Stonefly Species Leuctra duplicata (Tiny Winter Blacks)

Source: Morphological Systematics Of Leuctra Duplicata Claassen, 1923 Species Group (Plecoptera: Leuctridae)

Atlantic Needlefly http: // lsid. speciesfile. org / urn: lsid: Plecoptera. speciesfile. org: TaxonName: 460988 (Figs. 1 – 26, 33)Source: Morphological Systematics Of Leuctra Duplicata Claassen, 1923 Species Group (Plecoptera: Leuctridae)

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 1/3 (Figs. 7 – 12); in caudal view the basal 1/3 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).