Perlesta adena Stark, 1989

Stark, Bill P. & Harrison, Audrey B., 2019, The Larva Of Perlesta Adena Stark, 1989 (Plecoptera: Perlidae), Illiesia 15 (4), pp. 79-82 : 80-81

Perlesta adena Stark, 1989

http://lsid.speciesfile.org/urn:lsid:Plecoptera.speciesfile.org: TaxonName:1240

( Figs. 1-3 )

Perlesta adena Stark, 1989:277 .

Holotype ♂ (USNM), Stillwater River , Hwy 185, Miami Co., Ohio

Perlesta adena: Stark, 2004:90 .

Perlesta adena: Grubbs & DeWalt, 2018:84 .

Material examined: OHIO: Ross Co., Ralston Run, Paint Creek Rd, Ralston , near jct Blain Highway , 23 May 1999, B. Stark, R.F. Kirchner, 9♂, 7♀, 1 larva ( BPSC) . TENNESSEE: Trousdale Co., Browning Branch, Hwy 260, 36.42695, -86.20354, 20 May 2019, B. Stark, A.B. Harrison, 1♂, 2♀ ( BPSC) , 1♂, 1♀, 4 exuviae ( ABHC) . Hawkins Branch, Hawkins Branch Rd , 36.44923, -86.20828, 20 May 2019, 3♂, 3♀, 3 exuviae ( ABHC) , 3♂, 1♀, 1 larva ( BPSC) . Rocky Crk tributary, Hwy 35, “Philippi Church”, 36.39043, -86.25434, 11 May 2000, R.F. Kirchner, B.C. Kondratieff, 55♂, 10♀, 1 larva ( CSUIC) . Same site, 25 May 1999, B. Stark, 1♀ ( BPSC) . Same site, 19 May 2019, B. Stark, A.B. Harrison, 1♂ ( ABHC) , 1 larva, 1 exuvia ( BPSC) .

Adult habitus: Male and female terminalia, and egg described by Stark (1989, 2004). Additional details were provided by Grubbs & DeWalt (2018).

Larva: Body length approximately 10 mm (n = 4). Head with extensive dark brown pigment at least partially covering occiput and frons ( Figs. 1-2 ). Pale M-line distinct forward of median ocellus; four small, oval pale spots on frons, two forward and two posterior of M-line. Antennal scape dark brown, pedicel and flagellum pale brown. Clypeus and median field of labrum pale, and a slanted pale band extends along suture posterior to lateral ocelli and anterior to occiput and compound eye. Lacinia typical of genus with two moderately strong dark setae near base of secondary tooth, and several (~5-7) smaller pale setae along inner lacinial margin ( Fig. 3 ). Row of occipital spinules obscure due to dark pigment ( Fig. 2 ). Pronotum with extensive pigmentation consisting of a broad, dark median stripe with pale center, a broad pale band present laterally, and dark rugosities numerous on pale background ( Figs. 1-2 ). Legs pale without distinctive pigment pattern ( Fig. 1 ). Abdomen brown with a pair of small pale median spots on terga 2-8; a single large pale brown spot surrounds paired spots on terga forming a longitudinal pale stripe on abdomen ( Fig. 1 ). Abdominal terga 2-10 bear several scattered, robust socketed intercalary setae. Cerci pale brown.

Comments: Among species known in the larval stage, larvae of P. adena are most similar to those of P. fusca Poulton & Stewart, 1991 , and to the unidentified specimen in Stewart & Stark (2002) illustrated in fig. 13.27. The head patterns of these species share a pale M-line anterior to the median ocellus, four pale oval spots on the frons, a pale straight band on the clypeus and a pair of moderately sized reticulate oval areas adjacent to the compound eyes. In addition, the median pronotal bands for these species are virtually indistinguishable ( Poulton & Stewart 1991). The larvae of P. adena are also relatively similar to those of P. baumanni Stark, 1989 , and P. xube Stark & Rhodes, 1997 .

Figures

Fig. 1. Perlesta adena. Larval habitus, dorsal.

Figs. 2-3. Perlesta adena larval structures. 2. Head and pronotum, dorsal. 3. Maxilla.