Setodes chipolanus Rasmussen and Harris

Rasmussen, Andrew K., Harris, Steven C. & Denson, Dana R., 2008, Two new species of Leptoceridae (Trichoptera) from Florida, USA, Zootaxa 1779, pp. 55-64 : 58-61

Setodes chipolanus Rasmussen and Harris , new species

Figs. 2–3

Setodes n. sp., Pescador et al. 1995: 74, 131. Setodes n. sp., Pescador et al. 2004: 80, 135.

The male of S. chipolanus n. sp. most closely resembles the southeastern S. dixiensis and the Ozark endemic, S. oxapius . In all three species the intermediate appendages are shorter than the preanal appendages. From both of these species, S. chipolanus n. sp. is separated by the shape of the intermediate appendages. These structures are much narrower in dorsal aspect than those of S. dixiensis , and both longer and more apically divided than those of S. oxapius ; in lateral view the intermediate appendages taper postero-ventrally in the new species, unlike the rounded apices of the other two species. The female of S. chipolanus n. sp. most closely resembles that of S. incertus and S. stehri . In all three species, tergum X is deeply emarginate. A distinctive feature of S. chipolanus n. sp. is the lobate postero-lateral margins of segment IX.

Using the key presented in Holzenthal (1982), males of S. chipolanus n. sp. will run to couplet 6 and females will key to S. stehri in couplet 11. The new species is incorporated into the key with the following modifications.

6. Intermediate appendages broadly triangular in dorsal view ( Holzenthal, 1982, Fig. 7); inferior appendages with bare, mid-ventral acute projection ( Holzenthal, 1982, Fig 7) ................. Setodes dixiensis Holzenthal - Intermediate appendages narrow in dorsal view ( Holzenthal, 1982, Fig. 16; Fig. 2 ); inferior appendages with or without bare, mid-ventral acute projection ( Holzenthal, 1982, Fig. 16; Fig. 2 ) .......................... 6’ 6’. Intermediate appendages very short, bullet-shaped in lateral view, with shallow apical incision in dorsal view ( Holzenthal, 1982, Fig 16); inferior appendages without bare, mid-ventral acute projection ( Holzenthal, 1982, Fig 16) ...................................................................................... Setodes oxapius (Ross) - Intermediate appendages longer, hatchet-shaped in lateral view, with deep apical incision in dorsal view ( Fig. 2 ); inferior appendages with bare, mid-ventral acute projection ( Fig. 2 ) .... Setodes chipolanus n. sp. 11. Segment IX postero-lateral margins lobate ( Fig. 3 ) .............................................. Setodes chipolanus n. sp. - Segment IX postero-lateral margins not lobate ( Holzenthal, 1982, Figs. 13, 19) ................................... 11’ 11’ Tergum X and valves subtended at base by a pair of prominent, raised apico-lateral projections (ap. proj.) of tergum IX ( Holzenthal, 1982, Fig. 13) ............................................................ Setodes incertus (Walker) - Tergum IX not forming a pair of prominent, raised apico-lateral projections ( Holzenthal, 1982, Fig. 19) .. ..................................................................................................................................... Setodes stehri (Ross)

Adult. Body length: male 3.4–4.3 mm, female 3.7–4.6 mm. In alcohol, body generally straw-colored, head with lateral margins brownish, thorax darker brown laterally and dorsally with pale medial stripe, legs light brown, wings straw-colored with mottled appearance, terminal abdominal segments dark brown.

Male. Genitalia as in Fig. 2 . Segment VIII annular. Segment IX heavily sclerotized, broad ventrally, narrow dorsally and fused with segment X. Tergum X divided into four processes, one elongate pair of lyrate preanal appendages covered with short appressed setae and serrate on outer margins and one pair of short intermediate appendages; intermediate appendages rectanguloid in dorsal view, incised distally; in lateral view hatchet-shaped. Inferior appendages thin and elongate, straight along mid-length; in lateral view wide basally with ovate protuberance, mesally with large claw-shaped, bare mid-ventral acute projection; in ventral view, bases plate-like and fused, falcate and narrow distally, curving inward apically, bearing elongate setae on inner surface. Phallus tubular; in lateral view duck-head shaped apically, bearing pair of elongate lateral parameres bent downward at tip; ventrally pair of sclerotized processes that connect phallus to inferior appendages; in ventral view phallus apex widening and incised, basally wide with processes extending mesally.

Female. Genitalia as in Fig. 3 . Segment IX tubular, elongate, postero-ventral corners broadly rounded. Segment X tapering posteriorly in lateral aspect; in dorsal view rectanguloid, wide incision posteriorly. Valves in lateral view large and trianguloid; in ventral view rectanguloid, angled inward distally and bearing numerous setae on lateral margins. Vaginal apparatus ovoid in ventral view, posteriorly with wing-like lateral processes, pair of narrow elongate processes anteriorly.

Holotype male ( NMNH). Florida: Calhoun County: Chipola River @ Hwy 274 bridge, 18 May 1994, M. Pescador, W. Flowers, S. Harris.

Paratypes. Same data as holotype, 25 males, 7 females ( NMNH), 25 males, 7 females ( UMSP), 25 males, 7 females ( INHS), 25 males, 7 females ( CUAC), 25 males, 7 females ( FAMU); same except, 4 May 1995, M. Pescador, A. Rasmussen, 4 males ( FAMU); Chipola River @ Hwy 20 bridge, 27 September 1972, P. Carlson, 1 female ( FAMU); Jackson County: Rocky Creek @ Hwy 71 bridge, 18 May 1994, M. Pescador, W. Flowers, S. Harris, 25 males, 10 females ( NMNH), 25 males, 10 females ( UMSP), 25 males, 10 females ( INHS), 25 males, 10 females ( CUAC), 25 males, 10 females ( FAMU); Chipola River @ SR-167 near Marianna, 4 October 2006, D. Denson, 45 males, 5 females ( FAMU).

Eytmology. Named for the Chipola River drainage where the species was collected.

Figures

FIGURE 2. Setodes chipolanus, new species. Male genitalia: A, lateral; B, dorsal; C, ventral; D, phallus, lateral; E. phallus, ventral. Abbreviations: a. p. = bare acute mid-ventral projection of inferior appendage; inf. = inferior appendage; int. = intermediate appendage; par. = paramere; pr. = preanal appendage.

FIGURE 3. Setodes chipolanus, new species. Female genitalia: A, lateral; B, dorsal; C, ventral; D, vaginal apparatus, ventral. Abbreviations: v. = valve.