Dacrysoma

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

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, 50 ).................................................. 2

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

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

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

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

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

4. Lateral margins of the pronotum clearly angled ( Fig. 64 ).............................................. denticulatm

- Lateral margins of the pronotum smoothly Rounded ( Fig. 69 ).............................................. fabrum

5. Dark species with densely foveate and pubescent pronota (as Fig. 58 )........................................... 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. 82,83 , 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

Figures

FIGURES 41 – 55. Dacrysoma spp. antennomeres 3 – 11 (hairs omitted). 41, D. ranomafanense; 42, D. varium; 43, D. denticulatum; 44, D. ravelosoni; 45, D. rahanitriniainae; 46, D. dolorosum; 47, D. nigerrimum; 48, D. fabrum; 49, D. imitatum; 50, D. longulum; 51, D. subinsulsum; 52, D. andasibense; 53, D. fusum; 54, D. pilosum; 55, D. delicatum.

FIGURES 62 – 76. Dacrysoma spp. pronota. 62, D. ranomafanense; 63, D. varium; 64, D. denticulatum; 65, D. ravelosoni; 66, D. rahanitriniainae; 67, D. dolorosum; 68, D. nigerrimum; 69, D. fabrum; 70, D. imitatum; 71, D. longulum; 72, D. subinsulsum; 73, D. andasibense; 74, D. fusum; 75, D. pilosum; 76, D. delicatum.

FIGURES 56 – 61. Dacrysoma spp. pronota. 56, D. ravelosoni (x 515); 57, D. nigerrimum (x 530); 58, D. ranomafanense (x 555); 59, D. fabrum (x 555); 60, D. varium (x 525); 61, D. rahanitriniainae (x 635).

FIGURES 77 – 89. Dacrysoma spp. spermathecae. 77, D. ranomafanense; 78, D. varium; 79, D. delicatum; 80, D. denticulatum; 81, D. rahanitriniainae; 82, 83, D. ravelosoni; 84, D. pilosum; 85, D. nigerrimum; 86, D. fabrum; 87, D. andasibense; 88, D. imitatum; 89, D. subinsulsum.