Psalidognathus antonkozlovi, Noguchi & Santos-Silva, 2016

Noguchi, Taketsune & Santos-Silva, Antonio, 2016, A new species of Psalidognathus Gray, 1831 from Peru (Coleoptera: Cerambycidae: Prioninae), Insecta Mundi 2016 (508), pp. 1-6 : 1-4

Psalidognathus antonkozlovi sp. nov.

( Fig. 1–7 )

Male. Integument dark brown, blackish on head, mandibles, scape, prothorax, and scutellum; mouthparts light reddish brown; pedicel dark brown; antennomere III dark brown with distal area gradually reddish brown; antennomeres IV–XI reddish brown (gradually lighter toward distal segments); elytra blackish on base, gradually reddish brown toward apex; dorsal side of basal quarter of profemora dark brown, gradually reddish brown toward apex; ventral margins of meso- and metafemora black, with remaining surface dark reddish brown (darker toward apex); protibiae dark brown on basal third, gradually reddish brown toward apex; meso- and metatibiae reddish brown except dark brown base; tibial spurs black; tarsi reddish brown except small darkened area on center of dorsal surface of tarsomeres I and II, and entire apex of tarsomere V; claws mostly dark brown with some reddish regions.

Head. Frons finely rugopunctate except transverse, smooth, narrow area close to clypeus (centrally triangularly projected upward); with moderately long, sparse, erect, yellowish setae. Vertex coarsely, rugopunctate, smoother on narrow area close to upper eye lobes; with moderately long, erect, yellowish setae, more abundant laterally; cephalic carinae rugopunctate starting at level of posterior ocular margin, slightly divergent toward its apex, gradually elevated toward subconical, slightly elevated apex placed at about middle of area between eyes and prothorax; area between antennal tubercles and cephalic carinae slightly longitudinally depressed. Tempora with large, conical tubercle placed at about level of middle of lower eye lobes; area behind upper eye lobes with sculpture as on vertex, with moderately long and sparse yellowish setae; area between tubercle and eye with small granules and moderately long, sparse yellowish setae; area behind lower eye lobes finely transversely rugose close to eye, with abundant minute granules on remaining surface, moderately long, sparse yellowish setae in rugose area, and abundant short yellowish setae on remaining surface (not obscuring integument). Genae coarsely, confluently punctate toward ventral side, nearly smooth centrally, finely, confluently punctate toward antennal socket (except narrow, smooth area close to eye); apex projected, somewhat flattened dorsoventrally, slightly curved laterally; with long, sparse yellowish setae toward ventral side, glabrous in smooth region, with row of moderately long and closely spaced yellowish setae in finely punctate region; glabrous on apex. Antennal tubercles coarsely, confluently punctate on base, gradually finer toward smooth apex; with minute, sparse yellowish setae. Longitudinal sulcus distinct from clypeus to prothoracic margin. Clypeus subhorizontal in basal half (somewhat concave, with anterior margin slightly elevated), distinctly vertical at center of distal half, inclined at sides of distal half; finely, abundantly punctate in basal half and sides of distal half, smooth in center of distal half; with short, sparse yellowish setae in punctate regions. Labrum distinctly concave, nearly smooth, with anterior margin widely emarginate; with moderately long, sparse yellowish setae laterally, and abundant long yellowish setae close to apex. Gulamentum nearly smooth between metatentorial pits, moderately finely rugopunctate toward mentum (more transversely carinate near anterior margin); central area slightly depressed close to elevated anterior margin; with abundant long, erect yellowish setae (mainly laterally on anterior area), not obscuring integument. Mandibles curved downward; in lateral view distinctly widened at base, gradually flattened toward apex; in dorsal view wide, inclined toward inner margin; inner margin multidentate from base to distal tooth; distal tooth of left mandible forming part of distal inner plate, that of right mandible not forming part of distal plate; moderately finely, densely punctate (mainly in basal third) except in smooth band along ventral and dorsal inner margins (widened toward apex, mainly ventrally); with short, sparse yellowish setae, mainly laterally in basal third. Labial palpomere I 0.35 times as long as II; III 0.9 times as long as II. Maxillary palpomere I 0.4 times as long as II; III 0.7 times as long as II; IV 1.1 times as long as II. Distance between upper eye lobes 0.8 times length of scape; distance between lower eye lobes in ventral view 2.1 times length of scape. Antennae 1.3 times as long as elytra, almost reaching elytral apex; scape moderately finely, abundantly punctate on base of dorsal and lateral surfaces, gradually sparser toward apex; antennomere III subcylindrical in basal half, gradually flattened in distal third of ventral side, with sensorial area occupying most of this area; antennomeres IV–V dorsally convex; antennomeres IV–X ventrally depressed, entirely occupied by sensorial area; ventral sensorial area of antennomeres VII–XI longitudinally divided by central carina (more elevated after IX); outer side of antennomere IV with narrow, elongated sensorial area occupying distal third; outer side of antennomere V with narrow, elongated sensorial area in basal quarter and another occupying distal half; outer and inner sides of antennomere VI with sensorial area occupying entire surface (narrowly divided at middle of inner side); outer and inner sides of antennomere VII with sensorial area occupying entire surface, and dorsal surface with sensorial area in distal half; antennomeres VIII–XI with sensorial area occupying ventral, dorsal and lateral sides; apex of antennomeres unarmed; antennal formula (ratio) based on antennomere III: scape = 0.45; pedicel = 0.07; IV = 0.62; V = 0.56; VI = 0.51; VII = 0.51; VIII = 0.47; IX = 0.44; X = 0.39; XI = 0.51.

Thorax. Anterolateral angles of pronotum projected forward, with large, flattened, triangular tooth fused with another flattened, triangular tooth placed at basal third; basal third with long conical tooth; posterolateral angles with small rounded projection; disc with three large gibbosities, one circular on each side and one central in basal half followed by narrow carina reaching front margin; area between gibbosities and anterior quarter distinctly depressed; anterior and posterior margins sinuate; surface coarsely, densely rugopunctate, with abundant long, erect yellowish-brown setae throughout. Prosternum moderately finely, abundantly striate-punctate, with abundant long, erect yellowish-brown setae. Prosternal process with three longitudinal sulci, one on each side and one central, with abundant long, erect yellowish-brown setae (mainly near apex). Metepisternum and metasternum minutely, densely punctate, with abundant short, decumbent yellowish-brown setae. Scutellum finely, moderately sparsely punctate, with sparse short, decumbent yellowish-brown setae.

Elytra. Distinctly tapering toward apex; coarsely rugopunctate throughout; epipleura explanate in basal half; humerus slightly projected, but not spiny; apex rounded at outer side, with small projection at sutural angle.

Legs. Profemora densely, coarsely granulose on sides (granules forming small spines on inferior side of margins); ventral surface depressed. Mesofemora finely, sparsely punctate, with sparse small spines at inferior margins of sides. Metafemora very finely, densely transversely striate. Protibia in dorsal view gradually enlarged in proximal third, slightly gradually narrowed at inferior margin to about midlength, then slightly gradually enlarged at inferior margin to base of distal sixth, then gradually distinctly enlarged toward apex; ventral sulcus present from base to apex, gradually enlarged from base to apex of proximal third, but not distinctly densely setose in proximal third; in dorsal view moderately coarsely, abundantly punctate, gradually sparser toward apex, mainly in distal sixth; in ventral view with abundant small spines. Ventral side of mesotibia with ventral sulcus similar to that of protibia, but narrower, distinctly setose in distal half; sculpture similar to that of protibia, but short spines less abundant. Metatibia without ventral sulcus; short spines sparser, shorter than on mesotibiae. Apex of lobes of meso- and metatarsomere V spiny (mainly on metatarsomere).

Abdomen. Ventrites I–IV moderately coarsely, abundantly punctate (mainly on ventrite I) except smooth distal region (widened centrally); ventrite I with moderately abundant long, decumbent yellowishbrown setae in punctate region; ventrites II–IV with sparse long, decumbent yellowish-brown setae, more abundant laterally and along area close to smooth region. Ventrite V finely, moderately sparsely punctate in basal half, abundantly coarsely punctate in distal half; distal margin widely emarginate; basal half with sparse moderately short, suberect yellowish-brown setae; distal half with abundant long, suberect yellowish-brown setae.

Variation in Male. Blackish area of elytra distinctly surpassing basal third; dorsal sides of meso- and metafemora dark brown; longitudinal depression on vertex moderately deep; apex of cephalic carinae plate-shaped; antennae from almost reaching elytral apex to distinctly surpassing it by the last antennomere.

Female. Dorsal surface of head almost glabrous; cephalic carinae similar to those in male. Mandibles similar to that in male, proportionally shorter. Antennae as long as 1.2 times elytral length, almost reaching elytral distal fifth. Scape slender, longer than in male. Prothorax very similar to that in male, but almost glabrous. Elytra distinctly widened centrally, distinctly more vermiculate than in male, mainly in basal half. Metepisterna glabrous. Metasternum shorter than in male; minutely, moderately abundantly punctate laterally, interspersed with fine punctures, smooth centrally; glabrous. Abdominal ventrites minutely, sparsely punctate, interspersed with fine (mainly on ventrite V), sparse punctures; apex of ventrite V sub-rounded. Protibia gradually enlarged from base to apex, more distinctly in distal sixth.

Dimensions (holotype male/ paratype males/ paratype females). Total length (including mandibles) 74.0/44.5–63.0/44.3–53.2; length of prothorax centrally 7.7/4.5–6.5/5.3–7.1; width of prothorax between apices of anterior angles 19.9/11.1–17.5/13.8–16.5; width of prothorax between apices of posterior angles 14.5/8.0–13.0/9.2–11.1; humeral width 23.2/14.3–18.4/14.3–17.9; elytral length 45.2/29.2–37.6/28.3–33.5.

Etymology. The new species is named after Anton Olegovich Kozlov, who first recognized the species as new.

Type Material. Holotype male from PERU, Piura: Pampa Minas (Canchaque, Huancabamba; 1800- 2000 m), I.2016, V. L. Guerrero col. ( MZSP) . Paratypes – 130 males, 9 females, same data as holotype (1 female, MZSP; 130 males, 8 females, TNPC) ; Piura region, 1 male, III.2016, local collector ( NDPC) ; Canchaque ( Huancabamba ; 2000 m), 4 males, II.2016, local collector ( EGLR) ; 11 males, 1 female, II.2016, local collector ( AKPC) .

Comparison. Psalidognathus antonkozlovi sp. nov. is similar to P. erythrocerus Reiche, 1840 in general appearance and shape of cephalic carinae, but differs as follows: male scape less coarsely punctate; male pronotum setose; humerus not spiny (both sexes); center of scutellum not rugose (both sexes); male protibia not distinctly sulcate and setose in proximal third. In P. erythrocerus , the male scape in coarser punctate, the male pronotum is not setose, the humerus is distinctly spiny in both sexes, the central area of the scutellum is rugose in both sexes, and the male protibiae is distinctly sulcate and setose from base to apex. The new species can be separated from P. cerberus Santos-Silva and Komiya, 2012 by the male scape less coarsely punctate, the male pronotum distinctly setose (not so in P. cerberus ), the humerus of either sex is not spiny, and the inferior side of male protibia widened only in proximal third (widened throughout length in male of P. cerberus ). The new species differs from P. reichei Quentin and Villiers, 1983 mainly in having the cephalic carinae slightly divergent toward apex and not ending in a conical projection in both sexes (notably divergent toward apex and ending in a conical projection in both sexes of P. reichei ), by the mandibles of large males notably different more flattened, wider centrally, and not curved laterally (in large males of P. reichei they are less flattened, narrower centrally, and notably curved laterally), by the distance between upper eye lobes shorter than length of scape in male (larger than length of scape in male of P. reichei ), and by the female antennae notably surpassing midlength of elytra (slightly surpassing in female of P. reichei ). Finally, P. pubescens Quentin and Villiers, 1983 differs in having the mandibles of large males notably rounded laterally and not flattened, the cephalic carinae of both sexes distinctly divergent and ending in a conical projection, the female antenna only slightly surpassing midlength of elytra, and the lateral teeth of male pronotum shorter.

For comparisons, photographs of the types of P. erythrocerus , P. pubescens , P. cerberus , and P. reichei are available in Santos-Silva and Komiya (2012), Bezark (2016), and Pirkl (2016).

The new species belongs to the “modestus” species group and can be included in the alternative couplets “2” of Santos-Silva and Komiya (2012):

2’(1). – Ventral sulcus of protibia wide and very distinctly setose from near base ............................... 3 Ventral sulcus of protibia not wide and not distinctly setose in proximal third ....................... 2 2(2’).

–

Pronotum of male distinctly setose; humerus of either sex not spiny; inferior side of male protibia (dorsal view) widened only in proximal third. Peru...................... P. antonkozlovi sp. nov.

Pronotum of male with short and sparse setae; humerus spiny in both sexes; inferior side of male protibia (dorsal view) widened throughout length. Colombia.......................................... ........................................................................ P. cerberus Santos-Silva and Komiya, 2012

Figures

Figure 1–7. Psalidognathus antonkozlovi sp. nov., holotype male (1–5), paratype female (6–7). 1) Dorsal habitus. 2) Ventral habitus. 3) Protibia. 4) Pronotum. 5) Humerus. 6) Dorsal habitus. 7) Ventral habitus.