Myrmetes paykulli Kanaar, 1979

Lackner, Tomáš, 2010, Review of the Palaearctic genera of Saprininae (Coleoptera: Histeridae), Acta Entomologica Musei Nationalis Pragae (suppl.) 50, pp. 1-254 : 156-159

Myrmetes paykulli Kanaar, 1979

( Figs. 11 , 61 , 95 , 126 , 160–161 , 491–507 )

Hister piceus: PAYKULL (1809) : 231, nec MARSHAM (1802): 97 (misidentification).

Saprinus piceus: ERICHSON (1839) : 676; MARSEUL (1855): 505, t. XIX, Fig. 122 .

Gnathoncus piceus : JACQUELIN- DUVAL (1858): 112.

Myrmetes piceus: MARSEUL (1862) :515, t. XIII, Figs.1, 1a; THOMSON (1862): 243 ; SCHMIDT (1885a): 318; GANGLBAUER (1899): 378; REITTER (1909): 290, t. 67, Fig. 4 ; BICKHARDT (1916 –1917): t. IV, Fig. 35 ; REICHARDT (1941): 172, Fig. 82 ; HORION (1949): 346; MAZUR (1973): 41, Fig. 88 ; KRYZHANOVSKIJ & REICHARDT (1976): 122, Fig. 164 .

Myrmetes paykulli Kanaar, 1979: 24 . New substitute name for Hister piceus Paykull, 1809 , nec Marsham, 1802).

Myrmetes paykulli : VIENNA (1980): 113, Fig. 42 ; MAZUR & KASZAB (1980): 63, Fig. 32 ; MAZUR (1981a): 94, Fig. 128 ; MAZUR (1984): 107; MAZUR (1997): 217; YÉLAMOS (2002): 254, Figs. 122D, 128 ; MAZUR (2004): 95.

Note. Sensory structures of the antennal club were studied by DE MARZO & VIENNA (1982a).

Type locality. Sweden, near Uppsala.

Material examined. CZECH REPUBLIC: BOHEMIA: Liberec, Ruprechtice , xii.1997, nest of Formica rufa , 1 ♁, M. Švarc lgt .; Horní Jelení, 19.x.2001, 1 ♁, V. Zieris lgt. MORAVIA: Hnanice env., Na Fládnici , 30.iv.2003, 1 spec., Jiří Hájek lgt .; Srbce env., 28.xi.2001, 1 spec., V. Zieris lgt. ( TLAN) .

Redescription. Body length: PEL: 1.70–1.775 mm; APW: 0.525 –0.625 mm; PPW: 1.375 – 1.425 mm; EL: 1.175–1.25 mm; EW: 1.575 –1.675 mm.

Body ( Figs. 491–492 ) shortly oval, rounded, dorsally moderately convex, flattened ventrally, cuticle reddish-brown to dark brown with silk metallic luster; legs, mouthparts and antennae reddish.

Antennal scape ( Fig. 495 ) slender, surface imbricate, with few short setae, club ( Fig. 493 ) elongated, flattened, without visible articulation, entire surface with dense short sensilla intermingled with sparse somewhat longer erect sensilla; sensory structures of antennal club ( Fig. 11 ) in form of four rather small round circular sensory areas on ventral side and one large round vesicle on internal distal margin of ventral side.

Mouthparts. Mandibles ( Fig. 95 ) with curved outer margin, acutely pointed; sub-apical tooth on inner margin of left mandible minute; disc of labrum ( Fig. 61 ) imbricate, flattened; labral pits tiny, single weakly sclerotized seta present in each pit; labral fold significantly less developed; terminal labial palpomere thickened, its width about half its length; mentum sub-trapezoid, anterior angles ( Fig. 126 ) somewhat produced; anterior margin shallowly emarginate, with sparse, moderately long setae; lateral margins with one row of short ramose setae; disc of mentum glabrous; cardo of maxilla on lateral margin with few short setae; stipes triangular, with three short weakly sclerotized setae; terminal maxillary palpomere elongated, its width about one third its length, about three times as long as penultimate.

Clypeus ( Fig. 494 ) rectangularly rounded laterally, imbricate-punctate; frontal and supraorbital striae absent; frontal disc ( Fig. 495 ) microscopically imbricate-punctate; eyes flattened, visible from above.

Pronotum ( Fig. 491 ) transverse, about twice as broad as long; pronotal sides strongly narrowed anteriorly; apical angles conspicuous; marginal pronotal stria weakly impressed but complete; pronotal disc smooth; pronotal hypomeron glabrous; scutellum extremely small.

Elytral epipleura finely imbricate-punctate; marginal epipleural stria weakly impressed, complete; marginal elytral stria well impressed, slightly carinate, continued as shortened apical elytral stria, next obliterated; humeral elytral stria weakly impressed on basal fourth; inner subhumeral stria well impressed, carinate and almost complete, abbreviated on apical sixth; elytral disc with four thin dorsal elytral striae 1–4, abbreviated basally, apically surpassing half of elytral length, fourth dorsal elytral stria slightly shortened apically, sutural elytral stria absent; elytral disc microscopically punctate, punctation becomes more prominent in postero-lateral corners.

Propygidium almost completely exposed, with lateral depressions, imbricate-punctate, punctures separated by about their own diameter; pygidium likewise imbricate-punctate, punctures becoming sparser medio-apically.

Anterior margin of median portion of prosternum ( Fig. 496 ) rounded, pre-apical foveae absent; prosternal process flat, substrigulate; carinal prosternal striae narrowing anteriorly; lateral prosternal striae carinate, narrowing anteriorly; both sets of striae apically attaining anterior margin of prosternal process.

Anterior margin of mesoventrite deeply emarginate medially; discal marginal mesoventral stria anteriorly carinate, weakened laterally; disc of mesoventrite transverse, smooth; mesometaventral sutural stria absent. Intercoxal disc of metaventrite slightly convex, smooth; lateral metaventral stria weakly impressed, obliquely arcuate, shortened; lateral disc of metaventrite ( Fig. 497 ) concave, imbricate-punctate; metepisternum + fused metepimeron ( Fig. 497 ) likewise imbricate-punctate, but punctation coarser and denser.

Intercoxal disc of the first abdominal sternite laterally depressed, completely striate laterally; imbricate-punctate.

Protibia ( Figs. 499–500 ) slender, flattened, outer margin with sparse row of short thin denticles; setae of outer row extremely short and sparse; setae of median row similarly short and sparse, irregular; protarsal groove absent; anterior protibial stria inconspicuous; two thin short tarsal denticles present apically; protibial spur large, bent, growing out from apical protibial margin; apical margin of protibia posteriorly with two tiny apical denticles; outer part of posterior surface of protibia ( Fig. 500 ) imbricate, with two scattered irregular rows of microscopic sclerotized setae; delimitation from median part of posterior surface vague; posterior protibial stria complete, with rather dense sclerotized setae that become thicker towards apical margin; inner margin with double row of short setae.

Mesotibia ( Figs. 160–161 ) slender, outer margin with a single row of sparse thin denticles growing in size apically; setae of outer row extremely short and minute; setae of median row inconspicuous; posterior mesotibial stria inconspicuous; anterior surface of mesotibia imbricate, with two rows of well sclerotized short setae; anterior mesotibial stria complete, terminating in single tiny inner anterior denticle; mesotibial spur stout, short; apical margin with two tiny denticles; mesotarsus shorter than mesotibia; claws of apical tarsomere longer than half its length; metatibia ( Fig. 498 ) basically similar to mesotibia, but denticles of outer margin almost absent, only near tarsal insertion two minute denticles present; claws of apical tarsomere about half its length.

Male genitalia. Eighth sternite ( Figs. 501–502 ) not fused medially, vela without setae; eighth tergite and eighth sternite not fused laterally ( Fig. 503 ). Ninth tergite ( Figs. 504–505 ) longitudinally divided medially, tenth tergite ( Fig. 504 ) with two moderately long thin setae (styli?); spiculum gastrale ( Fig. 504 ) expanded on both ends. Aedeagus ( Figs. 506–507 ) slender, conspicuously long, approximately 1.5 times as long as 8 th sternite; basal piece of aedeagus short, ratio of its length: length of parameres 1: 6; parameres fused along their basal three-fourths; aedeagus apically slightly curved ventrad ( Fig. 507 ).

Figures

Figs. 9–28. Saprininae, sensory structures of the antennal club (vesicles marked with grey; sensory areas shaded): 9 – Saprinus (Saprinus) semistriatus (Scriba, 1790); 10 – Saprinus (Hemisaprinus) subvirescens (Ménétries, 1832); 11 – Myrmetes paykulli Kanaar, 1979; 12 – Styphrus corpulentus Motschulsky, 1845; 13 – Saprinus (Phaonius) pharao (Marseul, 1855); 14 – Ammostyphrus cerberus Reichardt, 1924; 15 – Chalcionellus amoenus (Erichson, 1834); 16 – Chivaenius kryzhanovskii Olexa,1980; 17 – Ctenophilothis chobauti (Théry,1900); 18 – Eopachylopus ripae (Lewis, 1885); 19 – Exaesiopus grossipes grossipes (Marseul, 1855); 20 – Hypocaccus (Hypocaccus) rugiceps (Duftschmid, 1805); 21 – Hypocaccus (Baeckmanniolus) dimidiatus dimidiatus (Illiger, 1807); 22 – Hypocacculus (Hypocacculus) metallescens (Erichson, 1834); 23 – Hypocacculus (Colpellus) praecox (Erichson, 1834); 24 – Hypocacculus (Nessus) rubripes (Erichson, 1834); 25 – Paravolvulus lateristrius (Solskij, 1876); 26 – Pholioxenus phoenix (Reichardt, 1930); 27 – Reichardtiolus duriculus (Reitter, 1904); 28 – Xenonychus tridens (Jacquelin-Duval, 1852).

Figs. 47–73. Saprininae, labral structures, dorsal view (left half showing external and right half showing internal structures): 47 – Alienocacculus neftensis (Olexa, 1984); 48 – Ammostyphrus cerberus Reichardt, 1924; 49 – Chalcionellus amoenus (Erichson, 1834); 50 – Chivaenius kryzhanovskii Olexa, 1980; 51 – Eopachylopus ripae (Lewis, 1885); 52 – Eremosaprinus vlasovi (Reichardt, 1941); 53 – Euspilotus (Neosaprinus) perrisi (Marseul, 1872); 54 – Exaesiopus grossipes grossipes (Marseul, 55); 55 – Gnathoncus rotundatus (Kugelann, 1792); 56 – Hypocaccus (Hypocaccus) rugiceps (Duftschmid, 1805); 57 – Hypocacculus (Hypocacculus) metallescens (Erichson, 1834); 58 – Hypocacculus (Colpellus) praecox (Erichson, 1834); 59 – Hypocacculus (Nessus) rubripes (Erichson, 1834); 60 – Microsaprinus therondianus (Dahlgren, 1973); 61 – Myrmetes paykulli Kanaar, 1979; 62 – Paravolvulus lateristriatus (Solskij, 1876); 63 – Philothis (Philothis) arcanus Reichardt, 1930; 64 – Philothis (Atavinus) atavus (Reichardt, 1931); 65 – Philothis (Farabius) hexeris Reichardt, 1930; 66 – Pholioxenus phoenix (Reichardt, 1930); 67 – Reichardtiolus duriculus (Reitter, 1904); 68 – Saprinus (Saprinus) semistriatus (Scriba, 1790); 69 – Saprinus (Hemisaprinus) subvirescens (Ménétries, 1832); 70 – Saprinus (Phaonius) pharao (Marseul, 1855); 71 – Styphrus corpulentus Motschulsky, 1845; 72 – Xenonychus tridens (Jacquelin-Duval, 1852); 73 – Xenophilothis choumovitchi (Thérond, 1965).

Figs. 90–98. Saprininae, mandibles, ventral view: 90 – Gnathoncus rotundatus (Kugelann, 1792); 91 – Hypocaccus (Baeckmanniolus) dimidiatus dimidiatus (Illiger, 1807); 92 – Hypocacculus (Hypocacculus) metalescens (Erichson, 1834); 93 – Hypocacculus (Colpellus) praecox (Erichson, 1834); 94 – Hypocacculus (Nessus) rubripes (Erichson, 1834); 95 – Myrmetes paykulli Kanaar, 1979; 96 – Paravolvulus lateristrius (Solskij, 1876); 97 – Philothis (Philothis) arcanus Reichardt, 1930; 98 – Philothis (Atavinus) atavus (Reichardt, 1931).

Figs. 109–141. Saprininae, anterior margin of mentum, ventral view: 109 – Alienocacculus neftensis (Olexa, 1984); 110 – Ammostyphrus cerberus Reichardt, 1924; 111 – Axelinus ghilarovi Kryzhanovskij, 1976; 112 – Chalcionellus amoenus (Erichson, 1834); 113 – Chivaenius kryzhanovskii Olexa, 1980; 114 – Ctenophilotis chobauti (Théry, 1900); 115 – Eopachylopus ripae (Lewis, 1885); 116 – Eremosaprinus vlasovi (Reichardt, 1941); 117 – Euspilotus (Neosaprinus) perrisi (Marseul, 1872); 118 – Exaesiopus grossipes grossipes (Marseul, 1855); 119 – Gnathoncus rotundatus (Kugelann, 1792); 120 – Hypocaccus (Hypocaccus) rugiceps (Duftschmid, 1805); 121 – Hypocaccus (Baeckmanniolus) dimidiatus dimidiatus (Illiger, 1807); 122 – Hypocacculus (Hypocacculus) metallescens (Erichson, 1834); 123 – Hypocacculus (Colpellus) praecox (Erichson, 1834); 124 – Hypocacculus (Nessus) rubripes (Erichson, 1834); 125 – Microsaprinus therondianus (Dahlgren, 1973); 126 – Myrmetes paykulli Kanaar, 1979; 127 – Paravolvulus ovillum (Solskij, 1876); 128 – Philothis (Philothis) arcanus Reichardt, 1930; 129 – Philothis (Atavinus) atavus (Reichardt, 1931); 130 – Philothis (Farabius) hexeris Reichardt, 1930; 131 – Pholioxenus phoenix (Reichardt, 1930); 132 – Reichardtiolus duriculus (Reitter, 1904); 133 – Saprinillus paromaloides Kryzhanovskij, 1974; 134 – Saprinus (Saprinus) semistriatus (Scriba, 1790); 135 – Saprinus (Hemisaprinus) subvirescens (Ménétries, 1832); 136 – Saprinus (Phaonius) pharao (Marseul, 1855); 137 – Styphrus corpulentus Motschulsky, 1845; 138 – Turanostyphrus ignoratus Tishechkin, 2005; 139 – Xenonychus tridens (Jacquelin-Duval, 1852); 140 – Xenophilotis choumovitchi (Thérond, 1965); 141 – Zorius funereus (Schmidt, 1890).

Figs. 160–161. Myrmetes paykulli Kanaar, 1979, mesotibia: 160 – dorsal view; 161 – ventral view.

Figs. 491–500. Myrmetes paykulli Kanaar, 1979, SEM micrographs: 491 – habitus, dorsal view; 492 – ditto, ventral view; 493 – antennal club, ventral view; 494 – clypeus and labrum, dorsal view; 495 – head, dorsal view; 496 – prosternum; 497 – lateral disc of metaventrite, metepisternum + fused metepimeron; 498 – metatibia, dorsal view; 499 – protibia, dorsal view; 500 – ditto, ventral view.

Figs. 501–507. Myrmetes paykulli Kanaar, 1979, male terminalia: 501 – 8th sternite and tergite, ventral view; 502 – ditto, dorsal view; 503 – ditto, lateral view; 504 – 9th tergite, 10th tergite (dorsal view) and spiculum gastrale (ventral view); 505 – 9th tergite, 10th tergite and spiculum gastrale, lateral view; 506 – aedeagus, dorsal view; 507 – ditto, lateral view.

Fig. 1. Saprininae, biometric measurements.

Fig. 4. Saprininae, antenna, dorsal view, schematic.

Figs. 29–38. Saprininae, sensory structures of the antennal club (vesicles marked with grey; sensory areas shaded): 29 – Xenophilothis choumovitchi (Thérond, 1965); 30 – Zorius funereus (Schmidt, 1890); 31 – Alienocacculus neftensis (Olexa, 1984); 32 – Philothis (Philothis) arcanus Reichardt, 1930; 33 – Philothis (Atavinus) atavus (Reichardt, 1931); 34 – Philothis (Farabius) hexeris Reichardt, 1930; 35 – Euspilotus (Neosaprinus) perrisi (Marseul, 1872); 36 – Gnathoncus rotundatus (Kugelann, 1792); 37 – Eremosaprinus vlasovi (Reichardt, 1941); 38 – Microsaprinus therondianus (Dahlgren, 1973).

Figs. 81–89. Saprininae, mandibles, ventral view: 81 –Alienocacculus neftensis (Olexa, 1984); 82 – Ammostyphrus cerberus Reichardt, 1924; 83 – Chalcionellus amoenus (Erichson, 1834); 84 – Chivaenius kryzhanovskii Olexa, 1980; 85 – Ctenophilotis chobauti (Théry, 1900); 86 – Eopachylopus ripae (Lewis, 1885); 87 – Eremosaprinus vlasovi (Reichardt, 1941); 88 – Euspilotus (Neosaprinus) perrisi (Marseul, 1872); 89 – Exaesiopus grossipes grossipes (Marseul, 1855).

Figs. 162–167.Euspilotus (Neosaprinus) perrisi (Marseul, 1872), variability of female pygidial sulci. Figs. 162–165 after OLEXA (1975).

Figs. 39–44. Saprininae, labrum, lateral view: 39 – Philothis (Farabius) hexeris Reichardt, 1930; 40 – Philothis (Atavinus) atavus (Reichardt, 1931); 41 – Saprinus (Phaonius) pharao (Marseul, 1855); 42 – Eremosaprinus vlasovi (Reichardt, 1941); 43 – Ctenophilothis chobauti (Théry, 1900); 44 – Philothis (Philothis) arcanus Reichardt, 1930.