Ceramphis deformata (Horn)

Jałoszyński, Paweł, 2021, The enigmatic Nearctic genus Ceramphis Casey revisited (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 5005 (1), pp. 77-84 : 79-83

Ceramphis deformata (Horn)

( Figs 1–14 )

Scydmaenus deformatus Horn, 1885: 138 .

Ceramphis deformata (Horn) ; Casey, 1897: 539.

Type material. Lectotype (designated by O’Keefe (1997)): USA (California): ♀, six labels: “Cal.” [white, print- ed], “S. / deformatus / Horn” [white, handwritten], “ Ceramphis / det W.Suter ‘77” [white with black margins, hand- written], “ LectoTYPE / 3029” [red, printed and handwritten], “ Lectotype ♀ / CERAMPHIS / DEFORMATA / Horn / S. O’Keefe Des. ” [red, handwritten], “ MCZ TYPE / 34844 ” [red, handwritten] ( MCZ) . Paralectotypes (3 exx.): ♂, three labels: “HornColl / H 1848” [white, printed and handwritten], “ MCZ Type / 34844” [red, handwritten], “ Ceramphis / deformatus H. / det. H.Franz ” [white, handwritten and printed] ; ♀, three labels: “ Cal ” [white, printed], Para-Type / 3029” [bluish, printed and handwritten], “ Ceramphis / deformatus Horn / det. H.Franz ” [white, hand- written and printed] ; 1 ex. of unknown sex (partly disarticulated), three labels: “Cal” [white, printed], “HornColl / H 1848” [white, printed and handwritten], “ MCZ Type / 34844” [red, handwritten] (all paralectotypes in MCZ) .

Diagnosis. As for genus; vide supra.

Description. Body of male ( Fig. 1 ) stout, strongly convex, uniformly dark brown; setae distinctly lighter than cuticle; BL 1.75 mm.

Head broadest at large, moderately strongly convex and finely faceted eyes, HL 0.30 mm, HW 0.40 mm; ver- tex in anterior view ( Fig. 2 ) angulate at middle, in lateral view ( Fig. 6 ) with the highest site distant from occiput; tempora in dorsal view ( Fig. 4 ) longer than eyes, weakly convergent posterad, just in front of occipital constriction rapidly and strongly bent mesad; occipital constriction about as broad as half width of head, sharply marked; frons in dorsal view ( Fig. 4 ) subtrapezoidal with shallowly emarginate anterior margin, in anterior view ( Fig. 2 ) region between antennal fossae subtriangular and prolonged anteriorly by narrow median carina; antennal fossae separated at middle by distance subequal to width of scape; anterior tentorial pits ( Fig. 2 ; atp) conspicuously large and situated anterad antennal fossae; clypeus ( Fig. 2 ; cl) conspicuously long, medially weakly convex, with anterior margin weakly emarginate; frontoclypeal groove lacking. Clypeus, frons and vertex virtually impunctate, sparsely covered with short suberect setae, posterior regions of tempora with sparse groups of numerous long, curved and suberect setae directed posterad. Genae and postgenae impunctate, genae with two lateral groups of dense and long postgenal setae ( Fig. 5 ; pgs) directed laterad and slightly posterad; posterior tentorial pits ( Fig. 5 ; ptp) small and nearly circular, situated just on anterior margin of deep transverse impression demarcating ‘neck’ region ventrally; anterior gular and submental region laterally not demarcated, flattened; hypostomal ridges ( Fig. 5 ; hr) vestigial, marked only just behind cardines. Anterior margin of submentum ( Fig. 5 ; smn) evenly emarginate, so that anterolateral corners of submentum forming subtriangular lobes projecting anterad; mentum ( Fig. 5 ; mn) subtrapezoidal, broadest near base; prementum largely membranous, short, labium lacking differentiated ligula, with broadly separated bases of labial palps; labial palpomere 1 slightly elongate, slightly broadening distad; palpomere 2 twice as long as broad, in- distinctly broadening distad; palpomere 3 nearly as long as 2 but much narrower, rod-like, weakly narrowing distad to rounded apex and indistinctly curved; each mandible ( Fig. 7 ) with broad and flattened basal region and slender, curved and sharp apical tooth, prostheca large, occupying entire mesal margin of basal region, left mandible with one sharp mesal pre-apical tooth ( Fig. 7 ; pat), right mandible with two pre-apical teeth forming one bifid projection; labrum ( Fig. 7 ; lbr) strongly transverse with rounded sides and broadly, shallowly emarginate anterior margin, dorsal setae arranged in three transverse rows, of which anterior and posterior rows comprise even number of setae, and median row has additional unpaired median seta. Antennae ( Figs 1, 3 ) slender, with indistinctly delimited trimerous club composed of elongate antennomeres covered with denser setae than remaining antennomeres, AnL 1.10 mm; scape ( Fig. 2 ) 2.5× as long as broad, slightly broadening distad and with dorsal and ventral notch, so that antennae can bend lateroposterad; pedicel distinctly shorter than scape, slightly broadening distad; antennomere 3 ( Fig. 3; a3 ) slightly shorter than pedicel; antennomere 4 ( Fig. 3 ; a 4 ) about as long as broad; antennomere 5 ( Fig. 3 ; a 5 ) strongly enlarged and asymmetrical, much longer than 4 and 6, with subtriangular lateral expansion; antennomere 6 ( Fig. 3 ; a 6 ) slightly asymmetrical, indistinctly elongate; antennomere 7 ( Fig. 3 ; a 7 ) indistinctly asymmetrical and as long as broad; antennomere 8 ( Fig. 3 ; a 8 ) symmetrical and slightly transverse; antennomere 9 ~1.5× as long as broad, slightly broadening distad, antennomere 10 much broader and slightly longer than 9, ~1.5× as long as broad and slightly broadening distad; antennomere 11 indistinctly longer and broader than 10, ~1.6× as long as broad.

Tentorium (not shown; studied in semi-transparent temporary mount in glycerol) with dorsal tentorial arms fused with dorsal wall of head.

Pronotum ( Figs 1 , 4 ) subtrapezoidal, broadest at base and strongly narrowing anterad; PL 0.50 mm, PW 0.48 mm; anterior margin much narrower than head, distinctly emarginate; anterior corners rounded, obtuse-angled; sides nearly straight; posterior corners sharp-angled; posterior margin distinctly bisinuate; pronotal base lacking pits, with very shallow and indistinct transverse impression adjacent to posterior margin. Pronotal disc virtually impunctate and sparsely setose, setae short and erect, anterolateral groups of long setae much denser than those on remaining dorsal and lateral surface, directed laterad and curved posterad. Hypomera ( Fig. 5 ; hy) large and smooth, nearly entirely asetose except for two lateral groups of dense and long setae inserted anterad procoxal cavities. Basisternal region of prosternum ( Fig. 5 ; bst) only slightly shorter than coxal region, smooth and asetose, laterally fused with hypomera except for short anterior region separated by deep lateral notch, which is the only trace of notosternal suture ( Fig. 5 ; nss). Hypomeral ridges lacking; procoxal cavities ( Fig. 5 ; pcc) broadly open, but posterolaterally partly delimited by subtriangular mesal lobe of hypomeron. Prosternal process developed as weakly elevated and very narrow median carina, in undissected specimens hidden between procoxae. Profurcal foveae ( Fig. 5 ; pff) small, situated mesad procoxal cavities.

Mesoventrite with massive prepectus ( Fig. 8 : pr) forming collar inserted into prothorax; anteromedian impres- sions functioning as procoxal rests ( Fig. 8 ; pcr) large, deep and asetose, demarcated by diffuse ridges and with weakly elevated median longitudinal ridge; mesoventral intercoxal process ( Fig. 8 ; msvp) remarkably narrow, carinate and weakly elevated, posteriorly fused with metaventrite; mesocoxal cavities remote from lateral margins of mesoventrite; mesofurcal foveae ( Fig. 8 ; msff) small but distinct.

Metaventrite subrectangular, transverse; mesocoxal rests posteriorly and laterally demarcated by postmesocox- al carinae ( Fig. 8 ; pmcc); metaventral intercoxal process ( Fig. 8 ; mtvp) short and about as broad as metacoxa, with emarginate posterior margin, so that posterolateral corners form subtriangular lobes projecting posterad. Metanepisterna ( Fig. 8 ; aest3) exposed and fused with metaventrite on entire length, so that metacoxae are distant from elytra.

Elytra together somewhat rhomboidal, conspicuously short and broad, broadest distinctly in front of middle, with base much broader than posterior pronotal margin; EL 0.95 mm, EW 0.88 mm, EI 1.09; humeral calli distinct; basal margin of each elytron concave near middle and lacking basal foveae Punctures on elytra indistinct; setae sparse, moderately long, erect.

Hind wings long and functional in both sexes.

Legs long; pro- and mesocoxae ovoid, metacoxae transverse and flat, with proximal regions asetose and short posterior articulating projections densely covered with setae; pro- and mesotrochanters short, subtriangular, metatro- chanters strongly elongate, ~2.5 as long as broad, slightly broadening distad, all trochantero-femoral articulations strongly oblique; all femora weakly, gradually clavate; all tibiae straight or nearly so, slightly and gradually broad- ening distad; tarsi subcylindrical, pentamerous, in males not broadened and lacking spatulate setae.

Abdomen with six exposed sternites ( Fig. 8; a3–8 ), sternites 3 and 8 the longest, each as long as or slightly longer than median length of sternites 4–7. Pygidium subvertical; propygidium sclerotized and with elytral locking device composed of median groove ( Fig. 9 ; mg) flanked by elongate trichial fields ( Fig. 9 ; tf).

Aedeagus ( Figs 10–13 ) strongly elongate; AeL 0.38 mm; median lobe with ostium situated dorsally; broad para- meres fused with median lobe and their distal portions fused together and forming ventral aedeagal wall and apex; endophallus with elongate tubular structures; endophallic retractor attached to diaphragm situated sub-basally and lacking lentiform sclerotization.

Spermatheca globular (illustrated by O’Keefe (1997), figs 9a, c).

Figures

FIGURES 1–3. Ceramphis deformata, male paralectotype. Dorsal habitus (1); head in anterior view (2); left antennomeres 2–8 in dorsal view (3). Abbreviations: atp, anterior tentorial pit; a3–8; antennomere 3–8; cl, clypeus; fr, frons.

FIGURES 4–6. Ceramphis deformata, male paralectotype. Head, pronotum and elytral base in dorsal view (4); head and prot- horax in ventral view (5); head and prothorax in lateral view (6). Abbreviations: bst, basisternal region of prosyternum; hr, hy- pomeral ridge; hy, hypomeron; mn, mentum; nss, motosternal suture; pcc, procoxal cavity; pff, profurcal fovea; pgs, postgenal setae; smn, submentum.

FIGURES 7–14. Ceramphis deformata, male paralectotype (7–13) and female lectotype (14). Mouthparts in anterior view (7); pterothorax and abdomen in ventral view (8); elytral apex and propygidium in dorsal view (9); aedeagus in dorsal (10, 12) and lateral (11, 13) views; labels of lectotype (14). Abbreviations: aest3, metanepisternum; cl, clypeus; lbr, labrum; mg, median groove; msff, mesofurcal fovea; msvp, mesoventral process; mtvp, metaventral proces; pat, pre-apical tooth; pcr, procoxal rest; pm, paramere; pmcc, postmesocoxal carina; pr, prepectus; pst, prostheca; s3–8, sternites 3–8; tf, trichial field.