Three new species of Rhaphium Meigen, 1803 from mangroves in Hong Kong (Diptera: Dolichopodidae: Rhaphiinae)

Abstract

The genus Rhaphium Meigen, 1803 is recorded for the first time from mangroves in Hong Kong. Three species are described as new to science: Rhaphium hongkongense sp. nov. and Rhaphium spinulatum sp. nov., both tentatively belonging to the Rhaphium crassipes group sensu Negrobov & Grichanov (2010), and Rhaphium canniccii sp. nov. assigned to a new species group, the Rhaphium micans group. The status of Rhaphium mediocre (Becker, 1922) described from Taiwan and Rhaphium eburnea (Parent, 1926) from Shanghai is discussed. NGS barcodes for the new species are provided.

Review of Psenulus species (Hymenoptera, Psenidae) in the Hong Kong SAR, with description of three new species

“…In mangroves sites, a total of four species (sites 3 and 8 with the highest richness of three species per site) have been recorded; indicating the importance of these habitats in Hong Kong for Psenulus species, as previously shown for other insect families (e.g. Grootaert et al 2019). It should be noted, however, that an important variability in the species richness observed among sites could be observed, with a single species (either P. c. rohweri or P. continentis) collected in 47% of the mangrove sites sampled (8 out of 17).…”

“…A recent entomological survey of mangrove remnants in Hong Kong SAR provided numerous new records of arthropods and species new to science (e.g. Grootaert et al 2019). Among these, Psenulus was found to be one of the most abundant wasp genera, with large numbers of specimens occasionally recovered from a single Malaise trap.…”

Two new species of Rhaphium from Qinghai Province, China (Diptera, Dolichopodidae, Rhaphiinae)

“…Tang et al (2016) mentioned the R. bilobum group with the defining characters: thorax with 5 dc; cercus bifurcate with two simple lobes and the R. flavilabre group, diagnosed by: thorax with 5 dc; male genitalia shorter than epandrium, with long pale apical bristles which are at least as long as epandrium. Grootaert et al (2019) proposed the R. micans group, which differed by the following characters: cercus long, flattened, nearly twice as long as epandrium. The two new species described here do not fit the diagnoses of any of the above species groups.…”

“…The genus Rhaphium Meigen belongs to the subfamily Rhaphiinae and contains 206 known species in the world (Yang et al 2006;Yang et al 2011;Grichanov 2017;Qilemoge et al 2019;Grootaert 2019). Thirty-one species have been recorded in China, including 11 species distributed only in Oriental China, 17 species distributed only in Palaearctic China, two species from Oriental and Palaearctic China, and one species, R. dilatatum Wiedemann, 1830, with an unclear Chinese distribution (Yang et al 2006;Qilemoge et al 2019;Grootaert 2019).…”

Review of Palpostilpnus Aubert (Hymenoptera, Ichneumonidae, Phygadeuontinae), with the description of ten new species

“…In Hong Kong a Malaise trap was set by the fourth author (CB) at the same location between 2004 and the present (Barthélémy et al 2018;Barthélémy & Olmi 2019); it yielded only two specimens of Palpostilpnus (Fig. 3A-B), and the Hong Kong Mangroves Project (Grootaert et al 2019), which sampled 102 mangrove sites in 15 months, yielded a single additional specimen of Palpostilpnus. Summary descriptions of habitats are given in Table 1.…”