Dacrysoma

Darby, Michael, 2013, Studies of Madagascan Ptiliidae (Coleoptera) 1: The Tribe Discheramocephalini including eighteen new species, Zootaxa 3718 (3), pp. 239-266: 250

publication ID

http://dx.doi.org/10.11646/zootaxa.3718.3.2

publication LSID

lsid:zoobank.org:pub:003A16B5-34C5-48F8-A41C-8B784F3B06CB

persistent identifier

http://treatment.plazi.org/id/187B8785-405E-0916-3BE6-FF15FA10F56A

treatment provided by

Plazi

scientific name

Dacrysoma
status

 

Key to Dacrysoma  species from Madagascar

(Note. dissection of genitalia is an essential prerequisite of accurate determinations)

1. Antennomere 11 longer than 9 and 10 combined ( Figs. 46, 50View FIGURES 41 – 55).................................................. 2

- Antennomere 11 not longer than 9 and 10 combined.......................................................... 3

2. Lateral margins of pronotum clearly angled ( Fig. 67View FIGURES 62 – 76); aedeagus with a narrow, hooked tip (Fig. 96)............. dolorosum 

- Lateral margins of pronotum less clearly angled ( Fig. 71View FIGURES 62 – 76); aedeagus without a narrow tip (Fig. 98).............. longulum 

3. Antennomere 11 not dumb-bell shaped, with only a slight median narrowing ( Figs.43, 48View FIGURES 41 – 55)............................ 4

- Antennomere distinctly dumb-bell shaped.................................................................. 5

4. Lateral margins of the pronotum clearly angled ( Fig. 64View FIGURES 62 – 76).............................................. denticulatm 

- Lateral margins of the pronotum smoothly Rounded ( Fig. 69View FIGURES 62 – 76).............................................. fabrum 

5. Dark species with densely foveate and pubescent pronota (as Fig. 58View FIGURES 56 – 61)........................................... 6

- Paler species with pronota more sparsely foveate and pubescent (as Figs. 56,57)................................... 7

6. Larger, more rounded, micropterous species........................................................ nigerrimum 

- Smaller, more flattened, apterous species....................................................... ranomafanense 

7. Larger species 0.80–0.96 mm ............................................................................ 8

- Smaller species 0.70–0.78 mm ........................................................................... 9

8. Large (0.94–0.96 mm) dark species with distinctive genitalia ( Figs. 82,83View FIGURES 77 – 89, 94). Females micropterous/ apterous... ravelosoni 

- Smaller, lighter species which are very difficult to separate without examination of the male and female genitalia which are distinctive (figs. and see notes attached to species’ descriptions)..... varium  , imitatum  , rahanatriniainae, andasibense  , fusum 

9. Pubescence longer................................................................................ pilosum 

- pubescence shorter................................................................................... 10

10. Pronotal foveae and pubescence denser............................................................. delicatum 

- Pronotal foveae and pubescence sparser........................................................... subinsulsum