Three new species of the genus Rhyzobius Stephens, 1829 from New Guinea (Coleoptera: Coccinellidae: Coccidulini) Author Czerwiński, Tomasz B7AF2729-3590-48B3-A065-7825623EF8B3 Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679 Warszawa, Poland. tczerwinski@miiz.waw.pl Author Szawaryn, Karol D741C759-6CDD-4B61-BE93-3ECC2918A73F Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679 Warszawa, Poland. k.szawaryn@gmail.com Author Tomaszewska, Wioletta F2A77E2D-E0FF-45F8-8035-B49DC1418F99 Museum and Institute of Zoology, Polish Academy of Sciences, Wilcza 64, 00 - 679 Warszawa, Poland. wiolkat@miiz.waw.pl text European Journal of Taxonomy 2020 2020-07-28 692 1 17 journal article 21377 10.5852/ejt.2020.692 ed3d3142-6449-4d72-bea7-51186ee48f37 3973317 EF16E197-0A18-45A9-8BA7-5C9154CDF4C3 Rhyzobius albinos sp. nov. urn:lsid:zoobank.org:act: BA648A58-DE41-49CE-B3DA-F7D06F2E868C Figs 1 A–D, 2A–I, 4A–C, 5A–D Diagnosis This species is most similar to R . poorani Tomaszewska, 2010 and R . jaya Tomaszewska, 2010 in body colouration. However, R . albinos sp. nov. differs from R . poorani by having simple, not swollen pronotal anterior corners and a prosternal process with complete lateral carinae, joined anteriorly in the form of a triangle. Rhyzobius jaya has a smooth prosternal process without carinae, and straight ventral antennal grooves reaching beyond the posterior margin of the eyes, whereas R . albinos sp. nov. has ventral antennal grooves distinctly circularly bent towards the outer margin of the eyes. From all other New Guinean species of Rhyzobius , R . albinos sp. nov. can be distinguished by the bright, almost white ventral body surface, excluding meso- and metaventrite. Etymology The specific epithet is a noun in apposition, it means ‘albino’ in Polish and refers to the bright colouration of most of the ventral surfaces, not observed in other species of Rhyzobius . Material examined Holotype NEW GUINEA • ♂ ; Madang Province , Mt Wilhelm , Bananumbo ; 5º45ʹ33.4ʺ S , 145º14ʹ08.2ʺ E ; 1700 m a.s.l. ; 9–11 Nov. 2012 ; “06686- CoCocc Ibisca Niugini 2012”; FIT-MW1700-O-8/8-d16; plot 15, order 17260; MNHN . Paratypes NEW GUINEA – Madang Province • 1 ♂ ; same collection data as for holotype; MNHN • 1 ♂ ; Mt Wilhelm ; 2200 m a.s.l.; 18–20 Oct. 2012 ; “04064-CoCocc Ibisca Niugini 2012”; FIT-MW2200-C- 2/8-d03; plot 3, order 1603; MNHN • 1 ♂ ; Mt Wilhelm ; 2200 m a.s.l.; 19–21 Oct. 2012 ; “09588-CoCocc Ibisca Niugini 2012”; FIT-MW2200-C-2/8-d04; plot 11, order 6111; MNHN • 1 ♂ ; Mt Wilhelm ; 1200 m a.s.l.; 29–31 Oct. 2012 ; “16881-CoCocc Ibisca Niugini 2012”; FIT-MW1200-J-3/8-d05; plot 10, order 6033; MNHN • 1 ♂ ; Mt Wilhelm ; 1700 m a.s.l.; 27–29 Oct. 2012 ; “P1927-CoCocc Ibisca Niugini 2012”; FIT-MW1700-G-2/8-d03; plot 7, order 18341; MNHN • 1 ♂ ; Mt Wilhelm ; 2200 m a.s.l.; 20–22 Oct. 2012 ; “P2334-CoCocc Ibisca Niugini 2012”; FIT-MW 2200-I-3 /8-d05; plot 9, order 18623; MNHN • 1 ♂ ; Mt Wilhelm ; 1700 m a.s.l.; 9–11 Nov. 2012 ; “06696-CoCocc Ibisca Niugini 2012”; FIT-MW1700- S-8/8-d16; plot 19, order 5202; MIZ • 1 ♂ ; Mt Wilhelm ; 2200 m a.s.l.; 27–29 Oct. 2012 ; “02308-CoCocc Ibisca Niugini 2012”; FIT-MW2200-N-6/8-d12; plot 14, order 1630; MIZ • 1 ♂ ; Mt Wilhelm ; 2200 m a.s.l.; 20–22 Nov. 2012 ; “P2294-CoCocc Ibisca Niugini 2012”; FIT-MW2200-D-3/8-d05; plot 4, order 18478; MIZ. Type locality Papua New Guinea , Madang Province , Mt Wilhelm, Bananumbo. Description MEASUREMENTS. Length 2.00– 2.25 mm ; TL/EW = 1.42–1.50; PL/PW = 0.52–0.56; EL/EW = 1.06–1.07. BODY ( Figs 1 A–C, 2A). Moderately oval and convex dorsally, winged; with antennae, mouthparts, hypomera, apex of elytra, most of abdominal ventrites and legs except coxae whitish; frons, anterior and lateral margins of pronotum, preapical parts of elytra, prosternum, epipleura, coxae and partially abdominal ventrite 1 pale brown; vertex, posterior and central parts of pronotum, most of elytra, meso- and metaventrite blackish or dark brown. Elytra with weak bluish, metallic sheen. Dorsum with moderately long and uniform pubescence, not forming pattern on elytra. Elytral bristles absent. HEAD ( Fig. 1D ). Dorsally exposed with eyes almost entirely visible; ventral antennal grooves distinctly circularly bent towards outer margin of eye; corpotentorium absent. Eyes dorsally with inner orbits arcuate, closest at middle; ocular canthus distinct; interocular distance 0.50–0.52 times as wide as head across eyes; interfacetal setae distinct. Antenna ( Fig. 2B ) 0.77–0.80 times as long as head capsule width, composed of 11 antennomeres; scape 1.65–1.70 times as long as pedicel; pedicel narrower than scape, barrel-shaped, 1.25–1.28 times as long as wide; antennomere 3 about 2.5 times longer than wide, and 2.15–2.30 times as long as antennomere 4; antennomere 4 as long as 5; antennomeres 6 and 7 quadrate. Antennal club consisting of 3 antennomeres, with two subterminal segments asymmetrical; penultimate antennomere as long as terminal one; terminal antennomere rounded apically. Anterior clypeal margin ( Fig. 2E ) distinctly emarginate with rounded lateral lobes and median area membranous. Labrum truncate at apex. Maxillary cardo transverse with outer angle reaching slightly outside of mouth cavity; terminal palpomere 1.30–1.35 times as long as wide, expanded apically. Mentum weakly transverse, 1.5 times as broad as long; anterior margin weakly arcuate; ventral surface with horseshoe-like impression; prementum transverse; ligula parallel-sided; labial palps separated by distance about equal to width of palpiger; apical palpomere as long and as broad as penultimate one; submentum distinct. Fig. 1. Habitus of new species of Rhyzobius spp. (holotypes). A–D . R . albinos sp. nov. , ♂ (MNHN). E–H . R . atramentarius sp. nov. , ♂ (MNHN). I–L . R . serratus sp. nov. , ♂ (MNHN). A , E , I . Dorsal view. B , F , J . Ventral view. C , G , K . Lateral view. D , H , L . Frontal view. Scale bars = 0.5 mm. PRONOTUM ( Fig. 2F ). With anterolateral angles rounded, scarcely produced anteriorly, not swollen with regular border; anterior and hind margin without border; lateral margin with entire border. Prothoracic hypomeron with weak, broad, concave area along anterior half of prothoracic lateral margin; notosternal suture weakly visible, simple; prosternal process ( Fig. 2G ) 0.55 times as broad as longest coxal diameter, its surface with lateral carinae complete, convergent and joined anteriorly forming a triangle; prosternum in front of coxa about 0.45 times as long as coxal longitudinal diameter at the same position; anterior margin continuing as weakly arcuate line, much more posterior than anterior pronotal margin; procoxal cavity distinctly transverse, without visible bordering line. PTEROTHORAX. Anterior margin of mesoventrite with complete raised border ( Fig. 2G ); mesoventral process at median length of coxa 1.25–1.30 times as broad as corresponding coxal diameter; mesometaventrite articulation with suture visible; junction angulate posteriorly. Scutellar shield transverse, triangular; surface punctate and setose. Elytra with sides subparallel; with lateral margins very narrow but entirely visible from above; surface with single size punctures ( Fig. 2I ), elytral epipleuron comparatively narrow, 1.5 times as wide as corresponding metaepisternum, incomplete apically ( Fig. 2A ), inner margin with border area narrow throughout and border line fading before base of elytron. Metaventrite with discrimen long but incomplete anteriorly; metaventral postcoxal lines distinctly separated at middle, laterally complete and recurved; metaepisternum with external process interlocking with fovea on elytron; metaepimeron indistinct. LEGS. With trochanters angulately produced ( Fig. 2A , G–H); tibiae without visible apical spurs; fore and mid tarsal claws appendiculate ( Fig. 2C ); metatarsal claws with quadrate basal tooth ( Fig. 2D ). ABDOMEN ( Figs 2H , 4A ). With five ventrites, ventrite 6 partially visible; ventrite 1- 1.6 times as long as ventrite 2; abdominal postcoxal lines separate medially, recurved and complete anteriorly, deep, posteriorly almost reaches ventrite 2; hind margin of ventrite 5 covered with long setae and deeply emarginate; hind margin of ventrite 6 weakly emarginate, tergite VIII widely truncate apically ( Fig. 4B ). MALE TERMINALIA AND GENITALIA ( Figs 4C , 5 A–D). Sternite IX with central part membranous ( Fig. 4C ); apodeme of male sternum IX with its apical half rod-like, base of spiculum broadly widened. Penis base with outer arm reduced, inner well developed; penis apex as in Fig. 5 A–B. Parameres ( Fig. 5 C–D) articulated with phallobase, well developed, simple and separated, slightly longer than penis guide, with apices covered with long setae; penis guide simple, subtriangular in inner view, without additional processes, with acute apex and lateral sides symmetrical throughout and pointed apex; tegminal strut simple, slightly expanded at apex. Female. Not known. Fig. 2. SEM images of Rhyzobius spp. (holotypes). A–I . R . albinos sp. nov. , ♂ (MNHN). J . R . atramentarius sp. nov. , ♂ (MNHN). A . Habitus, ventral. B . Antenna. C . Protarsal claws. D . Hind tarsal claws. E . Head, ventral. F . Pronotum. G . Pro-, meso- and metathorax, ventral. H . Abdomen, ventral. I–J . Details of elytral punctation. Scale bars: A = 1.00 mm; B = 0.2 mm; C–D = 0.1 mm; E–F = 0.3 mm; G = 0.4 mm; H–J = 0.5 mm. Distribution Papua New Guinea : Mt Wilhelm.