Mocyta

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Taxonavigation

Ordo: Coleoptera
Familia: Staphylinidae

Name

Mocyta Mulsant & Rey, 1874 – Wikispecies link – Pensoft Profile

• MocytaFor synonymy, see Gusarov 2003, Lohse et al. 1990, Smetana 2004

Diagnosis

Mocyta may be distinguished from the other genera of Canadian Aleocharinae except for Acrotona Thomson and Strigota Casey, by having the pronotal hypomeron not visible in lateral view. From Acrotona and Strigota, as well as other aleocharine genera, it may be distinguished by the following combination of characters: antennae very thin and pale, in most specimens contrasting with body colour (Figs 3a–7a); pronotum glossy, moderately convex, broad and shield-shaped, widest at or near middle, with pubescence directed posteriad in midline or entire central section of disc (Fig. 6a) and posterolaterad at sides, pronotum is at least as broad as the base of the elytra but in most specimens broader (Figs 3a–7a); median lobe of aedeagus of a simple form, tubus ca. half length of median lobe, narrowly tapering and rounded apically in dorsal view (Figs 3d, 4c, 5c) and straight and narrow apically in lateral view (Figs 3b, c, 4b, 5b, 6b), internal sac structures inconspicuous, usually elongate and not strongly pronounced (Figs 3b–d, 4b, c, 6b); male tergite VIII truncate apically and without teeth and other secondary sexual characters (Figs 3e, 4d, 5i, 6c), sternite VIII with longer macrosetae than those of females (Figs 3f, 4e, 6d); spermatheca with capsule hemispherical, or elongate and sac-shaped with usually small apical invagination and short neck, stem thin and regularly or irregularly coiled posteriorly (Figs 3g, h, 4f, 5d–h, 6e–g).
The shape of the spermatheca in Acrotona is different, with a capsule more or less spherical and extended to a broad and long neck, often pitcher-shaped, and a stem that is broader than that in Mocyta, regularly coiled posteriorly and often with a swelled apex (Fig. 2f). Strigota may be easily distinguished from Mocyta and Acrotona by the basal line of the abdominal tergum VIII laterally joining the base of the tergum in both sexes (Figs 1d, g), while in other athetines the basal line is separated from the tergite base (Figs 3e, i). For illustrations, see also Gusarov (2003).

Key to Canadian species of the genus Mocyta

Key to Canadian species of the genus Mocyta — J. Klimaszewski , R. Webster , C. Bourdon , G. Pelletier , B. Godin , D. Langor

1		Body bicoloured, head and at least posterior part of abdomen brown to almost black, and remainder of the body reddish to yellowish-brown, pronotum in most specimens paler than the rest of the body, in some specimens elytra mottled with small and irregular in shape darker spots (Figs 6a, 7a); genital structures as illustrated (Figs 6b, e–g, 7b–e)    2
–		Body uniformly brown to black except for paler appendages in most specimens    3
2		Pronotum approximately as broad as elytra (Fig. 6a); antennal articles V-X subquadrate (Fig. 6a); median lobe of aedeagus with tubus arcuate and apex pointing ventrally in lateral view (Fig. 6b); spermatheca with capsule sac-shaped and sinuate stem irregularly coiled posteriorly (Figs 6e–g); eastern Canada    Mocyta luteola (Erichson)
–		Pronotum much broader than elytra (Fig. 7a); antennal articles V-X in most specimens slightly elongate; median lobe of aedeagus with tubus straight and apex in horizontal position in lateral view; spermatheca with capsule club-shaped and straight stem coiled posteriorly (Figs 7b, e); eastern Canada    Mocyta discreta (Casey)
3		Elytra distinctly longer than pronotum (Figs 3a, 5a)    4
–		Elytra as long as or slightly shorter than pronotum (Figs 4a, 8a, e)    5
4		Pronotum approximately rectangular in shape, gradually narrowed in apical third of its length (Fig. 5a); spermathecal capsule pear-shaped, rounded apically and gradually narrowed posteriorly, apical invagination small and shallow, stem thin and irregularly twisted posteriorly (Figs 5d–h); only females are present in North America; adventive species broadly distributed across North America and transcontinental in Canada    Mocyta fungi (Gravenhorst)
–		Pronotum approximately trapezoidal in shape, strongly narrowed apically from basal third of its length (Fig. 3a); spermathecal capsule narrowly elongate and sac-shaped, apical invagination small and shallow; stem sinuate and irregularly twisted or coiled posteriorly (Figs 3g, h); median lobe of aedeagus with tubus straight in lateral view (Figs 3b, c); holarctic species known from northwestern Canada and Alaska    Mocyta amblystegii (Brundin)
5		Pronotum as broad as elytra (Fig. 4a); spermatheca with capsule pitcher-shaped and flat apically with elongate apical invagination, stem broadly coiled posteriorly (Fig. 4f); median lobe of aedeagus with tubus straight in lateral view (Fig. 4b); transcontinental in Canada and reported from Alaska, Oregon, California and Nevada    Mocyta breviuscula (Mäklin)
–		Pronotum in many specimens broader than elytra (Fig. 8e); spermatheca with capsule pear-shaped with short apical invagination, stem broadly irregularly coiled posteriorly (Fig. 8f); median lobe of aedeagus with tubus straight and apex in horizontal position in lateral view (Fig. 8b); known from sphagnum in black spruce and cedar forests and swamps; distributed in eastern Canada    Mocyta sphagnorum Klimaszewski & Webster, sp. n.

Taxon Treatment

• Klimaszewski, J; Webster, R; Bourdon, C; Pelletier, G; Godin, B; Langor, D; 2015: Review of Canadian species of the genus Mocyta Mulsant & Rey (Coleoptera, Staphylinidae, Aleocharinae), with the description of a new species and a new synonymy ZooKeys, (487): 111-139. doi

Images

Figures 1a–h. Strigota ambigua (Erichson): 1a habitus in dorsal view 1b median lobe of aedeagus in lateral view 1c median lobe of aedeagus in ventral view 1d male tergite VIII 1e male sternite VIII 1f spermatheca 1g female tergite VIII 1h female sternite VIII. Figures 1b–h after Gusarov 2003, slightly modified. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.  Figures 2a–h. Acrotona subpygmaea (Bernhauer): 2a habitus in dorsal view 2b median lobe of aedeagus in lateral view 2c median lobe of aedeagus in dorsal view 2d male tergite VIII 2e male sternite VIII 2f spermatheca 2g female tergite VIII 2h female sternite VIII. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.  Figures 3a–j. Mocyta amblystegii (Casey): 3a habitus in dorsal view 3b, c median lobe of aedeagus in lateral view 3d median lobe of aedeagus in dorsal view 3e male tergite VIII 3f male sternite VIII 3g–h spermatheca 3i female tergite VIII 3j female sternite VIII. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.  Figures 4a–h. Mocyta breviuscula (Brundin): 4a habitus in dorsal view 4b median lobe of aedeagus in lateral view 4c median lobe of aedeagus in dorsal view 4d male tergite VIII 4e male sternite VIII 4f spermatheca in lateral view 4g female tergite VIII 4h female sternite VIII. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.  Figures 5a–j. Mocyta fungi (Gravenhorst): 5a habitus in dorsal view 5b median lobe of aedeagus in lateral view 5c median lobe of aedeagus in ventral view 5d–h spermatheca 5i female tergite VIII 5j female sternite VIII. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.  Figures 6a–i. Mocyta luteola (Erichson): 6a habitus in dorsal view 6b median lobe of aedeagus in lateral view 6c male tergite VIII 6d male sternite VIII 6e–g spermatheca 6h female tergite VIII 6i female sternite VIII. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.  Figures 7a–g. Mocyta discreta (Casey): 7a habitus in dorsal view 7b median lobe of aedeagus in lateral view 7c male tergite VIII 7d male sternite VIII 7e spermatheca 7f female tergite VIII 7g female sternite VIII. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.  Figures 8a–h. Mocyta sphagnorum sp. n.: 8a male habitus in dorsal view 8b median lobe of aedeagus in lateral view 8c male tergite VIII 8d male sternite VIII 8e female habitus in dorsal view 8f spermatheca 8g female tergite VIII 8h female sternite VIII. Scale bar for habitus = 1 mm, and the remaining scale bars = 0.2 mm.