Platyjassus Evans, 1953
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publication ID |
https://doi.org/ 10.5852/ejt.2020.695 |
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publication LSID |
lsid:zoobank.org:pub:DC24EAB0-DCF5-44A8-B1A0-82BF25D280C2 |
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persistent identifier |
https://treatment.plazi.org/id/03A587FC-FFA3-B50A-FD0E-85B3FA8D57B4 |
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treatment provided by |
Valdenar |
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scientific name |
Platyjassus Evans, 1953 |
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Platyjassus Evans, 1953 View in CoL
Figs 2 View Fig E–P, 9–11, 17D–L, 22
Type species
Platyjassus viridis Evans, 1953 View in CoL , by original monotypy.
Diagnosis
This genus may be distinguished by the following combination of features: body medium-sized; color pale stramineous without distinct spots or stripes; vertex overlapping>½ of anterolateral margin of eye, crown uniformly shagreen; forewing without supernumerary crossveins; hindwing veins R4+5 and M1+2 confluent preapically but separate near apex; hind femur macrosetal formula 2+2 +1; style apex tapered or foot-like; aedeagus usually with single asymmetrical process arising from atrium.
Description
HABITUS. Medium-sized platyjassines (6.8–9.3 mm). Color stramineous, with darker pigment at apex of forewing and variably present on venter and legs.
HEAD. Crown flattened, uniformly shagreen, anterior margin strongly produced, spatulate, forming hood over dorsal part of face, lateral extension of vertex overlapping at least half of eye margin; ocelli anteromesad of eyes. Frontoclypeus moderately convex, with slight median dorsal depression; antennal ledge transverse, strongly overlapping frontoclypeus; lateral frontal suture present above antennal ledge but not extended to crown margin; gena slightly emarginate below eye but completely concealing proepisternum; lorum small, flat; anteclypeus slightly convex, lateral margins only slightly divergent distally; rostrum slender, not surpassing front trochanters.
THORAX. Pronotum slightly declivous, in profile continuing contour of crown, much wider than head, lateral margins strongly divergent posterad, transverse striations weakly delimited. Forewing without supernumerary crossveins, appendix broad and extended to wing apex, inner apical cell relatively short. Hindwing veins R4+5 and M1+2 confluent preapically but separate near apex. Front femur row IC with setae in single row and relatively widely spaced; AV with single row of stout setae in basal half, dorsal surface of tibia rounded, PD with 4 widely spaced macrosetae. Hind femur macrosetal formula 2 +2+1, tibial row AD with one or more smaller setae between successive macrosetae; tarsomere I plantar row single and weakly developed, pecten with 4 platellae.
ABDOMEN. Male pregenital sternite distinctly longer than sternite VII, posterior margin truncate. Male pygofer base band-like, dorsally with median posterior projection; lobe separated from base by membranous vertical cleft, with numerous macrosetae in distal half, apex tapered to point (rounded in P. symmetricus sp. nov.), processes and spines absent, ventral margin without distinct group of fine setae. Subgenital plate without macrosetae, dorsolateral margin with row of long, fine setae. Style apophysis slender, usually with ventral denticuli, apex curved dorsomesad. Aedeagus with shaft simple, gonopore at or near apex; one asymmetrical process present, usually arising separately from venter of atrium (except in P. asymmetricus sp. nov.); shaft rarely with paired processes ( P. symmetricus sp. nov.). Female abdominal sternite VII with posterior margin varying in shape among species. First valvulae with dorsal sculpturing strigate. Second valvulae usually broadened toward midlength, then tapered, dorsal margin serrate distally.
Remarks
The definition of the genus is here narrowed to include only the type species, originally described by Evans (1953) and redescribed and illustrated by Linnavuori & Quartau (1975), plus 11 new species that are very similar in external appearance but have distinctive male genitalia. Other species placed by Evans (1959) in this genus are here transferred to Pallijassus gen. nov. and Plerujassus gen. nov. Platyjassus appears to be most closely related to Platyjassula , but differs from the latter in lacking supernumerary crossveins in the forewing, in having the aedeagus usually distinctly asymmetrical and in having the style apex with a single point or foot-like rather than with two acuminate projections.
Key to species of Platyjassus Evans, 1953 View in CoL (males)
1. Forewing with large red spot covering preapical section ( Fig. 2N View Fig ) ................................................. ........................................................................................................... Platyjassus pictipennis View in CoL sp. nov.
– Forewing without red spot, uniformly stramineous except for fuscous areas in apical cells.....2
2. Style without distinct preapical constriction, evenly tapered throughout length or tapered only at apex, at most with slight dorsal preapical concavity ( Fig. 9B, F, I, L View Fig ).....................................3
– Style apophysis with distinct preapical constriction and narrow distal extension ( Figs 10E View Fig , 11A View Fig )................................................................................................................................................8
3. Style apophysis tapered through most of length to acuminate apex ( Fig. 9B View Fig ).......................4
– Style apophysis approximately parallel-sided or expanded through most of length, apex abruptly tapered ( Fig. 9F View Fig )................................................................................................................................7
4. Aedeagus without atrial processes, shaft globular, with slender prepical process on right side ( Fig. 9D View Fig ) ..................................................................................... Platyjassus asymmetricus View in CoL sp. nov.
– Aedeagus with process arising from atrium..................................................................................5
5. Aedeagal shaft with pair of short, symmetrical lateral processes preapically ( Fig. 10L View Fig ) ............... ........................................................................................................ Platyjassus symmetricus View in CoL sp. nov.
– Aedeagal shaft without processes....................................................................................................6
6. Aedeagus with basal process very slender and short ( Fig. 10N View Fig ); style apophysis with distinct dorsal lobe near base ( Fig. 10N View Fig ) ....................................................... Platyjassus vestigius View in CoL sp. nov.
– Aedeagus with basal process robust; style apophysis without distinct dorsal lobe near base ( Fig. 9L View Fig ) ...................................................................................... Platyjassus harinhalai View in CoL sp. nov.
7. Aedeagus with basal process much longer than shaft, divergent from shaft in lateral view ( Fig. 9I View Fig ) .................................................................................................... Platyjassus griswoldi View in CoL sp. nov.
– Aedeagus with basal process subequal to shaft in length, convergent toward shaft in lateral view ( Fig. 9F View Fig ) ................................................................................................ Platyjassus fisheri View in CoL sp. nov. 8. Basal process of aedeagus with spine-like preapical median branch ( Fig. 10C View Fig ) ............................ .................................................................................................................. Platyjassus irwini View in CoL sp. nov.
– Basal process of aedeagus without preapical branch.......................................................................9
9. Basal process of aedeagus closely adjacent to or overlapping shaft in ventral view ( Fig. 10F View Fig ); style apex foot-like, with acutely pointed ventral heel and recurved dorsal toe ( Fig. 10E View Fig ) ......... ........................................................................................................... Platyjassus pedistylus View in CoL sp. nov.
– Basal process of aedeagus well separated from shaft in ventral view ( Fig. 11C View Fig ); style apex not foot-like, with single acute dorsal point ( Fig. 11A View Fig ) ....................................... ( viridis View in CoL complex)...10
10. Ventral preapical lobe of style obtusely rounded, not angulate ( Fig. 11G View Fig ) ......................................... ............................................................................................................ Platyjassus viridis Evans, 1953 View in CoL
– Ventral prepical lobe of style apophysis forming acute or right angled lobe in lateral view ( Fig. 11A, D View Fig ).............................................................................................................................................11
11. Ventral preapical lobe of style apophysis distinctly acute ( Fig. 11A View Fig ) ............................................ ................................................................................................................. Platyjassus acutus View in CoL sp. nov.
– Ventral preapical lobe of style apophysis forming right angle ( Fig. 11D View Fig ) ....................................... .................................................................................................................. Platyjassus pennyi View in CoL sp. nov.
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