Triodontus
Creators: name: Frolov, Andrey V.
name: Montreuil, Olivier
name: Akhmetova, Lilia A.
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Orphnidae
Triodontus

description: Key to Triodontus species (males)
1 Central pronotal bulge with 3 more-or-less similar tubercles (Figs. 3 1 A–B); outer lobes of parameres rather large, mostly covering inner lobes (in lateral view: Fig. 31 E).............................................................. 2
- Central pronotal bulge with 2 tubercles (Fig. 35 A); outer lobes of parameres smaller, not covering inner lobes (in lateral view: Fig. 35 E).......................................................................................... 4
2 Body length less than 9.0 mm........................................................................... 3
- Body length 9.5–12.0 mm................................................................ T. hova (Fairmaire)
3 Abdominal sternite 8 narrower and more sinuate medially, without oval transverse concavity (Fig. 31 F); lateral lobes of parameres with small, keel-shaped processes on proximal parts (Fig. 31 E)................. T. nitidulus (Guérin-Méneville)
- Abdominal sternite 8 wider and less sinuate medially, with oval transverse concavity (Fig. 33 G); lateral lobes of parameres without small, keel-shaped processes on proximal parts (Fig. 33 F)............................. T. bicavatus (Fairmaire)
4 Abdominal sternite 8 with more-or-less developed tubercule medially (Fig. 34 F)................................... 5
- Abdominal sternite 8 without tubercule medially (Fig. 36 G)............................................. ………. 6
5 Tubercules of abdominal sternite 8 rounded apically (Fig. 34 F); lateral lobes of parameres with keel-shaped processes on prox- imal parts (in dorsal view, Fig. 34 D).............................. T. ankarafantsikae Frolov, Montreuil & Akhmetova
- Tubercule of abdominal sternite 8 with concavity apically (Fig. 35 G); lateral lobes of parameres with semicircular notches on proximal parts (in dorsal view, Fig. 35 E)................................. T. lemoulti Frolov, Montreuil & Akhmetova
6 Body length less than 6.5 mm ......................................................... T. modestus (Benderitter)
- Body length 9.0–12.0 mm.............................................................................. 7
7 Outer lobes of parameres strongly sclerotized, with distinct lateral notches and teeth situated more-or-less apically (Fig. 3 7 D)................................................................................................... 8
- Outer lobes of parameres less sclerotized, somewhat rolled up in most species; lateral notches, if present, situated more basally (Fig. 41 E)......................................................................................... 10
8 Outer lobes of parameres slender in lateral and dorsal view (Fig. 37 D)............................. T. owas Westwood
- Outer lobes of parameres wider, at lease in dorsal view (Figs. 39 E, 40E)......................................... 9
9 Outer lobes of parameres with slit-shaped lateral notches (Fig. 39 E)............ T. viettei Frolov, Montreuil & Akhmetova
- Outer lobes of parameres with wide lateral notches (Fig. 40 E)............................ T. hildebrandtii (Fairmaire)
10 Outer lobes of parameres long, curved downward and inward, with more-or-less separated strongly sclerotized lateral parts and membranous, overlapping medial parts; lateral notches absent (Fig. 41 E)........................... T. alticola Paulian
- Outer lobes of parameres of different shape, without distinctly separated lateral and medial, membranous parts; lateral notches absent or present..................................................................................... 11
11 Outer lobes of parameres without lateral notches (Fig. 42 F)................ T. fairmairei Frolov, Montreuil & Akhmetova
- Outer lobes of parameres with more-or-less distinct lateral notches and teeth (Figs. 43 F, 44D, 45E, 46D).............. 12
12 Outer lobes of parameres with distinct, slit-shaped lateral notches (in lateral view, Figs. 43 F, 44D)....................13
- Outer lobes of parameres less distinct, wider lateral notches (in lateral view, Figs. 45 E, 46D)......................... 14
13 Abdominal sternite 8 without fossa (Fig. 43 E); slit-shaped lateral notches of outer lobes of parameres longer (Fig. 43 F).................................................................................................. T. itremoi
- Abdominal sternite 8 with shallow but distinct, somewhat transversal fossa (Fig. 44 E); slit-shaped lateral notches of outer lobes of parameres shorter (Fig. 44 D)..................................................... T. copridoides Paulian
14 Outer lobes of parameres 1.3 times longer than inner lobes; inner lobes smaller (in lateral view) (Fig. 45 E).. T. hanskii Frolov
- Outer lobes of parameres as long as inner lobes; inner lobes larger (in lateral view, Fig. 46 D) T. inexpectatus Frolov, Montreuil & Akhmetova
description: Published as part of Frolov, Andrey V., Montreuil, Olivier & Akhmetova, Lilia A., 2016, Review of the Madagascan Orphninae (Coleoptera: Scarabaeidae) with a revision of the genus Triodontus Westwood, pp. 1-93 in Zootaxa 4207 (1) on page 58, DOI: 10.11646/zootaxa.4207.1.1, http://zenodo.org/record/200444