Agnosthaetus bicolor Clarke, 2011

Clarke, Dave J., 2011, A Revision of the New Zealand Endemic Rove Beetle Genus Agnosthaetus Bernhauer (Coleoptera: Staphylinidae), The Coleopterists Bulletin (mo 10) 2011, pp. 1-118 : 42-43

publication ID	https://doi.org/ 10.1649/0010-065X-65.mo4.1
publication LSID	lsid:zoobank.org:pub:0818A3A2-AB42-43D8-8F76-4F65F367C584
DOI	https://doi.org/10.5281/zenodo.10315701
persistent identifier	https://treatment.plazi.org/id/8346B683-D2C7-4E5A-B6A8-E9AD5B9DDE8C
taxon LSID	lsid:zoobank.org:act:8346B683-D2C7-4E5A-B6A8-E9AD5B9DDE8C
treatment provided by	Carolina
scientific name	Agnosthaetus bicolor Clarke
status	sp. nov.

Treatment

(14) Agnosthaetus bicolor Clarke View in CoL , new species

( Figs. 118 View Figs , 130 View Figs , 134 View Figs , Map 4 View Map 4 )

Type Material. Holotype. ♂, with three labels: “[NN] Sunday Creek | Stanley Brook [41°18′37″S, 172°49′5″E]| 11-10-63, Litter| J.I. Townsend / FMNH-INS 0000 048 021 / HOLOTYPE Agnosthaetus bicolor Clarke , ♂, design. D. Clarke 2011”, in NZAC GoogleMaps . Paratypes. 30 specimens (15♂ 15♀). NEW ZEALAND: South Island: NN: Abel Tasman N.P., Harwoods Hole , 690 m, 40°56.712′, 172°53.367′, beech forest with no understory - completely open under canopy, 16.xii.2007, KM148, sifted leaf and woody litter, K. Marske & J. Allwood , 3♂, 1♀ (in NZAC) ; NN: Abel Tasman N.P., Canaan, Motueka (30 km NW), 800 m, 40°57′S, 172°53′E, Nothofagus forest, 22–28.v.1982, stump litter, S. & J. Peck GoogleMaps , 1♂, FMNH-INS 48227, 1♀, FMNH-INS 48228 (in FMNH) ; Canaan , 18.iv.1986, 66/137, litter, J.I. Townsend , 1♂, FMNH-INS 48198, 5♀, FMNH-INS 48199–203 (in NZAC) ; Canaan , 854 m, 4.xii.1964, 64/144, litter, G. Kuschel , 1♀, FMNH-INS 48205 (in NZAC) ; Canaan, Takaka Hill , 853 m (as 2800 ft), 41°2′S, 172°51′E, 27.ii.1967, 67/92, moss, J.I. Townsend GoogleMaps , 1♀, FMNH-INS 48496 (in NZAC) ; Nelson, Sandy Bay , 17.viii.1965, 65/424, moss, J.I. Townsend , 1♀, FMNH-INS 48506 (in NZAC) ; Nelson, Sandy Bay, Inland Rd. , 1676 m, 17.viii.1965, 65/419, moss, J.I. Townsend , 1♂ (in NZAC) ; Palmers Bush, Eve’ s V., Waimea West , 20.x.1971, 71/122, litter, G.W. Ramsay , 5♂, FMNH-INS 48219–220, FMNH-INS 48501–503, 1♀, FMNH-INS 48497 (in NZAC) ; Riwaka River Res., Motueka (20 km NW), 100 m, 41°2′3″S, 172°54′3″E [coord.=Riwaka Scenic Reserve ], mixed forest, 28.v.1982, FMHD#82-605; Peck #82-26, litter, S. & J. Peck GoogleMaps , 2♂, FMNH-INS 48225–226, 1♀ (in FMNH) ; Riwaka Valley , 28– 31.i.1949, A.E. Brookes Colln , 1♀, FMNH-INS 48250 (in NZAC) ; Takaka Hill , 610 m (as 2000 ft), 41°2′S, 172°52′E, 7.ii.1957, E.S. Gourlay GoogleMaps , 1♂, FMNH-INS 48020 (in NZAC) ; Takaka Hill , 762 m (as 2500 ft), 41°2′S, 172°51′E, 7.v.1957, E.S. Gourlay GoogleMaps , 1♂, FMNH-INS 48212 (in NZAC) ; Takaka Hills, Canaan Trk. , 975 m (as 3200 ft), 20.xii.1937, E.S. Gourlay , 1♀, FMNH-INS 48206 (in NZAC) ; Tasman N.P., Takaka (20 km NE), 40°54′36″S, 172°57′58″E [coord.= Abel Tasman National Park], mixed forest, 21.v.1982, FMHD#82-591, litter, S. Peck GoogleMaps , 3♂, FMNH-INS 48213–215, 2♀, FMNH-INS 48216–217 (in FMNH) .

Diagnosis. Agnosthaetus bicolor may be reliably distinguished from all other species of Agnosthaetus , except A. brouni , A. tumidus , and A. zonatus , by the same combination of characters given for A. brouni (see Diagnosis for that species, p. 35). From A. brouni , A. tumidus , and A. zonatus , the aedeagus of A. bicolor may be distinguished by the combination of apical part of median lobe with subparallel ridges near base ( Fig. 134 View Figs , arrow, cf. Fig. 125 View Figs , arrow), paramere in dorsal view nearly straight-sided before apex, with apical part concave mesially ( Fig. 130 View Figs , arrow), and more elongate than in A. brouni (cf. Fig. 121 View Figs , arrow), and basal sclerite of internal sac broadly U-shaped with arms subparallel ( Fig. 197 View Figs , arrow, cf. Fig. 195 View Figs , arrow).

Description. Color: Variable, yellowish to reddish brown, frequently with darker elytra and abdominal segments. Head: Frontal ridge present (cf. Fig. 12 View Figs , fr). Dorsum moderately densely punctate; with punctures distributed evenly over surface, but occasionally absent from middle part. Punctures variable, ranging from deep and more or less well-defined to shallow and indistinct; diameter variable, ranging from less than to slightly greater than diameter of eye facet; interpuncture distance inconsistent, punctures irregularly disposed, 0.5 –>1.0X puncture diameter. Dorsal microsculpture absent. Dorsal tentorial sulcus (cf. Figs. 10–11 View Figs , dt) distinctly slit-like; width subequal to or less than puncture diameter. Sublongitudinal ridge (cf. Fig. 10 View Figs , sr) distinct; not confused by smaller carinae or punctures; crest at antennal tubercle without distinct microsculpture. Area above and behind antenno-ocular carina ( Figs. 10–11 View Figs , arrow) more or less smooth, without subsidiary carinae, or with single subsidiary carina formed by confluent punctures. Antenno-ocular carina joining eye at or behind middle (cf. Fig. 12 View Figs , ao). Temple ( Fig. 11 View Figs , tm) short, less than 50% EYL. Subocular surface with narrow well-demarcated band of microsculpture (cf. Fig. 63 View Figs , bm). Labrum distinctly sexually dimorphic ( Fig. 118 View Figs ). Apical labral margin in males strongly emarginate medially, evenly dentate, with 21–24 teeth (n =10), all teeth normal, projecting more or less anteriorly. Apical labral margin in females broadly convex, not emarginate medially; with 18–29 teeth (n =9), medial tooth elongate, twice length of others. Adoral labral surface in males smooth, without subapical transverse ridge. Mandible more or less identical in both sexes; males and females with single, mesially directed tooth, males with weakly developed preapical spur (cf. Fig. 190 View Figs , arrow); females without spur. Prothorax: Pronotum without microsculpture. Medial pronotal sulci anteriorly separate from and terminating posterior to anterior punctures (cf. Fig. 78 View Figs ). Distance between medial sulci slightly greater posteriorly. Pronotal basolateral carina absent (cf. Fig. 78 View Figs ). Anterior pronotal puncture (cf. Fig. 70 View Figs , ap) absent or indistinct; medial puncture (cf. Fig. 70 View Figs , mu) distinct; basal puncture ( Fig. 70 View Figs , bu) absent. Medial pronotal seta subequidistant from medial and lateral sulci (cf. Fig. 78 View Figs ). Pronotal hypomeron ( Fig. 24 View Figs , hy) shiny, without microsculpture. Prosternum without microsculpture. Pterothorax: Elytron ( Fig. 23 View Figs , e) without microsculpture; with 2 macrosetae, not set in punctures; laterally with single ridge (cf. Fig. 24 View Figs , ek). Mesothoracic epimeral region ( Fig. 24 View Figs , mer) shiny, without microsculpture. Metathoracic pleural region ( Fig. 24 View Figs , m) shiny, without microsculpture. Metathoracic pleural ridge absent; metathoracic pleural groove ( Fig. 24 View Figs , gr) complete, continuing to or near to pleurocoxal articulation. Abdomen: Abdominal vestiture long and short, somewhat appressed, dorsally with radiating fans of setae either side of midline and laterally, or more or less evenly projecting posteriorly but with middle setae directed posteromedially. Abdominal sternite V of male with large, diffuse patch of coarser setae medially. Aedeagus ( Fig. 130 View Figs ): “ Type A” (see description on p. 8). Apical part of median lobe distinctly trilobate, with rounded lateral lobes and abruptly distinct, broadly acuminate, and sharply pointed apicomedian lobe; apical part of median lobe and with subparallel ridges at base ( Fig. 134 View Figs , arrow). Both apicolateral and apicomedial setae short ( Fig. 134 View Figs ). Paramere exceeding apex of median lobe; lamellate, in lateral view distinctly broad along most of length; with apical part curving ventrally; in dorsal view with outer side gently convex (to nearly straight before apex); with 4 large setae at apex; internal sac as in Figs. 197 View Figs , 200 View Figs .

Etymology. The name bicolor is a noun in apposition, taken from the Latin bi- (two), and color (color), in reference to the distinct reddish brown color of this species, together with the darkly pigmented fourth abdominal segment.

Distribution. ( Map 4 View Map 4 ). South Island: NN.

Biology and Ecology. Habitat: Nothofagus and mixed forest. Specimens have been taken from leaf litter and bryophytes. Phenology: year-round. Elevation: 100–1,676 m.

Remarks. This species is externally indistinguishable from A. brouni (although it exhibits greater color variability than that species), and the median lobe and parameres exhibit only subtle differences, too. The head, pronotum, and elytra are frequently darkly pigmented to nearly black, in addition to more than the regular fourth abdominal segment. However, the internal sac structures of this species ( Figs. 197 View Figs , 200 View Figs ) confirm these specimens as belonging to a separate species. (Note: no specimen of A. brouni had the internal sac everted sufficiently to photograph, but partial eversions demonstrated distinct differences in the structure of the lamellate sclerites from those shown in Fig. 200 View Figs , arrow).