Dacrysoma longulum, Darby, Michael, 2013

Darby, Michael, 2013, Studies of Madagascan Ptiliidae (Coleoptera) 1: The Tribe Discheramocephalini including eighteen new species, Zootaxa 3718 (3), pp. 239-266 : 261

Dacrysoma longulum sp. n.

(Figs. 15, 50, 71, 98)

Habitus Fig. 15. Length. 0.75 mm. Colour: dusky yellow, antennae paler yellow. Antennomeres 3–11 Fig. 50 . Pronotum: length 0.20 mm, width 0.30 mm, Fig.71 . Elytra 0.47 mm long, 0.35 mm wide.

Male: aedeagus Fig.98

Female: unknown.

Etymology. This epithet is taken from the Latin adjective longulus, meaning rather long, and refers to the long antennomere 11.

Remarks. Immediately distinguishable by the very long bar to the dumb-bell shaped antennomere 11, a character which is shared by only one other species, D. dolorosum , from which it may be separated by the less hooked form of the aedeagus which lacks a narrowed tip, and by the less angled lateral margins of the pronotum. If the females are sexually dimorphic and have a shorter antennomere 11 (cf. Cissidium banari sp. n.) they may be present amongst those associated with the males from the same site assigned to the morphologically similar D. fabrum .

Type data. Holotype: ♂, Ranomafana N.P., sifting, S.21˚14’51’’ E. 47˚24’13’’, 1079 m, 16–18.xi.2010, P. Banar (BMNH). Paratypes: 4 ♂, same data as holotype; 2 ♂ Ranomafana N.P., sifting litter, Winkler app. extr., S. 21˚14’51.3’’ E.47˚24’09.1’’, 1118 m, 15.iv.2011, P. Banar & Raveloson (BMNH); 1 ex, ABT/ Nov/2011/04, sifting forest litter under palm tree and big rotten trunk, Winkler app. extr., S. 18o11’56.5’’ E.47o17’26.1’’, 1561 m, 17.xi.2011, L.S.Rahanitriniaina (BMNH).

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.