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<document ID-DOI="http://dx.doi.org/10.3897/zookeys.640.10674" ID-GBIF-Dataset="346ad9d3-d37c-4b95-8dc2-40499aafaa82" ID-PMC="PMC5240362" ID-Pensoft-Pub="1313-2970-640-1" ID-PubMed="28138282" ID-ZBK="B4EA1C647EBB4B89B46A360A9CCB11DB" ModsDocAuthor="" ModsDocDate="2016" ModsDocID="1313-2970-640-1" ModsDocOrigin="ZooKeys 640" ModsDocTitle="Myrtoessahyas, a new valvatiform genus and a new species of the Hydrobiidae (Caenogastropoda, Truncatelloidea) from Greece" checkinTime="1481701933811" checkinUser="pensoft" docAuthor="Radea, Canella, Parmakelis, Aristeidis &amp; Giokas, Sinos" docDate="2016" docId="C2BAB2F14E1776CE0CCF6D54FFE14D13" docLanguage="en" docName="ZooKeys 640: 1-18" docOrigin="ZooKeys 640" docSource="http://dx.doi.org/10.3897/zookeys.640.10674" docTitle="Myrtoessa hyas Radea, sp. n." docType="treatment" docUuid="4811DC7A-037A-4D3A-9F02-36F5F3B2A2BF" docUuidSource="ZooBank" docVersion="6" lastPageNumber="9" masterDocId="FF948C18BE108D0A152FFFEFFFC9FFA7" masterDocTitle="Myrtoessahyas, a new valvatiform genus and a new species of the Hydrobiidae (Caenogastropoda, Truncatelloidea) from Greece" masterLastPageNumber="18" masterPageNumber="1" pageNumber="5" updateTime="1668163798470" updateUser="ExternalLinkService">
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<mods:titleInfo>
<mods:title>Myrtoessahyas, a new valvatiform genus and a new species of the Hydrobiidae (Caenogastropoda, Truncatelloidea) from Greece</mods:title>
</mods:titleInfo>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Radea, Canella</mods:namePart>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Parmakelis, Aristeidis</mods:namePart>
</mods:name>
<mods:name type="personal">
<mods:role>
<mods:roleTerm>Author</mods:roleTerm>
</mods:role>
<mods:namePart>Giokas, Sinos</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>2016</mods:date>
<mods:detail type="volume">
<mods:number>640</mods:number>
</mods:detail>
<mods:extent unit="page">
<mods:start>1</mods:start>
<mods:end>18</mods:end>
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<mods:location>
<mods:url>http://dx.doi.org/10.3897/zookeys.640.10674</mods:url>
</mods:location>
<mods:classification>journal article</mods:classification>
<mods:identifier type="DOI">http://dx.doi.org/10.3897/zookeys.640.10674</mods:identifier>
<mods:identifier type="Pensoft-Pub">1313-2970-640-1</mods:identifier>
<mods:identifier type="ZBK">B4EA1C647EBB4B89B46A360A9CCB11DB</mods:identifier>
<mods:identifier type="ZooBank">B4EA1C647EBB4B89B46A360A9CCB11DB</mods:identifier>
</mods:mods>
<treatment ID-GBIF-Taxon="127877251" LSID="urn:lsid:zoobank.org:act:4811DC7A-037A-4D3A-9F02-36F5F3B2A2BF" httpUri="http://treatment.plazi.org/id/C2BAB2F14E1776CE0CCF6D54FFE14D13" lastPageId="8" lastPageNumber="9" pageId="4" pageNumber="5">
<subSubSection pageId="4" pageNumber="5" type="nomenclature">
<paragraph pageId="4" pageNumber="5">
<taxonomicName LSID="http://zoobank.org/4811DC7A-037A-4D3A-9F02-36F5F3B2A2BF" authority="Radea" class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="4" pageNumber="5" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas Radea</taxonomicName>
<taxonomicNameLabel pageId="4" pageNumber="5">sp. n.</taxonomicNameLabel>
Figs 2, 3, 4, 5, 6, 7
</paragraph>
</subSubSection>
<subSubSection pageId="4" pageNumber="5" type="type-locality">
<paragraph pageId="4" pageNumber="5">Type-locality.</paragraph>
<paragraph pageId="4" pageNumber="5">
Poulithra, Peloponnese, Greece,
<geoCoordinate direction="north" orientation="latitude" precision="9" value="36.1105">36°6.63'N</geoCoordinate>
,
<geoCoordinate direction="east" orientation="longitude" precision="9" value="22.892166">22°53.53'E</geoCoordinate>
, 70 m a.s.l, stream, 12/IV/2014, C. Radea, G. Tryfonopoulos legs.
</paragraph>
</subSubSection>
<subSubSection pageId="4" pageNumber="5" type="diagnosis">
<paragraph pageId="4" pageNumber="5">Diagnosis.</paragraph>
<paragraph pageId="4" pageNumber="5">As for genus.</paragraph>
</subSubSection>
<subSubSection pageId="4" pageNumber="5" type="etymology">
<paragraph pageId="4" pageNumber="5">Etymology.</paragraph>
<paragraph pageId="4" pageNumber="5">The specific name (in apposition) derives from the Greek mythology: Hyas, (Υάς in Greek), was one of the seven nymphs Hyades (Υάδες in Greek) bringing humidity and rain, daughters of Atlas and Pleione.</paragraph>
</subSubSection>
<subSubSection pageId="4" pageNumber="5" type="type material">
<paragraph pageId="4" pageNumber="5">Type material.</paragraph>
<paragraph pageId="4" pageNumber="5">Holotype. Ethanol-fixed specimen, ZMUA 4183.</paragraph>
<paragraph pageId="4" pageNumber="5">Paratypes. Two ethanol-fixed specimens, ZMUA 4184. Ten ethanol-fixed specimens dissected for anatomical study and four specimens coated for SEM, the remaining in the personal collection of C. Radea deposited in the Department of Ecology &amp; Systematics, UOA.</paragraph>
</subSubSection>
<subSubSection pageId="4" pageNumber="5" type="materials_examined">
<paragraph pageId="4" pageNumber="5">Other material examined.</paragraph>
<paragraph pageId="4" pageNumber="5">Ten specimens, collected from the type locality, Th. Constantinidis, E. Kalpoutzakis legs, 25/IV/2014, in the personal collection of C. Radea deposited in the Department of Ecology &amp; Systematics, UOA.</paragraph>
</subSubSection>
<subSubSection lastPageId="8" lastPageNumber="9" pageId="4" pageNumber="5" type="description">
<paragraph pageId="4" pageNumber="5">Description.</paragraph>
<paragraph lastPageId="5" lastPageNumber="6" pageId="4" pageNumber="5">
Shell (Fig. 2
<normalizedToken originalValue="AI">A-I</normalizedToken>
). Colourless valvatiform shell with up to 3.5 whorls, thin, transparent when fresh, therefore possible to follow the position of rectum; spire more or less depressed; whorls rounded, regularly growing with shallow sutures. Measurements are given in Table 1. Periostracum cream-coloured; aperture adhering to the last whorl, prosocline, roundish to ovate; peristome continuous, thickened at columel
<pageBreakToken pageId="5" pageNumber="6" start="start">lar</pageBreakToken>
margin, reflected at columellar margin, the outer margin simple; umbilicus open, deep, wide so that the first whorls can be seen through it, sometimes partially covered by the collumelar margin of aperture (Figs 2F, G, 3B); protoconch microsculpture composed of a dense net of irregularly shaped depressions (Fig. 3A, C, D). The number of protoconch whorls is 1.25. The width of nucleus and protoconch is 102
<normalizedToken originalValue="µm">µm</normalizedToken>
and 262
<normalizedToken originalValue="µm">µm</normalizedToken>
, respectively.
</paragraph>
<caption pageId="5" pageNumber="6">
<paragraph pageId="5" pageNumber="6">
Figure 2. Shells of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="5" pageNumber="6" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n., sp. n.
<normalizedToken originalValue="AE">A-E</normalizedToken>
Dorsal view
<normalizedToken originalValue="FG">F-G</normalizedToken>
Ventral view H-I Lateral view. Scale bar 1 mm.
</paragraph>
</caption>
<caption pageId="5" pageNumber="6">
<paragraph pageId="5" pageNumber="6">
Figure 3. Scanning electron micrographs of shell, protoconch and operculum of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="5" pageNumber="6" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n., sp. n.
<normalizedToken originalValue="AB">A-B</normalizedToken>
Shell dorsal and ventral view respectively C Shell apex showing protoconch D Close up of protoconch E Operculum, outer side F Operculum, inner side. Scale bars
<normalizedToken originalValue="AD">A-D</normalizedToken>
200
<normalizedToken originalValue="µm">µm</normalizedToken>
,
<normalizedToken originalValue="EF">E-F</normalizedToken>
100
<normalizedToken originalValue="µm">µm</normalizedToken>
.
</paragraph>
</caption>
<caption pageId="5" pageNumber="6">
<paragraph pageId="5" pageNumber="6">
Table 1. Shell morphometry of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="5" pageNumber="6" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n., sp. n. Measurements are in mm. Abbreviations are given in the materials and methods.
</paragraph>
</caption>
<paragraph pageId="5" pageNumber="6">
<table pageId="5" pageNumber="6">
<tr pageId="5" pageNumber="6">
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">Type locality</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0EDYAE" pageId="5" pageNumber="6">Sh</abbrev>
</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0EMYAE" pageId="5" pageNumber="6">Sw</abbrev>
</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0EVYAE" pageId="5" pageNumber="6">Ah</abbrev>
</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0E5YAE" pageId="5" pageNumber="6">Aw</abbrev>
</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0EHZAE" pageId="5" pageNumber="6">Sh</abbrev>
/
<abbrev content-type="shell character" id="ABBRID0EMZAE" pageId="5" pageNumber="6">Sw</abbrev>
</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0EUZAE" pageId="5" pageNumber="6">Ah</abbrev>
/
<abbrev content-type="shell character" id="ABBRID0EZZAE" pageId="5" pageNumber="6">Aw</abbrev>
</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0EB1AE" pageId="5" pageNumber="6">Sh</abbrev>
/
<abbrev content-type="shell character" id="ABBRID0EG1AE" pageId="5" pageNumber="6">Ah</abbrev>
</th>
<th colspan="1" pageId="5" pageNumber="6" rowspan="1">
<abbrev content-type="shell character" id="ABBRID0EO1AE" pageId="5" pageNumber="6">Sw</abbrev>
/
<abbrev content-type="shell character" id="ABBRID0ET1AE" pageId="5" pageNumber="6">Aw</abbrev>
</th>
</tr>
<tr pageId="5" pageNumber="6">
<td colspan="1" pageId="5" pageNumber="6" rowspan="1">Min</td>
</tr>
<tr pageId="5" pageNumber="6">
<td colspan="1" pageId="5" pageNumber="6" rowspan="4">N</td>
<td colspan="1" pageId="5" pageNumber="6" rowspan="1">Max</td>
</tr>
<tr pageId="5" pageNumber="6">
<td colspan="1" pageId="5" pageNumber="6" rowspan="1">x</td>
</tr>
<tr pageId="5" pageNumber="6">
<td colspan="1" pageId="5" pageNumber="6" rowspan="1">SD</td>
</tr>
</table>
</paragraph>
<paragraph pageId="5" pageNumber="6">Operculum (Fig. 3E, F). Operculum ovate, thin, corneous, paucispiral, yellowish-orange, darker at the nucleus, with weakly convex inner face without any peg, nucleus sub-central.</paragraph>
<paragraph lastPageId="6" lastPageNumber="7" pageId="5" pageNumber="6">
Soft body pigmentation (Fig. 2
<normalizedToken originalValue="AI">A-I</normalizedToken>
). Soft body pigmentation of alive specimens extremely variable, the colouration being visible under the transparent shell; many specimens almost totally unpigmented with only a few traces of pigments on walls of visceral sac, several specimens grey pigmented and some others dark grey pigmented; in the last two cases, tentacles with a median grey stripe and snout with grey areas
<pageBreakToken pageId="6" pageNumber="7" start="start">laterally</pageBreakToken>
and around eyes; snout longer than wide, parallel-sided with medium distal lobation; eye spots present; tentacles about six times as long as wide (in specimens preserved in ethanol solution 70%).
</paragraph>
<paragraph pageId="6" pageNumber="7">Nervous system (Fig. 4A). Cerebral ganglia of the same size, white-coloured; supraoesophageal and suboesophageal ganglia of the same size, smaller than cerebral ganglia, white-coloured; supraoesophageal connective about equal to suboesophageal connective; mean RPG ratio 0.39 (three specimens), nervous moderately concentrated.</paragraph>
<caption pageId="6" pageNumber="7">
<paragraph pageId="6" pageNumber="7">
Figure 4. Nervous system and female genitalia of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="6" pageNumber="7" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n., sp. n. A Nervous system
<normalizedToken originalValue="BC">B-C</normalizedToken>
Female genitalia. Scale bar 0.25 mm. Abbreviations are given in the Material and Method section.
</paragraph>
</caption>
<paragraph pageId="6" pageNumber="7">Ctenidium-Osphradium. Ctenidium with ca 5-7 long lamellae. Osphradium of intermediate width, opposite posterior part of ctenidium.</paragraph>
<paragraph lastPageId="7" lastPageNumber="8" pageId="6" pageNumber="7">
<taxonomicName class="Bivalvia" family="Limidae" genus="Radula" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Radula" order="Limida" pageId="6" pageNumber="7" phylum="Mollusca" rank="genus">Radula</taxonomicName>
(Fig. 5). Central tooth trapezoidal, dorsal edge of tooth strongly concave; one pair of medium-sized basal cusps (bc2), basal tongue broadly V-shaped and about equal to lateral margin; median cusp blunt, protruding, broader and longer than laterals, 5 lateral cusps on each side of median cusp, the latter one not well defined (Fig. 5A, B); lateral tooth face taller than wider, basal tongue well developed; outer wing moderately flexed; cutting edge much shorter than outer wing; central cusp longer than lateral cusps, 5 lateral cusps on outer side, 4-5 on inner side (Fig. 5C); inner marginal
<pageBreakToken pageId="7" pageNumber="8" start="start">tooth</pageBreakToken>
with ca. 24-28 long almost equal in size cusps; outer marginal tooth with ca. 27 cusps (Fig. 5D).
</paragraph>
<caption pageId="7" pageNumber="8">
<paragraph pageId="7" pageNumber="8">
Figure 5. Scanning electron micrographs of radula of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="7" pageNumber="8" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n., sp. n. A Portion of radular ribbon B Central teeth C Lateral teeth D Inner and outer marginal teeth. Scale bars 10
<normalizedToken originalValue="µm">µm</normalizedToken>
.
</paragraph>
</caption>
<paragraph pageId="7" pageNumber="8">Digestive system apart from radula (Fig. 6). Style sac smaller than stomach, not protruding to the intestinal loop (Fig. 6A); rectum V-shaped, V being wider in female specimens (Fig. 6B).</paragraph>
<caption pageId="7" pageNumber="8">
<paragraph pageId="7" pageNumber="8">
Figure 6. Digestive system (apart from the radula) of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="7" pageNumber="8" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n., sp. n. A Stomach, style sac, part of intestine and oesophagous B Rectum. Scale bar 0.5 mm. Abbreviations are given in the Material and method section.
</paragraph>
</caption>
<paragraph lastPageId="8" lastPageNumber="9" pageId="7" pageNumber="8">
Male reproductive system (Fig. 7
<normalizedToken originalValue="AC">A-C</normalizedToken>
). Penis long, tapering, flat, blunt, distal portion being well demarcated from proximal portion, opening through sub-terminal pa
<pageBreakToken pageId="8" pageNumber="9" start="start">pilla</pageBreakToken>
on the left, whitish with a median grey stripe at the distal portion (in the grey pigmented specimens), proximal portion bent upon itself and wrinkled near the base; base usually black pigmented ventrally, its attachment area well behind the right eye; penial duct strongly undulating in base and straight distally, near centrally positioned and opening on the left side of penis; prostate like an elongate bean with mean length 0.44 mm (three specimens).
</paragraph>
<caption pageId="8" pageNumber="9">
<paragraph pageId="8" pageNumber="9">
Figure 7. Reproductive anatomy of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="8" pageNumber="9" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n., sp. n.
<normalizedToken originalValue="AC">A-C</normalizedToken>
Penis D Female genitalia (viewed from the left side) E Shell with an egg capsule into the umbilicus. Scale bars: A, B, D 0.5 mm, C, E 1 mm. Abbreviations are given in the Materials and methods.
</paragraph>
</caption>
<paragraph pageId="8" pageNumber="9">
Female reproductive system (Figs 4
<normalizedToken originalValue="BC">B-C</normalizedToken>
, 7
<normalizedToken originalValue="DE">D-E</normalizedToken>
). Pallial oviduct glands, i.e. albumen and capsule glands, very small, total mean length 0.53 mm, total mean width 0.24 mm (three specimens); bursa copulatrix large-sized, pyriform, posteriorly positioned and fully protruding from the posterior end of the albumen gland; bursal duct length a little shorter than or equal to bursa copulatrix length; renal oviduct unpigmented and well-developed, tightly coiled in a shape of lower case
<normalizedToken originalValue="ε">ε</normalizedToken>
(Greek); two seminal receptacles lying parallel on the renal oviduct and rather close to each other; distal seminal receptacle (Sr1) very small, globular with very short duct; proximal seminal receptacle (Sr2) larger, usually lying tightly over the renal oviduct and against bursa copulatrix; proximal seminal receptacle (Sr2) with a pink pearl shine. In some specimens, an egg capsule with a single egg was found inside the umbilicus (Fig. 7E).
</paragraph>
</subSubSection>
<subSubSection pageId="8" pageNumber="9" type="distribution">
<paragraph pageId="8" pageNumber="9">Distribution and habitat.</paragraph>
<paragraph pageId="8" pageNumber="9">
So far the distribution of
<taxonomicName class="Gastropoda" family="Hydrobiidae" genus="Myrtoessa" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Myrtoessa hyas" order="Littorinimorpha" pageId="8" pageNumber="9" phylum="Arthropoda" rank="species" species="hyas">Myrtoessa hyas</taxonomicName>
gen. n. &amp; sp. n., seems to be restricted to the type locality on Parnon Mt., Peloponnisos. At the type locality, the geological substrate is limestone; all the specimens of the new species were found on stones, gravel, mosses and dead leaves of
<taxonomicName class="Magnoliopsida" family="Platanaceae" genus="Platanus" higherTaxonomySource="CoL" kingdom="Plantae" lsidName="Platanus orientalis" order="Proteales" pageId="8" pageNumber="9" phylum="Tracheophyta" rank="species" species="orientalis">Platanus orientalis</taxonomicName>
L. accumulated on the bottom of a stream. Many
<taxonomicName class="Gastropoda" family="Bythinellidae" genus="Bythinella" higherTaxonomySource="CoL" kingdom="Animalia" lsidName="Bythinella" order="Littorinimorpha" pageId="8" pageNumber="9" phylum="Mollusca" rank="genus">Bythinella</taxonomicName>
sp. individuals were found to share the same stream.
</paragraph>
</subSubSection>
</treatment>
</document>