Leuctra duplicata Claassen, 1923

Grubbs, Scott A. & Wei, Summer, 2017, Morphological Systematics Of Leuctra Duplicata Claassen, 1923 Species Group (Plecoptera: Leuctridae), Illiesia 13 (5), pp. 59-69 : 61-63

Leuctra duplicata Claassen, 1923

Atlantic Needlefly

http://lsid.speciesfile.org/urn:lsid: Plecoptera .speciesfile.org: TaxonName:460988

( Figs. 1–26 , 33 )

Leuctra duplicata Claassen 1923:260 .

Holotype ♂ (CUIC), Labrador Lake (Cortland or Onondaga Co.), New York

Leuctra duplicata Needham & Claassen, 1925:227 .

Leuctra duplicata Illies, 1966:88 .

Leuctra duplicata Zwick, 1973:399 .

Leuctra duplicata Hitchcock, 1974:75 .

Male. The dorsal abdominal process of the 8 th abdominal tergum emanates anteriorly, extending ca. ½ length of the segment and terminates on the posterior margin as a raised, bilobed process with small, distally rounded or subtriangular lobes ( Figs. 13–15 ). The dorsal abdominal process of the 7 th abdominal tergum is nearer the anterior margin of the segment and raised as a bar with smaller, distally rounded lobes ( Figs. 13–15 ). The paired dorsal processes exhibit variation, namely in the distance between lobes and “scaly” nature of the lobes that can be seen only with SEM ( Figs. 13–15 ). The specilla are broadest medially in lateral view due to an expanded keel, noticeably thickened in dorsal ½, and taper very little distally ( Figs. 1–6 ); the outer margin has low, tooth-like tubercles present along the outer distal ⅓ ( Figs. 7–12 ); in caudal view the basal ⅓ is concave ( Figs. 7–9, 11 ). The subanal lobes are widest basally, narrow and tapering slightly along entire length, slightly recurved anteriorly in distal ½, and extend nearly to the distal tip of the specilla ( Figs. 1–6 ). The vesicle base is short, body expanded medially and ovoid in shape, and entire surface covered in long, socketed bristles ( Fig. 16 ).

Female. The 8 th abdominal sternum bears a prominent, broadly-rounded medial tubercle on the anterior ½ that occupies the medial ca. ½ of the segment ( Figs. 17–26 ). The subgenital plate terminates in large, broadly rounded or subtriangular lobes separated by a v-shaped notch ( Figs. 17–26 ).

Distribution. Canada: NB, NS, ON, PE, PQ. USA: CT, MD, ME, NJ, NY, OH, PA, VA, WV ( DeWalt et al. 2017), MA (Needham & Claassen 1925, p. 228), NC, RI, VT (new state records).

Figures

Figs. 1–6. Leuctra duplicata, paraprocts, lateral view. 1, West Virginia, Gandy Creek, 450X; 2, Virginia, spring near Lewis Fork bridge, 400X; 3, Maryland, tributary to Toliver Run, 400X; 4, North Carolina, Flat Laurel Creek, 400X; 5, Rhode Island, small stream into Wilbur Pond, 370X; 6, Nova Scotia, Silvey Brook, 400X. sa = subanal lobe, sp = specillum.

Figs. 7–12. Leuctra duplicata, paraprocts, caudal view. 7, West Virginia, Gandy Creek, 500X; 8, Virginia, spring near Lewis Fork bridge, 550X; 9, Maryland, tributary to Toliver Run, 600X; 10, Rhode Island, small stream into Wilbur Pond, 300X; 11, Quebec, tributary to Lac Cromwell, 350X; 12, Nova Scotia, Silvey Brook, 300X. sa = subanal lobe, sp = specillum.

Figs. 13–16. Leuctra duplicata. 13-15, abdominal processes, dorsal view; 16, vesicle, ventral view. 13, West Virginia, Gandy Creek, 330X; 14, Virginia, spring near Lewis Fork bridge, 220X; 15, Quebec, tributary to Lac Cromwell, 350X; 16, Nova Scotia, Silvey Brook, 500X.

Figs. 17–22. Leuctra duplicata, subgenital plate, ventral view. 17, Virginia, spring near Lewis Fork bridge, 200X; 18, Maryland, tributary to Toliver Run, 250X; 19, Rhode Island, small stream into Wilbur Pond, 270X; 20, Quebec, tributary to Lac Cromwell, 250X; 21, Nova Scotia, Silvey Brook, 190X; 22, Maine, Little Simsquish Brook, 270X.

Figs. 23–26. Leuctra duplicata, subgenital plate, ventral view. 23, West Virginia, Gandy Creek; 24, Virginia, spring near Lewis Fork bridge; 25, Maryland, tributary to Toliver Run; 26, Rhode Island, small stream into Wilbur Pond.

Fig. 33. Distribution map of Leuctra duplicata specimens examined in this study. Fig. 34. Distribution map of Leuctra maria specimens examined in this study.