{{Short description|Genus of eukaryotic microbes}} {{Speciesbox | image = | image_caption = | genus = Ancoracysta | parent_authority = Janouškovec, Tikhonenkov, Burki, Howe, Rohwer, Mylnikov & Keeling 2017<ref name="Janouškovec-2017"/> | species = twista | authority = Janouškovec, Tikhonenkov, Burki, Howe, Rohwer, Mylnikov & Keeling 2017<ref name="Janouškovec-2017"/> }}
'''''Ancoracysta''''' is a genus of eukaryotic microbes containing the species '''''Ancoracysta twista''''', a predatory protist.<ref name="Janouškovec-2017">{{cite journal | last1=Janouškovec | first1=Jan | last2=Tikhonenkov | first2=Denis V. | last3=Burki | first3=Fabien | last4=Howe | first4=Alexis T. | last5=Rohwer | first5=Forest L. | last6=Mylnikov | first6=Alexander P. | last7=Keeling | first7=Patrick J. | title=A New Lineage of Eukaryotes Illuminates Early Mitochondrial Genome Reduction | journal=Current Biology | volume=27 | issue=23 | date=2017 | doi=10.1016/j.cub.2017.10.051 | pages=3717–3724.e5}}</ref>
==Description== ''Ancoracysta twista'' was first described in November 2017 in ''Current Biology''. It was found in a sample collected from the surface of a tropical aquarium brain coral. It actively feeds on ''Procryptobia sorokini'', probably immobilising its prey through discharging a previously unknown type of extrusome named an ancoracyst.<ref name="Janouškovec-2017"/>
Genetic analysis shows that it is not closely related to any known lineage, but it may be most closely related to a grouping of haptophytes and centrohelids (Haptista). It is notable for having a gene-rich mitochondrial genome, the largest known outside the jakobids or ''Diphylleia rotans''. Uniquely, it appears to contain both the nucleus-encoded holocytochrome ''c'' synthase system III ''and'' the mitochondrion-encoded bacterial cytochrome ''c'' maturation system I.<ref name="Janouškovec-2017"/>
==Taxonomy== A 2018 study from Cavalier-Smith, Chao & Lewis created a new subphylum and subsequent lower taxonomic ranks for ''Ancoracysta twista''. They also created a new combination for ''Colponema marisrubri'' (Mylnikov & Tikhonenkov, 2009), which was shown to be ultrastructurally similar and phylogenetically close to ''A. twista'', thus renaming it ''A. marisrubri''.<ref name="Cavalier-Smith">{{citation | date=17 April 2018 | last1=Cavalier-Smith | first1=T. | last2=Chao | first2=E. E. |last3=Lewis | first3=R. |title =Multigene phylogeny and cell evolution of chromist infrakingdom Rhizaria: contrasting cell organisation of sister phyla Cercozoa and Retaria | volume= 255|issue= 5|pages=1517–1574 |journal=Protoplasma | doi= 10.1007/s00709-018-1241-1| pmid= 29666938| pmc=6133090}}</ref> This species was later placed into a new genus, ''Nebulomonas'', and is now called ''Nebulomonas marisrubri''.<ref name="Provora"/>
A 2022 study placed ''A. twista'' in a new supergroup Provora, closely related to other supergroups of Diaphoretickes such as Haptista, but no longer within Haptista.<ref name="Provora">{{cite journal |title=Microbial predators form a new supergroup of eukaryotes |year=2022 |last1=Tikhonenkov |first1=Denis V. |last2=Mikhailov |first2=Kirill V. |last3=Gawryluk |first3=Ryan M. R. |last4=Belyaev |first4=Artem O. |last5=Mathur |first5=Varsha |last6=Karpov |first6=Sergey A. |last7=Zagumyonnyi |first7=Dmitry G. |last8=Borodina |first8=Anastasia S. |last9=Prokina |first9=Kristina I. |last10=Mylnikov |first10=Alexander P. |last11=Aleoshin |first11=Vladimir V. |last12=Keeling |first12=Patrick J. |journal=Nature |volume=612 |issue=7941 |pages=714–719 |doi=10.1038/s41586-022-05511-5 |pmid=36477531|bibcode=2022Natur.612..714T |s2cid=254436650}}</ref>
==References== {{reflist}}
== External links == * {{cite journal|author=Katarina Zimme, Denis Tikhonenkov|url=https://www.the-scientist.com/the-nutshell/a-newly-identified-species-represents-its-own-eukaryotic-lineage-30601|title=A Newly Identified Species Represents Its Own Eukaryotic Lineage|journal=The Scientist|date=November 20, 2017}}
{{Taxonbar|from1=Q54287550|from2=Q47487266}}
Category:Protists described in 2017 Category:Protist genera Category:Diaphoretickes Category:Monotypic eukaryote genera