Kamabrachys rieki Constant 2023, gen. et sp. nov.
Creators: name: Constant, Jérôme
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hemiptera
Eurybrachidae
Kamabrachys
Kamabrachys rieki

description: Kamabrachys rieki gen. et sp. nov.
urn:lsid:zoobank.org:act: 38450F1B-4524-424E-8BEE-E84A220DEC5B
Figs 5B, 51–56
Diagnosis
The species can be recognized by the following combination of characters:
(1) posterior margin of the lateroventral lobes of the pygofer (lvl) rounded in lateral view (Fig. 53A) and rounded in ventral view (Fig. 53C), inner margin of lobes concave in ventral view (Fig. 53C), ventral margin rounded in caudal view (Fig. 53E);
(2) posterior margin of laterodorsal process of gonostylus (ldg) weakly roundly emarginate, leaving a deep acute open angle between laterodorsal process and ventral process of gonostylus (vp) in lateral view (Fig. 53A);
(3) crest of furcate process of periandrium (cfp) only along distal portion and not merging basally (Fig. 55D), in lateral view, tapering towards the posterior in distal portion (Fig. 55E);
(4) laterodorsal process of periandrium (ldp) tapering in distal portion and curved laterad then dorsad, slightly shorter than lateroventral process (lvp) (Fig. 55D–E);
(5) lateroventral process of periandrium (lvp) dorsoventrally flattened in long basal portion and strongly curved laterad distally (Fig. 55D–F);
(6) apicodorsal process of aedeagus (adp) moderately sinuate, dilated distally and tapering apically, and shorter than apicoventral process (avp) (Fig. 55A–C);
(7) posterior wing without whitish marking along sutural margin (Fig. 51A).
Etymology
The species name is a patronym referring to the Australian entomologist Edgar Frederick Riek (1920– 2016) who collected the type series of this species.
Type material
Holotype AUSTRALIA • ♂; [Queensland], 17 km W of Kihee; 27°23′17″ S, 142°26′51″ E; 12 Oct. 1949; E.F. Riek leg.; “17 W Kihee, 12 Oct 49, E F Riek”; ANIC.
Paratypes AUSTRALIA • 1 ♂; same collection data as for holotype; ANIC • 1 ♀; same collection data as for holotype; RBINS • 1 ♀; [Queensland], 33 km W of Kihee; 27°23′17″ S, 142°17′15″ E; 12 Oct. 1949; E.F. Riek leg.; “33 W Kihee, 12 Oct 49, E F Riek”; ANIC • 1 ♂; same collection data as for preceding; RBINS.
Description
MEASUREMENTS AND RATIOS. LT: ♂ (n = 3): 8.25 mm (7.90–8.45), ♀ (n = 2): 9.44 mm (9.37–9.52); BV/ LV: ♂ (n = 1): 3.90, ♀ (n = 1): 3.78; BF/LF: ♂ (n = 1): 1.43, ♀ (n = 1): 1.39; LP+LM/BT: ♂ (n = 1): 0.78, ♀ (n = 1): 0.79; LM/LP: ♂ (n = 1): 3.17, ♀ (n = 1): 2.98; LTg/BTg: ♂ (n = 1): 2.62, ♀ (n = 1): 2.53; LW/BW: ♂ (n = 1): 1.78, ♀ (n = 1): 1.74.
HEAD (Figs 51A–D, 52A–D). Slightly narrower than thorax. Vertex brown irregularly variegated with black; 3.8–3.9 times as broad as long, concave with all margins slightly carinate; anterior and posterior margins rather weakly rounded, subparallel. Frons brown irregularly variegated with black, more densely black than vertex; slightly paler transverse band above lateral angles, often interrupted and reduced to 2 aligned markings; often, in middle above pale band, a narrow pale line reaching the pale band ventrally and stopped before peridiscal carina dorsally or shortened, sometimes reduced to a short elongate marking; small triangular yellowish marking at dorsolateral angles; about 1.4 times as broad as long, slightly convex, slightly rugulose with peridiscal carina slightly marked; upper margin of frons weakly curved in perpendicular view of frons; lateral margin incurved above lateral projection of frons, more or less straight to broadly rounded under the projection. Clypeus brown with median black line and regular oblique lines on each side of postclypeus, anteclypeus black with median pale reddish-brown line on carina; clypeus reaching mesocoxae, elongate, with median carina on anteclypeus prolongated with obsolete carina on postclypeus; base of clypeus rounded. Labium dark brown, reaching metacoxae, with apical segment as long as broad, acuminate, shorter and slightly more slender than penultimate. Genae pale yellowish variegated with brown. Ocelli absent. Antennae brown, not surpassing eye, not visible from above; scape about as long as broad, pedicel subcylindrical, elongate, narrowing towards apex.
THORAX (Figs 51A, C, 52A, C). About 1.27 times as broad as combined length of pro- and mesonotum. Pronotum brown irregularly variegated with black, generally slightly paler than vertex; disc weakly wrinkled, carina parallel to anterior margin and 2 obsolete impressed points on disc marked by black spot, often included in a short transverse black marking; paranotal lobes brown sometimes variegated with paler spots. Mesonotum brown irregularly variegated with black, more densely black and generally darker than pronotum; disc weakly wrinkled, median and peridiscal carinae weakly marked; median carina stopped before scutellum. Tegulae bicolour with ventral half black and dorsal half pale brown.
TEGMINA (Figs 51A–C, 52A–C). Pale brown irregularly variegated with black markings, slightly paler after nodal line and with background colour of apical portion darker; small apical white marking small extending along 1–3 cells; anteapical transverse white line, usually complete but narrower in middle portion, sometimes shortly interrupted; in dark specimens, 2 more or less complete transverse black bands, more basal one at basal ¼ starting from squarish or transverse black marking in middle of clavus, extending into a band to costal margin, second one at mid-length of tegmen, oblique, tapering from costal margin to vein MP, getting less distinct towards sutural margin, area between black bands much paler, with very few black markings; in pale specimens, bands not or weakly distinct, squarish black marking in clavus sometimes present. Flat, elongate, about 2.5–2.6 times as long as broad; costal margin weakly rounded along basal fifth, then more or less straight to nodal line; apex rounded.
VENATION. Veins ScP+RA and RP separated close to base; first fork of MP very basal, at the level of ScP+RA–RP separation; first fork of CuA slightly before apex of clavus; clavus closed; Pcu and A1 fused at about ¾ of clavus length; Pcu+A1 reaching apical angle of clavus; numerous cells along posterior half of costal margin; numerous cross-veins on apical third delimitating small elongate cells.
POSTERIOR WINGS (Figs 51A–B, 52A–B). Pale yellow, narrowly marked with red basally, with apical ⅓ dark brown to blackish brown, apical white marking forming a band extending on 6–10 cells; moderately broad brown band along posterior margin and claval area infuscate. Well developed, as broad as tegmina, about 1.7–1.8 times as long as broad, rounded apically; anal area well developed; sutural margin weakly trilobous; not reaching apex of tegmina at rest. All main veins visible from base, forked at or after nodal line and forming a few closed cells; few transverse veinlets delimiting elongate cells on apical ¼; veins A1 and A2 sometimes with 2 terminals.
LEGS (Figs 51A–E, 52A–D). Pro- and mesofemora and tibiae brown, sometimes slightly reddish, densely variegated with dark brown to black, dorsum of tibiae more uniformly brown, protibiae usually slightly darker than mesotibiae; pro- and mesotarsi paler than corresponding tibia but blackish brown apically; posterior legs brown with apex of tibial and tarsal spines darker. Pro- and mesofemora and tibiae dorsoventrally flattened, elongate and slender; metatibiae with 3 lateral and 10 apical spines; first metatarsomere ventrally with grey pad of microsetae at internoapical angle and two rows of 5 spines. Metatibiotarsal formula: (3) 10/4/0.
MALE TERMINALIA (Figs 53–55). Pygofer (Py) rather short, as high as long and oblique, rather abruptly narrowing in uppermost portion in lateral view (Fig. 53A), about 2.3 times as wide as high in caudal view (Fig. 53E); basal apodeme (bap) weakly elongate, subtriangular, well developed and sclerotized, sinuate in dorsal view (Fig. 53A–C); dorsal portion narrow (Fig. 53A–B); lateroventral lobe (lvl) projecting posterolaterally and rounded towards the anterior and towards the posterior in dorsal view (Fig. 53B); in ventral view, rounded anteriorly, more broadly rounded posteriorly and laterally and with inner margin concave (Fig. 53C); in lateral view, posterior margin broadly rounded with middle portion more weakly curved, anteroventral angle rounded and ventral margin broadly rounded (Fig. 53A); ventral portion of pygofer separated from lateroventral lobe by a well-marked, rather narrow and deep depression (Fig. 53C, E); ventral lamina (vlp) about 3.2 times as broad as long with anterior and posterior margins subparallel in ventral view, posterior margin very slightly incurved and bisinuate with posterolateral angles rounded and weakly projecting posterad (Fig. 53C).Anal tube (An) about as broad as long, dorsoventrally flattened (Fig. 53A), oval with base and apex more strongly rounded than side margins; side margins weakly subparallel in middle portion; apical margin weakly indented in middle (Fig. 53B); paraprocts (pa) at basal ¼, well developed. Gonostyli (G) 1.25 times as broad as long in ventral view (Fig. 53C); ventral process (vp) in ventral view subtriangular, moderately elongate with lateral margin weakly sinuate, then rounded apically (Fig. 53C); laterodorsal process (ldg) partly visible in ventral view (Fig. 53C), rather strongly, sinuate in caudal view with mediolateral angle (mla) moderately marked (Fig. 53E), mediolateral angle slightly projecting dorsally (Fig. 53A, D), posteroventral margin strongly oblique in ventral half in lateral view, forming an acute angle with ventral process (Fig. 53A), dorsal margin angularly rounded before dorsal hook; dorsal hook (dhg) subvertical and subtriangular, then angularly curved cephalad at distal ⅔ in lateral view, (Fig. 53A), apically curved anterolaterad (Fig. 53B), strongly curved laterad then sinuate and directed laterodorsad apically in caudal view (Fig. 53E). Connective (cv) strongly developed, about 1.4 times as long as aedeagus s. lat., with anterior pair of lateral apodemes forming a moderately broad lateral lamina directed posterolaterad and tapering apically; posterior pair of apodemes ribbon-like, well developed laterally and sinuate (Fig. 54A–D). Aedeagus s. lat. moderately upcurved with periandrium reaching more or less level of apex of aedeagus s. str. posteriorly (Fig. 54E– I). Aedeagus s. str. (Fig. 55A–C) with apical processes about 5.7 times as long as broad at mid-length; apicoventral process (avp) smoothly tapering towards the posterior and narrowly rounded apically, weakly curved on inner margin in ventral view; apicodorsal process (adp) in dorsal view (Fig. 55A) rather moderately sinuate, moderately inflated, rather regularly tapering towards apex but forming a subtriangular apical acute point, and shorter than apicoventral process. Dorsal periandrium (Fig. 55D– F) with laterodorsal processes (ldp) abruptly narrowing at about ⅔ of length in lateral view, then strongly curved dorsad and regularly tapering towards acutely pointed apex, in dorsal view, sides more or less parallel on ⅔ of length, then tapering towards apex, rather strongly but regularly curved laterad in middle portion; lateroventral processes (lvp) dorsoventrally flattened on basal + / 5, slightly broadening to basal ¼ then regularly smoothly tapering, strongly curved laterad at 1 / 5 of length, then strongly curved laterad at + / 5 of length, with distal 1 / 5 acutely pointed, projecting slightly beyond laterodorsal processes; basomedian processes (bmp) apically obliquely truncate in dorsal view and with sides parallel in ventral view; median furcate process (mfp) with furca shorter than shaft (Fig. 54I) and upcurved in lateral view (Fig. 55E), dorsal crest (cfp) on about half of length of arms of furca, vertical in dorsal view (Fig. 55D), crest rather abruptly starting basally in lateral view, more or less elongate-oval in lateral view, with dorsal and ventral margins subparallel along middle portion then tapering in distal ¼, and apical margin more or less pointed, dorsal margin irregular in lateral view (Fig. 55E), inner lateral walls of furca weakly granulose, outer walls nearly smooth (Fig. 55D).
FEMALE TERMINALIA (Fig. 56). Abdominal sternite VI (As VI) with sides upcurving in posteroventral view (Fig. 56C); posterior margin in ventral view (Fig. 56B) projecting posteriorly on sides; median subquadrate emargination wide, wider basally (Fig. 56B); subtriangular processes moderately elongate, apically rounded and directed mesad and posterodorsad (Fig. 56B–C); emargination between subtriangular processes and lateral projection rather deeply rounded (Fig. 56B–C); processes of furca of sternite VI (FAs VI) pointed, diverging, moderately developed and strongly curved posterodorsad (Fig. 56B–C). Inner portion of gonocoxa VIII (Gx VIII) moderately curved dorsad (Fig. 56C); posterior margin of gonapophysis (Gy VIII) projecting rather strongly posterad and apically rounded (Fig. 56A– B). Lateroventral excavate membranous fold of gonocoxae VIII between sternite VI and gonapophysis VIII in posteroventral view widely open (Fig. 56C). Inner portion of gonapophysis VIII, subtriangular processes and adjacent part of posterior margin of sternite VI, and processes of furca of sternite VI (FAs VI) densely covered in short strong setae (Fig. 56B–C). Gonoplacs (Gp) unilobed, large and semicircular, mostly hiding the anal tube (Fig. 56D). Gonocoxal bases IX (Gb IX) projecting laterally (Fig. 56B–C). Gonapophysis IX (Gy IX) flattened laterally, reflexed posterodorsad and strongly tapering apically (Fig. 56B, D). Anal tube (An) elongate and narrow, curved posteroventrad, v-shaped in cross section beyond anus, lanceolate in dorsal view (Fig. 56A, C).
SEXUAL DIMORPHISM. Female about 14% larger than male.
Distribution and biology
The species is currently recorded from two very close locations in southwestern Queensland near Kihee (Fig. 5B). Bioregion: Channel Country.
The 5 specimens of the type series were all collected on a single day during the month of October.
Host plant unknown.
description: Published as part of Constant, Jérôme, 2023, Revision of the Eurybrachidae (XVII). The new Australian genus Kamabrachys gen. nov. with ten new species (Hemiptera: Fulgoromorpha), pp. 1-133 in European Journal of Taxonomy 895 (1) on pages 83-92, DOI: 10.5852/ejt.2023.895.2289, http://zenodo.org/record/8402224