Gnypeta Thomson
Creators: name: Klimaszewski, Jan
name: Savard, Karine
name: Pelletier, Georges
name: Webster, Reginald
Publisher: name: Zenodo
Year: 2008
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Gnypeta

description: Genus <i>Gnypeta</i> Thomson urn:lsid:zoobank.org:act: 8297AF32-F721-495A-9B8B-97726265E3DE <i>Gnypeta</i> Thomson 1858: 33; Moore and Legner 1975: 421; Seevers 1978: 83; Blackwelder 1952: 173; Ashe 2001: 363; Smetana 2004: 489. Type species: <i>Homalota labilis</i> Erichson 1839 (= <i>Bolitochara carbonaria</i> Mannerheim 1830). <i>Euliusa</i> Casey 1906: 215; Moore and Legner 1975: 421; Seevers 1978: 83; Ashe 2001: 363; Smetana 2004: 489. Synonymized by Blackwelder 1952: 173. Type species: <i>Gnypeta lucens</i> Bernhauer 1905. <i>Gnypetoma</i> Casey 1906: 196; Moore and Legner 1975: 421; Seevers 1978: 83; Ashe 2001: 363; Smetana 2004: 489. Synonymized by Blackwelder 1952: 173. Type species: <i>Tachyusa baltifera</i> LeConte 1863. <b>Diagnosis</b> Members of this genus may be distinguished by the following combination of characters: tarsi 4, 5, 5-articulated (Figs 1, 2); body medium sized, length 2.3-3.6 mm, moderately to strongly glossy, integument finely punctate and pubescent, pubescence moderately long and often silky in appearance; head and pronotum distinctly narrower than elytra (Figs 1-20); abdomen as broad as elytra at base or moderately narrower (Figs 1-20), subparallel (Figs 3-7), or broadening apically (Figs 9, 18 20), first three visible tergites with deep basal impressions bearing coarse punctures but without pronounced longitudinal ridges (Fig. 1); postgenal carinae incomplete or absent (Seevers 1978); pronotum broadest in apical third or in the middle of the disc, and converging apically and basally (Fig. 1), pubescence distributed postero-laterad from the midline of the disc (Figs 1-20); elytra much broader than both head or pronotum, and often with wavy pubescence pattern on both sides (Figs 1-20); mesoventral process moderately broad, attaining middle of mesocoxae, its apex truncate (Fig. 2); metaventral process broadly rounded (Fig. 2); first visible three tergites with deep basal impressions bearing coarse punctures; legs long and slender; basal article of metatarsus moderately elongate and usually shorter than the two following articles combined (Fig. 1). GENITAL STRUCTURES: median lobe of aedeagus consists of an enlarged, swollen bulbus and short, triangularly produced tubus (Figs 40, 41, 49, 58, 67, 68, 76, 84, 92, 100, 109, 110, 118, 131, 132, 140, 141, 149, 157, 165, 173, 182), crista apicalis of bulbus large and subtriangular in shape laterally (Figs 39, 48, 57, 56); paramere broad with short apical lobe bearing three long subapical and one short apical macrosetae (Figs 60, 77, 85, 119, 142, 150); male tergite 8 truncate, or rarely emarginated apically, its apical margin smooth or with small 2-4 dents (Figs 43, 52, 61, 78, 103, 112, 167); spermatheca of four types: S-shaped (Figs 105, 114, 153, 161), C-shaped (Figs 122, 127-129, 136), hatchet-shaped (Figs 45, 54, 63, 72, 80, 88, 96), or club-shaped (Figs 169, 178, 186, 187); capsule tubular with apical part approximately spherical (Figs 145, 169, 178, 186, 187), tubular (Figs 122, 127, 153, 161), or funnel-shaped (Figs 45, 54, 63, 72); stem tubular, elongate, more or less sinuate and moderately swollen basally. Sternite 8 of male and female with broad space between basal margin and antecostal suture (Figs 44, 47, 53, 56, 62, 65). <i>Gnypeta</i> is readily distinguished from most genera of Oxypodini by having 4, 5, 5-articulated tarsi and from closely related <i>Tachyusa</i> by robust body (slender in <i>Tachyusa</i>), abdomen at base as broad as elytra or only slightly narrower (much narrower in <i>Tachyusa</i>), lack of distinctive ridges in abdominal tergal impressions, and by less elongate basal article of metatarsus (usually shorter than the two following articles combined). <i>Ischnopoda</i> Stephens is another related genus to <i>Gnypeta</i>, which differs externally by parallel-sided body, and extremely elongate metatarsus, exceeding 4/5 length of metatibia, and with basal article at least as long as the two following articles combined (Fig. 1). According to Pa&amp;sacute;nik (2007) the genus <i>Gnypeta</i> is closely related to <i>Tachyusa</i>, <i>Ischnopoderona</i> (Scheerpeltz) and <i>Ischnopoda</i>. The key for these four genera is provided by Pa&amp;sacute;nik (2007). <b>Collection and habitat data</b> Adults are associated with riparian habitats and debris along the margins of marshes, ponds, lakes, and streams (Ashe 2001). Some Canadian species were found in cold wet moss alongside streams. They may also occur in vegetation and litter along edges of streams, river, and lakes, in grass tussocks on mud flats, in gravel, wooded bogs, beaver lodges, and decaying fungi. <b>Phylogenetic affiliations</b> Seevers (1978) classified the genus <i>Gnypeta</i> in the tribe Oxypodini and the subtribe Tachyusae (=Tachyusina Thomson), together with the genera <i>Tachyusa</i> Erichson, <i>Trachyota</i> Casey, <i>Teliusa</i> Casey, <i>Gnypetella</i> Casey, <i>Meronera</i> Sharp, and <i>Brachyusa</i> Mulsant and Rey. He was tempted to consider Tachyusae as a distinct tribe on the grounds of 4, 5, 5-articulated tarsi and the genital features but he was afraid that this arrangement would obscure the relationship of <i>Gnypeta</i> to some related oxypodine genera. Bernhauer and Scheerpeltz (1926) did not separate genera of Tachyusina from Falagriini and grouped them together in the subtribe Falagriae of the tribe Myrmedoniini Ganglbauer. Lohse (1974) placed <i>Gnypeta</i> together with <i>Falagria</i> Leach, <i>Cordalia</i> Jacobs, <i>Myrmecopora</i> Saulcy and allied genera of the Falagriini. We agree with Seevers (1978) that grouping Tachyusae and Falagriae together, mainly on the grounds of 4, 5, 5-articulated tarsi and some superficial external similarities, was artificial and unwarranted. According to Seevers (1978) and confirmed here by us, the Tachyusae lack the following specialized features of the Falagriini: paramere with codylite velum separated from the paramerite velum; pronotum much narrower at base than apex and with distinct (at least one) median sulcus (sometimes two lateral sulci present); peritremes enlarged, and contiguous with or fused to elongate prosternum; procoxal cavities closed by peritremes, prosternum and inflexed hypomera. In addition the Falagriini have a basal abdominal impression bearing a median ridge, a very distinct shape of the median lobe of the aedeagus (ovoid bulbus and tubular broad tubus), small and narrowly elongate crista apicalis of bulbus, extremely long and coiled flagellum of the internal sac of the median lobe, and the spermatheca is of a different type with a small spherical capsule connected to a thin stem (Figs 165, 166, 169 in Klimaszewski and Winchester 2002). For diagnostic features of Tachyusina, see Seevers (1978). In his worldwide treatment of <i>Ischnopoda</i> Stephens, Pa&amp;sacute;nik (2006b) considered this genus to be closely related to <i>Tachyusa</i> and <i>Gnypeta</i>. Based on a comparative study of mouthparts and the body chaetotaxy, Yosii and Sawada (1976) suggested a restricted concept of <i>Tachyusa</i> -related genera and placed <i>Tachyusa</i> together with <i>Gnypeta,</i> and <i>Dacrila</i> Mulsant and Rey in the Tachyusa series of the Athetae. Their tribal affiliation of the <i>Tachyusa</i> -related genera with athetines is strongly questionable because of the differences in the genital features of the two groups e.g., lack of the “athetine bridge” in the median lobe of the aedeagus in genera of Tachyusini. Lohse (1989) excluded <i>Tachyusa</i>, <i>Gnypeta</i>, and <i>Dasygnypeta</i> Lohse from Falagriini and transferred them together with <i>Brachyusa</i> and <i>Dacrila</i> to the separate tribe Tachyusini. Pa&amp;sacute;nik (2006b), in his revision of the world species of <i>Tachyusa</i>, did not provide his view on the higher classification of <i>Tachyusa</i> -related genera but did not contradict the classification proposed by Lohse (1989). Pa&amp;sacute;nik (2007) published a revision of the African genus <i>Ischnopoderona</i> (Scheerpeltz), with cladistic analysis of the species. He included there the outgroup taxa of the genera <i>Gnypeta</i>, <i>Ischnopoda</i>, and <i>Tachyusa</i>. On his single most parsimonious cladogram the <i>Ischnopoderona</i> branched off as a sisiter taxon of <i>Tachyusa</i> and both of them combined formed a sister taxon of <i>Gnypeta</i>. The <i>Ischnopoderona</i> was the most basal branch of this tree.We believe that more research is needed before tribal classification of this group becomes clear and stable.
description: Published as part of <i>Klimaszewski, Jan, Savard, Karine, Pelletier, Georges &amp; Webster, Reginald, 2008, Species review of the genus Gnypeta Thomson from Canada, Alaska and Greenland (Coleoptera, Staphylinidae, Aleocharinae): systematics, bionomics and distribution, pp. 11-84 in ZooKeys 2 (2)</i> on pages 15-22, DOI: 10.3897/zookeys.2.4, http://zenodo.org/record/576410
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