Bradysia kraussi Steffan, 1969

Broadley, Adam, Kauschke, Ellen & Mohrig, Werner, 2019, Revision of the black fungus gnat species (Diptera: Sciaridae) described by W. A. Steffan from Micronesia, Zootaxa 4683 (2), pp. 215-241 : 220-221

Bradysia kraussi Steffan, 1969

( Fig. 4 A–C)

Bradysia kraussi Steffan, 1969 [ Steffan (1969): 718 –719, fig. 19 a–e].

Material studied: Holotype, August 1952, Guam, Talofofo, S. Mariana Is., leg. N.L.H. Krauss (USNMENT 2083267).

Conservation status: Head and body with hypopygium isolated, strongly depressed, wings missing. Medium turbid (embedded in Hoyer’s medium).

= Bradysia snyderi Steffan, 1969 , syn. n.

( Fig. 4 C )

Bradysia snyderi Steffan, 1969 [ Steffan (1969): 723, fig. 21 a–g].

Material studied: Holotype, Male, 26.iv.–9.vi.1958, Bonin Islands , Haha Jima, Okimura, leg. P.M. Snyder (USN- MENT 2083267) . Paratype: 1 female, 26.iv.–9.v.1958, Bonin Is, Haha Jima, Okimura, leg. F.M. Snyder ( BPBM) .

Conservation status: Body and head separated, thorax and hypopygium rather strongly deformed by dehydration of the Hoyer’s medium following air inclusion.

Comments. The species is characterized by rather short flagellomeres with long necks, a small eye bridge with 2–3 rows of facets, palpus with a deepened patch of sensillae and a rather short 3 rd segment, an elongate gonostylus without an apical tooth but with 4 apical spines between the bristle-like apical hairs, one of them more robust and tooth-like, and the tegmen much wider than long. This uniform species could be detected by the unique shape of the tegmen, as shown in figure 19 d of Steffan (1969) and in our figure 4 A.

B. snyderi Steffan is identical in the armature of the gonostylus, the wide shape of the tegmen, the palpus with a deepened patch of sensillae and a short 3 rd segment. The flagellomeres seem to be somewhat longer but this is due to the deformation of the Hoyer’s medium. The figures 19 ( B. kraussi ) and 21 ( B. snyderi ) by Steffan (1969) are nearly identical, the specimens are conspecific.

Distribution. Mariana Islands ( Guam), Bonin Islands (Hahajima I.).

Figures

FIGURE 4 A–C. Bradysia kraussi Steffan, 1969. Holotype.A. Hypopygium; B. Head with palpus and basal segments of flagellomeres; C. Gonostylus from Bradysia snyderi Steffan, 1969, syn. n. of B. kraussi.