Portentus Trýzna & Baňař, 2021

Trýzna, Miloš & Baňař, Petr, 2021, Description of a new genus and species, Portentus marschneri (Coleoptera: Anthribidae), from Penang National Park, Malaysia, Zootaxa 5004 (4), pp. 551-563 : 552-553

Portentus Trýzna & Baňař gen. nov.

( Figs 1–22 )

Type species. Portentus marschneri Trýzna & Baňař sp. nov., by original designation.

Placement. Tribe Phloeophilini Lacordaire, 1866

Name derivation. Portentus , gender masculine, from Latin portentosus (peculiar, weird).

Diagnosis. Head elongate, eyes entire, not emarginate. Antennal scrobes visible from above. Antennae shorter, not reaching posterior margin of pronotum, segments of funicle distinctly thick, three-segmented club well-developed, pronotum narrower than elytral base, with two wide, blunt tubercles situated laterally. Dorsal transverse carina distinctly antebasal with very wide posterior pronotal declivity, shortly interrupted in middle, lateral carina of pronotum very short and almost straight, in contact with dorsal transverse carina forming obtuse angle. Elytra suboval, narrowed evenly in distal third of length, each elytron with two tubercles, one in sub-basal and second in median portion of length.

Description. Head ( Figs 1, 3 , 6 ) elongate, eyes of medium size, situated laterally, hemispherical, convex laterally, not emarginate, well-separated from each other (dorsal ocular index ca. 2.00). Rostrum with two longitudinal lateral carinae reaching from posterior margins of scrobes to anterior margins of eyes, space between carinae depressed. Lateral margins of rostrum almost parallel, very slightly expanding anteriorly in dorsal view, anterior part moderately emarginate. Antennal scrobes visible in dorsal view ( Fig. 3 ), margins of scrobes not elevated, carinate at their dorsal margins. Scrobes situated in distal half of rostrum, almost reaching bases of mandibles anteriorly, distant from anterior margin of eyes. Lower side of scrobes ( Fig. 6 ) open posteriorly, this opening of scrobes distinctly visible in dorsal view, dorsal part of rostrum narrowest at this point. Antennae ( Figs 1 , 5, 7 ) short, antennomeres III–VIII of similar lengths and widths, IX triangular, slightly longer than wide, X distinctly wider than long, XI triangular, slightly longer than wide with widely rounded tip. Stalk (= basal-most part of scape) hidden in scrobe in dorsal view, visible part of scape almost spherical, pedicel longer than each of antennomeres III–VIII. Antennae with appressed setae, more visible on club.

Pronotum ( Figs 1–2 , 19–22 ) almost as long as wide, widest in middle. Dorsal and lateral parts of pronotum with very coarse irregular punctation. Disc ( Figs 2, 4 , 19–22 ) with two tubercles in lateral portions, tips of tubercles bluntly rounded. Dorsal transverse carina very slightly bisinuate, shortly, indistinctly interrupted at middle, lateral carinae short, straight, reaching approximately to middle of pronotum. Secondary carina (sensu Holloway, 1982: 21 and 187, Fig. 14 ) absent, with only poorly defined irregularly interrupted transverse callus. Basal longitudinal carinulae of pronotum (sensu Jordan, 1928: 151) (= two carinulae on lateral sides of pronotum, visible in lateral view between dorsal transverse carina and posterior margin of pronotum), present, well-developed, almost straight (see Figs 19–22 ).

Elytra ( Figs 1, 4 ) suboval, sides parallel, narrowed even in distal third of length. Humeri well-developed. Each elytron with two tubercles, one in sub-basal area with apex on elytral interval I, and the second in median area with apex on elytral interval II. Cross-section of sub-basal tubercles rather spherical, that of median tubercles suboval. Elytral declivity decreasing posteriorly immediately from distal margins of median tubercles.

Metanotum ( Fig. 10 ) robust, wide. Hindwing ( Fig. 9 ) with well-developed main veins (not studied in detail).

Legs relatively robust, tarsomere I longer than II, inner tooth of claw present.

Abdomen ( Fig. 8 ) shorter than broad, sternites forming smooth concave arch in lateral view. Pygidium ( Fig. 16 ) wider than long. Abdominal tergites (with partly damaged metapostnotum in its anterior portion) ( Fig. 11 ) I–IV subequal in size, tergites V–VI smaller, spiracula on tergite I much larger than in other tergites (not studied in detail).

Differential diagnosis. We place Portentus gen. nov. in the tribe Phloeophilini Lacordaire, 1866 , based mainly on the following morphological characters: rostrum flat, grooved or with one or two longitudinal carinae; eyes situated lateraly, oval or suboval, not emarginate; dorsal transverse carina of pronotum conspicuous, antebasal, i.e. markedly distant from posterior margin of pronotum, not forming a lateral lobe, in contact with lateral carina forming obtuse angle or wide arch. The new genus can be distinguished from other Palaearctic and Oriental genera by the morphological characters given in the key below:

1 Antennal scrobes distinctly visible in dorsal view. Rostrum without medial groove, only more or less depressed in median area ( Figs 3 , 25 ).......................................................................................... 2

- Antennal scrobes not distinctly visible in dorsal view. Rostrum grooved in basal part, medial longitudinal groove reaching from posterior margin of scrobes to line of middle of eyes or to posterior margin of eyes ( Figs 30 , 35 )...................... 3

2 Dorsal part of antennal scrobes not reflexed and carinate ( Fig. 3, 4 ). Rostrum between margins of scrobes flat and with two lateral longitudinal carinae reaching from anterior margins of eyes to posterior margins of scrobes ( Fig. 3 ). Scape almost spherical, distinctly wider than pedicel, antennae forming a distinctly 3-segmented separate antennal club (in male) ( Figs 1, 3 ). Pronotum with two lateral tubercles on disc, each elytron with two tubercles on the second elytral interval in sub-basal and median areas ( Figs 2, 4 , 19–20 ). Upper side of body with coarse punctation ( Fig. 1, 2 ). Dorsal transverse carina in contact with lateral carina forming obtuse angle, basal longitudinal carinulae of pronotum distinctly developed ( Fig. 20 ).............................................................................................. Portentus Trýzna & Baňař gen. nov.

- Dorsal part of antennal scrobes reflexed and carinate, forming a more or less top-shaped pattern, higher than the apical part of the rostrum ( Fig. 25, 27 ). Rostrum between elevated margins of scrobes depressed, and with one indistinct median longitudinal carina reaching from anterior margins of eyes to area between scrobes ( Fig. 25 ). Scape and pedicel of the same width, antennae from antennomere VIII continuously extended apically, not forming a sharply distinct and separate antennal club (in male) ( Figs 23, 26 ), or only weakly formed (in female). Pronotum and elytra without tubercles ( Figs 23–24, 27 ). Upper side of body with only fine punctation ( Fig. 23 ). Dorsal transverse carina roundly connected with lateral carina, formed in wide arch, basal longitudinal carinulae of pronotum lacking or very weakly developed ( Figs 24, 27 ).................................................................................................. Morimotanthribus Senoh & Trýzna, 2006

3 Two dorso-lateral carinae of rostrum distinct, long, parallel or divergent posteriorly. Central longitudinal groove of rostrum narrow and shallow, not extended apically ( Fig. 30 )................................. Phloeophilus Schoenherr, 1833

- Two dorso-lateral carinae of rostrum indistinct, short, reaching from inner edge of eyes obliquely inwards to central longitudinal groove. Central longitudinal groove wide and very deep, extended apically in shape of letter Y or T ( Fig. 35 ).......................................................................................... Bothrus Wolfrum, 1956

Figures

FIGURES 1–4. Portentus marschneri Trýzna & Baňař sp. nov., male holotype from Malaysia, Penang National Park; 1, dorsal habitus; 2, pronotum in dorsal view; 3, head in dorsal view; 4, lateral habitus. Scale bars in mm.

FIGURES 5–8. Portentus marschneri Trýzna & Baňař sp. nov., male holotype; 5, ventral habitus (all left tibiae and tarsi omitted); 6, head in ventral view; 7, right antenna in dorsal view; 8, abdomen in ventral view. Scale bars in mm.

FIGURES 9–11. Portentus marschneri Trýzna & Baňař sp. nov., male holotype; 9, right hindwing; 10, metanotum in dorsal view; 11, abdominal tergites in dorsal view. Scale bars in mm. Abbreviations: A1, A2, A3 = anal vein 1, 2, 3 respectively; Ac = anal cell; alc = alacrista; C = costa; Cu = cubitus; J = jugal vein; M = media; R = radius; Rc = radial cell; Rs = radial sector; Sc = subcosta; sc3 = metascutum; scl3 = metascutellum.

FIGURES 12–18. Portentus marschneri Trýzna & Baňař sp. nov., male holotype; 12, aedeagus in ventral view; 13, apex of aedeagus in ventral view; 14, segment VIII in ventral view; 15, sternite of segment IX (= spiculum gastrale) in ventral view; 16, pygidium in dorsal view; 17, apex of tegmen in ventral view; 18, tegmen in ventral view. Scale bars in mm.

FIGURES 19–22. Portentus marschneri Trýzna & Baňař sp. nov., male holotype, pronotum; 19, 21, dorsal view; 20, 22, left side in lateral view; 21–22, schematic; BLC = basal longitudinal carinula; BR = basal rim; DTC = dorsal transverse carina; LC = lateral carina; PD = pronotal declivity; TC = transverse callus.

FIGURES 23–27. Morimotanthribus leigongshani Li, Trýzna & Guo, 2019, male paratype from China, W Guizhou prov., Leigongshan, Xijiang; 23, dorsal habitus; 24, pronotum in dorsal view; 25, head in dorsal view; 26, right antenna in dorsal view; 27, lateral habitus. Scale bars in mm.

FIGURES 28–32. Phloeophilus oculatus (Jordan, 1904), male from Laos, Phongsaly prov., Phongsaly env.; 28, dorsal habitus; 29, pronotum in dorsal view; 30, head in dorsal view; 31, right antenna in dorsal view; 32, lateral habitus. Scale bars in mm.

FIGURES 33–37. Bothrus aspersus (Jordan, 1923), male from Thailand, Chiang Mai env.; 33, dorsal habitus; 34, pronotum in dorsal view; 35, head in dorsal view; 36, right antenna in dorsal view; 37, lateral habitus. Scale bars in mm.