Perlesta browni Stark, 1989

Grubbs, Scott A. & Dewalt, R. Edward, 2018, Perlesta armitagei n. sp. (Plecoptera: Perlidae): More cryptic diversity in darkly pigmented Perlesta from the eastern Nearctic, Zootaxa 4442 (1), pp. 83-100: 86-87

publication ID

https://doi.org/10.11646/zootaxa.4442.1.4

publication LSID

lsid:zoobank.org:pub:937D9736-2646-45D6-8C5D-3625A88FF2FB

persistent identifier

http://treatment.plazi.org/id/451FB544-C53B-AA77-FF6E-FBA655C02609

treatment provided by

Plazi

scientific name

Perlesta browni Stark, 1989
status

 

Perlesta browni Stark, 1989 

Toothed Stone

http://lsid.speciesfile.org/urn:lsid: Plecoptera  .speciesfile.org:TaxonName:1237

( Figs. 3‒4View FIGURE 3View FIGURE 4 & 11 View Figure )

Perlesta browni Stark 1989:279  . Holotype ♂ ( USNMAbout USNM), Rock Creek , Latimer Co., Oklahoma. 

Perlesta browni: Poulton & Stewart 1991:39 

Perlesta browni: Stark 2004:91 

Perlesta browni: Kondratieff et al. 2011:300 

Distribution. USA: AR, MO, OK, VA ( DeWalt et al. 2018)

Remarks. Adults of P. browni  display golden-brown background color with darker pigmentation on the head, thorax ( Figs. 3a‒3d View Figure ), and abdomen. Whereas the abdominal terga for females are nearly uniform in color throughout their length, by comparison male terga 6‒10 are markedly darker than the anterior five segments. The posterolateral corners of the male 9th sternum are clothed by a dense matting of long hairs, noticeably longer and denser than the anterolateral and medial portions of the segment ( Fig. 4d View Figure ). Males have long, slender, tubular paraprocts with a mesoapical tooth ( Figs. 4a‒4c View Figure ) that are similar to sympatric P. cinctipes  ( Figs. 5e‒5f View Figure ) but longer than those of P. armitagei  sp. nov. ( Figs. 7a, 7c View Figure ). In addition, Poulton & Stewart (1991) showed that P. browni  femora are pigmented only in the distal third, the brown color extending to the articulation with the tibia (their Fig. 344). Conversely, P. cinctipes  femora are pigmented in approximately the middle 40%, the articulations with the coxae and tibiae are unpigmented ( Poulton & Stewart 1991, their Fig. 342).

Females can be separated by characteristics of their subgenital plate lobes and median notch ( Stark 2004). The eggs of P. browni  are easily differentiated from P. cinctipes  . The egg of P. browni  has a short, slightly distallyflanged ribbed collar and the chorionic surface is covered by fine punctations except near the eclosion line ( Figs. 4e‒4f View Figure ; Stark 1989, his Fig. 15). The egg of P. cinctipes  has a similar collar but the chorionic surface is coarsely pitted except for the smooth eclosion line region ( Stark 1989, his Fig. 17; Stark 2004, his Figs. 7.394‒7.396).

Perlesta browni  was considered endemic to the Interior Highland region ( Fig. 11a View Figure ; Poulton & Stewart 1991, Stark 2004) until specimens seemingly indistinguishable from this species were reported from a single locality in eastern Virginia (Kondratieff et al. 2011). Perlesta browni  is sympatric with P. cinctipes  mainly in the Ouachita Mountain region of western Arkansas and eastern Oklahoma ( Fig. 11a View Figure ).

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Perlidae

Genus

Perlesta

Loc

Perlesta browni Stark, 1989

Grubbs, Scott A. & Dewalt, R. Edward 2018

2018
Loc

Perlesta browni

: 279

Loc

Perlesta browni:

: 39

Loc

Perlesta browni:

: 91