Setodes truncatus Houghton, 2021

Houghton, David C., 2021, A new species of Setodes Rambur (Trichoptera: Leptoceridae) from northern Michigan, USA, Zootaxa 4965 (2), pp. 293-300 : 297

Setodes truncatus Houghton , new species

Figs 3A–3D

The male of S. truncatus n. sp. appears most similar to that of S. incertus within the S. incertus species group ( Schmid 1987). It is easily separable from that species by having short and truncate inferior appendages in lateral view, long and parallel processes of segment X in dorsal view, and in its pronounced, bare, acute, mesal projection being distinct at mid-length on each inferior appendage.

Male. General appearance typical of genus. Length of each forewing 6.0– 6.3 mm (n = 4) and with venation typical of genus. In ethanol, body uniformly straw-colored with brown sutures between most thoracic sclerites. Legs pale straw-colored. Wings uniformly straw-colored with sparse dark brown setae. Head with pronounced epicranial stem and dorsal triangle. Abdomen pale with dark brown terminal segments.

Male genitalia as in Fig. 3 . Segment VIII pale in color. Segment IX darkly sclerotized, broad and longitudinally long ventrally, longitudinally short and forming narrow V-shaped transverse bridge dorsally and fused with segment X. Pair of slender preanal appendages covered with short appressed setae, together lyrate in dorsal view. Segment X divided at ~1/3 length into pair of slender processes, extending beyond tips of preanal appendages; separated and approximately parallel for most of their length in dorsal view. Inferior appendages approximately as long as preanal appendages; not extending beyond tips of segment X processes, abruptly truncate and quadrate at apices in lateral view, and covered with long setae; each with bare, acute, mesal projection distinct at mid-length in lateral and, especially, in caudal views. Phallic apparatus reduced, consisting of endothecal membranes basally supporting pair of elongate parameres curving slightly ventrad and tubular phallicata approximating shape of duck’s head in lateral view, with small, longitudinal, dorsomesal flange at mid-length.

Female and larva. Unknown. Like the male, the larva and female of S. truncatus will probably be similar to those of S. incertus .

Holotype male. Michigan: Marquette County: Pine River at Entrance Road , Huron Mountain Club , 46.8828, -87.8687, 184 m, 25 June 2019, DC Houghton, uv light, HCIC2100358 . Deposited in the UMMZ (Catalog #UM- MZI-159435).

Paratypes: Same data as holotype except 28 June 2015, 1 ♂, HCIC2100175 ( HCIC) . Michigan: Marquette County: Salmon Trout River, Middle Falls , Huron Mountain Club , 46.8100, -87.8245, 225 m, 26 June 2019, DC Houghton, uv light, 2 ♂, HCIC2100359 ( HCIC) .

Etymology. Named for the truncate appearance of the inferior appendages.

Figures

FIGURE 3. Setodes truncatus, n. sp., male genitalia. 3A, segments IX–X, left lateral; 3B, terga VIII–X, dorsal; 3C, left inferior appendage, caudal; 3D, phallic apparatus, left lateral.