Meligethinus Grouvelle, 1906

Audisio, Paolo, Cline, Andrew Richard, Biase, Alessio De, Antonini, Gloria, Mancini, Emiliano, Trizzino, Marco, Costantini, Lorenzo, Strika, Sirio, Lamanna, Francesco & Cerretti, Pierfilippo, 2009, Preliminary re-examination of genus-level taxonomy of the pollen beetle subfamily Meligethinae (Coleoptera: Nitidulidae), Acta Entomologica Musei Nationalis Pragae 49 (2), pp. 341-504 : 452-456

publication ID

https://doi.org/ 10.5281/zenodo.5319334

persistent identifier

https://treatment.plazi.org/id/03BE87CC-F605-FFF7-BAAB-FF2FFC27FE64

treatment provided by

Felipe

scientific name

Meligethinus Grouvelle, 1906
status

 

31. Meligethinus Grouvelle, 1906

( Figs. 31 a–m View Fig )

Meligethinus Grouvelle, 1906: 202 . Prianella Reitter, 1919: 16 . Senior homonym of Prianella Lechanteur, 1955: 238 .

Type species. Meligethinus Meligethinus humeralis Grouvelle, 1906: 202 (by monotypy); Prianella Pria pallidula Erichson, 1843 (by monotypy).

Generic redescription and diagnosis. Inclusive species vary greatly in size (1.2–3.0 mm length), and share the following combination of characters.

Body color and pubescence: pubescence short and fine, silvery-whitish to golden, never obscuring the usually dull and densely isodiametrically reticulate, yellowish-ochraceous to partially blackish-brown ( Figs. 31a, b View Fig ) dorsal body surface; pronotal and elytral sides narrowly flattened, typically same color as disc or paler; lateral margin of pronotum and elytra with a series of faintly distinct, small, and short setae, each seta 0.3–0.5× as long as those on elytral disc; posterior margin of pronotum with moderately long, usually distally bifid or trifid microsetae ( Fig. 31d View Fig ), microsetae also uniformly distributed on middle region anterior to scutellum.

Dorsal habitus: body small, usually flatly convex, variably shaped ( Figs. 31a, b View Fig ; Figs. 1 View Fig , 12 View Fig , 24 View Fig in KIREJTSHUK 1980b; Figs. 33–34 View Fig View Fig in JELÍNEK 1992), pronotum as wide as or slightly more narrow than elytra; dorsal punctures on discal portion of pronotum and elytra usually fine, smaller than eye facet, moderately to shallowly impressed and densely distributed; anterior margin of clypeus usually truncate, rarely sinuate, narrowly but distinctly bordered, without small, faintly distinct, medial bulge, lateral angles obtuse ( Fig. 31c View Fig ; Figs. 2 View Fig , 13 View Fig , 25 View Fig in KIREJTSHUK 1980b); circum-ocular furrows (occipital sulci) on dorsal side of head absent; eyes moderately large and projecting laterally ( Figs. 31a, b View Fig ); pronotum with distinct and nearly right posterior angles, or slightly acute and more or less distinctly projecting posteriorly ( Figs. 31a, b View Fig ; Figs. 1 View Fig , 12 View Fig , 24 View Fig in KIREJTSHUK 1980b; Figs. 33–34 View Fig View Fig in JELÍNEK 1992); lateral area adjacent to posterior outer portions of pronotum normally punctate and setose; scutellum minutely and densely punctured on most of exposed portion; elytra usually finely and densely discretely punctured to almost completely and finely transversely strigose; elytral humeral angle faintly projecting laterally, frequently obscured by posterior corner of pronotum; elytral humeral striae scarcely distinct or indistinct; elytral pre-sutural striae visible, variable, originating at scutellar vertex or more posteriorly, terminating slightly before elytral apex, and delimiting on each elytron a flat sutural area, widest at posterior third, some species (i.e. the western Palaearctic M. pallidulus and M. gedrosiacus ) with sutural area faintly distinct and nearly as wide as distal width of 3 rd antennomere, in other species (i.e. the southern African M. dolosus ) the sutural area is markedly distinct at least posteriorly and much wider than distal width of third antennomere; elytral apices truncately rounded in both sexes ( Fig. 31a View Fig ), or slightly lobed in females; pygidium partially exposed, moderately convex, apically rounded in both sexes ( Fig. 31a View Fig ; Figs. 1 View Fig , 12 View Fig , 24 View Fig in KIREJTSHUK 1980b), rarely with obliquely outstanding predistal conical projections in females ( Fig. 31b View Fig ).

Ventral habitus: antennal furrows markedly delimited, parallel-sided anteriorly, strongly convergent posteriorly; mentum subpentagonal, moderately transverse, trapezoidal ( Fig. 31e View Fig ); prosternal antennal furrows on anterior margin of prosternum obliterated, indistinct ( Fig. 31e View Fig ); prosternal process variably shaped, usually wide, subapical dilated portion 2.5–3.5× as wide as maximum width of 1 st antennomere, apex convex ( Fig. 31f View Fig ; Figs. 5 View Fig , 16 View Fig in KIREJ- TSHUK 1980b; Fig. 44 in JELÍNEK 1992), posterior margin not microscopically crenulate; lateral borders of prosternal process not delimiting distinct furrows, distally terminating before or over predistal lateral expansions; posterior margin of mesoventrite never medially incised, transversely truncate ( Fig. 31f View Fig ); deep male impressions on metaventrite typically absent; first two visible abdominal ventrites simple in both sexes, without tufts of setae; caudal marginal lines of metacoxal cavities simple, subparallel and contiguous to posterior margin of metacoxal cavities, with shallow arched impression of outer ‘axillary’ line ( Fig. 31h View Fig ); ‘axillary’ space on first abdominal ventrite well developed, ‘axillary’ angle widely or broadly widely obtuse ( Fig. 31h View Fig ); variably impressed arched impressions on basal portion of last visible abdominal ventrite: small, short, shallow, and moderately close to lateral margins of ventrite, frequently largely or almost completely obscured by distal portion of penultimate visible abdominal ventrite ( Fig. 31g View Fig ) in the two W Palaearctic species; arched impressions much larger and deeper in some African and Oriental species (Fig. 40 in JELÍNEK 1992), or exceptionally large in the southern African M. dolosus ( COOPER 1980, AUDISIO unpublished); apex of last abdominal ventrite usually simple in males, rarely distinctly emarginate in females (Fig. 40 in JELÍNEK 1992), without shining tubercles or arcuate ridges in both sexes.

Appendages: male1 st antennomere small, 0.8–0.9× as long as width of protibiae excluding distal teeth ( Fig. 31a View Fig ); 3 rd antennomere usually long and slender in both sexes, 2.3–2.8× as long as wide, 1.2–1.5× longer and distinctly thinner than 2 nd antennomere; 4 th antennomere usually longer than 5 th antennomere in both sexes, moderately long, nearly 1.5–1.8× longer than wide; antennal club small or mid-sized, nearly as wide as width of protibiae, compact and rounded or loose and narrow, especially in males ( Fig. 31m View Fig ), simple, comprising last 3 antennomeres in both sexes (8 th antennomere scarcely widened, 0.4–0.5× as wide as 9 th antennomere), sexual dimorphism variably expressed; labial palpi moderately short in both sexes ( Fig. 31e View Fig ), terminal segment 1.3–1.6× as long as wide; maxillary palpi long and thin in both sexes, terminal segment 2.6–3.1× as long as wide ( Fig. 31e View Fig ); mandible mid-sized, apex moderately acuminate, no sexual dimorphism usually present; tarsal claws simple, not toothed at base ( Fig. 31g View Fig ); tarsi of normal size, 0.6–0.7× as long as corresponding tibiae ( Fig. 31a View Fig ); protibiae with a series of small and relatively blunt teeth on distal portion of lateral margin ( Fig. 31a View Fig ; Figs. 5 View Fig , 16 View Fig in KIREJTSHUK 1980b); lateral margin of meso- and metatibiae bearing a single and usually even row of short and thin pegs ( Figs. 31a, k View Fig ; Figs. 8 View Fig , 20 View Fig in KIREJTSHUK 1980b; Fig. 45 in JELÍNEK 1992), without U-shaped sinuosity at distal third; meso- and metatibiae variably shaped, flat, usually short and wide, rarely slender, frequently subtrapezoidal and axe-shaped ( Fig. 31a View Fig ; Figs. 8 View Fig , 20 View Fig in KIREJTSHUK 1980b; Fig. 45 in JELÍNEK 1992); sexual dimorphism variably expressed in metatibial shape in most species, rarely with marked projections on inner metatibial margin in males (Fig. 45 in JELÍNEK 1992); tarsal plates of prolegs usually distinctly wider in males; posterior margin of metafemora simple in both sexes, without tubercles or projections.

Male genitalia: variably shaped, processes along inner side of parameres absent ( Figs. 14–17 View Fig View Fig View Fig View Fig , 20– 23 View Fig View Fig View Fig View Fig in COOPER 1980; Figs. 9–10 View Fig View Fig , 21– 22 View Fig View Fig in KIREJTSHUK 1980b; Figs. 47–48 in JELÍ- NEK 1992; Figs. 114 a–b in AUDISIO 1993b), usually with narrow and deep incision on distal margin, without deep median longitudinal desclerotization from proximal portion of tegmen extending to medio-distal V-shaped excision; median lobe of aedeagus variably shaped, without lateral emargination, narrow and obtuse, distally acuminate or spatulate, without minute excisions or emarginations.

Female genitalia (ovipositor): variably shaped, relatively large; styli long or short, cylindrical, never darkly pigmented, inserted at apex of contiguous or markedly divergent gonostyloids ( Figs. 24–25 View Fig View Fig , 27– 28 View Fig View Fig in COOPER 1980; Figs. 11 View Fig , 23 View Fig in KIREJTSHUK 1980b; Figs. 41 View Fig , 49 in JELÍNEK 1992; Figs. 114 g in AUDISIO 1993b); each gonostyloid lightly sclerotized, never darkly pigmented distally, with a simple, never indentate outer portion of variably shaped basicoxites, and a single, narrow, pigmented and sclerotized arcuate area along outer subdistal portion of gonostyloids. ‘Central point’ of ovipositor usually located more proximad than middle, or centrally located, with or without proximad directed spicule.

Etymology. The generic name is a diminutive of Meligethes , which is indicative of the usually small and slender body sizes characterizing most of inclusive species. Gender masculine.

Biology. All true Meligethinus , whose larval biology is known, are strictly associated with male inflorescences of palms ( Arecaceae ) ( AUDISIO 1980, 1993b, and unpublished data; JELÍNEK 1992).

Phylogenetic position. Available molecular and morphological data provide strong combined evidence of a likely sister-group relationship of Meligethinus with the clade [ Meligethes + Brassicogethes gen. nov.] ( TRIZZINO et al. 2009, LAMANNA 2009); morphologically, Micropria should also be related to this clade ( KIREJTSHUK 1980b, JELÍNEK 1992). A marginal phylogenetic relationship may also be hypothesized with the small Oriental clade [( Cryptarchopria + Horakia ) + Kabakovia ].

Taxonomy and geographic distribution. This taxon includes 15 described species. Inclusive species exhibit a high degree of morphological differentiation, and there is a strong need to employ molecular phylogenetic protocols to clarify the taxonomic position of many of the derived species. Most species are distributed in tropical Africa and southeastern Asia, with a couple relictual species known from western Mediterranean and Irano-Arabic areas ( COOPER 1980; KIREJTSHUK 1980b; JELÍNEK 1981, 1988, 1992; AUDISIO 1993b; JELÍNEK & AUDISIO 2007). The two Mediterranean-Arabian species (i.e. M. pallidulus and M. gedrosiacus ) and a few Oriental species could possibly be attributed to a separate genus ( Prianella Reitter, 1919 ), however the entire group needs a complete phylogenetic and taxonomic revision prior to any further changes.

An additional species described by KIREJTSHUK (1989), i.e. Meligethinus larioides Kirejtshuk, 1989 , from South Africa: Cape Peninsula, is a member of Pria (AUDISIO unpublished data; holotype in BMNH). Likewise, the species described by KIREJTSHUK (1989) as Meligethinus formosus Kirejtshuk, 1989 , is a member of Chromogethes (see above). Finally, a few South African species described as Meligethinus by KIREJTSHUK & EASTON (1988), have been transferred here to Tarchonanthogethes gen. nov. (see above).

Meligethinus absonus Kirejtshuk, 1987 India: Uttar Pradesh; Vietnam

Meligethinus apicalis (Grouvelle, 1894) NE India, S China

Meligethinus bisignatus Kirejtshuk, 1980 Zaire, Rwanda

Meligethinus dolosus Grouvelle, 1919 E South Africa or S Zimbabwe?

Meligethinus gedrosiacus Jelínek, 1981 S Iran, Arabian Peninsula

Meligethinus grouvellei Kirejtshuk, 1980 India

Meligethinus humeralis Grouvelle, 1906 Zaire, Angola, Rwanda

Meligethinus kabakovi Kirejtshuk, 1980 Vietnam

Meligethinus muehlei Jelínek, 1992 Rwanda

Meligethinus pallidulus (Erichson, 1843) W Mediterranean

Meligethinus peringueyi ( Grouvelle, 1919) E South Africa or S Zimbabwe?

Meligethinus plagiatus (Grouvelle, 1894) India: Darjeeling; Vietnam, Taiwan

Meligethinus quadricollis Kirejtshuk, 1987 India: Uttar Pradesh

Meligethinus suffusus Kirejtshuk, 1980 Zaire

Meligethinus tschungseni Kirejtshuk, 1987 China: Fujian, Sichuan, Yunnan

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Nitidulidae

Loc

Meligethinus Grouvelle, 1906

Audisio, Paolo, Cline, Andrew Richard, Biase, Alessio De, Antonini, Gloria, Mancini, Emiliano, Trizzino, Marco, Costantini, Lorenzo, Strika, Sirio, Lamanna, Francesco & Cerretti, Pierfilippo 2009
2009
Loc

Meligethinus

LECHANTEUR F. 1955: 238
REITTER E. 1919: 16
1919
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