Remenus, Ricker, 1952

Verdone, Chris J. & Kondratieff, Boris C., 2018, Holomorphology And Systematics Of The Eastern Nearctic Stonefly Genus Remenus Ricker (Plecoptera: Perlodidae), Illiesia 14 (5), pp. 81-125 : 89

Keys to Remenus Species

Adult males

1 Epiproct with a medial dorsal sclerite ( Figs. 23– 24 , 26–28 , 74–75 , 77–80 ) ……………………….... 2

1’ Epiproct without a medial dorsal sclerite ( Figs. 45–46 , 49–52 , 95–96 , 98–100 ) ………………...…. 3

2 Epiproct flattened laterally; terminating in a threadlike lash that greatly exceed the epiproct apex ( Figs. 23–24 , 26–28 ); Basal cowl clothed in dense golden-brown spinulae ( Figs. 23–24 ); tergum 9 with mediolateral patches of ~ 20 sensilla basiconica ( Fig. 23 ); pronotum mostly brown ( Fig. 22 ) …………………….… R. bilobatus

2’ Epiproct dorsoventrally flattened; lacking a threadlike lash that greatly exceeds the epiproct apex ( Figs. 74–75 , 77–80 ); basal cowl covered in dense lightly pigmented spinulae ( Figs. 74–75 ); tergum 9 lacking sensilla basiconica ( Fig. 74 ); pronotum mostly pale ( Fig. 72 ) …….. R. duffieldi

3 Epiproct widest toward apex in dorsal and lateral view, clavate; bearing a short translucent tube on apex ( Figs. 45–46 , 49–52 ); hemitergal lobes with <4 sensilla basiconica ( Figs. 45–50 ) …………………………………… R. daniellae sp. n.

3’ Epiproct dorsoventrally flattened, widest basally or at mid-length in dorsal view, tongue-shaped ( Figs. 95–96 , 98–100 ); hemitergal lobes with 12– 20 sensilla basiconica ( Figs. 95–97 ) …………………………………………. R. kirchneri

Adult females

1 Basolateral crease of subgenital plate nearly straight or convex posteriorly ( Figs. 29–30 , 81 ); subgenital plate broadly triangular ( Fig. 29 ), or rounded ( Figs. 30 , 81 ) …………………………... 2

1’ Basolateral crease of subgenital plate concave posteriorly ( Figs. 54–56 , 101–103 ); subgenital plate broadly rounded ( Fig. 54–55 , 101 ), occasionally with a shallow posteromedial emargination ( Fig. 56 , 102 ), or broadly triangular ( Fig. 103 ) ……………………………..................... 3

2 Subgenital plate broadly triangular ( Fig. 29 ) or rounded ( Figs. 30 ), extending ½ over sternum 9, or to the posterior margin of the sternum 9; pronotum mostly brown ( Fig. 22 ) …. R. bilobatus

2’ Subgenital plate broadly rounded, elongate, extending ⅘ over of sternum 9 or slightly beyond the posterior margin of sternum 9 ( Fig. 81 ); pronotum mostly pale ( Fig. 72 ) ... R. duffieldi

3 Subgenital plate broadly rounded ( Figs. 54–56 ), occasionally with a posteromedial emargination ( Fig. 56 ); basolateral margins convergent ( Figs. 54–56 ); found west of the French Broad River ( Fig. 115 ) ………………………. R. daniellae sp. n.

3’ Subgenital plate broadly rounded ( Fig. 101–102 ), occasionally with a shallow posteromedial emargination ( Fig. 102 ), or broadly triangular ( Fig. 103 ); basolateral margins parallel; found east of the French Broad River ( Fig. 115 ) …………………………………………. R. kirchneri

Figures

Figs. 21–24. Remenus bilobatus, adult male. 21. Right forewing, Crooked Creek, Carroll County, Virginia. 22. Head and pronotum, Calfpasture River, Augusta County, Virginia. 23–24. Blackrock Spring, SHEN, Albemarle County, Virginia. 23. Terminalia, dorsal, 24. Terminalia, lateral.

Figs. 25–28. Remenus bilobatus, adult male, Blackrock Spring, Albemarle County, Virginia. 25. Male hemitergal lobe. 26. Male terminalia, dorsal. 27. Male epiproct, dorsolateral. 28. Male epiproct, hair-like setae, dorsolateral.

Figs. 72–75. Remenus duffieldi, adult male. 72. Head and pronotum, Collins Creek, Swain County, North Carolina. 73–75. Tellico Creek, Macon County, North Carolina. 73. Abdominal terga 2–9. 74. Terminalia, dorsal. 75. Terminalia, lateral.

Figs. 77–80. Remenus duffieldi, adult male, Tellico Creek, Macon County, North Carolina. 77. Epiproct, dorsal. 78. Epiproct, dorsolateral. 79. Epiproct, splayed setae, dorsolateral. 80. Epiproct apex, dorsal.

Figs. 43–46. Remenus daniellae sp. n., adult male, tributary to Le Conte Creek, Sevier County, Tennessee. 43. Right forewing. 44. Head and pronotum. 45. Terminalia, dorsal. 46. Terminalia, lateral.

Figs. 47–50. Remenus daniellae sp. n. adult male. 47. Hemitergal lobe and sensilla basiconica, Ball Branch, Haywood County, North Carolina. 47–50. Tributary to Le Conte Creek, Sevier County, Tennessee. 48. Hemitergal lobe. 49–50. Epiproct variation, dorsal.

Figs. 51–53. Remenus daniellae sp. n., adult male, tributary to Le Conte Creek, Sevier County, Tennessee. 51. Epiproct, dorsal. 52. Epiproct, lateral. 53. Epiproct, palmate hair-like setae.

Figs. 93–96. Remenus kirchneri, adult male. 93. Right forewing, spring fed stream, Floyd County, Virginia. 94. Head and pronotum, tributary to Dodd Creek, Floyd County, Virginia. 95–96. Tributary to Rock Castle Creek, Patrick County, Virginia. 95. Terminalia, dorsal. 96. Terminalia, lateral.

Figs. 97–100. Remenus kirchneri, adult male, tributary to Dodd Creek, Floyd County, Virginia. 97. Hemitergal lobe. 98. Epiproct dorsal. 99. Epiproct dorsolateral. 100. Epiproct, hair-like setae, dorsolateral.

Figs. 29–30. Remenus bilobatus, adult female subgenital plate variation. 29. Crooked Creek, Carroll County, Virginia. 30. Calfpasture River, Augusta County, Virginia.

Fig. 81. Remenus duffieldi, adult female subgenital plate, Tellico Creek, Macon County, North Carolina.

Figs. 54–56. Remenus daniellae sp. n., adult female subgenital plate variation. 54. Ball Branch, Haywood County, North Carolina. 55. Little Laurel Branch, Sevier County, Tennessee. 56. Tributary to Le Conte Creek, Sevier County, Tennessee.

Figs. 101–103. Remenus kirchneri, adult female, subgenital plate variation. 101. Tributary to Rock Castle Creek, Patrick County, Virginia. 102. Tributary to Lick Fork, Floyd County, Virginia. 103. Tributary to Dodd Creek, Floyd County, Virginia.

Fig. 115. Distribution of Remenus daniellae, R. duffieldi, and R. kirchneri in the Blue Ridge Physiographic Province.