Ning, Li & Liu, 2020
The bark louse genus Symbiopsocus includes 23 species, all of which known from East Asia. Here we report the first record of Symbiopsocus from Vietnam, with description of Symbiopsocus vietnamicus sp. nov. A revised key to the species of Symbiopsocus is provided.
Keywords: Psocodea, Psocomorpha, Psocinae, taxonomy, Indochina
|Symbiopsocus vietnamicus sp. nov., holotype male.|
Symbiopsocus vietnamicus sp. nov.
Diagnosis. Male paraproct medially with a short scabrous lobe near trichobothrial field. Male hypandrium: dorsal lobe with lateral arm strongly protruding posteriad and with postero-medial region distinctly protruding, forming a pair of boot-shaped processes; ventral lobe lacking denticles, largely divided in two symmetrical parts, distally flattened and with a digitiform, acutely pointed process. Female external valve without posterior lobe
Distribution. Vietnam (Vinh Phuc).
Etymology. The specific epithet “vietnamicus” refers to the country of origin of this species.
Remarks. This new species resembles S. leptocladus Li, 1997, S. subrhombeus Li, 2002 and S. quadripartitus Li, 2002 in having similar configuration of the male hypandrium (e.g. dorsal lobe with lateral arms protruding posteriad and with postero-medial region separated into a pair of projections, which are curved laterally at tip), it also appears to be similar to S. quadripartitus Li, 2002 in having similar phallosome (i.e. anteriorly and posteriorly both distinctly protruding). The new species can be distinguished from the above species by the ventral lobe of the male hypandrium, distally flattened with a digitiform process. There are six species of Symbiopsocus known with only females, i.e. S. unitus (Li, 2002), S. undulates (Li, 2002), S. nanyuensis (Li, 1992), S. magnificus (Li, 2002), S. latus (Li, 2002) and S. changbaiensis (Li, 2002). The new species can be distinguished from all these species by the female external valve without posterior lobe.