Ivalia reidi, Nadein, 2013

Nadein, Konstantin S., 2013, Ivalia Jacoby-a flea beetle genus new to Australia (Coleoptera: Chrysomelidae: Galerucinae), Zootaxa 3669 (3), pp. 384-400 : 385-387

Ivalia reidi , new species

( Figs 1–11 , 33 )

Description. Body nearly round, strongly convex ( Figs 1, 2 ); dorsum brown with weak greenish metallic luster on elytra; elytral margins, epipleura lighter, without luster; head brown to light brown; pronotum shining with yellowish lateral margins; antennomeres 1–4, 10, 11 yellowish; antennomeres 5–9 brown; legs light brown to yellowish; venter unicolored light brown to yellow.

Head ( Fig. 3 ) short, visible portion wider than long; vertex large, feebly convex, with distinct, uniform, shallow punctures; ocular sulcus distinct, reaching antennal socket, feebly curved; frontal calli triangular, smooth, distinctly raised, delimited from frons by distinct sulcus, barely deliniated from vertex; large setiferous pore situated close to inner margin of eye; frontoclypeus trapezoidal, barely convex, shallowly punctate, sometimes with shallow, narrow longitudinal groove, anterior margin weakly concave.

Labrum small, transverse, with moderately shallow medial incision, dorsally with 6 setiferous pores. Maxillary palpomere 2 enlarged; last palpomere about half as long as preceding.

Eyes medium-sized, short-oval, feebly convex. Antennal sockets widely separated; distance between socket and inner margin of eye equal to diameter of a socket; distance between antennal socket and anterior margin of frons twice diameter of a socket; antennae short, antennomere 1 nearly as long as three following combined; antennomere 2 short, broad, about 1.5 times longer than wide; antennomere 3 long, thin, two times longer than wide; antennomeres 4, 5 short, as long as wide; antennomeres 6–11 gradually widening, much wider than previous, about as long as wide; last antennomere largest, two times longer than wide.

Prothorax short; pronotum ( Fig. 4 ) strongly transverse, convex, about 2.7 times wider than long; anterior margin deeply emarginate with anterior angles projecting, medially nearly straight, without carina; lateral margins converging anteriad; carina thin, smooth; anterior angles with large, strongly convex triangular callosity, inner margin of callosity straight; posterior angles not enlarged, barely rounded; posterior margin strongly, evenly convex, without carina; pronotal surface finely punctate, punctures uniform, shallow, distance between punctures about 1–2 times diameter of a puncture; interstices smooth.

Elytra rounded, strongly convex, as long as wide, 3.5 times longer than pronotum, apices elongate; humeral calli reduced; dorsal surface uniformly punctate; punctures small, shallow, smaller or same size as pronotal punctures, not very distinct, distance between punctures more than 2 times puncture diameter, interstices smooth, punctures along lateral margin larger than those in middle of disc; lateral margin with well-developed, smooth carina; elytral apices narrowly rounded. Epipleura broad, smooth; broadest at basal quarter, then gradually and evenly narrowing apically; basal portion concave, inclined inwards, invisible in lateral view; medially horizontal, flat; apically inclined outwards, visible in lateral view. Hind wings absent. Scutellar shield small, widely triangular, barely convex to flat, medially with small convexity.

Abdomen ( Fig. 6 ) short, medially convex, ventrite 1 strongly transverse, somewhat longer than metasternum; medial process of ventrite 1 long, narrow, with triangular apex, its lateral sides with distinct, straight, ridge-shaped margins extending to posterior margin of ventrite; ventrites 2–4 shorter, equal in length, last ventrite transverse with rounded posterior margin; pygidium of female ( Fig. 7 ) with anterior margin rounded, medially with moderately broad glabrous stripe.

Legs short, thin; pro- and mesofemora invisible from above; pro- and mesotibia, tarsi thin; metatibia hardly shorter than femora; viewed from above distinctly curved inward, in lateral view straight; dorsal surface of tibia shallowly channeled, outer margin sharply raised in distal third, its distal half finely and sparsely serrate, inner margin smooth; apical spur of tibia long, thin, longer than width of tibial apices as seen from above; metatarsus 1.7 times shorter than metatibia; tarsomere 1 as long as following 3 combined, thin, straight.

Genitalia. Median lobe of aedeagus in ventral view ( Fig. 8 ) elongate-oval, basal foramen about third of total length, sides evenly rounded; distal portion feebly narrowed, triangular with widely rounded apex; in lateral view ( Fig. 9 ) evenly and weakly curved, apex simple; tegmen Y-shaped, median process short and thin, lateral branches thick and long. Spermatheca ( Fig. 5 ) with pump short and thick, its apex with large process; receptacle oval, thick; duct short, originates away from receptacle, curved towards receptacle, reaching basal third of receptacle, ramus large, situated at distal part of duct; vaginal palpi ( Fig. 10 ) lightly sclerotized, thin, moderately long, parallel-sided, proximally fused, palpus narrowed from proximal end to distal end; setae sparse, long, confined to apical half of palpus, at least twice length of maximum width of palpus; sternite VIII ( Fig. 11 ) small, feebly sclerotized, transparent, its process long and thin, weakly curved.

Body length 1.9–2.0 mm, width 1.5–1.7 mm.

Type material. Holotype ♂. Label : AUSTRALIA QLD, Molvi, Como SF, 4 Oct 1979 G. Kuschel, litter and moss 79/100 ( NZAC) . Paratypes: the same label as holotype, 1 ♂, 10 ♀ (9 NZAC, 2 KN) .

Etymology. The species is named in honor of Chris Reid (Australian Museum, Sydney), a specialist in Chrysomelidae .

Remarks. The new species differs from Ivalia iridescens sp. nov. by the unicolored elytra and brown pronotum (multicolor elytra and black pronotum in I. iridescens ), the ocular sulci shallower and thinner (deeper and broader in I. iridescens ), the vertex distinctly punctate (barely and finely impunctate in I. iridescens ), the apical third of epipleura visible in lateral view (epipleura inclined and invisible in lateral view in I. iridescens ), the metatarsus 1.7 times shorter than tibia (1.6 times shorter than tibia in I. iridescens ), and the median lobe of aedeagus with evenly rounded lateral sides in ventral view and apex with evenly narrowing tip in lateral view (median lobe parallel-sided and apex with swollen tip in I. iridescens ). The new species differs from Ivalia lescheni sp. nov. by coloration of the body, distinctly punctate vertex, longer metatarsus (metatarsus 1.7 times shorter than metatibia in I. reidi , while the same is 1.5 times shorter in I. lescheni ), and the structure of male and female genitalia.

Figures

FIGURE 33. Map of the type localities of Australian Ivalia species. Legend: triangle—Ivalia reidi sp. nov.; square —Ivalia lescheni sp. nov.; circle—valia iridescens sp. nov.

FIGURES 1–4. Ivalia reidi, sp. nov. 1: general appearance, dorsal; 2: general appearance, lateral; 3: head; 4: pronotum, dorsal.

FIGURES 5–11. Ivalia reidi, sp. nov. 5: spermatheca; 6: abdomen, ventral; 7: female pygidium, dorsal; 8: aedeagus, ventral; 9: aedeagus, lateral; 10: vaginal palps; 11: spiculum ventrale.