Cratyna (Cratyna) longicosta ( Hardy, 1956 ) Mohrig & Kauschke & Broadley, 2019

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 (Cratyna) longicosta ( Hardy, 1956) comb. n.

( Fig. 12 A – C )

Plastosciara (Cosmosciara) longicosta Hardy, 1956 [ Hardy (1956): 75 – 77, fig. 3 a – d].

Material studied: Holotype : Male, 24.xi.1952, Hawai‘i, O‘ahu, Hālawa Ridge, ex moss, leg. C.P. Hoyt (BPBM, No. 2482).

Conservation status. Embedded in Canada balsam. Head, palpus, antennae and wings isolated, wings under a separate cover slip. All morphological structures are rather well preserved.

Comments. The species is characterized by a 1-segmented palpus with a small rudimentary second segment, the basal segment not swollen, short oval and without a deepened sensory pit; antenna rather short, 4 th flagellomere with a l/w index of 1.2, hairs fine and somewhat shorter than the diameter of the basal node; legs slender, fore tibia without a distinct bristle patch; hypopygium with short and rather robust gonocoxites; gonocoxites with short and sparse hairs on the ventral inner side, gonostylus elongate, somewhat bulbous, apically with 2 fine and slightly curved spines and 2 fine subapical spines at the inner side. Hardy put the species into the genus Plastosciara , subgenus Cosmosciara . We agree with Hardy concerning the position in the genus Cratyna (= Plastosciara ) because of a shortened palpus and two pairs of fine spines on the inner side of the gonostylus.

Figures

FIGURE 12 A–C. Cratyna longicosta (Hardy, 1956). Holotype. A. Hypopygium; B. Basal segments of antenna; C. Palpus.