Parachaetocladius lenferringtoni, William & Namayandeh & Hudson, 2024

William, R., Namayandeh, Armin & Hudson, Patrick L., 2024, Parachaetocladius lenferringtoni (Diptera: Chironomidae), a new orthoclad from North America, with keys to adult males and pupae of the Nearctic Parachaetocladius (Wülker, 1959), Zootaxa 5419 (2), pp. 245-264 : 246-247

Parachaetocladius lenferringtoni sp. nov., Bouchard & Namayandeh urn:lsid:zoobank.org:act:0A8EF7CF-7010-4ECE-B817-73B3D01121F3

Figs. 1–4 ; 6A, C, G, K ; 7A–D ; 8A–B; 9A, C, E–F

Type material. Holotype: Male; USA, Kansas, Kiowa County, Rezeau Ranch , channel of spring that feeds pond #6, R16 W, T295 , Sec 15, 5 ½, 19.iii.1982, leg. J.K. Gelhaus, deposited at SEMC.

Paratypes: 1 male and 1 female; Canada, Manitoba, Duck Mountains, South Duck River , 16.v.1980, leg. F. R. B. Winnipeg, Det. DRO 86, CH 5056, deposited at CNC . Paratype: 1 pupa, USA, Kansas, Kiowa County, Rezeau Ranch , channel of spring that feeds pond #6, R16 W, T295 , Sec 15, 5 ½, 19.iii.1982, leg. B.G. Coler and J.K. Gelhaus, deposited at SEMC . Paratype: 1 male; USA, Kansas, Scott Co., State Lake, Big Springs at County State Lake , 13.3 min N., 0.6 min W of Fort Scott, 14.iii.1984, leg. L.C. Ferrington Jr., deposited at CNC . Paratypes: 2 females, 2 pupae, and 1 larva, same data as previous specimen except deposited at SEMC . Paratypes: 2 males; USA, Minnesota, Dakota County, Pine Creek; Upstream @80 St. E ~ 2 min N of Cannon Falls, 44.5435º, -92.9003º, 24.iv.2003, leg. R. W. Bouchard Jr., deposited at UMSP . Paratype s: 6 males, 1 female; USA, Minnesota, Dakota County, Trout Brook, Miesville Ravine Park Reserve , upstream of 280th Avenue , 9.2 km northeast of Cannon Falls , 44.5453º, -92.8057º, 8.v.2008; leg. R. W. Bouchard Jr., deposited at UMSP . Paratypes: 1 female, 1 pupae, same data as previous specimen except collection date is 10.iv.2023 . Paratypes: 2 pupae and 2 larvae, same data as previous specimens except collection date is 10.iv.2023 and deposited at RWB . Paratype: 1 pupa, same data as previous specimens except collection date is 10.iv.2003 and deposited at RWB . Paratype: 1 pupa, USA, Minnesota, Scott County, Eagle Creek, upstream of 125 th Street , ~ 2 mi East of Savage, 44.7752º, -92.3855º, 27.iii.2003, leg. R. W. Bouchard Jr., deposited at RWB . Paratype: 1 male; USA, Minnesota, Washington Co., Valley Creek, Belwin Preserve, 300 m downstream of Stagecoach Trail ; 2 km SW of Lakeland; elevation 344 m, 44.9192º, -92.7988º, 8.v.2008, leg. L.C. Ferrington Jr., deposited at UMSP . Paratype: 2 pupae, USA; Minnesota, Washington County, Valley Creek, Belwin Conservancy , 44.9188º, -92.8006º, 24.iv.2002, leg. L.C. Ferrington Jr., deposited at RWB . Paratype: 2 pupae, USA, Nebraska, Garden County, headwater spring of Blue Creek , upper end, 18 mi North and 1 mi West of Oskosh, 23.iv.1991, M.A. Blackwood and L.C. Ferrington Jr., deposited at UMSP . Paratype: 2 pupae, USA, Wisconsin, Burnett Co., Spring Brook , small first-order, summer-cool stream, UTM 15 T 0566695 E 5063330N, rift net, 11.v.2014, leg. D.C. Hansen, deposited at DCH . Paratype: 3 larvae, USA, Wisconsin, Buffalo County, unnamed tributary (1781700) to Traverse Valley Creek, Pape Valley Road , 10 m upstream from the confluence with Traverse Valley Creek , 2-xi-2021, leg. K. Rasmussen, deposited at UMSP .

Etymology. The new species is named in honor of the late Leonard C. Ferrington Jr., who originally collected the species in Kansas, USA, and who also collected specimens from Minnesota, USA.

Diagnosis. Parachaetocladius lenferringtoni sp. nov. can be distinguished from other Parachaetocladius species based on a combination of the following characteristics. Adult male with AR 0.82–0.98, 0.91; clypeus appearing hexagonal with lateral edges and the base curved; wing’s squama with 11–15, 14 setae, R 4+5 with 0–7, 2 setae; anal point shallow and cone-shaped; sternapodeme slightly arched, oral projections thick; inferior volsella blunt, gonostylus well expanded in mid to anterior section with crista dorsalis developed, stretching from mid to anterior sections, but visible at certain orientations. Adult female with AR 0.42–0.48, 0.46; clypeus appears hexagonal with lateral edges and the base curved; the apodeme lobe indistinct, however, large; notum 127–134, 130 μm long; tergite IX not divided, though a moderate mid-section notch is present, crescent-shaped. Pupa with 10–18 well-developed spines in posterior spine row on sternite III; anal lobes posteriorly extended into slender tips; a row of blunt spines posterolaterally on anal lobes and extending onto tips; inner macrosetae smaller than other two, denticles on anal macrosetae usually absent. Fourth instar larva with postmentum 167–185, 179μm long; antenna 6 segmented with last segment vestigial, AR 1.1–1.5, 1.3, blade 1.4–1.7, 1.5 × the length of antennal segments; anal tubules with one or two constrictions 0.6–0.8, 0.6 × the length of the posterior parapods.

Figures

FIGURE 1. Parachaetocladius lenferringtoni sp. nov., male (A–G). A. antenna. B. head; C. thorax; D. wing; E. hypopygium. F. gonostylus variation. G. gonostylus variation. Scale bars are 100 µm.

FIGURE 2. Parachaetocladius lenferringtoni sp. nov., female (A–E).A. head; B. thorax; C. wing; D. genitalia ventral view; E. genitalia, dorsal view. Scale bars are 100 µm.

FIGURE 3. Parachaetocladius lenferringtoni sp. nov., pupa (A–E), A. frontal apotome; B. thorax; C. abdominal tergites; D. abdominal sternites; E. posterior of tergite VIII and tergite IX, lateral view, arrow indicates the posterolateral blunt spines. Scale bars are 100 µm.

FIGURE 4. Parachaetocladius lenferringtoni sp. nov., larva (A–F). A. antenna; B. labrum. C. mandible; D. mentum; E. posterior portion of the larva; F. procercus, arrow indicates the comb. Scale bars are 50 µm.

FIGURE 6. Comparison of some characteristics of Parachaetocladius lenferringtoni sp. nov. and Parachaetocladius abnobaeus (Wülker, 1959) adult males. P. lenferringtoni sp. nov., (A, C, G, K); P. abnobaeus voucher, Alabama (B); P. abnobaeus paratype (D, H); P. abnobaeus voucher, Michigan (E, M); P. abnobaeus holotype of H. abnobaeus (F, I); P. abnobaeus voucher, Nova Scotia (J); P. abnobaeus voucher, Pennsylvania (L). A–B. antenna. C–F. sternapodeme; G–J. inferior volsella (blue arrows); K–M. clypeus. Scale bars are 50 µm. Images D and H courtesy of Mr. M. Spies and Dr. M. Kotrba of ZSM.

FIGURE 7. Comparison of pupal tergite I (A, C, E, G, I, K) and sternite III (B, D, F, H, J, L). Parachaetocladius lenferringtoni sp. nov., USA: Minnesota(A–B); USA: Wisconsin (C–D, blue arrow indicates weak spine row on tergite I). Parachaetocladius hirtipectus Saether, 1969, Holotype, CANADA: British Columbia (E–F, blue arrow indicates large L seta in segment I). Parachaetocladius abnobaeus (Wülker, 1959), USA: South Carolina (G–J, blue arrow indicates weak spine row on tergite I); FRANCE: West Pyrenees (K–L). Scale bars are 100 µm.