Laccophilus alluaudi Regimbart 1900
Creators: name: Manuel, Michaël
name: Ramahandrison, Andriamirado T.
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Dytiscidae
Laccophilus
Laccophilus alluaudi

description: Key to species of the Laccophilus alluaudi -group (adapted and updated from Biström et al. 2015)
1. Large species, body length 5.0– 5.8 mm; along medial part of anterior pronotal margin with distinct dark transverse band; dark elytral vittae hollow, with pale enclosed area sharply delimited and of same colour as pale stripes in-between dark vittae................................................................................................ L. seyrigi
- Smaller species; along medial part of anterior pronotal margin without distinct dark transverse band; dark elytral vittae entirely dark or if hollow, with pale enclosed area diffusely delimited and of darker colour than pale stripes in-between dark vittae.. 2
2. Humeral region of elytron with well-delimited and contrasted dark brown marking(s) (anterior prolongation of lateral dark elytral vittae); median lobe as in Biström et al. (2015), Figs. 230–231...................................... L. comes
- Humeral region of elytron entirely testaceous or at most with faint, poorly delimited pale brown marking; median lobe different................................................................................................. 3
3. Median lobe in lateral view with dorsal outline evenly curved from base to apex (Biström et al. 2015, Fig. 237); in ventral view with distinct process near base on right side (Biström et al. 2015, Fig. 238); species from the Comoro Islands .... L. tigrinus
- Median lobe in lateral view with dorsal outline angled close to base; in ventral view lacking latero-basal process; species from Madagascar .......................................................................................... 4
4. Ventral surface of prothorax brown....................................................................... 5
- Ventral surface of prothorax testaceous.................................................................... 6
5. Metacoxal plates testaceous with only narrow area along lateral margin brown; mesotibia strongly modified, especially in male: broad with dorsal outline strongly curved and ventral outline straight (Fig. 5)..................... L. leguyaderi sp. nov.
- Metacoxal plates with lateral dark area much more extended; mesotibia unmodified (Fig. 6).......... L. bergsteni sp. nov.
6. Ventral surface entirely testaceous........................................................................ 7
- Ventral surface with metacoxal plates conspicuously darkened, at least in lateral half................................ 8
7. Dark elytral vittae ending close to anterior margin of elytron; median lobe in ventral view with marked constriction shortly before apex (Biström et al. 2015, Fig. 241); known only from the Isalo Massif in central-southern Madagascar ... L. pseustes
- Dark elytral vittae ending farther from anterior margin of elytron; median lobe in ventral view without marked constriction shortly before apex (Fig. 18); known only from the Makay massif in central-southern Madgascar......... L. makay sp. nov.
8. Median lobe in ventral view from angle to apex almost evenly broad and almost straight (Biström et al. 2015, Fig. 236).................................................................................................. L. furthi
- Median lobe in ventral view from angle to apex of unequal width and strongly twisted (Fig. 19–22)............ L. alluaudi
description: Published as part of Manuel, Michaël & Ramahandrison, Andriamirado T., 2020, Four new species of the diving beetle genus Laccophilus Leach, 1815 from Madagascar (Coleoptera, Dytiscidae, Laccophilini), pp. 482-502 in Zootaxa 4822 (4) on pages 493-494, DOI: 10.11646/zootaxa.4822.4.2, http://zenodo.org/record/4401787