Agapetus pegram Etnier, Baxter, and Parker, 2010

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 : 33-35

Agapetus pegram Etnier, Baxter, and Parker new species

Fig. 21a, 21b, 21c . Map 21

Type material. Holotype, MMT male, length 4.3 mm, EX UT 1.362 . Cave Spring , Pegram, 36.1070 o N, 87.0462 o W, Cheatham Co., TN, 27 March 1998, emerged 19 April, D.A. Etnier, C.J. Paxton, C.E. Skelton. ( NMNH)

Allotype, MMT mature female pupa, taken with holotype, emerged 17 April 1998. ( NMNH)

Paratypes taken with the holotype, EX UT 1.362 . CASC, MMT male pupa emerged 9 April, 1 prepupa ; CUAC, MMT male pupa emerged 26 April, 1 prepupa; INHS, MMT male pupa emerged 27 April, MMT female pupa emerged 17 April, 1 prepupa; ROME, MMT male emerged 20 April, 1 prepupa; SCHC, MMT male pupa emerged 19 April, 1 prepupa; NMNH, 1 larva, 1 prepupa. 2 MMT male pupae, 1 female, 2 early pupae, and 6 prepupae remain in UT 1.362 .

Additional paratopotypes, 5 April 1997, EX UT 1.330 . CASC, 1 MMT female pupa ; CUAC, 1 MMT female pupa; ROME, 1 female, emerged 27 April ; SCHC, 1 MMT female pupa, emerged 17 April; UMSP, 1 MMT male pupa, 1 MMT female pupa, l prepupa, 1 larva. Nine MMT male pupae, 2 MMT female pupae, 1 early pupa, and 5 larvae /prepupae remain in UT 1.330 .

Additional material examined. Tennessee, Cheatham Co.: UT 1.568 , spring run in northeast corner of jct. US 70 and TN 249 , Pegram, 29 March 2000, 10 larvae /prepupae, 1 early pupa, 9 male + 5 female mature pupae/adults ; UT 1.570 , creek along TN 251 at Christ Community Church, 0.4 rd mi n of Glower Road, n of I-40, 29 March 1990, 7 larvae /prepupae, 8 male + 7 female mature pupae/adults ; UT 1.572 , type locality, 29 March 2000, 7 larvae /prepupae, 13 male + 14 female mature pupae/adults. Davidson Co.: UT 1.798 , Little Cr. at Little Cr. Community Club, about 0.5 mi e of I-24 on TN 45 , 17 April 2002, 6 larvae /prepupae, 2 male mature pupae/adults ; UT 1.799 , Little Cr. at Pioneer Christian Academy, dead end of Brick Church Road, e of I-24, 17 April 2002, 5 larvae /prepupae, 3 male + 5 female mature pupae/ adults ; UT 1.800 , creek at Crocker Spring Road 0.2 rd mi above Lickton Road, e of I-24, 17 April 2002, 3 prepupae, 5 male + 3 female mature pupae/adults. Williamson Co.: UT 1.1113 , Basin Spring , 35.9582 o N, 87.0387 o W, 9.5 air mi wnw of jct. US 31 and US 431 in Franklin, 4 May 2008, 1 male ; UT 1.1193 , same locality, 28 April 2008, 1 MMT male pupa, 1 MMT female pupa .

Diagnosis. Differs from all species treated herein except A. stylifer in having posteriodorsal and posterioventral corners of segment X well sclerotized, curved outward, and ending in a sharp point. Very similar to and probably closely related to A. stylifer , from which it differs most notably in having the posteriodorsal corner of X (lateral view) blunt, conspicuously darkened apically, and with only a shallow notch between it and the rounded posterioventral corner of X (tapering to a sharp point, not apically darkened, and forming a deep, U-shaped emargination between it and the distinct ventral projection in A. stylifer ). In addition, in dorsal and ventral views of X both terminal denticles are bent outward at about 90 o from their base, while in A. stylifer only the ventral denticle has this configuration, with the dorsal denticle a smooth continuation of its base.

Description. Male. Length 4.3-5.3 mm (n = 5). Male genitalia: Lateral view ( Fig. 21a ), anterior margin of IX thickened, slanting down and forward to midline at 40 o angle, then nearly vertical to convex ventral margin; dorsal margin 1/3 length of ventral margin; posterior margin concave in dorsal 1/2, and nearly vertical in lower 1/2 to inferior appendage base; an elevated shoulder associated with base of preanal appendage. Preanal appendages subrectangular, length = 2.7 times maximum depth, tip bluntly rounded; dorsal margin convex with about 10 long, erect setae concentrated on distal 1/2; ventral margin concave. Segment X laterally well sclerotized, with ventral arms more opaque, darker area narrow at base and expanding distally to include terminal posteriodorsal projection and posterior 1/4 of dorsal margin. Dorsal margin depressed at base, then convex to tip of short, blunt, terminal projection. Both dorsal projection and posterioventral area with dark spot due to transverse, triangular denticle. a narrow membranous area often visible dorsal to dorsal margin of X. Ventral margin of X slightly concave near tip, its rounded termination forming a shallow notch with dorsal projection. Inferior appendages with length 2.5 times basal depth, dorsal margin slightly concave; ventral margin convex on basal 1/2, slightly concave distally and tapering smoothly to terminal, upturned denticle at bluntly pointed distal end; denticle vertical to slanting rearward at 30 o from vertical and with a darkened line (denticulate ridge) visible extending forward from its base about 1/4 length of appendage; an additional, slightly shorter, darkened denticulate ridge barely visible on ventral margin at middle of appendage.

Dorsal view ( Fig. 21b ). Anterior margin of IX broadly and deeply emarginate; posterior margin not conspicuous, with V-shaped posterior projection; mid-dorsal length 1/2 exposed length of preanal appendage. Preanal appendages divergent from body axis at 30 o, tips swollen and more divergent. Lateral margins of X gradually divergent from base to terminal pointed denticle that is directed laterad and slightly forward; inner dorsal margins not conspicuous, separated by membranous area, divergent from body axis (25 o angle) and convex to tips of dorsal denticles. Ventral arms of X with inner margins convergent to nearly meet at 1/3 length, then convex and divergent at 25 o from body axis to tip; darkened posterioventral denticle visible at 3/4 length of X. Inferior appendages (not shown) parallel sided, curved, with bases divergent; tips convergent, truncate, and slightly swollen, distal denticle not conspicuous.

Ventral view ( Fig. 21c ). Anterior margin of IX with broadly V-shaped concavity; posterior margin Vshaped (120 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 each 1/3 width of IX, outer margin convex to truncate, slightly swollen tip; terminal denticle directed inward; inner margins in contact at base, convex and divergent from each other at increasing angle from base through darkened ridge of irregular denticles in middle 1/3 of length, then curved inward and parallel with outer margin on distal 1/3. Darkened row of irregular denticles often with slightly larger proximal denticle. Ventral arms of X (not shown) convex and convergent at basal third, divergent and straight to convex in distal 2/3, sharp subterminal and terminal denticles both visible, directed anteriolaterad.

Larva. Not separable from that of A. stylifer . Head with pale muscle scars on genae in area behind eye, and on frontoclypeus as a transverse band of 3-5 on posterior 1/2 of sclerite, visible in MMT sclerites but not in intact larvae or prepupae. Head (except for pale area around eye and muscle scars) and sclerites on IX and X dark brown; pronotal, mesonotal, and metanotal sclerites lighter brown, legs yellow. Mesosternal sclerite narrowly bordered with black. Legs, sterna, and sclerites on IX and X otherwise typical for genus.

Emergence dates. 7 April-23 May.

Distribution. TN Cheatham (3), Davidson (3), Williamson.

Discussion. All noted differences between males of A. pegram and A. stylifer are based on relative length, orientation, and degree of curvature of genital structures. In examination of males of all available material of both species, we have noted neither intermediate populations nor notable variation within populations. Cave Springs, Pegram, Cheatham Co., TN, type locality for A. pegram , is a locality collected by Sidney W. Edwards in the 1960s. He recorded two species of Glossosoma from the spring run, one of which was surely Glossosoma nigrior , which is abundant there (but listed as G. americanum Banks by Edwards). Etnier et al. (1998) assumed that the second glossosomatid species in the spring run might represent G. intermedium (Klapalek) , known from as far southeast as Meade Co., north central Kentucky. We now feel it more likely that Edwards’ other Cave Springs glossosomatid (he listed only larvae and pupae) was A. pegram . Separation of Agapetus and Glossosoma larvae before Wiggins (1977) was quite subjective.

Etymology. pegram is used as a noun in apposition, in reference to the town of Pegram, very near the type locality.

Figures

Figure 19-21. Agapetus spp. male genitalia. 19) Agapetus meridionalis Etnier, Parker, and Baxter. 19a, lateral view; 19b, dorsal view, inferior appendages not shown; 19c, ventral view of IX and inferior appendages. 20) Agapetus minutus Sibley. 20a, lateral view; 20b, dorsal view; 20c, ventral view of IX and inferior appendages. 21) Agapetus pegram Etnier, Baxter and Parker. 21a, lateral view; 21b, dorsal view; inferior appendages not shown; 21c, ventral view of IX and inferior appendages.