Cedrimyia margareti, Namayandeh & Hudson, 2022

Namayandeh, Armin & Hudson, Patrick L., 2022, Two new Orthocladiinae (Diptera: Chironomidae) collected in overlooked places of Midwest USA, Zootaxa 5099 (1), pp. 120-128 : 124-125

publication ID	https://doi.org/ 10.11646/zootaxa.5099.1.5
publication LSID	lsid:zoobank.org:pub:F0242AC1-4E64-40AD-BC3C-038CB36851BB
DOI	https://doi.org/10.5281/zenodo.6328923
persistent identifier	https://treatment.plazi.org/id/7845E8DA-9E57-427D-80C5-BEE7B922A672
taxon LSID	lsid:zoobank.org:act:7845E8DA-9E57-427D-80C5-BEE7B922A672
treatment provided by	Plazi
scientific name	Cedrimyia margareti
status	sp. nov.

Treatment

Cedrimyia margareti View in CoL sp. nov.

Type material. Holotype ♂; 24.III.2010; USA, Ohio, Hocking Co., Hocking Hills State Park, Queer Creek below Cedar Falls ; 39.4194, -82.5269; leg. Patrick Hudson; deposited at ARC GoogleMaps . Paratype 3♂♂ same as the holotype. Paratype 1♂; 16.X.1990; USA, Wisconsin, Douglas Co., Superior Harbor, East End of Lake Superior ; 46.691, -91.985; leg. Patrick Hudson; deposited at ARC GoogleMaps . Paratype 2♀; 24.III.2010; USA, Ohio, Hocking Co., Hocking Hills State Park, Queer Creek below Cedar Falls ; leg. Patrick Hudson; deposited at ARC .

Etymology. The new species is named in honor of Margaret Hudson, who has been a great help in collecting type specimens, making this study possible.

Description. Male (n = 5).

Total length 2.8–3.2, 2.9 mm. Wing 2.3 mm long and 0.65 mm wide.

Coloration of mounted specimen. Head, thorax, halter brown. Legs and abdomen light to golden brown. Wing light to golden-brown

Head ( Fig. 1a View FIGURE 1 ). Antenna with 12 flagellomeres, last flagellomere with 8 sensilla chaetica, 2 nd –3 rd segments each with 2 sensilla chaetica, groove starts at 3 rd segment, AR 1.3–1.4. Eyes bare, with wedge-shaped dorsomedial extension. Temporal setae 9–10, including 3 inner verticals, 3–4 postoculars and 3–4 outer verticals. Tentorium narrow with small tentorial pit close to apex ( Fig. 1a View FIGURE 1 ), tentorium 135–156, 146 μm long. Clypeus rectangular, 87 μm long and 116 μm wide, bearing 5–7, 6 setae, setae 77–85, 80 μm long. Palpal segments lengths (in μm): 44–54, 50; 50–61, 57; 73–99, 81; 83–90, 85; 127–156, 148. Third palpomere with 1 sensilla clavata.

Thorax ( Fig. 1b View FIGURE 1 ). 2 scalpellate acrostichals in centre of scutum. Dorsocentrals 5–7, 6 in single row, prealars 2–3, scutellars 4 in single row. Humeral pit small. Antepronotal lobes developed, narrowing anteriorly, without gap and bare.

Wing ( Fig. 1c View FIGURE 1 ). Brachiolum with 2 setae. Squama with 5 setae. R with 5 and R 1 apparently bare, other veins without setae. Costa extended, extension 69 μm. R 4+5 ends just above M 3+4. Anal lobe squared. Microtrichia visible at> 100 x magnification.

Legs. Mid and hind tibia with long sparse beard, hind femur with keel. Pulvilli absent. Fore tibia spur 43–53, 47 μm long, mid tibia spurs 24–25; 18–23, 20 μm long, hind tibia spurs 44–51, 48 and 15 μm long, hind tibia comb with around 12 spines. Lengths and proportions of legs as in Table 1 View TABLE 1 .

Hypopygium ( Fig. 1d View FIGURE 1 ). Tergite IX with curved ridge running close to mid-section of anal point. Anal point narrowly triangular, long, reaching close to the apex of inferior volsella, bearing around 6 simple, short, and weak setae, distributed evenly along its mid-section, and pointing posteriorly, apex rounded; anal point 75–97, 84 μm long and 27–32, 29 μm wide. Virga present consists of two long spines, 50–54, 53 μm long. Sternapodeme straight and thick, 65–73, 69 μm long. Phallapodeme collar bone-shaped, 72–86, 81 μm long. Inferior volsella a prominent triangular lobe. Gonostylus squat-shaped, well expanded in mid to anterior section, surface with 3–4 strong, comparatively darker, spine-like setae; crista dorsalis developed, thin and blade-like, stretching from mid to anterior of gonostylus; gonostylus 65–75, 69 μm long. Gonocoxite 181–194, 188 μm long. HR 3, HV 3.

Female (n = 2).

Total length 2.0– 2.1 mm. Wing 2.1–2.4, 2.2 mm long and 0.76–0.86, 0.80 mm wide.

Coloration of mounted specimen. Head, thorax, halter brown. Legs and abdomen light to golden brown. Wing light to golden-brown

Head ( Fig. 2 View FIGURE 2 a-b). Antenna with 5 flagellomeres, last flagellomere with 10 sensilla chaetica, 3 rd –4 th segments each with 2 sensilla chaetica ( Fig. 2a View FIGURE 2 ), AR 0.5–0.6. Eyes bare, with short dorsomedial extension. Temporal setae 5, including 1 inner verticals, 1 postoculars, 2 orbitals and 1 outer verticals ( Fig. 2b View FIGURE 2 ). Tentorium long and narrow with small tentorial pit close to apex, tentorium 126–149, 137 μm long. Clypeus rectangular, 89 μm long and 109–127, 118 μm wide, bearing 5 setae, setae 88 μm long. Palpal segments lengths (in μm): 44–52, 48; 49–55, 52; 82–84, 83; 77–84, 80; 138–154, 146. Third palpomere with 1 sensilla clavata.

Thorax. 2 scalpellate acrostichals in centre of scutum. Dorsocentrals 5–6 in single row, prealars 2, scutellars 4 in single row. Humeral pit small. Antepronotal lobes developed, narrowing anteriorly, without gap and bare.

Wing ( Fig. 2c View FIGURE 2 ). Brachiolum with 2 setae. Squama with 5 setae. R with 6–10, 8, R 1 with 2–3 setae, R 4+5 with 2–3 setae, other veins without setae. Costa extended, extension 137 μm. R 4+5 ends just above M 3+4. Anal lobe squared. Microtrichia visible at> 100 x magnification.

Legs. Mid and hind tibia with long sparse beard, hind femur with keel. Pulvilli absent. Fore tibia spur 22–30 (26) μm long, mid tibia spurs 22–25, 23; 21–22 μm long, hind tibia spurs 38–52, 45 and 22 μm long, hind tibia comb with around 12 spines. Lengths and proportions of legs as in Table 2 View TABLE 2 .

Genitalia ( Fig. 2 View FIGURE 2 d-e). Gonocoxite narrow and long with 4 setae. Seminal capsules small, semi-circular, spermathecal ducts without loops ( Fig. 2d View FIGURE 2 ), seminal capsule 35–46, 40 µm long, 31 µm wide. Notum 174 µm long. Gonapophysis VIII divided into large ventrolateral lobe covering the base of smaller dorsomesal lobe. Apodeme lobe distinct. Tergite IX divided in 2 crescent-shaped setigerous light patches ( Fig. 2e View FIGURE 2 ). Cercus with circular base and pediform extensions ( Fig. 2e View FIGURE 2 ), 117 µm long and 43–55, 49 µm wide.

Ecology and habitat. Adults of the species were collected in the vicinity of Queer Creek just below Cedar Falls and along Superior Harbor in Lake Superior, vastly different habitats. Queer Creek is a third-order stream running through a deep ravine with rugged sandstone cliffs covered in part with lichen and with numerous seeps. Superior Harbor is part of a highly modified St. Louis River estuary for maintaining a safe harbor for both Great Lakes and international shipping. Extrapolating from these suggests that the habitat for this new genus is probably not truly aquatic but is presumably decaying moist organic matter along the shores of these two habitats. It is likely that the high organic (humus) soil of this region provides an ideal habitat for terrestrial Chironomidae . In East Fork Queer Creek, Ohio, close to our sampling location, Bolton and Jacobsen (2010) previously found close to seven species of terrestrial Chironomidae . The presence of emerging adults in May and again in October indicates that this species has more than one voltine.