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<document ID-DOI="http://dx.doi.org/10.3897/zookeys.363.6482" ID-GBIF-Dataset="36e5551d-3881-45a2-810a-386e517c86fc" ID-PMC="PMC3867181" ID-Pensoft-Pub="1313-2970-363-1" ID-PubMed="24363601" ID-ZBK="780695A9CB2E4FECA0560BA6F456185E" ModsDocAuthor="" ModsDocDate="2013" ModsDocID="1313-2970-363-1" ModsDocOrigin="ZooKeys 363" ModsDocTitle="A revision of the shore-fly genus Hydrochasma Hendel (Diptera, Ephydridae)" checkinTime="1451246560986" checkinUser="pensoft" docAuthor="Mathis, Wayne N. &amp; Zatwarnicki, Tadeusz" docDate="2013" docId="217A497DB5A50AC3B17C25F2A720A1A0" docLanguage="en" docName="ZooKeys 363: 1-161" docOrigin="ZooKeys 363" docSource="http://dx.doi.org/10.3897/zookeys.363.6482" docTitle="Hydrochasma distinctum Mathis &amp; Zatwarnicki, 2013, sp. n." docType="treatment" docUuid="4A1D6F9C-A2C5-456A-9EE9-74BF61C84718" docUuidSource="ZooBank" docVersion="4" lastPageNumber="38" masterDocId="FFF2FFCA0333765855689824FFCDB839" masterDocTitle="A revision of the shore-fly genus Hydrochasma Hendel (Diptera, Ephydridae)" masterLastPageNumber="161" masterPageNumber="1" pageNumber="37" updateTime="1668157177207" updateUser="ExternalLinkService">
<mods:mods xmlns:mods="http://www.loc.gov/mods/v3">
<mods:titleInfo>
<mods:title>A revision of the shore-fly genus Hydrochasma Hendel (Diptera, Ephydridae)</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Mathis, Wayne N.</mods:namePart>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Zatwarnicki, Tadeusz</mods:namePart>
</mods:name>
<mods:typeOfResource>text</mods:typeOfResource>
<mods:relatedItem type="host">
<mods:titleInfo>
<mods:title>ZooKeys</mods:title>
</mods:titleInfo>
<mods:part>
<mods:date>2013</mods:date>
<mods:detail type="volume">
<mods:number>363</mods:number>
</mods:detail>
<mods:extent unit="page">
<mods:start>1</mods:start>
<mods:end>161</mods:end>
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<mods:location>
<mods:url>http://dx.doi.org/10.3897/zookeys.363.6482</mods:url>
</mods:location>
<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.363.6482</mods:identifier>
<mods:identifier type="Pensoft-Pub">1313-2970-363-1</mods:identifier>
<mods:identifier type="ZBK">780695A9CB2E4FECA0560BA6F456185E</mods:identifier>
<mods:identifier type="ZooBank">780695A9CB2E4FECA0560BA6F456185E</mods:identifier>
</mods:mods>
<treatment ID-GBIF-Taxon="152050165" LSID="urn:lsid:zoobank.org:act:4A1D6F9C-A2C5-456A-9EE9-74BF61C84718" httpUri="http://treatment.plazi.org/id/217A497DB5A50AC3B17C25F2A720A1A0" lastPageId="37" lastPageNumber="38" pageId="36" pageNumber="37">
<subSubSection pageId="36" pageNumber="37" type="nomenclature">
<paragraph pageId="36" pageNumber="37">
12.
<taxonomicName LSID="http://zoobank.org/4A1D6F9C-A2C5-456A-9EE9-74BF61C84718" class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma distinctum" order="Diptera" pageId="36" pageNumber="37" phylum="Arthropoda" rank="species" species="distinctum">Hydrochasma distinctum</taxonomicName>
<taxonomicNameLabel pageId="36" pageNumber="37">sp. n.</taxonomicNameLabel>
Figs 72-76
</paragraph>
</subSubSection>
<subSubSection pageId="36" pageNumber="37" type="diagnosis">
<paragraph pageId="36" pageNumber="37">Diagnosis.</paragraph>
<paragraph pageId="36" pageNumber="37">
This species is distinguished from congeners by the following combination of characters: Moderately small shore flies, body length 2.20 mm. Head: Antenna mostly dark gray; parafacial silvery white, concolorous with facial coloration; gena-to-eye ratio 0.13. Thorax: Wing with costal vein ratio 0.82; M vein ratio 0.51. Forefemur lacking a distinctive, comb-like row of stout setulae along anteroventral surface; tibiae mostly gray. Abdomen: Tergites 3 and 4 with wedge-shaped silvery-gray areas; otherwise, tergites dark brown to black. Male terminalia (Figs 72-75): Combined structures generally moderately compact and wide, in posterior view height 1.8
<normalizedToken originalValue="×">x</normalizedToken>
width, generally moderately setulose dorsally, setulae sparse or lacking ventrally; epandrium lacking dorsal arch above cerci, in posterior view (Fig. 72) with basal 2/3 rectangular, lateral margins of basal portion shallowly sinuous, ventral epandrial process conspicuously narrowed, tapered, each process digitiform, bifurcate apically with inverted V-shaped gap between, in lateral view (Fig. 73) much higher than wide, posterior margin arched, anterior margin with a midlength, shallow but elongate concavity, apex obtusely rounded; each ventral epandrial process with 2-3 dentate structures subapically; aedeagus in lateral view (Fig. 75) basically elongate, slender, tubular, tapered toward apex but with a large, somewhat quadrate structure at midlength, in ventral view (Fig. 74) elongate, slender, tubular, with quadrate structure at midlength, quadrate structure with basal margin shallow emarginate, apical margin with wide, shallow projection, truncate apically; phallapodeme in lateral view (Fig. 75) elongate, narrow, shallowly sinuous, keel as irregular, apical knob, in ventral view (Fig. 74) elongate, narrow, T-shaped, truncate at each end, basal half gradually expanded; gonite in lateral view (Fig. 75) a very shallowly sinuous, rod-like process, about 3/4 length of phallapodeme, in ventral view (Fig. 74) shallowly sinuous, bluntly rounded at both apices; hypandrium in lateral view (Fig. 75) narrowly developed, generally narrowly ovate, anterior margin moderately narrowly rounded, gradually tapered toward posterior margin, in ventral view (Fig. 74) longer than wide, more sclerotized and darker laterally, posterior margin widely emarginate, anterior margin membranous.
</paragraph>
<caption pageId="36" pageNumber="37">
<paragraph pageId="36" pageNumber="37">
Figures 72-75.
<taxonomicName class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma distinctum" order="Diptera" pageId="36" pageNumber="37" phylum="Arthropoda" rank="species" species="distinctum">Hydrochasma distinctum</taxonomicName>
sp. n. (Costa Rica.
<normalizedToken originalValue="Limón">Limon</normalizedToken>
: Parque Nacional Barbilla, Sector Casas Negras) 72 epandrium and cerci, posterior view 73 same, lateral view 74 internal structures of male terminalia (aedeagus [shaded], phallapodeme, gonite, hypandrium), ventral view 75 same, lateral view. Scale bar = 0.1 mm.
</paragraph>
</caption>
</subSubSection>
<subSubSection lastPageId="37" lastPageNumber="38" pageId="36" pageNumber="37" type="type material">
<paragraph pageId="36" pageNumber="37">Type material.</paragraph>
<paragraph lastPageId="37" lastPageNumber="38" pageId="36" pageNumber="37">
The holotype male of
<taxonomicName class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma distinctum" order="Diptera" pageId="37" pageNumber="38" phylum="Arthropoda" rank="species" species="distinctum">
<pageBreakToken pageId="37" pageNumber="38" start="start">Hydrochasma</pageBreakToken>
distinctum
</taxonomicName>
is labeled &quot;COSTA RICA. Prov.
<normalizedToken originalValue="Limón">Limon</normalizedToken>
. P[arque]. N[acional]. Barbilla, Sector Casas Negra, 1.5 Km NO[RTH] de la
<normalizedToken originalValue="Estación">Estacion</normalizedToken>
, 300m, 13 JUL 2002, E. Rojas, Libre, L_N_ 219900_598400 #70494/INB0003513948 INBIOCRI COSTA RICA [plastic bar code label]/HOLOTYPE ♂
<taxonomicName class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma distinctum" order="Diptera" pageId="37" pageNumber="38" phylum="Arthropoda" rank="species" species="distinctum">Hydrochasma distinctum</taxonomicName>
Mathis &amp; Zatwarnicki, USNM [red].&quot; The holotype is double mounted (minuten in a block of plastic), is in good condition (some setae of the head are misoriented or missing; abdomen removed and dissected), and is deposited in INBio.
</paragraph>
</subSubSection>
<subSubSection pageId="37" pageNumber="38" type="type locality">
<paragraph pageId="37" pageNumber="38">Type locality.</paragraph>
<paragraph pageId="37" pageNumber="38">
Costa Rica.
<normalizedToken originalValue="Limón">Limon</normalizedToken>
: Parque Nacional Barbilla, Sector Casas Negras, (
<geoCoordinate direction="north" orientation="latitude" precision="92" value="10.013333">10°0.8'N</geoCoordinate>
,
<geoCoordinate direction="west" orientation="longitude" precision="92" value="-83.46833">83°28.1'W</geoCoordinate>
; 300 m).
</paragraph>
</subSubSection>
<subSubSection pageId="37" pageNumber="38" type="distribution">
<paragraph pageId="37" pageNumber="38">Distribution</paragraph>
<paragraph pageId="37" pageNumber="38">
(Fig. 76). Neotropical: Costa Rica (
<normalizedToken originalValue="Limón">Limon</normalizedToken>
).
</paragraph>
<caption pageId="37" pageNumber="38">
<paragraph pageId="37" pageNumber="38">
Figure 76. Distribution of
<taxonomicName class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma distinctum" order="Diptera" pageId="37" pageNumber="38" phylum="Arthropoda" rank="species" species="distinctum">Hydrochasma distinctum</taxonomicName>
sp. n. and
<taxonomicName class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma dolabrutum" order="Diptera" pageId="37" pageNumber="38" phylum="Arthropoda" rank="species" species="dolabrutum">Hydrochasma dolabrutum</taxonomicName>
sp. n.
</paragraph>
</caption>
</subSubSection>
<subSubSection pageId="37" pageNumber="38" type="etymology">
<paragraph pageId="37" pageNumber="38">Etymology.</paragraph>
<paragraph pageId="37" pageNumber="38">The species epithet, distinctum, is of Latin derivation and means separate or different, referring to the unique and distinct structures of the male terminalia.</paragraph>
</subSubSection>
<subSubSection pageId="37" pageNumber="38" type="remarks">
<paragraph pageId="37" pageNumber="38">Remarks.</paragraph>
<paragraph pageId="37" pageNumber="38">
Thus far, this species is known only by the holotype male. As implied by its
<normalizedToken originalValue="species">species'</normalizedToken>
name, distinctum, this species is readily distinguished from congeners by the distinctive structures of the male terminalia, which are unique among congeners. The shape of the epandrium with a somewhat large and rectangular base and the short, tapered, ventral epandrial processes that bear tooth-like structures subapically are unique, as is the aedeagus that has a relatively large, quadrate structure at its midlength. Only
<taxonomicName class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma denticum" order="Diptera" pageId="37" pageNumber="38" phylum="Arthropoda" rank="species" species="denticum">Hydrochasma denticum</taxonomicName>
, which also has subapical tooth-like structures on the ventral epandrial processes, is similar. The ventral epandrial processes of
<taxonomicName class="Insecta" family="Ephydridae" genus="Hydrochasma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Hydrochasma denticum" order="Diptera" pageId="37" pageNumber="38" phylum="Arthropoda" rank="species" species="denticum">Hydrochasma denticum</taxonomicName>
, however, are much longer than their base, the aedeagus does not have a quadrate structure at its midlength, and the hypandrium is V-shaped.
</paragraph>
</subSubSection>
</treatment>
</document>