Agapetus stylifer Etnier, Baxter, and Parker 2010, new species

Agapetus stylifer Etnier, Baxter, and Parker new species Fig. 25a, 25b, 25c. Map 25 Type material. Holotype, MMT male, length 5.0 mm, EX UT 1.596. Smith Fork trib. 0.5 rd mi w of US 70 on TN 96, 36.0140 o N, 86.0021 o W, DeKalb Co., TN, 18 April 2000, emerged 28 April 2000, D. A. Etnier. (NMNH) Allotype, female, length 5.4 mm, taken with holotype, emerged 30 April 2000. (NMNH) Paratypes taken with holotype, all EX UT 1.596. CASC, MMT male emerged 25 April, MMT female emerged 24 April; CUAC, MMT male pupa emerged 25 April, MMT female emerged 24 April; INHS, MMT male emerged 21 April, MMT female pupa emerged 30 April, 1 larva, 1 prepupa; ROME, MMT male emerged 23 April, MMT female pupa emerged 30 April; SCHC, MMT male emerged 23 April; MMT female emerged late April; UMSP, 1 MMT male, emerged 24 April; 1 MMT female pupa emerged late April, 1 prepupa; NMNH, 1 larva, 1 prepupa; 1 early pupa, 4 male pupae, 3 female, 3 female pupae remain in UT 1.596, adults emerged late April 2000. Additional material examined. Tennessee, Clay Co.: UT 1.638, Little Proctor Cr. at Proctor Cr. Road & Old Watson Road, 13 May 2000, 3 larvae /prepupae, 1 early pupa, 7 male + 6 female mature pupae/ adults; Putnam Co.: UT 1.369, creek 1.7 rd mi s of Overton Co. line on TN 84, 21 April 1998, 6 larvae / prepupae, 3 early pupae, 10 male + 2 female mature pupae/adults; Smith Co.: UT 1.594, upper Mulherrin Cr. along TN 53 1.9 rd mi n of jct. Brush Cr. Road, 18 April 2000, 3 larvae /prepupae, 10 male + 10 female mature pupae/adults; UT 1.595, spring run trib. to Mulherrin Cr. at 244 TN Hwy. 53, n of I-40, 18 April 2000, 1 larva, 5 male + 6 female mature pupae/adults; Sumner Co.: UT 1.598, Deshea Cr. at Bright Lane, 0.3 rd mi s of US 31E, 16 April 2000, 7 larvae /prepupae, 1 early pupa, 7 male + 5 female mature pupae/adults; UT 1.600, Lick Cr. at TN 25, 0.7 rd mi e of Rock Springs Road, 16 April 2000, 14 larvae / prepupae, 4 unopened pupae, 2 male + 1 female mature pupae/adults; UT 1.603, Jones Spring at Tyree Spring Road, White House, 16 April 2000, 1 prepupa, 1 male + 1 female; UT 1.621, Otter Fork at 801 Wolf Hill Road, 2.3 rd mi se of US 231/31E, 10 May 2000, 1 larva, 7 male + 6 female mature pupae/adults; Trousdale Co.: UT 1.592, Rocky Cr. trib. at US 231, 0.8 rd mi s of TN 25, 16 April 2000, 7 larvae / prepupae, 4 early pupae, 15 male + 14 female mature pupae/adults; Wilson Co.: UT 1.567, Shop Spring Br. trib. 0.2 rd mi n of jct. US 70/ Shop Spring Road, 29 March 2000, 15 larvae /prepupae, 8 male + 2 female mature pupae/adults; UT 1.571, West Prong Jennings Cr. at Poplar Hill Road, s of I-40, 29 March 2000, 20 larvae /prepupae, 4 male + 3 female mature pupae/adults. Diagnosis. Differs from all species treated herein except A. pegram in having the posteriodorsal and posterioventral corners of segment X well sclerotized, curved outward, and ending in a sharp point (dorsal and ventral views). Very similar to and probably closely related to A. pegram, from which it differs most notably in having the posteriodorsal corner of X (lateral view) tapering to a non-darkened sharp point, forming a deep, U-shaped emargination between it and the distinct ventral projection (versus blunt, conspicuously darkened apically, and with only a shallow notch between it and the rounded posterioventral corner of X in A. pegram). In addition, in dorsal and ventral views of X only the ventral terminal denticle is bent outward at about 90 o from its base, with the dorsal denticle a smooth continuation of its base; in A. pegram both terminal denticles are sharply bent from their base. Description. Male. Length 4.8-5.5 mm (n = 28). Male genitalia: Lateral view (Fig. 25a), anterior margin of IX thickened, slanting down and forward to midline at 45 o angle, then vertical or angled slightly posteriad to convex ventral margin; dorsal margin 1/3 length of ventral margin; posterior margin vertical to just below lower edge of preanal appendage, then with a short shoulder that projects posteriad, than nearly vertical to lower articulation of inferior appendage. Preanal appendages subrectangular, exposed length = 2 times maximum depth, which occurs near truncate tip, dorsal margin convex, ventral margin straight to slightly concave; dorsal edge with about 10 long, erect setae on distal 3/4. Segment X laterally well sclerotized, with ventral margin more opaque, darker area narrow at base and expanding distally to include terminal denticle. Dorsal margin depressed at base, then convex to base of long, up-curved terminal denticle that extends nearly to tip of inferior appendage, with its tip extending slightly past posterioventral corner of X; ventral margin of X slightly concave, terminating in a blunt projection parallel to dorsal denticle; emargination between dorsal denticle and ventral projection U-shaped. Inferior appendages with length 3 times basal depth, margins concave dorsally and convex ventrally, tapering smoothly to terminal, upturned denticle at rounded distal end; denticle slants rearward at about 40 o from vertical. Darkened ridge extending forward from base of terminal denticle visible as a dark line 1/4 length of appendage; darkened denticulate ridge on ventral margin barely visible, extending forward from middle of appendage. Dorsal view (Fig. 25b). Anterior and posterior margins of IX broadly V-shaped, parallel, mid-dorsal length 1/2 length of exposed portion of preanal appendage. Preanal appendages divergent from body axis at 10 o, tips swollen and more divergent. Lateral margins of X concave anterior and posterior to slight swelling at 1/3 length, increasingly divergent to tips of dorsal denticles; inner margins convex and divergent to tips of denticles, separated by inconspicuous membranous area, U-shaped separation at base. Ventral details of X not conspicuous in dorsal view. Inferior appendages parallel sided, curved, divergent on basal 1/2, distal 1/2 convergent, distal denticle hooked. Ventral view (Fig. 25b). Anterior margin of IX concave, thickened; posterior margin broadly V-shaped (110 o angle) between bases of inferior appendages. A diamond-shaped, depigmented area on IX mid-ventrally, anterior to bases of inferior appendages. Inferior appendages basally somewhat inflated, then outer margin convex to truncate tip; terminal denticle hooked; inner margins in contact at base, then convex to origin of darkened ridge of irregular denticles at basal 1/3 of length, then curved inward and parallel to outer margin to tip. Darkened row of irregular denticles extends about 1/3 length of inferior appendage, often with slightly larger proximal denticle; an additional but less conspicuous denticulate ridge on inner margin occupying distal 1/4 of appendage. Inner margins of ventral arms of X convex and convergent in basal third, straight and divergent in distal 2/3, and appearing widest where they nearly meet on the midline; terminating in sharp, laterally projected, posterioventral denticle; posteriodorsal denticle of X a smooth continuation of dorsal margin. Larva. Not separable from that of A. pegram, see that description. Emergence dates. 19 April-24 May. Distribution. TN Clay, DeKalb, Putnam, Smith (2), Sumner (4), Trousdale, Wilson (2).
Published as part of Etnier, David A., Parker, Charles R., John T. Baxter, Jr., Long, Todd M. & Drive, News Sentinel, 2010, A review of the genus Agapetus Curtis (Trichoptera: Glossosomatidae) in eastern and central North America, with description of 12 new species, pp. 1-77 in Insecta Mundi 2010 (149) on pages 39-41, DOI: 10.5281/zenodo.5353074