Anthobium longicorne (Fauvel, 1886)

Shavrin, Alexey V., 2024, Review of the genus Anthobium Leach, 1819 (Coleoptera: Staphylinidae: Omaliinae) of Western Palaearctic region, Zootaxa 5537 (4), pp. 451-474 : 458-459

Anthobium longicorne (Fauvel, 1886)

( Figs 6 , 14–16 , 19 )

Lathrimaeum longicorne Fauvel, 1886a: 15 [= 1886b: 7]; Fauvel 1902: 56, Luze 1905: 62, Bernhauer & Schubert 1910: 65, Coiffait 1973: 269.

Lathrimaeum (Lathrimaeum) longicorne : Scheerpeltz 1961: 78.

Type material examined. Lectotype (here designated) of Lathrimaeum longicorne Fauvel, 1886 ♂ ( Fig. 6 ; right antennomeres 3–11 and right fore leg missing): ‘Teniet el H. | f. de cèdres 6’ <printed>, ‘longicorne | Fvl.’ <handwritten in black Indian ink>, ‘R.I.Sc.N.B. 17.479 | Lathrimaeum [handwritten] | Coll. et. det. A. Fauvel’ <printed>, ‘Syntype’ <label printed in red, with narrow black margin>, ‘ LECTOTYPE | Lathrimaeum | longicorne Fauvel, 1886 | Shavrin A.V. des. 2024’ <red, printed>, ‘ Anthobium | longicorne (Fauvel, 1886) | Shavrin A.V. det. 2024’ <printed> ( IRSNB).

Additional material examined. ALGERIA: 1 ♂, 1 ♀: Djurdjura Tikjida [=Tigejda]. 06.05.1988. I. Löbl & D. Burckhardt leg. ( MHNG) ; 1 ♂, 1 ♀: ‘ Mt. Babor Algérie’ , ‘ R.I.Sc. N.B. 17.479 Lathrimaeum Coll. et. det. A. Fauvel’ ( IRSNB) ; 1 ex.: ‘ Algerie Deyrolle’ ( ZIN) .

Redescription. Measurements (n=5): HL: 0.50–0.56; HW: 0.81–0.86; AL: 1.46 (holotype); OL: 0.20–0.22; PL: 0.68–0.73; PW: 1.27–1.38; ESL: 1.60–1.82; EW: 1.61–1.81; AW: 1.15–1.23; MTbL: 0.90 (holotype); MTrL (holotype): 0.37 (MTrL 1–4: 0.22; MTrL 5: 0.15); AedL: 0.77–0.80; TL: 3.55 (holotype)–4.10.

Habitus as in Fig. 6 . Forebody glossy; body reddish-brown, with darker head and abdomen; antennomeres 4–11 brown; mouthparts, antennomeres 1–3 and legs yellow to yellow-brown. Head without microsculptue except of apical part of clypeus with fine transverse microreticulation and latero-basal portions with fine and dense transverse meshes; neck with fine transverse sculpture; abdomen with dense transverse microsculpture; pronotum, scutellum and elytra without microreticulation; abdomen with distinct fine sculpture. Head with sparse and fine punctation in frontal portion, denser, larger and deeper in middle, denser and finer in postocular parts; punctation of pronotum about as that in middle part of head, sparser in middle in some specimens, with small impunctated area in mediobasal third; neck with regular, moderately sparse and large punctation; punctation of elytra about as that on pronotum, finer and sparser in middle; scutellum with several fine punctures; punctation of elytra dense, about as that on pronotum, denser around scutellum and sparser along suture, each elytron bearing five to six very tangled and vague longitudinal rows of punctures, some secimens with indistinct and irregular two to three longitudinal elevations in middle portion; abdominal tergites with fine and sparse punctation.

Head 1.5–1.6 times as broad as long, with distinctly elevated median portion narrowed toward base and lateral portions between middle and eyes widely and deeply depressed; anteriomedian depressions moderately wide and deep, connected with wide and deep lateral depressions; anteocellar foveae missing; postocular ridges acute, with interspaces between posterior margin of eyes and ridge about as long as two-three ommatidia; anterior portion between antennal insertion and anterior margin of eye with distinct small and deep semicicrular notch. Ocelli large, located about level of postocular ridges; distance between ocelli distinctly broader than distance between ocellus and posterior margin of eyes. Eyes large and convex. Antenna reaching basal third of elytra when reclined; basal antennomere about three times as long as broad, basal part significantly broadened apically, antennomere 2 distinctly shorter and narrower than basal antennomere, 3 longer and slightly narrower than 2, 4–6 distinctly shorter than 3, 7 slightly shorter than 6, 8–9 distinctly shorter than 7, 10 shorter than 9, apical antennomere about 1.3 times as long as penultimate antennomere, from about middle gradually narrowed toward subacute apex.

Pronotum transverse, 1.8 times as broad as long, distinctly narrower than head, from widest middle gradually narrowed both anteriad and posteriad; posterior angles obtuse, latero-basal margins not concave; apical angles strongly protruded anteriad; apical margin slightly rounded or somewhat straight, distinctly shorter than slightly rounded or straight posterior margin; middle portion distinctly elevated, sometimes with indistinct longitudinal and fine or moderately deep mediobasal impressions; lateral portions relatively wide and slightly reflexed, with deep oval pit about in middle.

Elytra about as long as broad, distinctly more than twice as long as pronotum, reaching apical margin of abdominal tergite IV–V, slightly broadened toward preapical portion, with widely rounded apical angles; humeri widely rounded, not protruded anteriad; middle surface of each elytron with three indistinct diagonal elevations between punctures; latero-apical edges without crenulation. Hind wings fully developed.

Legs moderately long and slender, with dense and strong setae on outer margins of tibiae (especially in meso- and metatibiae), with additional short and moderately dense setae on inner sides; metatarsi more than twice shorter than metatibia.

Abdomen convex, distinctly narrower than elytra, with a pair of small transverse tomentose spots in the middle of abdominal tergite V, with narrow palisade fringe on apical margin of abdominal tergite VII.

Male. Apical margins of abdominal tergite VIII and sternite VIII sinuate. Aedeagus from basal portion slightly broadened toward middle and slightly narrowed toward widely rounded apex; parameres moderately narrow, indistinctly exceeding apex of median lobe, with slightly broadened preapical portions, with three short apical setae; internal sac long and narrow ( Figs 14, 16 ). Lateral aspect of the aedeagus as in Fig. 15

Female. Apical margins of abdominal tergite VIII truncate. Apical margin of abdominal sternite VIII rounded.

Comparative notes. Based on the general shape, length and coloration of the shiny body, A. longicorne is more similar to A. metallicum , from which can be distinguished by the longer antennomeres 9–10, denser punctation of the head and the pronotum, longer aedeagus, with broader apical portion, and shorter parameres with narrower apical parts.

Distribution. Anthobium longicorne is known from several localities in Morocco and Algeria ( Fig. 19 ).

Bionomics. The detailed bionomical data are unknown.

Remarks. Lathrimaeum longicorne was originally described based on unspecified number of syntypes from “Teniet-el-Had, forêt des Cèdres…”. I study the male ( Fig. 6 ) from IRSNB with the same locality, and designate it as the lectotype in order to fix the identity of the name. Coiffait (1973) recorded it from northern Morocco. The habitus and the aedeagus of A. longicorne are illustrated for the first time.

Figures

FIGURES 1–6. Habitus of Lathrimaeum (types) and Anthobium: 1–L. gracilicorne (holotype), 2–L. abantense (holotype), 3–L. urgelense (holotype), 4–L. hamatum (holotype), 5–A. melanocephalum (Georgia: Svaneti), 6–L. longicorne (lectotype). Scale bar: 1.0 mm.

FIGURES 13–17. Aedeagus of Anthobium (Figs 13–14: A. longicorne (Algeria, Tikjida), Fig. 15: L. longicorne (Algeria, Babor Mt.), Figs 16–17: A. metallicum (Turkey, Isparta): 13, 15–16–parameral view, 14, 17–lateral view. Scale bar: 0.1 mm.

FIGURES 19–23. Habitus of Lathrimaeum (types) and Anthobium: 19–L. moczarskii (holotype), 20–L. metallicum (holotype), 21–L. tenue (lectotype), 22–L. laterale (holotype), 23–A. ganglbaueri (Turkey, Ulu Dað). Scale bar: 1.0 mm.