Ohio Caddizflies

1.         Spurs: 2-4-4; front wing discoidal cell long and ogival; fork 4 of front wing present; hind wing             with apex vein 2A free or absent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

            Spurs: 1-4-4; front wing discoidal cell short and wide, its anterior tip thickened; fork 4 of front             wing absent; hind wing with vein 2A curved up and fusing with 1A to form a large closed cell.             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chimarra, 6

2.         Hind wing with vein 2A atrophied beyond cross vein 2A2, so that only 1A and 3A reach the hind             margin of the wing (2 free anal veins), or winges reduced to tiny scales (overwintering                         females). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dolophilodes distinctus

            Hind wing with vein 2A extending beyond crossvein A2, so that 1A, 2A and 3A reach the hind             margin of the wing (3 anal veins), wiwngs never reduced to tiny scales. . . . . . Wormaldia, 3

3.         Apex of abdomen with a pair of 2-segmented claspers (males). . . . . . . . . . . . . . . . . . . . . . 4

            Apex of abdomen simple and tubular (females). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4.         Claspers with basal segment short and bulbous, apical segments much longer and spatulate;             apico-mesal projection of 7th sternite short. . . . . . . . . . . . . . . . . . . . Wormaldia shawnee

            Apical segment of claspers subequal in length to basal segment; apeco-mesal process of 7th             sternite very long. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wormaldia moestus

5.         Maxillary palpi with second segment cylindrical, of the same diameter as first segment. . . . . . .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Wormaldia moestus

            Maxillary palpi with second segment swollen on the mesal side, so that at this point it is                         considerably wider than the first segment. . . . . . . . . . . . . . . . . . . . . Wormaldia shawnee

6.         Apex of abdomen with a pair of well developed claspers (males). . . . . . . . . . . . . . . . . . . . 7

            Apex of abdomen without claspers (females). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7.         In lateral view, male clasper with apical potion elongate into a narrow, rounded fingerlike lobe. .             . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

            In lateral view, male clasper quadrate or ovate, with no elongation of apical portion. . . . . . 9

8.         Median projection of Ab9 sternum linear and elongate. . . . . . . . . . . . . . Chimarra obscura

            Median projection of Ab9 short and triangular, broadened at mid-length; also: dorsal                         aedeagal rod simple at apex with apices convergent. . . . . . . . . . . . . . . . . . Chimarra socia

9.         In caudal view, male claspers with high dorso;ateral shoulders, the margin of the dorsalmesal             process appearing concave or sinuate. . . . . . . . . . . . . . . . . . . . . . . . . . . Chimarra feria

            In caudal view, male claspers without shoulders, the margin of the dorsomesal process                         appearing straight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ; bursa co. Chimarra aterrima

10.        Ninth tergite constricted sharply near apex. . . . . . . . . . . . . . . . . . . . . . . . Chimarra socia

            Ninth tergite with later margins straight to apex. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

11.        Ninth sternite produced into well-defined, lateral sclerotized "ears"; bursa copulatrix with only a             single, delicate U-shaped sclerite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Chimarra obscura

            Lateral margins of ninth sclerite without lateral extensions; bursa copulatrix with a least a             complete sclerotized ring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

12.        Sclerite of bursa copulatrix ringlike, with a circular central clear area. . . . . . Chimarra feria

            Sclerite of bursa copulatrix purselike, with a semicircular central clear area. Chimarra aterrima

*www.aquaticinsects.org/Keys/Trichoptera/id_tom_philopotamidae.html