Leptusa (Dysleptusa) pusio (Casey, 1906)

(Figs. 1 g, 8a – l, Map 1)

Ulitusa pusio Casey, 1906: 348 .

Leptusa pusio: Fenyes, 1920: 123; Bernhauer & Scheerpeltz, 1926: 556; Pace, 1989: 107; Gusarov, 2003: 115; Klimaszewski et al., 2004: 9.

Material examined (n=27). U.S.A.: Tennessee: Sevier Co.: 5ɗɗ, 7ΨΨ (Ψ slide mounted), GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 5 April 2007, SP2 Litter 2 of 3, M. Ferro (GSMNP); ɗ, 2ΨΨ (ɗ slide mounted), GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 12 April – 18 May 2006, SP25C -CWD Rear 1, M. Ferro (LSAM); ɗ, GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 5 October 2006, SP2 Litter 1 of 3, M. Gimmel (LSAM); ɗ, GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 12 April – 18 May 2007, SP23B -CWD Rear 1, M. Ferro (LSAM); ɗ, GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 4 October 2006 – 1 April 2007, SP21B -CWD Rear 1, M. Ferro (LSAM); ɗ, GSMNP, Sugarlands Quiet Walkway, N35°39.826’ W83°31.509’, 16 April–18 May 2006, SN32B -CWD Rear 1, M. Ferro (LSAM); Ψ, GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 5 October 2006, SP2 Litter 2 of 3, M. Gimmel (LSAM); Ψ, GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 18 May – 24 June 2006, SP24A -CWD Rear 1, M. Ferro (LSAM); Ψ, GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 4 October 2006 – 1 April 2007, SP24A -CWD Rear 1, M. Ferro (LSAM); Ψ, GSMNP, Porters Creek, N35°40.790’ W83°23.855’, 18 May – 24 June 2006, SP24C -CWD Rear 1, M. Ferro (LSAM); Ψ, GSMNP, Greenbrier, N35°43.147’ W83°23.349’, 4 October 2006 – 1 April 2007, SP13A -CWD Rear 1, M. Ferro (LSAM).

Redescription. Length 1.9 – 2.2 mm. Body brown, glossy; head and abdominal tergite VI blackish brown; antennomeres 1 – 3, mouthparts and legs somewhat brighter (Fig. 1 g). Head as wide as pronotum, with large setigerous punctures (distance between punctures more than their diameter) present. Antennomeres 1 – 3 elongate, 4 subquadrate, 5 – 10 transverse (Fig. 8 a). Carina on each side of ventral surface of head complete, attaining gular suture.

Mouthparts. Labrum transverse, bearing 3 pairs of short setae, and 7 pairs of long setae, a-seta, b-seta, and pores (Fig. 8 b). Labium bearing two distal setae in a longitudinal row in median area; a pair of setal pores, 2 pairs of real pores and several pseudopores present in lateral area (Fig. 8 c). Labial palpi bearing 12 setae (a – h, α – δ), γ-seta at least three times longer than α-, β-, δ-seta (Fig. 8 d). Mentum trapezoidal, bearing 4 pairs of main setae (b, u, v, w), a pair of additional setae, and many pores (Fig. 8 e).

Thorax. Pronotum approximately 1.32 times wider than long, with large setigerous punctures (distance between punctures more than their diameter) present. Mesoventrite with distinct reticulate microsculpture; incompletely carinate, carina extending approximately 1/3 length of mesoventrite. Metaventrite with large setigerous punctures present. Elytra wider than pronotum, approximately 1.46 times longer than wide, approximately 1.35 times longer than pronotum, latero-posterior margin emarginate, with large setigerous punctures (distance between punctures more than their diameter) present. Hind wings present.

Abdomen. Abdomen wider than elytra, widest at abdominal tergites VI – VII. Abdominal tergite VI approximately 2.1 times wider than long. Male abdominal tergites VII – VIII with single median elongate tubercle (Fig. 8 f); tergite VIII bearing 4 pairs of main setae, many additional short setae and pores; posterior margin with several tubercles, and emarginate (Fig. 8 f). Male abdominal sternite VII with many pores in anterior one-fourth; sternite VIII with posterior margin produced, bearing 9 pairs of main setae, and many additional short setae and pores (Fig. 8 g). Female abdominal tergite VIII with posterior margin shallowly emarginate, bearing 4 pairs of main setae, and many additional short setae and pores (Fig. 8 h). Female abdominal sternite VIII with posterior margin rounded, bearing 5 pairs of main setae, and many additional short setae and pores (Fig. 8 i).

Genitalia. Paramere as in Fig. 8 j. Median lobe as in Fig. 8 k. Spermatheca as in Fig. 8 l.

Type locality. Ohio (Cincinnati).

Distribution. USA: Ohio, Tennessee. Locations where L. (D.) pusio has been collected in GSMNP as in Map 1.

Habitat. Specimens examined were collected from primary and secondary forest in GSMNP. Specimens were collected by sifting leaf litter and emergent from CWD decay classes I through III – IV.

Comments. Our conclusion that these specimens are conspecific with L. pusio is based on comparison with the genitalia, as illustrated by Gusarov (2003: figs 157-160). He designated the lectotype of this species, and the illustrations were drawn using the paralectotype.