Research Article |
Corresponding author: Jan Klimaszewski ( jklimaszewski@cfl.forestry.ca ) Academic editor: Adam Brunke
© 2017 Jan Klimaszewski, Tim Struyve, Caroline Bourdon, Julie-Ann Dorval.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Klimaszewski J, Struyve T, Bourdon C, Dorval J-A (2017) First record of Thecturota tenuissima Casey from Canada (Coleoptera, Staphylinidae, Aleocharinae). ZooKeys 702: 19-25. https://doi.org/10.3897/zookeys.702.19963
|
Thecturota tenuissima Casey, is reported for the first time from Canada, based on records from Ontario and Quebec. It was originally described from Rhode Island, USA, and no other records of this species in North America were published since that time. The specimens from Canada were captured by car netting. We provide here a redescription of this species and never before published images of habitus, tergite, and sternite VIII of both sexes, median lobe of aedeagus and spermatheca. The features distinguishing T. tenuissima from T. capito Casey (=pusio (Casey)), the only other species reported in Canada, are provided and illustrated.
Canada, new record, Thecturota , Aleocharinae , Staphylinidae , Coleoptera
Thecturota Casey, is a genus of the tribe Homalotini Heer, with 5 valid species in the Nearctic region (
All specimens in this study were dissected to examine the genital structures. Extracted genital structures were dehydrated in absolute alcohol, mounted in Canada balsam on celluloid micro-slides, and pinned with the specimen from which they originated. Images of the entire body and the genital structures were taken using an image processing system (Nikon SMZ 1500 stereoscopic microscope; Nikon Digital Camera DXM 1200F, and Adobe Photoshop software).
Morphological terminology mainly follows that used by
TSC Tim Struyve collection, Leuvensesteenweg. 187, 2800 Mechelen, Belgium.
Body slender, narrow, linear, small, length 1.0–1.7 mm; pubescence on pronotum and elytra directed laterad; head subquadrate with angular posterior tempora, as long and at least as wide as pronotum; eyes shorter than length of temples; antennomeres V-X strongly transverse and slightly incrassate apically, pronotum small, subquadrate or 1.2 times as wide as long, broadest subapically, pubescence directed anteriad and laterad from midline of disc; elytra short, at suture about as long as pronotum or slightly longer; abdomen subparallel. Male tergite VIII truncate apically; tubus of median lobe of aedeagus simple in form, its venter arcuate; internal sac structures inconspicuous; spermatheca small, capsule subspherical with small or without apical invagination, stem very short.
1 | Male tergite VIII nearly two times as wide as long (Fig. |
Thecturota capito Casey |
– | Male tergite VIII nearly as wide as long (Fig. |
Thecturota tenuissima Casey |
Thecturota
capito
Casey, 1893: 358.
Oligurota
pusio
Casey, 1893: 362.
Thecturota
exigua
Casey, 1894: 360. Synonymized by
Thecturota
histrio
Casey, 1911: 210. Synonymized by
Thecturota
laticeps
Casey, 1911: 208. Synonymized by
Body length 1.2–1.6 mm; body narrowly subparallel, linear, color variable: reddish brown with head and abdomen dark brown to piceous, or body piceous with reddish brown elytra, and yellowish-red legs, basal antennomeres and tip of abdomen; integument finely punctate; head subquadrate, larger than pronotum, with postocular area longer than diameter of eye, hind angles angular and rounded; antennomeres IV-X transverse and VI-X strongly transverse and about 3 times wider than long; pronotum broadest in apical third, narrow at base, pubescence directed laterad from midline of disc; elytra subparallel, at suture about as long as pronotum; abdomen subparallel, slightly broadening posterad. MALE: tergite VIII nearly two times as wide as long (Fig.
Thecturota capito Casey: 1 habitus in dorsal view 2 median lobe of aedeagus in lateral view 3 median lobe of aedeagus in dorsal view 4 male tergite VIII 5 male sternite VIII 6 female tergite VIII 7 female sternite VIII 8 spermatheca. Scale bars: 1 mm for habitus; 0.2 mm for remaining structures.
Origin: Nearctic. Canada: ON. USA: IA, IN, TX, VA.
Habitat: oak savanna from leaf, log, and grass litter. Collecting period: X. Collecting method: Berlese extraction of leaf, log, and grass litter. Live adults of this species were extremely slow-moving and the use of a Berlese funnel likely facilitated the capture of this minute beetle.
Thecturota capito Casey was recorded from Canada (ON) for the first time under a synonymic name T. pusio (Casey) by
Thecturota
tenuissima
Casey, 1893: 358.
Body length 1.5–1.7 mm; body narrowly subparallel, linear, yellowish brown with head, most of antennae, and apical part of abdomen dark brown to piceous, or body light brown with darker head and posterior abdomen or pronotum and elytra brown and remainder of the body dark brown to almost black; integument finely punctate; head subquadrate, larger than pronotum, with postocular area longer than diameter of eye, hind angles angular and rounded; antennomeres IV-X transverse and VI-X strongly transverse and about 2 times wider than long; pronotum broadest in apical third, narrow at base, pubescence directed laterad from midline of disc; elytra subparallel, at suture slightly longer than pronotum; abdomen subparallel, slightly broadening posterad. MALE: tergite VIII nearly as wide as long (Fig.
Origin: Nearctic. Canada: ON, QC. USA: RI.
Habitat: unspecified forests. Collecting period: VII. Collecting method: car netting.
CANADA, Quebec: Oka, ~ 45.49°N, 74.01°W, 12.VII.2016, car netting, Tim Struyve (
We thank Floyd Shockley for loan of types from