Cratyna (Pictosciara) adrostylata ( Hardy, 1956 )

Mohrig, Werner, Kauschke, Ellen & Broadley, Adam, 2019, Revision of black fungus gnat species (Diptera, Sciaridae) described from the Hawaiian Islands by D. E. Hardy and W. A. Steffan, and a contribution to the knowledge of the sciarid fauna of the Galápagos Islands, Zootaxa 4590 (4), pp. 401-439 : 416

Cratyna (Pictosciara) adrostylata ( Hardy, 1956)

( Fig. 10 A – D , 11 A – C )

Plastosciara (Cosmosciara) adrostylata Hardy, 1956 [ Hardy (1956): 72 – 73, fig. 1 a – c].

Literature: Hardy (1960): 214, fig. 67 a – c (as Plastosciara (Cosmosciara) adrostylata ).

Material studied: Holotype : Male, 4.ix.1927, Hawai‘i, O‘ahu, Waikāne, ex dead Xanthoxylum , leg. E. H. Bryan (BPBM, No. 2483). Paratype: 1 male, 4.ix.1927, Oahu, Waikāne, dead Xanthoxylum , “genitalia figured”, leg. E.H. Bryan ( BPBM) .

Conservation status. Embedded in Canada balsam. Head with antennae, palpus, wings and hypopygium isolated. All morphological structures are more or less strongly deformed, especially the body with legs and the hypopygium. The embedding medium is turbid from water originating from the specimen.

Comments. The species is characterized by a very short and swollen 3-segmented palpus with a large basal segment and a distinct palpifer, head with an eye bridge of 2-3 rows of facets, antenna very short, flagellomeres short, nearly quadrate in shape; legs rather short, apex of the fore tibia with a small irregular patch of bristles and a short spur; gonocoxites short and robust, gonostylus short, pointed to the apex, with a short apical tooth and 3 equal spines near the base of the tooth. The species belongs to the subgenus Pictosciara Mohrig in terms of the shape of the gonostylus and the arrangement of the spines. It is very similar (maybe identical) to Cr. brevipalpis Steffan from Micronesia. The only apparent differences are the short and nearly quadratic flagellomeres of Cr. adrostylata Hardy , versus those of Cr. brevipalpis Steffan , which are distinctly longer than wide. All other details seem to be identical despite the deformed morphological structures. The body is bleached but it appears that both species have the gonostylus darker than the gonocoxites. This is typical for Cratyna (Pictosciara) vera Mohrig, 2004 , as well.

Distribution. Hawaiian Islands (O‘ahu).

Figures

FIGURE 10 A–D. Cratyna adrostylata (Hardy, 1956). Holotype. A. Hypopygium; B. Basal segments of antenna; C. Palpus; D. Apex of fore tibia.

FIGURE 11 A–C. Cratyna adrostylata (Hardy, 1956). Paratype from O’ahu. A. Gonostylus; B. Head with eye bridge and flagellomeres 1–4; C. Wing.