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<mods:title id="068EA41CC0EA944C30E0D51ACA76C6B2">The fungus-growing ant genus Apterostigma in Dominican amber.</mods:title>
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<treatment id="8E28C568D352C87326E5396B60EE5E12" ID-DOI="http://doi.org/10.5281/zenodo.6248103" ID-GBIF-Taxon="100134271" ID-Zenodo-Dep="6248103" LSID="urn:lsid:plazi:treatment:8E28C568D352C87326E5396B60EE5E12" httpUri="http://treatment.plazi.org/id/8E28C568D352C87326E5396B60EE5E12" lastPageNumber="427" pageNumber="426">
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<paragraph id="80EBE3FBDF468FFE7E082F9C186AAA83" pageNumber="426">
<taxonomicName id="7542457017035F4273C609BED9C98B57" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:238037" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma electropilosum" order="Hymenoptera" pageNumber="426" phylum="Arthropoda" rank="species" species="electropilosum">Apterostigma electropilosum</taxonomicName>
,
<taxonomicNameLabel id="0A145CE65B2CF42060A55328D4D26BE1" rank="species">new species</taxonomicNameLabel>
</paragraph>
</subSubSection>
<subSubSection id="0654E439A030E3758471B6C85C561E86" type="description">
<paragraph id="7A2611C483A4CF2988B83FB319E95362" pageNumber="426">(Figures 1 and 2)</paragraph>
</subSubSection>
<subSubSection id="194CED65D1603A1D19A0DDB05575C42D" type="materials_examined">
<paragraph id="873F4C861AA7E0A26950105B2CCA197A" pageNumber="426">
HOLOTYPE (worker): AMBER: Oligo-Miocene;
<collectingRegionGroup id="A19B9F44447DD79C89B153ADAAD8D5BD" country="Dominican Republic">
<materialsCitationGroup id="57D4B2B7F4F7F0937B872244C2D4C6A8" country="Dominican Republic">
<materialsCitation id="FB2687027D738716EB7E0EE1600A12FE" ID-GBIF-Occurrence="923901472" collectionCode="AMNH, USNM" country="Dominican Republic" specimenCode="00443127">
<collectingCountry id="0E438EDFDEC7B1730FFB9BFB9AF0D9E1">Dominican Republic</collectingCountry>
;
<collectionCode id="9E22E1769837572516A998C9338E4BE8" collectionName="USA, New York, New York, American Museum of Natural History">AMNH</collectionCode>
no. DR- 14 - 984; no other locality data.
<collectionCode id="E21371EF6FDD6EF0A1CCACE5894A2C71" collectionName="USA, Washington D.C., National Museum of Natural History, [formerly, United States National Museum]">USNM</collectionCode>
SIANT database specimen reference number
<specimenCode id="3C8D9F7A641837A07AD364E358337E08">00443127</specimenCode>
. Deposited in
<collectionCode id="55CAFEA40EF95C675332C0BCA4D46B06" collectionName="USA, New York, New York, American Museum of Natural History">AMNH</collectionCode>
</materialsCitation>
.
</materialsCitationGroup>
</collectingRegionGroup>
</paragraph>
</subSubSection>
<subSubSection id="8692A76B0E5625474FEC6796460249AF" type="description">
<paragraph id="BADD6837944DA4806EC6A78A8EC08D9F" pageNumber="426">Measurements: head length = 1.06 mm; head width (not including eyes) = 0.68 mm; scape length = 0.99 mm; Weber s length = 1.37 mm; metafemur length = 1.30 mm.</paragraph>
<paragraph id="17D37827D0A1849DF1409D001AFE0C8C" lastPageNumber="427" pageNumber="426">
DESCRIPTION: In full-face view, head elongate, evenly rounded at the posterolateral corners and slightly concave at the median posterior border. As in all
<taxonomicName id="C26C3D9EA5F5AF5C168F54D387B27FC3" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:2356" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma Mayr" order="Hymenoptera" pageNumber="426" phylum="Arthropoda" rank="genus">Apterostigma</taxonomicName>
species, occiput drawn out posteriorly into a “ neck ” or “ collar ”; in this species, the collar short, not expanded posteriorly, and lacking integumental rugosities. Frontal carinae strongly produced, extending posterad to well past the level of the eyes. Vertexal carinae not visible, possibly obscured by the amber matrix and by the unusual texture of the integument, discussed below. Vestigial preocular carinae extending posterad to top of eye. Frontal lobes evenly rounded. Antennae with the typical attine number of eleven segments, the apical antennal segment 2.5 × as long as the subapical segment, the subapical segment subequal in length to the pedicel. Clypeus clearly with a smooth, shining anterior border, produced medially into a broad, V-shaped angle. Mandibles with eleven teeth, all unusually sharp and showing no wear, teeth decreasing evenly in size toward the mandibular base. Lateral corners of the hypostoma produced into blunt, rounded “ hypostomal teeth. ” Eyes with six ommatidia across at narrowest circumference (subparallel to the transverse plane) and ten ommatidia across at greatest circumference (subparallel to the longitudinal axis). Eyes prominent and hemispherical, each hemisphere interrupted from behind (i. e., ventrally) by a straight line of occluding integument.
</paragraph>
<paragraph id="801A9993CA49EC112847B64861B13ADE" pageNumber="427">Promesonotum with a pair of longitudinal, uniformly low carinae. Anterolateral mesonotal carinae apparently absent and humeral prominences vestigial. Posterior mesonotum with a pair of reduced, very short, almost vestigial carinae (“ arista metanotal ” of Lattke, 1997), best described as vestigial tubercles. Ventral mesopleural carinae present and complete, but not lamellate. Meso- and metacoxae of typical form, without lamellate or keel-like carinae. Propodeum carinate on the basal and declivous faces, the carinae essentially interrupted extensions of the promesonotal pair. Propodeal spines or tubercles absent, propodeal shoulder evenly rounded.</paragraph>
<paragraph id="BE0CB681936ACF3423F918891B2821C8" pageNumber="427">Petiole short and thick, entirely lacking a node; anterior ventral tooth apparently absent. Viewed dorsally, postpetiole roughly as long as broad, and about half as broad anteriorly as posteriorly. First gastral (fourth abdominal) tergite strongly laterally carinate for at least threefourths of its length.</paragraph>
<paragraph id="29D57B5B4CFEDB6252D757770A38B07E" pageNumber="427">
Body covered with long, fine, simple, erect setae with a maximum length of 0.15 mm. Integument with a mottled, coarsely granulate texture that interferes with the study of microsculpture. On close inspection, this texture apparently caused by shining bubbles, possibly of an oily secretion, that arose from punctures in the integument while the amber was in a semiliquid state. A similar phenomenon was observed in a modern
<taxonomicName id="F79B269F6BFCC3B1DCC5A36E836A6F7C" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:2356" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma Mayr" order="Hymenoptera" pageNumber="427" phylum="Arthropoda" rank="genus">Apterostigma</taxonomicName>
specimen embedded in Canada balsam by N. A. Weber.
</paragraph>
<paragraph id="AEA913421A14F58DD187BE02110496A4" pageNumber="427">
The shining clypeal border places this species in the
<taxonomicName id="9D12D0A6D7B403976965E88777A5ED39" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:25913" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma pilosum Mayr" order="Hymenoptera" pageNumber="427" phylum="Arthropoda" rank="species" species="pilosum">pilosum</taxonomicName>
group (sensu Lattke, 1997), one of two informal subgeneric groupings. The specimen keys out to
<taxonomicName id="CA966EEDDC7BB60AF785BD6153CFEDFC" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:238038" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma wasmanni" order="Hymenoptera" pageNumber="427" phylum="Arthropoda" rank="species" species="wasmanni">A. wasmanni</taxonomicName>
(southern Brazil) in Lattke s (1997) key, but differs from that species in being less strongly sculptured and in having the median clypeal angle more pronounced. In habitus it is similar to many small cryptic species that key out to Lattke s unrevised “
<taxonomicName id="9FADBC9CBB1B4DC062F4513C756B5C52" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:25913" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma pilosum Mayr" order="Hymenoptera" pageNumber="427" phylum="Arthropoda" rank="species" species="pilosum">pilosum</taxonomicName>
complex ” of species, but is distinct among them in combining evenly rounded frontal lobes, eleven mandibular teeth, and a medially angulate clypeus.
</paragraph>
</subSubSection>
<subSubSection id="781BB8039E590086078CA03C187E6215" type="etymology">
<paragraph id="860A8B3D2FC7277ABEB851B8884E3904" pageNumber="427">
ETYMOLOGY: The species name indicates that this is a species of the
<taxonomicName id="EA6D426E4A27295963FB672259484AF1" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:25913" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma pilosum Mayr" order="Hymenoptera" pageNumber="427" phylum="Arthropoda" rank="species" species="pilosum">pilosum</taxonomicName>
group, and probably of the
<taxonomicName id="A8327A143704C83DC16D1644E7C9A36F" LSID-HNS="urn:lsid:biosci.ohio-state.edu:osuc_concepts:25913" class="Insecta" family="Formicidae" genus="Apterostigma" higherTaxonomySource="CoL" kingdom="Animalia" lsidName-HNS="Apterostigma pilosum Mayr" order="Hymenoptera" pageNumber="427" phylum="Arthropoda" rank="species" species="pilosum">pilosum</taxonomicName>
complex, in amber (electrum).
</paragraph>
</subSubSection>
</treatment>
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