Monotoma_na Bestimmungstabelle

Gattung Monotoma Herbst - Canada

Coleoptera - Monotomidae

Von Arved Lompe (adapted after Y. Bousquet & S. Laplante)
If you find any errors or omissions please mail me at mailbox@lompe.de

Bousquet, Y. & Laplante, S. (1999): Taxonomic review of the Canadian species of the genus Monotoma Herbst (Coleoptera, Monotomidae) - Proceedings of the Entomological Society of Ontario, 130:67-96 Private Datei: F:\taxa\coleo\scans\Bousquet&Laplante1999 Monotoma Kanada.pdf

Key to the species of Monotoma In Canada and adjacent parts of USA

Pronotum distinctly wider anteriorly [fig.1]. Pronotum with small shallow punctures, irregularly spaced, not contiguous [fig.2]. Aedeagus [fig.3]. 1.4-1.9 mm. Habitus [fig.4]. Europe, Caucasus, Japan, West Africa, Australia, New Zealand and America. The species has been accidentally introduced in North Anterica.

...longicollis (Gyll., 1827)

Pronotum more or less parallelsided [fig.5] or wider posteriorly [fig.6]. Pronotum with large, deep, contiguous or subcontigous punctures.

...2

fig.5

fig.6

Frons with 2 deep, longitudinal impressions [fig.7] [fig.8]. Aedeagus [fig.9] [fig.10]. 1.9-2.5 mm. Habitus [fig.11]. This species has been recorded from many countries around the world and is regarded as cosmopolitan.

...picipes Hbst., 1793

Frons without longitudinal impressions.

...3

Anterior angles of pronotum each produced in form of a large acute tooth [fig.12].

...4

fig.12

Anterior angles of pronotum at most with rounded or blunt nodiform projections.

...5

Pronotum with anterior angles usually projected latero-anteriorly [fig.12] [fig.13]. Aedeagus as in [fig.14] [fig.15]. 2.0-2.3 mm. Habitus [fig.16]. Bousquet & Laplante have seen specimens from England, France, Dalmatia, Greece,Morocco and from the United States (Massachusetts) and a single specimen from Canada.

...spinicollis Aubé, 1837

Pronotum with anterior angles usually projected laterally [fig.17]. Aedeagus as in [fig.18]. The species is probably widely distributed to the world. Bousquet & Laplante have seen specimens from the New World, Europe, Africa, and Australia. The species has not yet been found in Canada but is included in this work because of the possibiliy that it occurs there.

...johnsoni Bousquet & Laplante, 1999

fig.17

fig.18

Pronotal disc with 4 deep foveae, joined in pairs on each side to form 2 longitudinal furrows [fig.19] [fig.20]. Aedeagus [fig.21] [fig.22]. 1.9-2.3 mm. Habitus [fig.23]. This species has been reported from many countries around the world and is regarded as cosmopolitan.

...quadrifoveolata Aubé, 1837

Pronotal disc with 2, usually shallow, foveae in posterior half, rarely with 2 very shallow impressions in anterior half (not connected to basal foveae).

...6

Pronotum elongate (ratio L/W usually > 1.18), with extremity of antetior angles blunt [fig.24]. Aedeagus [fig.25]. 2.5-3.2 mm. This species occurs along the Atlantic Coast, from New Brunswick to Florida.

...producta Leconte

fig.24

fig.25

Pronotum usually less elongate (ratio L/W < 1.15), with extremity of anterior angles rounded.

...7

Temples relatively long, 0.5-0.8 times length of longitudinal diameter of eye [fig.26].

...8

fig.26

Temples relatively short, aboute 0.3 times length of longitudinal diameter of eye [fig.27].

...10

fig.27

Setae on head and pronotum short, wide, more or less recumbent. Pronotum with sides divergent posteriorly [fig.6]. Antennomere 3 slightly shorter than antennomere 2. Aedeagus [fig.28]. 2.0-2.7 mm. This species occurs from Michigan to Alberta, south to Colorado. It is known in Canada from two localities In manitoba and Alberta.

...myrmecophila Bousquet & Laplante, 1999

fig.6

fig.28

Setae on head and pronotum elongate, narrow, suberect. Pronotum with sides more or less parallel to slightly rounded posteriorly [fig.26] [fig.5]. Antennomere 3 as long as antennomere 2.

...9

fig.26

fig.5

Body dorsally more or less uniformly reddish. Pronotum with sides slightly sinuate to parallel, anterior angles slightly protruding [fig.26] [fig.29]; disc rather flat, with 2 more or less distinct impressions on anterior half. Aedeagus [fig.30] [fig.31]. 1.8-2.2 mm. Habitus [fig.32]. This species has been recorded from various European countries, Caucasus, Turkistan, Siberia, New Zealand and North America.

...testacea Motsch., 1845

Head and pronotum reddish brown to piceous, distinctly darker than elytra. Pronotum with sides usually rounded. Anterior angles more protruding [fig.5]; disc rather convex without impressions on anterior half. Aedeagus [fig.33] [fig.34]. 1.9-2.5 mm. Habitus [fig.35]. This species has been recorded from various countries in Europe, North Africa, Caucasus, Syria, Siberia, New Zealand and North America.

...bicolor Villa, 1835

#10

Abdomen with 2 exposed tergites. ♂

...11

Abdomen with 1 exposed tergite. ♀

...13

#11

Last visible abdominal sternite with large median, oval, finely granulate depression. Pronotum slightly elongate (1.10-1.15 times as Iong as wide) [fig.36]. Aedeagus [fig.37]. 1.8- 2.2 mm. North America.

...arida Casey

fig.36

fig.37

Last visible abdominal sternite at most with small, shallow, relatively smooth depression. Pronotum subquadrate (1.00-1.07 times as long as wide) [fig.27].

...12

fig.27

#12

Tegmen shallowly notched at apex [fig.38]. 1.9-2.4 mm. North America. Introduced to Italy, Croatia.

...americana Aubé, 1837

fig.38

Tegmen markedly notched at apex [fig.39]. Size as americana. This species lives in eastern North America from Ontario south to Florida and Texas. It is known in Canada from one locality in Ontario.

...emarginata Bousquet & Laplante, 1999

fig.39

#13

Pronotum slightly elongate (1.10-1.15 times as long as wide) [fig.36]. See arida LZ >>>11

fig.36

Pronotum subquadrate (1.00-1.07 times as long as wide).

...14

#14

Posterior margin of head with small, hornlike, median projection [fig.27]. Last visible abdominal sterite smooth. See americana LZ >>>12

fig.27

Posterior margin of head without median projection. Last visible abdominal sternite with small protuberance in most specimens. See emarginata LZ >>>12

americana
arida
bicolor
emarginata
johnsoni
longicollis

myrmecophila
picipes
producta
quadrifoveolata
spinicollis
testacea

First prepared: 28.05.2019
Latest edit: 06.10.2021 - 18:12:26
Version: 4.1.2 by: Arved Lompe
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