Agapetus pinatus Ross

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, Insecta Mundi 2010 (149), pp. 1-77 : 35-36

Agapetus pinatus Ross

Fig. 22a, 22b, 22c . Map 22

Agapetus pinatus Ross 1938: 107

Type locality, Elkmont, Great Smoky Mountains National Park, Sevier Co., TN. ( INHS)

Diagnosis. Agapetus pinatus differs from all other Agapetus treated herein except A. baueri , A. flinti , A. jocassee , and A. iridis in having the length of the inferior appendages more than 4.5 times their depth. Differs from A. baueri and A. jocassee in having 3 (versus 2) denticles on each inferior appendage. Differs from both A. flinti and A. iridis in having the sub-terminal denticles on the inferior appendages closely approximated, one dorsal to the other (versus denticles rather evenly spaced).

Description. Male. Length = 4.6-6.2 mm (n = 30). Male genitalia: Lateral view ( Fig. 22a ), anterior margin of IX thickened, slightly convex, sloping down and forward at 45 o from rounded mid-depth area, then down and back, nearly straight, at 60 o to convex ventral margin; dorsal margin of IX essentially linear, just dorsal to prominent shoulder with horizontal to rounded dorsal margin that covers basal 1/8- 1/4 of preanal appendage; posterior margin of IX straight, vertical. Preanal appendage with exposed area 1/2 as long as X, length = 7 times depth, ventral margin convex, curved upward at tip to posteriodorsal point; dorsal margin straight to slightly concave. Preanal appendage deepest at swollen base, constricted at posterior edge of IX; 15-20 dorsal setae on entire exposed area. Segment X with heavily sclerotized ventral arms, less sclerotized dorsally, posteriodorsal area membranous. Ventral arms of X nearly vertical from base of preanal appendage, then smoothly curved through 90 o angle; nearly all of exposed portion slightly convex, sloping upward (10 o), equally deep throughout except for thickened area near mid-length. Distally, X terminates in outer denticle continuous with ventral margin to sloping upward at 30 o, this denticle with 1-3 points; a second denticle is medial and slightly posterior to this denticle and has a stellate cluster of 3-5 points. Inferior appendage nearly extending to tip of X, its length = 4.5 times depth; ventral margin straight and horizontal on basal 2/3, then upturned and concave to truncate tip; dorsal margin parallel to ventral margin on basal 2/3, then convex and slightly convergent with ventral margin to tip. A tiny, non-darkened, transverse denticle present at posterioventral angle, and a pair of darkened denticles on inner surface, one slightly above and slightly posterior to the other, on lower 1/2 at 2/3 length of inferior appendage; these denticles on basal edge of sclerotized area on posterior 1/3 of inner surface of appendage, basal inner surface of appendage non-sclerotized. Lateral edge of inferior appendage visible as faint horizontal line at mid-depth, especially in middle 1/3.

Dorsal view ( Fig. 22b ). Anterior margin of IX with deep, rounded concavity; posterior margin, if visible, with broadly V-shaped emargination, meeting at midline at 130 o angle; mid-dorsal length essentially restricted to width of anterior margin. Preanal appendages with inner margin convex on distal half; outer margin nearly straight; divergent from body axis at 30 o angle, with tip swollen and pointed. Segment X with lateral margins of ventral arms smoothly concave, convergent from bases of preanal appendages to contact each other near mid-length, then divergent distally to tips of outer denticles. Median margins of ventral arms parallel to lateral margins except slightly swollen in contact area; X sclerotized dorsally from base to junction of ventral arms; V-shaped membranous area distal to junction; median denticles extend farther posteriad than lateral denticles. Darkened pair of denticles on inferior appendage (not shown) prominent, transverse.

Ventral view ( Fig. 22c ). Anterior margin of IX with deep, bluntly V-shaped concavity; posterior margin forming 100 o angle between inferior appendage bases; triangular area on posterior 1/4 depigmented posterior to transverse row of setae. Inferior appendages with lateral margin straight to slightly convex distal to swollen base; inner margins in contact at base, then diverging from each other at 20 o as a thin, broad, straight-edged shelf that angles outward (45 o from body axis) at 2/3 length of inferior appendage to base of dark, transverse, ventral denticle; a smaller dark transverse denticle posteriodorsal to larger denticle; inner margin continues to tip of inferior appendage, where non-darkened tiny denticle is not obvious.

Larva. Head, thoracic sclerites, and sclerites on IX and X dark gray; legs and prosternal sclerites dusky yellow. Head with circular pale area around eyespot. Prosternum with inner and outer margins of equal length. No muscle scars visible on larvae. In shed sclerites of MMT, small, pale muscle scars visible behind eye from lower level of eye to vertex, and behind pair of poorly defined pale spots at middle of frontoclypeus; each of these pale spots midway between outer edge and middle of sclerite. Pronotum with numerous larger pale muscle scars on posterior 2/3.

Emergence dates. 25 May-24 August.

Distribution. AL Cleburne. CT Middlesex. GA Fannin, Gilmer (2). ME Aroostook. MS Hampshire (4). NB Anagans. NC Buncombe (2), Cherokee (4), Clay (2), Graham (2), Haywood (5), Jackson, Macon (3), Swain (18), Transylvania (11). NH Carroll (2), Coos (2), Grafton, Hillsborough, Strafford (2), Sullivan, Worcester. NY Franklin. PQ Covey Hill, Knowlton, St-Fuylgence, Route 33 to Rv. Montmorency. PA Carbon, Franklin, McKean, Monroe, Pike (3), Warren (3), Wayne. TN Blount, Sevier. VA Grayson, Rappahannock. VT Windsor.

Figures

Figure 22-24. Agapetus spp. male genitalia. 22) Agapetus pinatus Ross. 22a, lateral view; 22b, dorsal view; inferior appendages not shown; 22c, ventral view of IX and inferior appendages. 23) Agapetus ruiteri Parker, Etnier, and Baxter. 23a, lateral view; 23b, dorsal view; 23c, ventral view of IX and inferior appendages. 24). Agapetus spinosusEtnier and Way. 24a, lateralview; 24b, dorsal view; 24c, ventral view of IX and inferior appendages.