Stonefly Species Perlesta adena (Golden Stones)

Source: The Larva Of Perlesta Adena Stark, 1989 (Plecoptera: Perlidae)

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.

Source: Perlesta armitagei n. sp. (Plecoptera: Perlidae): More cryptic diversity in darkly pigmented Perlesta from the eastern Nearctic

http: // lsid. speciesfile. org / urn: lsid: Plecoptera. speciesfile. org: TaxonName: 1240 (Figs. 1 & 11)