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<taxonomicName id="EFFC46E6FFB9FFD19020109890E6FE94" ID-CoL="63V7" ID-ENA="646046" authority="Heller &amp; Snodgrass, 1903" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[859,961,178,201]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">Nexilosus</taxonomicName>
.
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<emphasis id="1A88E177FFB9FFD190BE109890FCFE94" bold="true" box="[965,987,178,201]" italics="true" pageId="25" pageNumber="283"></emphasis>
The single species of this genus is a benthic omnivore found in shallow, rocky areas of the temperate eastern Pacific (
<bibRefCitation id="4C6D4094FFB9FFD1976A10C497FEFF59" author="Hildebrand, S. F." box="[1041,1241,238,260]" pageId="25" pageNumber="283" pagination="1 - 530" refId="ref69174" refString="Hildebrand, S. F. 1946. A descriptive catalogue of the shore fishes of Peru. Bulletin of the United States National Museum 189: 1 - 530." type="journal article" year="1946">Hildebrand, 1946</bibRefCitation>
; Allen, 1991;
<bibRefCitation id="4C6D4094FFB9FFD196FB10C49734FF7C" author="Grove, J. S. &amp; R. J. Lavenberg" pageId="25" pageNumber="283" refId="ref68178" refString="Grove, J. S., and R. J. Lavenberg. 1997. The Fishes of the Galapagos Islands. Stanford University Press, Stanford, California." type="book" year="1997">Grove and Lavenberg, 1997</bibRefCitation>
; Angel and Ojeda, 2001; Aguilar-Medrano et al., 2011). In their description of the genus,
<bibRefCitation id="4C6D4094FFB9FFD1960411039706FF00" author="Heller, E. &amp; R. E. Snodgrass" pageId="25" pageNumber="283" pagination="189 - 229" refId="ref68889" refString="Heller, E., and R. E. Snodgrass. 1903. Papers from the Hopkins Stanford Galapagos Expedition, 1898 - 1899. XV. New fishes. Proceedings of the Washington Academy of Sciences 5: 189 - 229." type="journal article" year="1903">Heller and Snodgrass (1903)</bibRefCitation>
remarked that most of the diagnostic characters for
<taxonomicName id="EFFC46E6FFB9FFD19084114E9746FF27" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[1023,1121,356,378]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD19084114E9746FF27" box="[1023,1121,356,378]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
are shared with
<taxonomicName id="EFFC46E6FFB9FFD19652114F96B1FF27" authorityName="Gill" authorityYear="1861" box="[1321,1430,357,378]" class="Actinopterygii" family="Pomacentridae" genus="Hypsypops" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD19652114F96B1FF27" box="[1321,1430,357,378]" italics="true" pageId="25" pageNumber="283">Hypsypops</emphasis>
</taxonomicName>
. Despite its classification in the tribe
<taxonomicName id="EFFC46E6FFB9FFD197F611AB964CFFCA" box="[1165,1387,385,407]" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="tribe" tribe="Microspathodontini">Microspathodontini</taxonomicName>
(Cooper and Santini, 2016), the relationships of
<taxonomicName id="EFFC46E6FFB9FFD1978C11B4969DFFE9" baseAuthorityName="Tschudi" baseAuthorityYear="1846" box="[1271,1466,414,436]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="species" species="latifrons">
<emphasis id="1A88E177FFB9FFD1978C11B4969DFFE9" box="[1271,1466,414,436]" italics="true" pageId="25" pageNumber="283">Nexilosus latifrons</emphasis>
</taxonomicName>
were uncertain in Cooper et al. (2009), who only had access to DNA acquired from formalin-fixed samples. The few target loci that were successfully sequenced had fragmentary data. Although it appeared in a polytomy within
<taxonomicName id="EFFC46E6FFB9FFD1961D123F90E6FC15" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="300" phylum="Chordata" rank="subFamily" subFamily="Microspathodontinae">Microspathodontinae</taxonomicName>
, Cooper et al. (2009: 12) noted that molecular evidence for placing
<taxonomicName id="EFFC46E6FFB9FFD1973B12659785FC38" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[1088,1186,591,613]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD1973B12659785FC38" box="[1088,1186,591,613]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
in the damselfish tree is weak and its position was tentative. Cooper and Santini (2016) speculated that
<taxonomicName id="EFFC46E6FFB9FFD1976A12A09754FCFD" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[1041,1139,650,672]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD1976A12A09754FCFD" box="[1041,1139,650,672]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
is a member of their tribe
<taxonomicName id="EFFC46E6FFB9FFD196CA12A190DCFCE3" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="tribe" tribe="Microspathodontini">Microspathodontini</taxonomicName>
, based on its large adult size, cranial morphology, ecology, and distribution. All subsequent works that have examined
<taxonomicName id="EFFC46E6FFB9FFD1977312C9974DFCA4" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[1032,1130,739,761]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD1977312C9974DFCA4" box="[1032,1130,739,761]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
used Cooper et al.s (2009) data. The position of this genus has been unstable in those phylogenetic studies. Cowman and Bellwood (2011: fig. S6) resolved it in the Indo-West Pacific
<taxonomicName id="EFFC46E6FFB9FFD197EB131697CDFD0C" baseAuthorityName="sensu Emery and Allen" baseAuthorityYear="1980" box="[1168,1258,828,849]" class="Actinopterygii" family="Pomacentridae" genus="Stegastes" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD197EB131697CDFD0C" box="[1168,1258,828,849]" italics="true" pageId="25" pageNumber="283">Stegastes</emphasis>
</taxonomicName>
and not closely related to the putative genera of
<taxonomicName id="EFFC46E6FFB9FFD1970513739679FD32" box="[1150,1374,857,879]" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="305" phylum="Chordata" rank="tribe" tribe="Microspathodontini">Microspathodontini</taxonomicName>
;
<bibRefCitation id="4C6D4094FFB9FFD1961713739085FDD0" author="Lobato, F. L. &amp; D. R. Barneche &amp; A. C. Siqueira &amp; A. M. R. Liedke &amp; A. Lindner &amp; M. R. Pie &amp; D. R. Bellwood &amp; S. R. Floeter" pageId="25" pageNumber="283" pagination="102094" refId="ref72399" refString="Lobato, F. L., D. R. Barneche, A. C. Siqueira, A. M. R. Liedke, A. Lindner, M. R. Pie, D. R. Bellwood, and S. R. Floeter. 2014. Diet and diversification in the evolution of coral reef fishes. PLoS ONE 9: e 102094." type="journal article" year="2014">Lobato et al. (2014)</bibRefCitation>
and
<bibRefCitation id="4C6D4094FFB9FFD190A4135D97F3FDD0" author="Gaboriau, T. &amp; F. Leprieur &amp; D. Mouillot &amp; N. Hubert" box="[991,1236,886,909]" pageId="25" pageNumber="283" pagination="1295 - 1306" refId="ref67249" refString="Gaboriau, T., F. Leprieur, D. Mouillot, and N. Hubert. 2018. Influence of the geography of speciation on current patterns of coral reef fish biodiversity across the Indo-Pacific. Ecography 41: 1295 - 1306." type="journal article" year="2018">Gaboriau et al. (2018)</bibRefCitation>
reported similar findings.
<bibRefCitation id="4C6D4094FFB9FFD1902013BE9717FDF4" author="Litsios, G. &amp; C. A. Sims &amp; R. O. Wuest &amp; P. B. Pearman &amp; N. E. Zimmermann &amp; N. Salamin" box="[859,1072,916,938]" pageId="25" pageNumber="283" pagination="212" refId="ref72166" refString="Litsios, G., C. A. Sims, R. O. Wuest, P. B. Pearman, N. E. Zimmermann, and N. Salamin. 2012 a. Mutualism with sea anemones triggered the adaptive radiation of clownfishes. BMC Evolutionary Biology 12: 212." type="journal article" year="2012">Litsios et al. (2012a</bibRefCitation>
: fig. 2) found it in a clade with
<taxonomicName id="EFFC46E6FFB9FFD196F813BE90B9FD9A" baseAuthorityName="Allen" baseAuthorityYear="1973" class="Actinopterygii" family="Pomacentridae" genus="Chrysiptera" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="species" species="starcki">
<emphasis id="1A88E177FFB9FFD196F813BE90B9FD9A" italics="true" pageId="25" pageNumber="283">Chrysiptera starcki</emphasis>
</taxonomicName>
, sister to the remaining pomacentrines.
<bibRefCitation id="4C6D4094FFB9FFD1960B1398908BFDB8" author="Litsios, G. &amp; L. Pellissier &amp; F. Forest &amp; C. Lexer &amp; P. B. Pearman &amp; N. E. Zimmermann &amp; N. Salamin" pageId="25" pageNumber="283" pagination="3662 - 3669" refId="ref72070" refString="Litsios, G., L. Pellissier, F. Forest, C. Lexer, P. B. Pearman, N. E. Zimmermann, and N. Salamin. 2012 b. Trophic specialization influences the rate of environmental niche evolution in damselfishes (Pomacentridae). Proceedings of the Royal Society B: Biological Sciences 279: 3662 - 3669." type="journal article" year="2012">Litsios et al. (2012b</bibRefCitation>
: figs. A1, A2) recovered
<taxonomicName id="EFFC46E6FFB9FFD197C413E59606FDB8" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[1215,1313,975,997]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD197C413E59606FDB8" box="[1215,1313,975,997]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
either as the sister group of the
<taxonomicName id="EFFC46E6FFB9FFD1977613C7979FFA5E" box="[1037,1208,1005,1027]" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="300" phylum="Chordata" rank="subFamily" subFamily="Pomacentrinae">Pomacentrinae</taxonomicName>
or sister to
<taxonomicName id="EFFC46E6FFB9FFD1961E13C696FDFA5F" box="[1381,1498,1004,1026]" class="Actinopterygii" family="Pomacentridae" genus="Altrichthys" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD1961E13C696FDFA5F" box="[1381,1498,1004,1026]" italics="true" pageId="25" pageNumber="283">Altrichthys</emphasis>
</taxonomicName>
<emphasis id="1A88E177FFB9FFD1969213C196DCFA5F" bold="true" box="[1513,1531,1003,1026]" pageId="25" pageNumber="283">þ</emphasis>
<taxonomicName id="EFFC46E6FFB9FFD1902014209735FA7D" baseAuthorityName="Allen and Randall" baseAuthorityYear="1974" box="[859,1042,1034,1056]" class="Actinopterygii" family="Pomacentridae" genus="Chrysiptera" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="species" species="galba">
<emphasis id="1A88E177FFB9FFD1902014209735FA7D" box="[859,1042,1034,1056]" italics="true" pageId="25" pageNumber="283">Chrysiptera galba</emphasis>
</taxonomicName>
. DiBattista et al. (2016) recovered
<taxonomicName id="EFFC46E6FFB9FFD196EC142096DEFA7D" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[1431,1529,1034,1056]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD196EC142096DEFA7D" box="[1431,1529,1034,1056]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
inside
<emphasis id="1A88E177FFB9FFD190D3140D97ACFA60" box="[936,1163,1063,1085]" italics="true" pageId="25" pageNumber="283">
<taxonomicName id="EFFC46E6FFB9FFD190D3140D9765FA60" authorityName="Moyer and Ida" authorityYear="1976" box="[936,1090,1063,1085]" class="Actinopterygii" family="Pomacentridae" genus="Chromis" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="species" species="sensu">
Chromis
<taxonomicNameLabel id="01BB5C0CFFB9FFD1977114029765FA60" box="[1034,1090,1064,1085]" pageId="25" pageNumber="283" sensu="stricto">sensu</taxonomicNameLabel>
</taxonomicName>
stricto
</emphasis>
, sister to a group equivalent to
<taxonomicName id="EFFC46E6FFB9FFD19020146F9757FA06" box="[859,1136,1093,1115]" class="Actinopterygii" family="Pomacentridae" genus="Chromis" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="subGenus" subGenus="Thrissochromis">
<emphasis id="1A88E177FFB9FFD19020146F9095FA06" box="[859,946,1093,1115]" italics="true" pageId="25" pageNumber="283">Chromis</emphasis>
(
<emphasis id="1A88E177FFB9FFD190B1146F9741FA06" box="[970,1126,1093,1115]" italics="true" pageId="25" pageNumber="283">Thrissochromis</emphasis>
)
</taxonomicName>
. In Delrieu-Trottin et al. (2019),
<taxonomicName id="EFFC46E6FFB9FFD190201448909AFA25" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[859,957,1122,1144]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD190201448909AFA25" box="[859,957,1122,1144]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
is sister to
<taxonomicName id="EFFC46E6FFB9FFD1973414489798FA25" box="[1103,1215,1122,1144]" class="Actinopterygii" family="Pomacentridae" genus="Altrichthys" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD1973414489798FA25" box="[1103,1215,1122,1144]" italics="true" pageId="25" pageNumber="283">Altrichthys</emphasis>
</taxonomicName>
and together they are the sister taxon of the
<taxonomicName id="EFFC46E6FFB9FFD1975C14AA97EBFACB" box="[1063,1228,1152,1174]" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="300" phylum="Chordata" rank="subFamily" subFamily="Pomacentrinae">Pomacentrinae</taxonomicName>
minus
<taxonomicName id="EFFC46E6FFB9FFD1966514AA96E2FACB" authorityName="Whitley" authorityYear="1929" box="[1310,1477,1152,1174]" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="300" phylum="Chordata" rank="tribe" tribe="Cheiloprionini">Cheiloprionini</taxonomicName>
. The inconsistency in its phylogenetic position is probably due to the incomplete nature of the sequences, a basic problem with DNA extracted from formalin-preserved tissue (
<bibRefCitation id="4C6D4094FFB9FFD1960D14F2909AFB56" author="Shedlock, A. M. &amp; M. G. Haygood &amp; T. W. Pietsch &amp; P. Bentzen" pageId="25" pageNumber="283" pagination="394 - 400" refId="ref79201" refString="Shedlock, A. M., M. G. Haygood, T. W. Pietsch, and P. Bentzen. 1997. Enhanced DNA extraction and PCR amplification of mitochondrial genes from formalin-fixed museum specimens. BioTechniques 22: 394 - 400." type="journal article" year="1997">Shedlock et al., 1997</bibRefCitation>
;
<bibRefCitation id="4C6D4094FFB9FFD190B114DC963BFB56" author="Schander, C. &amp; K. M. Halanych" box="[970,1308,1270,1292]" pageId="25" pageNumber="283" pagination="195 - 205" refId="ref78965" refString="Schander, C., and K. M. Halanych. 2003. DNA, PCR and formalinized animal tissue - a short review and protocols. Organisms Diversity &amp; Evolution 3: 195 - 205." type="journal article" year="2003">Schander and Halanych, 2003</bibRefCitation>
; Chakraborty et al., 2006). Because of their ambiguous nature, we did not include those data. Instead, we analyzed a COI sequence of
<taxonomicName id="EFFC46E6FFB9FFD196EC151A9097FB39" baseAuthorityName="Tschudi" baseAuthorityYear="1846" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="species" species="latifrons">
<emphasis id="1A88E177FFB9FFD196EC151A9097FB39" italics="true" pageId="25" pageNumber="283">Nexilosus latifrons</emphasis>
</taxonomicName>
retrieved from the BOLD database (Sequence ID: LIDMA1248-12; Supplemental
<tableCitation id="657E08DEFFB9FFD197CC1546962FFBDC" box="[1207,1288,1388,1410]" captionStart="Table 1" captionStartId="2.[103,151,178,198]" captionTargetPageId="2" captionText="Table 1. Historical classifications of the damselfishes. Gill (1859) Family Pomacentroidae Subfamily Amphiprioninae Subfamily Pomacentrinae Bleeker (1877) Order Chromides Family Pomacentroidei Phalanx Glyphidodontini Subphalanx Chromidi Subphalanx Pomacentri Phalanx Prochilini Jordan and Evermann (1898) Order Acanthopteri Suborder Chromides Family Pomacentridae Subfamily Pomacentrinae Subfamily Microspathodontinae Fowler and Bean (1928) Family Pomacentridae Subfamily Chrominae Subfamily Pomacentrinae Subfamily Premninae McCulloch (1929) Order Amphiprioniformes Family Amphiprionidae Family Chromidae Family Pomacentridae Subfamily Glyphisodontinae Subfamily Parmidae Family Premnidae Whitley (1929) Order Amphiprioniformes Family Amphiprionidae Family Chromidae Family Pomacentridae Subfamily Cheiloprioninae Subfamily Glyphisodontinae Subfamily Hemiglyphidodontinae Subfamily Parminae Subfamily Pomacentrinae Family Premnidae Aoyagi (1941) Family Pomacentridae Subfamily Amphiprionidae Subfamily Chromidae Subfamily Pomacentrinae Subfamily Glyphisodontinae Subfamily Hemiglyphidodontinae Smith (1949) Order Chromides Family Abudefdufidae Family Amphiprionidae Norman (1957) Order Percomorphi Suborder Percoidea Division Pomacentriformes Family Pomacentridae Subfamily Amphiprioninae Subfamily Chrominae Subfamily Pomacentrinae Subfamily Premninae" pageId="25" pageNumber="283">Table 1</tableCitation>
; see Data Accessibility). Our results show that
<taxonomicName id="EFFC46E6FFB9FFD197F615A397C8FBC2" authorityName="Heller &amp; Snodgrass" authorityYear="1903" box="[1165,1263,1417,1439]" class="Actinopterygii" family="Pomacentridae" genus="Nexilosus" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">
<emphasis id="1A88E177FFB9FFD197F615A397C8FBC2" box="[1165,1263,1417,1439]" italics="true" pageId="25" pageNumber="283">Nexilosus</emphasis>
</taxonomicName>
is a member of
<taxonomicName id="EFFC46E6FFB9FFD196CA15A39730FBE0" class="Actinopterygii" family="Pomacentridae" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="300" phylum="Chordata" rank="subFamily" subFamily="Microspathodontinae">Microspathodontinae</taxonomicName>
, as the sister group of a
<emphasis id="1A88E177FFB9FFD19603158290FBFB87" italics="true" pageId="25" pageNumber="283">
<taxonomicName id="EFFC46E6FFB9FFD19603158296CBFBE0" authorityName="Gill" authorityYear="1861" box="[1400,1516,1448,1469]" class="Actinopterygii" family="Pomacentridae" genus="Hypsypops" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">Hypsypops</taxonomicName>
<taxonomicName id="EFFC46E6FFB9FFD1902015EE90FBFB87" authorityName="Hensley" authorityYear="1986" box="[859,988,1476,1498]" class="Actinopterygii" family="Pomacentridae" genus="Similiparma" kingdom="Animalia" order="Perciformes" pageId="25" pageNumber="283" phylum="Chordata" rank="genus">Similiparma</taxonomicName>
</emphasis>
clade, which supports recent classifications (Cooper et al., 2009; Cooper and Santini, 2016).
</paragraph>
</subSubSection>
</treatment>
</document>