Cheiloxena monga

Reid, C. A. M. & Beatson, M., 2018, Revision of the Australian leaf beetle genus Cheiloxena Baly, 1860 (Coleoptera: Chrysomelidae: Spilopyrinae), Zootaxa 4497 (4), pp. 501-534: 526-527

publication ID

https://doi.org/10.11646/zootaxa.4497.4.3

publication LSID

lsid:zoobank.org:pub:7DFD16E7-D628-48DA-AAD6-4AB1E4D679E2

persistent identifier

http://treatment.plazi.org/id/2A2D1376-6B68-FF99-FF1A-FD21064A5D3E

treatment provided by

Plazi

scientific name

Cheiloxena monga
status

sp. nov.

Cheiloxena monga  sp. nov.

( Figs 9 View Figure , 18 View Figure , 27 View Figure , 34 View Figure , 48 View Figure , 58 View Figure , 77 View Figure )

Cheiloxena frenchae  male, sensu Reid 1992, nec Blackburn1893.

Mateiral examined. Type. Holotype: Ƌ*/ 5k SSW Monga NSWAbout NSW Euc. rubida  12.xi.1985 C. Reid/ ( ANICAbout ANIC).

Diagnosis. Cheiloxena monga  is distinguished by: upper and lower surfaces scaled; anterior margin of clypeus truncate; pronotum with almost parallel paired ridges; hypomeral lobe rugose, without scales; apical half of elytra conspicuously tuberculate, with largest tubercles arranged in a curve.

Description (female unknown). Length 11 mm; body moderately convex in profile, length about 3x height; colour black, but elytra mostly dark brown with black tubercles, and maxillary and labial palpi reddish-brown; almost entirely clothed with adpressed creamy-white scale-like setae (length 3– 5x width), not distinctly variegated in colour, setae not thinner on depressed areas of pronotum and elytra, thinner on anterior of clypeus, apices of mandibles, prosternal and mesoventral processes, legs, apex of abdominal ventrite V, and antennomeres 1–7, scalelike setae absent from antennomeres 8–11 (minute simple setae only); scale-like setae distributed as follows: almost evenly on head but clypeal margins anteriorly glabrous; almost evenly on pronotum but slightly sparser on depressed areas and absent from apices of ridges; scutellum clothed with thin setae; elytra with irregular mosaic of dense patches and more sparsely setose areas, setae of larger tubercles not differentiated except slightly more elongate; ventral surfaces with dense white adpressed setae except thin and sparse on apical half of ventrite V, setae of appendages thin but dense (except antennomeres 8–11); surface sculpture: head including clypeal margins, pronotum and metaventrite densely punctured and microreticulate, dull, elytra and rest of thoracic venter, including pronotal hypomera, densely microsculptured and dull; apices of tubercles and ridges, and abdominal ventrites shiny and not or shallowly microsculptured.

Head ( Figs 9 View Figure , 18 View Figure , 27 View Figure ): slightly narrower than pronotum; densely and slightly confluently punctured, punctures small but larger than ommatidia, intervals dull and microsculptured, including narrow impunctate frontoclypeal sutures, apical margin clypeus, and margin of antennal cavities; convex between eyes, shallowly concave between antennae; eyes laterally prominent, separated by about 3 eye widths; gena at shortest point about 0.3x eye length; genal lobe 2x shortest length of gena; antennae 3x socket diameters apart; antennae about 0.75x body length; antennomeres 1–6 dull with shining apices, apical half of 7, and whole of 8–11 matt; antennomeres 1 and 3–11 elongate, 2 slightly transverse and about 0.5x length of 1, 0.25x length of 3, relative lengths of antennomeres, with 3 longest and 7 next, and middle segments unequal in length: 2, <1, <8, <4=9=10, <6, <5, <11, <7, <3; clypeus with 2 pairs of long subapical setae; clypeal anterior margin truncate; apical maxillary palpomere broadly ovoid, with truncate apex.

Thorax ( Figs 9 View Figure , 18 View Figure , 27 View Figure , 34 View Figure ): sides bulging slightly at middle, no clear distinction between dorsal and ventral (hypomeral) areas of pronotum; pronotal punctures dense, diameters 1.5– 2x larger than on head; interspaces dull, densely microsculptured; pronotum slightly wider than long (measured at midline), length 0.95x width, greatest width at middle, sides weakly sinuate; anterior angles prominent but apices blunt, 90°; anterior margin produced, concave at middle; sides without tubercles; basal margin truncate; pronotal disc with two prominent subparallel keels from middle to anterior margin, almost symmetrically convex in lateral view, sharper in anterior half; remainder of disc unevenly surfaced, concave apicolaterally and either side of small postmedian swelling; hypomeron and prosternum densely punctured and pubescent, as pronotum, except hypomeral lobe rugose and glabrous; scutellum closely punctured and setose, scales more elongate than on pronotum; elytra irregularly scaled, forming network of pale flecks; elytron conspicuously tuberculate, with variably sized shiny-tipped tubercles arranged in approximately 4 clusters close to suture, from base to apex, as follows: first (basal) with 1 large blunt tubercle at apex of ridge from base of elytra; second (median) with 1 smaller conical or elongate tubercle; third (subapical) with 3 conical tubercles arranged in an equilateral triangle, largest lateral and smallest basal; fourth (apical) with 3 conspicuous but smaller well-separated tubercles arranged in an equilateral triangle; small tubercles scattered at base and sides of elytron; elytral disc shallowly arcuately depressed in basal half, posterior to humerus, and concave at sides of middle; elytral punctures large, similar diameter to largest on pronotum, but much deeper, and slightly sparser, separated by 1–1.5x diameters; interspaces dull, densely microsculptured; discal elytral punctures with two small shining tubercles laterally on rim; elytral apex narrowly truncate; epipleuron finely and shallowly punctured, with scale-like pubescence; mesoventrite punctured as prosternum; metepisternum and metaventrite dull and microsculptured, densely punctured and scaled, except midline impunctate and shining; metatibiae with shallow irregular lateral longitudinal grooves, thin and elongated; bases of tarsomeres 1–3 depressed and not expanded.

Abdomen ( Figs 48 View Figure , 58 View Figure ): ventrites I–V shinier than thoracic ventrites, strongly but less densely punctured and more shallowly microreticulate; ventrite pubescence recumbent, scale-like, but much narrower on ventrite V, only erect setae present on apical half of ventrite V; apex of ventrite V feebly convex; apex of penis contracted to blunt mucronate tip in dorsal view, apex thick and short in lateral view, strongly curved; tegminal keel shallowly sinuate in lateral view, with acute simple proximal tip.

Etymology. Named from the type locality, as a noun in apposition.

Notes. Cheiloxena monga  is only known from the holotype, collected at the margin of cool temperate rainforest and tall eucalypt forest in what is now Monga National Park. It was beaten off a sapling of Eucalyptus rubida  , now a synonym of E. dalrympleana  ( Myrtaceae  ), with no evidence of feeding.

This specimen was previously incorporated in a description of C. frenchae  , when the only other known specimen of that species was the holotype ( Reid 1992). Based on the small amount of additional material of this complex ( C. aitori  , C. frenchae  and C. monga  ) made available since 1992 we now believe that the Monga specimen represents a valid species.

NSW

Royal Botanic Gardens, National Herbarium of New South Wales

ANIC

Australian National Insect Collection

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Chrysomelidae

Genus

Cheiloxena

Loc

Cheiloxena monga

Reid, C. A. M. & Beatson, M. 2018

2018
Loc

rubida

H.Deane & Maiden 1899

1899
Loc

Cheiloxena frenchae

Blackburn. Not 1893

1893