Myopsocus arthuri, Nel, A., Waller, A., Poinar, G. O. & Jr, 2006

Nel, A., Waller, A., Poinar, G. O. & Jr, 2006, The first fossil Myopsocidae (Psocoptera) in Dominican amber, Zootaxa 1349, pp. 63-68 : 64-66

Myopsocus arthuri sp. n.

( Figs 1–3 )

Material: holotype specimen Ps-2-32, in the same piece of amber as a Coleoptera : Histeridae ; in the Poinar amber collection maintained at Oregon State University, Corvallis, OR 97331 USA. The specimen originated from La Toca mine in the northern mountain range of the Dominican Republic.

Etymology: after Arthur Waller, grandson of the second author (A.W.).

Description: head 0.62 mm long, about 0.8 mm wide; labrum without ridges from base to margin; lacinia with small outer tooth and broad inner cusp divided into several smaller teeth; maxillary palp with P4 0.16 mm long, P3 0.06 mm long, P2 0.10 mm long, P2 with a strong apical spur; three ocelli present, arranged in triangle, lateral ocelli much larger than median ocellus, lateral ocellus 0.2 mm, median ocellus 0.1 mm; antenna with 12 flagellomeres; scape 0.16 mm long, pedicel 0.08 mm long; first flagellar segment f1 0.2 mm long, second f2 0.2 mm long; several long setae on frons; compound eyes large, reaching hind margin of head capsule; median epicranial suture not visible.

Fore wing glabrous, 2.6 mm long, 1.0 mm wide; colour pattern with mottling of irregular confluent dark marks, the margins with alternating brown and colourless banding; wing margin without incurving between branches of veins; pterostigma dark, thick, 0.17 mm wide; Rs and M fused for a short distance, 0.6 mm; areola postica 0.46 mm long, 0.09 mm wide, not joined to M by a cross-vein.

Hind wing hyaline, 2.0 mm long, 0.7 mm wide; Rs and M fused for 0.12 mm.

Fore femora 0.52 mm long, tibia 0.54 mm long, tarsi 0.16 mm long; mid femora 0.50 mm long, tibia 0.50 mm long, tarsi 0.20 mm long; hind femora 0.50 mm long, tibia 1.04 mm long, tarsi 0.44 mm long, t1 0 36 mm long, t2 0.04 mm long, t3 0.04 mm long; all tarsi three-segmented; claw with preapical tooth; pulvillus not visible.

Abdomen 0.70 mm long, deformed; male genitalia with phallosome rounded, without large bifid posterior extensions; epiproct with a pair of sclerotized prongs.

Figures

FIGURE 1. Myopsocus arthuri sp. n., holotype specimen Ps- 2 - 32, photograph of dorsal view (scale bar represents 1 mm).

FIGURE 2. Myopsocus arthuri sp. n., holotype specimen Ps- 2 - 32, photograph of ventral view (scale bar represents 1 mm).

FIGURE 3. Myopsocus arthuri sp. n., holotype specimen Ps- 2 - 32, drawing of general habitus (scale bar represents 1 mm).