Ptenidium (Peruvium)

Darby, Michael, 2016, Studies of Peruvian Ptiliidae (Coleoptera) 4: Peruvium a new subgenus of Ptenidium with seven new species, Zootaxa 4107 (3), pp. 392-402 : 393

Key to the known species of Ptenidium (Peruvium) from Peru

1. Pronotum and elytra with long pubescence.......................................................... capillatum

- Head only with long pubescence.......................................................................... 2

2. Large species> 1.2mm ............................................................................. grande

- Smaller species <1.0 mm............................................................................... 3

3. Antennae short, ( Fig. 37 )...................................................................... brevissimum

- Antennae longer (Figs. 38,39)............................................................................ 4

4. Scutellum with a central carina (Fig. 23)............................................................ carinatum

- Scutellum with at most a small carina in the centre of the anterior margin......................................... 5

5. Pronotal hind angles without clearly protruding setae, males with a short line of setae in the centre of the metaventral posterior margin ( Figs. 45–47 )........................................................................... inornatum

- Pronotal hind angles with clearly protruding setae............................................................6

6. Narrow, more parallel sided species, lateral margins of pronotum less rounded (Fig. 4)....................... contractum

- Lateral margins of pronotum more rounded, male with tuberosities on head (Fig. 8)........................... gibbosum

Figures

FIGURES 37 – 49. 37. P. brevissimum antenna; 38. P. contractum antenna; 39. P. gibbosum antenna. 40. P. gibbosum antennomeres 10 & 11 x 1340; 41. P. inornatum abdominal ventrite VII; 42. P. grande abdominal ventrite VII; 43. P. gibbosum mentum and mouthparts x 970; 44. P. grande mentum and submentum x 355; 45. P. inornatum posterior margin of metaventrum and abdominal segments x 665; 46. P. inornatum medial setae on posterior margin of metaventrum x 665; 47. P. inornatum insertion points of medial setae (abraided) on posterior margin of metaventrum x 3800; 48. P. grande abdominal ventrites x 635; 49. P. grande mesoventrum x 355.