Euspilotus (Platysaprinus) latimanus ( Schmidt, 1890 )

Lackner, Tomáš & Arriagada, Gerardo, 2020, Revision of Euspilotus, subgenus Platysaprinus, with description of two new species (Coleoptera: Histeridae), Acta Entomologica Musei Nationalis Pragae 60 (1), pp. 303-317 : 305-309

Euspilotus (Platysaprinus) latimanus ( Schmidt, 1890)

( Figs 1–22 , 56 )

Saprinus latimanus Schmidt, 1890:50 (original description).BLACKWELDER (1944): 179 (catalogue).

Platysaprinus latimanus: BI CKHARDT (1916): 106, table 5, Fig.36 (catalogue); BLA CKWELDER (1944): 180 (catalogue).

Euspilotus (Platysaprinus) latimanus : MAZUR (1984): 72 (catalogue); MAZUR (1997): 239 (catalogue); MAZUR (2011): 193 (catalogue).

Type locality. Triginal type locality ‘Brasilia (Matto grosso)’ specified here by lectotype designation to: Brazil: Mato Grosso: Rio Madeira.

Type material examined. L ECToTYPE (present designation):, originally pinned, glued onto a rectangular mounting card, right mid-leg broken off, glued to the mounting card next to the specimen, genitalia extracted and placed into a small vial under the specimen, ‘Matto Grosso | Rio Madeira [written] || Type [brick-red, printed label] || SoNToPffS | Saprinus | latimanus Schmidt, 1890 | labeled by MNHUB 2004 [red label, printed] || Lectotypus | Euspilotus | ( Platysaprinus ) | latimanus (Schm.) | Det. G. Arriagada 2004 [printed-written]’ ( MFNB). PARAL ECToTYPEs: ♀, pinned, ‘ Brazil | Natterer [written] || latimanus | Type Schm. [written] || Type [brick-red, printed label] || coll. J. Schmidt [printed] || Platysaprinus | latimanus | Schm. [written] || SoNToPffS | Saprinus | latimanus Schmidt, 1890 | labeled by MNHUB 2004 [red label, printed] || Paralectotypus ♀ | Euspilotus | ( Platysaprinus ) | latimanus (Schm.) | Det.G.Arriagada 2004 [printed-written]’ ( MFNB); ♀, originally pinned, glued on the rectangular mounting card, most legs either entirely or partly missing, ‘Matto Grosso | Rio Madeira [written] || Type [brick-red, printed label] || SoNToPffS | Saprinus | latimanus Schmidt, 1890 | labelled by MNHUB 2004 [red label, printed] || Paralectotypus ♀ | Euspilotus | ( Platysaprinus ) | latimanus (Schm.) | Det. G. Arriagada 2004 [printed-written]’ ( MFNB).

Additional material examined: BRAZIL: FEDERAL DI STRICT: Brasilia, xii.1987, 1, 2 spec., F.Vaz de Mello lgt., FIT ( CND); Brasilia, 15°47′S, 47°55′W, x.1999, 1 spec (at light), N.Dégallier lgt.( CSCA). SÃO PAULO: São Paulo, 6 2 ♀♀, Mráz lgt. ( NMPC, 3 in MSNG); São Paulo, opiranga, 10.iii.[18]84, 1, collector unknown ( MFNB). MATO GRO SO SO: Municipalidade Cuiabá, Fazenda Mutuca, 15.3145°S, 55.9703°W, 30.xii.2008, 1 spec. (flight intercept trap), F.H. Gava & J.R. Rocha lgt. ( CSCA); Municipalidade Diamantino, Vale de Solidão, 14°21.63′S 56°6.4′W, 22.xii.2008 – 26.i.2009, 2 spec. (flight intercept trap), D.C.T. Tliveira lgt. ( CSCA); Chapada dos Parecis, Campos de Julio, 30 km N of Ville abandonee d’Uirapuru, Usine Alcomat, 14º16′4″S, 54º14′1″W, 1.–15.xii.2000, 2 ♀♀, A. Foucart lgt. ( CND); Chapada dos Parecis, 14º15′50.80″S, 59º14′02.05″W, 1 spec. ( CND); Tangará da Serra, Faz. Aparecida da Serra, 14º21′16″S, 57º44′00″W, 562 m, cerrado, 3.ii.2010, 3, 1 spec. ( FIT), R.J. Silva lgt. ( CVMD). MINA S GERAI S: Jaboricatu Bes, x.1951, 1 spec., Perreira lgt. (coll. Thérond, MNHN); Parc Natural da Serra do Cipó, 5.x.2004, 2 spec., 5.xii.2004, 1 ( CVMD). UNKNOWN STATE: IBGE-JANELA/Q, 7.xi.1987, 1, 1 spec., ZTT 23 ( CND). PARAGUAY:AMAMBA Y: P. N.Cerro Corá, 1.–6.ii. 2006, 280 m, 22º38′S 56º01′W, R. Barrera lgt. ( CVMD). ARGENTINA: MI SIONES: depto. Concepción, Santa María, xii.1958, 4 2 ♀♀, M. Viana lgt. (1 ♀ CTLA; rest of specimens CVMD). BOLIVIA: ‘Mojos’ [I H Moxos], 1 spec., N. Holmgren lgt. ( NRMS).

Redescription. Body ( Figs 1–2 ). PEL: 3.55–5.50 mm; APW: 1.35–2.20 mm; PPW: 3.30–4.20 mm; EW: 3.65– 4.70 mm; EL: 2.55–3.20 mm; broadly oval, slightly depressed dorsally; cuticle dark-brown to black; appendages reddish-brown.

Head. Frons densely punctate, punctures regular, separated by about their own to twice their diameter. Frontal disc ( Fig. 3 ) approximately as broad as long, slightly depressed medio-anteriorly; occipital stria very thin; supra-orbital stria slightly carinate, for short distance prolonged onto punctate and weakly depressed epistoma. Labrum ( Fig. 5 ) with labral pits and setae; mentum ( Fig. 4 ) sub-trapezoid, lateral sides with row of prominent setae; anterior margin with deep notch; lacinial ‘hook’ (I uncus) present. Mandibles ( Fig. 6 ) dorsally with scattered punctation, punctures becoming larger, shallow and confluent laterally; sub-apical tooth on left mandible absent; mandibular apices pointed.Antennal scape ( Fig. 3 ) thickened, dorsally punctate, on lower third adorned with characteristic single long seta, with single shorter seta dorsally; antennal club ( Fig. 7 ) depressed, densely covered with sensilla sparsely intermingled with erect longer setae; sensory structures of the antennal club ( Fig. 7 ) ventrally with single round sensory area concealing two ball-like vesicles beneath. Eyes large, well visible from above.

Pronotum. Pronotal sides ( Fig. 1 ) narrowing anteriorly; lateral pronotal stria complete, weakened behind head, costate laterally, not reaching basal pronotal angles, slightly distanced from lateral pronotal margin on basal tenth. Entire pronotal disc covered with fine and rather sparse punctures separated by a distance several times their diameter; punctation becomes somewhat denser and coarser laterally; along pronotal base doubled row of larger and denser punctures present. Pronotal hypomeron asetose.

Elytra. Elytral epipleuron ( Fig. 10 ) with sparse microscopic punctation; marginal epipleural stria fine, complete; marginal elytral stria fine, slightly carinate, slightly prolonged onto elytral base, for short distance continues along elytral apex, apical elytral stria absent otherwise. Humeral elytral stria weakly impressed on basal elytral fourth, indiscernible in several specimens; inner subhumeral stria well impressed, originating near apex of humeral elytral stria, terminating near apex of first dorsal elytral stria and parallel to it; first dorsal elytral stria basally linked with humeral elytral stria, continues as elongate costa almost along its entire length, stopping short of elytral apex; between sutural elytral stria and elytral suture 2–3 rows or minuscule punctures present. Dorsal elytral striae 2–4 slightly surpassing or almost reaching half of elytral length apically, well-impressed, punctate, their basal ends curved inwardly; fourth (occasionally also third) dorsal elytral stria basally connected with almost complete and well-impressed sutural elytral stria that is serrated on its apical half; sutural elytral stria stops short of elytral apex. Elytral disc on basal fourth covered with fine minuscule punctures separated by several times their diameter, approximately near mid-length of elytral disc punctures become distinctly denser and elongate, on apical elytral third to fourth punctures almost confluent, occasionally forming elongate rugae, separated by less than their own diameter, interspaces among them with very fine alutaceous microsculpture visible with strong magnification; extreme elytral apex glabrous.

Propygidium covered with very dense punctures similar to those on apical third of elytral disc; pygidium ( Fig. 8 ) on basal half with perhaps even denser punctation; punctures become much sparser and finer on apical pygidial half, extreme pygidial apex only with microscopic punctation. Lateral margins of pygidium elevated, costate.

Prosternum ( Fig. 9 ). Tuter lateral costa of prosternum not reaching prosternal process, interrupted by antennal cavity. Prosternal process compressed, keel-like, covered with sparse fine punctures; marginal prosternal stria fine, present along apical prosternal margin. Prosternal process apically with two large and deep prosternal foveae; carinal prosternal striae well impressed, divergent apically, terminating in prosternal foveae; lateral prosternal striae short, costate, apically terminating near prosternal foveae.

Mesoventrite ( Fig. 10 ) approximately three times as broad as long; marginal mesoventral stria fine, complete; disc of mesoventrite with scattered fine punctures, interspaces with microsculpture; meso-metaventral stria complete, undulate.

Metaventrite ( Fig. 10 ) except for basal fifth that bears several rows of rather large shallow and dense punctures entire metaventral disc covered with sparse microscopic punctation, punctures separated several times their diameter. Lateral disc of metaventrite ( Fig. 11 ) with almost confluent shallow punctures; metepisternum with similar, if even denser punctures.

First visible abdominal ventrite. Basal third slightly depressed, bearing several rows of large dense elongate punctures; rest of first visible abdominal ventrite almost impunctate; in and around apical angles larger and dense punctures appear.

Legs. Protibia ( Figs 12–13 ) dilated, outer margin without distinct teeth, only with 8–9 short denticles diminishing in size proximally; protibial spur rather short, growing out from near tarsal insertion, protarsal groove shallow; protibial stria complete, without another complementary stria next to it; setae of outer row rather short, regularly-spaced. Tuter part of posterior surface of protibia ( Fig. 13 ) lacunose; separated from median part by double stria beset with setae; posterior protibial stria complete, with dense setae running along posterior protibial stria; setae form near apex several thickly-set inner-posterior denticles; inner row of setae dense, regular; apical margin with two apical denticles. Mesotibia ( Fig. 14 ) and metatibia ( Fig. 15 ) dilated, with sparse denticles on outer margins.

Male genitalia. Sternite VIII ( Figs 16–17 ) divided medially, apically with tuft of short dense setae and short velum; tergite VIII outwardly arcuate; sternite VIII and tergite VIII fused laterally ( Fig. 18 ). Tergites IW and W ( Figs 19–20 ) typical for the subfamily; spiculum gastrale dilated on both ends ( Fig. 19 ). Aedeagus ( Figs 21–22 ): phallobase markedly short, ratio to parameres 1: 8; parameres fused approximately on their apical half; aedeagus narrowing and pointed apically.

Differential diagnosis. Differs from the other congeners by the elevated pygidial margins as well as the costate first dorsal elytral stria. This is the largest species of the subgenus.

Distribution. Known from Brazil (Federal District, Mato Grosso, Minas Gerais, São Paulo). Newly recorded from Argentina (Misiones), Paraguay (Amambay) and Bolivia.

Biology. Found in nests of Acromyrmex ants ( ARRIAGADA 1987).

Remarks. Although S CHMIDT (1890) did not specify the number of specimens he used for the description of Saprinus latimanus , he gave a size range (5.50–6.00 mm), which means he must have examined multiple specimens, which are therefore syntypes. The male specimen was chosen as the lectotype to fix the identity of the species.

The Bolivian locality Mojos was not located on the Internet and is therefore depicted with question mark on the distributional map ( Fig. 56 ). It is possibly the province of Moxos, in the department of Beni ( Bolivia).

BLA CKWELDER (1944) erroneously listed this species twice, once in Saprinus (p. 179) and then in Platysaprinus (p. 180).

Figures

Figs 1–2. Euspilotus (Platysaprinus) latimanus (Schmidt, 1890). 1 – habitus, dorsal view; 2 – ditto, ventral view.

Figs 3–4. Euspilotus (Platysaprinus) latimanus (Schmidt, 1890). 3 – head, dorsal view; 4 – mentum.

Figs 5–7. Euspilotus (Platysaprinus) latimanus (Schmidt, 1890). 5 – labrum, dorsal view; 6 – mandibles, dorsal view; 7 – antennal club showing sensory structures of the antenna, dorsal view.

Figs 8–13. Euspilotus (Platysaprinus) latimanus (Schmidt, 1890). 8 – pygidium; 9 – prosternum; 10 – mesoventrite; 11 – lateral disc of metaventrite G metepisternum; 12 – protibia, dorsal view; 13 – ditto, ventral view.

Figs 14–15. Euspilotus (Platysaprinus) latimanus (Schmidt, 1890). 14 – mesotibia, ventral view; 15 – metatibia, dorsal view.

Figs 16–22. Male genitalia of Euspilotus (Platysaprinus) latimanus (Schmidt, 1890). 16 – VIII sternite and tergite, ventral view; 17 – ditto, dorsal view; 18 – ditto, lateral view; 19 – IW and W tergites, dorsal view and IW sternite (spiculum gastrale), ventral view; 20 – IW and W tergites and IW sternite (spiculum gastrale), lateral view; 21 – aedeagus, dorsal view; 22 – ditto, lateral view.

Fig. 56. Distributional map of the subgenus Platysaprinus Bickhardt, 1916 of the genus Euspilotus, 1907.

Figs 36–44. Male genitalia of Euspilotus (Platysaprinus) ferreri sp. nov. 36 – VIII sternite and tergite, ventral view; 37 – ditto, dorsal view; 38 – ditto, lateral view; 39 – IW and W tergites, dorsal view; 40 – ditto, lateral view; 41 – IW sternite (spiculum gastrale), ventral view; 42 – ditto, lateral view; 43 – aedeagus, dorsal view; 44 – ditto, lateral view.