Ochthephilus angustatus ( Erichson, 1840 )

Makranczy, György, 2014, Revision of the genus Ochthephilus Mulsant & Rey, 1856 (Coleoptera: Staphylinidae, Oxytelinae), Revue suisse de Zoologie 121 (4), pp. 457-694 : 488-492

Ochthephilus angustatus ( Erichson, 1840) Figs 54-58, 68, 69, 70, 87, 516

Trogophloeus angustatus Erichson, 1840: 803 . – Rosenhauer, 1856: 83. – Fairmaire & Laboulbène, 1856: 615.

Ancyrophorus angustatus (Erichson) . – Kraatz, 1857: 890. – Ganglbauer, 1895: 669. – Jarrige, 1949: 60. – Scheerpeltz, 1950: 60.

Ochthephilus angustatus (Erichson) . – Mulsant & Rey, 1856a-b: 2. – Herman, 1970: 384.

TYPE MATERIAL EXAMINED: Trogophloeus angustatus – LECTOTYPE (here designated): “6735 \ angustatus Er. ; Bavar. Waltl. \ Hist.-Coll. ( Coleoptera ); Nr. 6735; Trogophloeus angustatus ; Erichson; Bavaria, Waltl; Zool. Mus. Berlin \ Lectotypus; Trogophloeus; angustatus Erichson ; [on the back] des. Makranczy, 1999 \ Ochthephilus ; angustatus Erichson ; det. Makranczy, 1999” ( ZMHB).

OTHER MATERIAL: see Appendix.

REDESCRIPTION: Forebody as in Fig. 516. Measurements (n=10): HW = 0.50 (0.46-0.53); TW = 0.48 (0.45-0.51); PW = 0.53 (0.47-0.58); SW = 0.61 (0.55-0.67); AW = 0.70 (0.61-0.81); HL = 0.41 (0.38-0.46); EL = 0.14 (0.13-0.15); TL = 0.13 (0.12- 0.13); PL = 0.46 (0.43-0.50); SL = 0.85 (0.78-0.92); SC = 0.77 (0.70-0.83); FB = 1.77 (1.67-1.91); BL = 3.30 (2.98-3.59) mm. Head, pronotum and abdomen dark brown with reddish tint, pronotum the same but sometimes a little lighter. Elytra medium to light brown, orangeish, scutellar area to shoulders darker, blackish. Legs, mouthparts and antennae slightly reddish medium brown. Body with moderate lustre in spite of light body colour, only elytra shinier. Pubescence medium dense and uniformly short (regularly spaced) on elytra, longer but finer on head and pronotum, only abdomen FIGS 64-70

(64-65) Apices of tergites VII and VIII; Ochthephilus aurorans (Peyerimhoff) , ♀ (64), O. scheerpeltzi (Fagel) , ♀ (65). (66-67) O. filum (Fauvel) ; headandpronotum (66), elytraand baseofabdomen (67). (68-70) O. angustatus (Erichson) ; headandpronotum (68), antenna (69), antennomeres 6-8 (70). All SEM, dorsal views. Scale bar = 0.12 mm for 64, 0.16 mm for 65, 0.2 for 70, 0.33 mmfor 66-67, 0.4 mmfor 68-69.

with conspicuous and longer setae; a few particularly strong and long setae near pronotal sides and inner anterior corners of eyes. Elytral apex without conspicuous setae. Last tarsomere with a few setae only.

Forebody. Antenna as in Fig. 69, antennomere 7 (and in lesser extent article 8) asymmetrically swollen (Fig. 70) on one side. Clypeus (Fig. 68) almost impunctate (colliculate microsculptured), trapezoid, corners rounded, anterior edge gently arched; separated by darker/impressed transversal line (frontoclypeal suture) across a shinier area. Supraantennal prominences well developed, feebly separated from clypeus/vertex by impressions. Vertex with oblique impressions in middle almost joining in V-shape. Temples bulging, almost evenly curved, little shorter than eye length. Neck separated by a shallowly impressed transversal groove, microsculpture much stronger than on head, with transverse cells, no setation. Pronotum with a narrow marginal bead, visible to anterior pronotal corners. Posterior pronotal angles well-formed, just slightly obtuse-angled, sides in posterior 2/3 almost straight. 'Anchor' partially formed, apart from longitudinal midline two roundish, elevated (shinier) areas near posterior margin and two similar ones on both sides of midline in anterior half of disc; basal arms barely visible. Elytra slightly broadening posteriorly, sutural corners narrowly rounded; apical sides slightly oblique and in inner half gently convex. Elytral surface rather even with two shallow, very elongate impressions behind scutellum. Head with fine coriaceous/colliculate microsculpture, fading on elevated parts, stronger in impressions, on pronotum microsculpture slightly stronger and more even. Punctation on head sparse, mostly confined to posterior part and sides, on pronotum more evenly spaced, average interspaces much larger than puncture diameters; elytral punctation more even and regularly spaced, average interspaces (with indistinct coriaceous microsculpture) about as puncture diameters, punctures discrete. Elytral apex without conspicuous setae.

Abdomen. Compared to forebody, abdomen with much more sparse, finer, less distinct punctation, microsculpture on tergal apices fine coriaceous with moderately transverse cells. Tergite VII posterior margin with palisade fringe unmodified in middle (nearly uniform breadth). Tergite VIII (Fig. 87) basal edge evenly arched, with small concavity in middle of basal sclerotized band; apical edge with sinuate (protruding) corners, and broad, moderately deep emargination in between. Sternite VIII with rounded apical corners, apex in males shallowly concave laterally, gently sinuate in middle; in females slightly more sinuate (convex) in middle. Tergite X unmodified, apex very slightly wider in males than in females. Aedeagus as in Fig. 54, inner sclerites as in Figs 55-56. Female ringstructures as in Figs 57-58.

COMPARATIVE NOTES: This species is somewhat similar to O. aurorans , (mostly by size and similar colouration) can be separated by the antennal features (much more elongate antennomeres in O. angustatus ) and the apex of tergite VIII peculiarly formed in O. aurorans .

DISTRIBUTION: The species is so far known from all around the Mediterranean

Basin and the southern parts of Central Europe.

BIONOMICS: Specimens were collected mostly from flood debris. It looks like this species inhabits only lowland rivers, so obviously is on the brink of extinction; most specimens are known from old samples, only a few recent records are known, FIGS 71-83

(71-73) Ochthephilusdavidi sp. n.; aedeagus (71), femaleringstructures (72-73). (74-78) O. emarginatus (Fauvel) ; aedeagus (74), innersclerites (75-76), femaleringstructures (77-78). (79-83) O. japonicus (Watanabe & Shibata) ; aedeagus (79), innersclerites (80-81), femaleringstructures (82-83). Scalebar = 0.04 mmfor 82-83, 0.05 mmfor 72-73, 77-78, 0.085 mmfor 71, 0.1 mmfor 74-76, 79-81.

O. Vorst collected it in 2008, M. Schülke in 1998, P. Wunderle in 2002 (all Italy). Much of what was written about O. scheerpeltzi could be repeated here, except that this species was once common, while O. scheerpeltzi was perhaps always rare and local.