Eurystethus, Mayr, 1864
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publication ID |
https://doi.org/ 10.11646/zootaxa.4958.1.34 |
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publication LSID |
lsid:zoobank.org:pub:D04032DB-BD7F-4360-A2BF-A9BEDA5F5E5F |
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DOI |
https://doi.org/10.5281/zenodo.4692520 |
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persistent identifier |
https://treatment.plazi.org/id/0388F072-7630-FFAE-FF33-9D40FCBE88BA |
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treatment provided by |
Plazi |
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scientific name |
Eurystethus |
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Eurystethus jo sp. nov.
( Figs. 1A, B View FIGURE 1 ; 2A, B View FIGURE 2 ; 3A–D View FIGURE 3 ; 4 View FIGURE 4 )
Etymology. The name honors the prominent taxonomist Jocélia Grazia, the way her friends affectionately call her; noun in apposition.
Holotype male. BRAZIL. Amazonas. ♂, Barcelos , rio Unini, Boca da Onça; 25–26/I/1990; P. Bürhnheim, H. Remold, N.O. Aguiar e J. da Silva col. [lat. -0.973987; long. -62.925583] ( UFAM).
Differential diagnosis. This is one of the tiniest species in Eurystethus together with E. microlobatus Ruckes. Eurystethus jo sp. nov. shares with E. parvulus Ruckes the general morphology of the body and pygophore, such as laterally projected parameres whose apices curve ventrad and partially reach each other beneath the segment X. However, in E. jo the lateral projection of paramere is acuminate and almost touches the posterolateral angles, and the long thorn-like projections of the process of ventral rim are unique and long ( Figs 3B, D View FIGURE 3 , pvr); in E. parvulus the projection and processes are shorter. The area behind the eyes ( Fig. 2B View FIGURE 2 , abe) almost entirely black, a conspicuous macula at the end of the radial vein at corium, and the lateral areas of urosternites densely spotted differs E. jo from E. multipunctatus sp. nov. and E. rufodorsatus sp. nov., which have the area behind the eyes mostly yellow, macula almost inconspicuous and urosternites sparsely spotted. Also, E. jo has anteocular angles slightly developed ( Fig. 2A View FIGURE 2 , aoa), different from the undeveloped anteocular angles of E. multipunctatus , and the head longer than wide, different from the E. rufodorsatus with head as long as wide. The male parameres ( Fig. 3A View FIGURE 3 , pa) are bilobed and oblique to each other at apex ( Fig. 3B View FIGURE 3 ), with both lobes about the same size and only the posterior lobes reaching each other beneath the segment X ( Figs 3A, X View FIGURE 3 , Figs 3B–D View FIGURE 3 ). The shape of parameres and the subrectangular and long posterolateral angles of pygophore ( Fig. 3A View FIGURE 3 , pla), differs E. jo from E. multipunctatus , with posterolateral angles wider.
Description. Head: Mandibular plates reflexed.Anteocular angles developed, rounded and shorter than half the width of the eyes. Interommatidial sensilla ( Fig. 2A View FIGURE 2 , ios) long. Area behind the eyes almost entirely black, yellow on middle and narrow close to the eyes. Ventral surface of head with punctures on base of buccula and near the posterior half of it. Margins of maxillary plates with tiny black spots. Antennomeres proportions: I<II>III<IV; V not observed. Antennomere I almost entirely black, except on dorsal side and smoky ventral area. Intercalary labial unit short, enlarged (sensu Ruckes 1966).
Thorax: Pronotum with punctured spots at posterior margin of pronotum. Anterolateral angles ( Fig. 2A View FIGURE 2 , ala) directed laterad.Anterolateral margins of pronotum slightly arcuate.Transhumeral tubercles ( Figs 2A–B View FIGURE 2 , tht) slightly developed and rounded. Scutellum with dense punctured spots on the lateral face of tubercles. Anterior tubercles of scutellum ( Figs 2A–B View FIGURE 2 , ats) developed, acuminate, surpassing the height of transhumeral tubercles in lateral view ( Fig. 2B View FIGURE 2 ). Posterior tubercle ( Fig. 2B View FIGURE 2 , pts) slightly tumid. Apex of scutellum ( Fig. 2B View FIGURE 2 , aps) reflexed and high, about ⅓ the anterior tubercles height and surpassing the posterior tubercles height. Lateral portions of thoracic pleura with dense punctured spots. Femora with reddish marks, sparse black spots, and incomplete annulus near apices. Tibiae yellow on apices. Tarsi yellow with few reddish marks.
Abdomen: Connexival segments with few punctured spots and reddish mark on anterior and posterior margins of each segment. Urosternites heterogeneously and densely spotted on lateral thirds; urosternite VII with spots also on middle third. Intersegmental areas, pseudosuture and trichobothrial tubercles light brown to concolor with the abdomen. Spiracles black.
Male ( Figs 3A–D View FIGURE 3 ): Pygophore campaniform. Basal portion of parameres flat, directed laterad over the posterolateral angles of pygophore; distal portions convergent to each other, abruptly curved ventrally and then mesially ( Fig. 3C View FIGURE 3 ); apex truncate and bilobed, with rounded angles. Process of ventral rim shield-like, ventral portion developed into a pair of black thorns ( Figs 3B, D View FIGURE 3 , pvr). Posterolateral angles dorsoposteriorly projected, ventrally shallowly concave, apex subrectangular with rounded angles. Ventral margin of pygophore ( Figs 3A–D View FIGURE 3 , vm) medially concave, with dense and black punctured spots forming a broad transversal line.
Measurements. Total length: 7.4 mm; abdominal width: 4.8 mm; head length: 1.8 mm; head width: 0.8 mm; antennomeres length: I, 0.6; II, 0.7; III, 0.7; IV, 1 mm; pronotum length: 1.7 mm; pronotum width: 4.5 mm; scutellum length: 3.11 mm; scutellum basal width: 2.62 mm.
Distribution ( Fig. 4 View FIGURE 4 ). BRAZIL. Amazonas: Barcelos.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.