ancestral state reconstruction suggests that carcinization occurred independently 3 times within the group. The invasion of freshwater and terrestrial environments both occurred between the Late Cretaceous and Tertiary. Diversification analyses found the speciation rate to be low across Anomura, and we identify 2 major changes in the tempo of diversification; the most significant at the base of a clade that includes the squat-lobster family Chirostylidae. Our findings are compared against current classifications and previous hypotheses of anomuran relationships. Many families and genera appear to be poly- or paraphyletic suggesting a need for further taxonomic revisions at these levels. A divergence time analysis provides key insights into the origins of major lineages and events and the timing of morphological (body form) and ecological (habitat) transitions. Living anomuran biodiversity is the product of 2 major changes in the tempo of diversification; our initial insights suggest that the acquisition of a crab-like form did not act as a key innovation.

Anomura

Monophyly

Polyphyly

Molecular Phylogenetics

Synapomorphy

10.1186/1471-2148-13-128

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Citations (150)

Preservation and detection of biomarkers in mineralized communities and its potential link to the variations in ORP

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

L. García-Descalzo Felipe Gómez S. Cockell C.Petra Schwendner Francès Westall

1. Introduction Physic-chemical processes of living organisms leave tell-tale signals in the environment. The search for these signatures is one of the main goals for Astrobiology and improving and optimizing its detection regarding Mars conditions is part of the MASE project objectives. Besides, the traces of some kinds of microorganisms can be well preserved, provided that they are rapidly mineralized and that the sediments in which they occur are rapidly cemented [1]. A developed antibody multiarray competitive immunoassay (MACIA) for the simultaneous detection of compounds of a wide range of molecular sizes or whole spores and cells [2] [3] is a suitable option for biomarker detection in samples with low biomass from Mars analogue sites as well as with biomineralized microorganism communi- ties. Moreover, biomineralization is often the first step of fossilization and produces particular chemical, structural and morphological features that can be preserved in fossil biominerals or microfossils [4] and some parameters as oxido-reduction potencial (ORP) or pH vary over the process. 2. Methods and objectives Samples from the three MASE campaigns in Iceland (Graenavatn Lake), United Kingdom (Boulby Mine) and Germany (Sippenauer Moor, Regensburg) and other one from an Alpin glacier were used to obtain enrichments and isolates as well as to extract and detect biomarkers in them. Some of the enrichments were exposed to mineralization to study, among others, the preservation of biosignatures by the assessment of antigen-antibody binding at different times. Simultaneously, the evolution of ORP through this process was monitored by two modules system (DTIVA: automated tools for microbial life detection) where ORP variations in those communities were followed through continuous measurements of nanosensors in closed chambers. An additional objective for MASE project is to develop a specific microarray with antibodies performanced from natural samples and isolates from MASE sampling sites. 3. Summary and Conclusions The presence of traces from some microbial metabolic groups were detected in the mineralized communities at three different times over the fossilization process. It was undertaken by us- ing a 168 antibody microarray for the immunoassay. There were observed variations in the resulting immunoprofiles. There seems to be a probably correlation between these changes and those in ORP through time. We consider that the simultaneous use of both approaches arises a promising tool to broaden our knowledge and improve the search for traces of life, present or past. Acknowledgements MASE is supported by European Community’s Seventh Framework Programme (FP7/2007-2013) under Grant Agreement n° 607297.

Life on Mars

Fossilization

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Dissemination and Communication Activities for Mars Analogues Research – The European MASE project

HAL (Le Centre pour la Communication Scientifique Directe) (2017)

Patricia Cabezas Nicolas Walter Petra Rettberg Maria Bohmeier Elke Rabbow

Introduction: The Mars Analogues for Space Ex-ploration (MASE) project is brining new insight about Mars potential habitability but also some new knowledge about Earth organisms and the functioning of extreme terrestrial ecosystems. The overall aim of the MASE project is to study a variety of Mars-like environments in order to further our understanding of Martian habitability, as well as our ability to detect organisms that might be present on Mars. This collabo-rative, 4 research project supported by the European Commission’s Seventh Framework Programme has been running since January 2014 and a variety of dis-semination and communication activities has been per-formed since then to increase visibility of Mars ana-logues research.

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Mars Analogues for space exploration - from anaerobicfield site to culture collection

Charles S. Cockell Petra Schwendner Petra Rettberg Kristina Beblo‐Vranesevic Maria Bohmeier

Astrobiology seeks to understand the limits of life and to determine the physiology of organisms in order to be able to better assess the potential habitability of other worlds and improve our ability to assay them for the presence of life. To successfully achieve this we require representative microorganisms from environments on Earth that in physical and/or chemical conditions approximate to extraterrestrial environments. The most challenging of these environments with respect to the sample collection and follow on isolation and cultivation of microorganisms are anaerobic environments. Here we describe a systematic approach to this challenge and aim to provide a guideline for future fieldwork and sampling campaigns. We selected a number of anaerobic environments based on characteristics that make them analogous to past and present locations on Mars (Icelandic lakes, sulfidic springs, deep hypersaline environments, acidic iron-rich environments, and permafrost). We implemented a culturing approach to enrich organisms from these environments under anaerobic conditions using a defined medium that would allow for all organisms to be grown under identical culturing conditions m future physiological comparisons. We then isolated anaerobic microorganisms, carried out a study of their basic physiology and deposited these organisms in the DSMZ (Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH) culture collection to make them available to astrobiologists and microbiologists. This project represents the first attempt to implement a coordinated effort from the selection of extraterrestrial analog sites through to the isolation and the characterisation of organisms and their deposition within a culture collection.

Habitability

Extraterrestrial Life

Life on Mars

Isolation

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Evolution of squat lobsters (Crustacea, Galatheoidea): mitogenomic data suggest an early divergent Porcellanidae

Hydrobiologia (2019)

Ferran Palero Paula C. Rodríguez‐Flores Patricia Cabezas Annie Machordom Enrique Macpherson

Anomura

10.1007/s10750-019-3898-7

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Citations (7)