Perlesta xube Stark & Rhodes 1997

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

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Perlesta xube Stark & Rhodes 1997


Perlesta xube Stark & Rhodes 1997 

Pawnee Stone Plecoptera

( Figs. 2 View Figure & 11 View Figure )

Perlesta xube Stark & Rhodes 1997:92  . Holotype ♂ ( USNMAbout USNM), Dry Creek, Merriman , Cherry Co., Nebraska. 

Perlesta xube: Stark 2004:95 

Distribution. USA: IA, IL, ND, NE, OH ( DeWalt et al. 2018), IN (new state record)

Remarks. The head masks of males and females of P. xube  ( Figs. 2a‒2e View Figure ) are readily distinguished from P. armitagei  sp. nov. ( Figs. 6a‒6h View Figure ) and P. cinctipes  ( Figs. 5a‒5d View Figure ). The specimens (all males) determined as P. cinctipes in Stark (2004)  were not of P. armitagei  sp. nov. but of P. xube  . Males of P. xube  and P. cinctipes  key to couplet 6 in Stark (2004). This couplet focuses on whether the dorsal patch is “wider at apex than at base” ( P. xube, Stark 2004  , his Fig. 7.370‒7.371) or “narrow throughout most of length” ( P. cinctipes, Stark 2004  , his Fig. 7.300). Perlesta cinctipes  is one of few Perlesta  species where the fully-extruded male aedeagus has yet to be illustrated with a line drawing or SEM. The length of the sac is not fully understood, whether in relation to the length of the tube or length and shape of the caecum. An additional aedeagal characteristic is useful in differentiating between these two species. The dorsal patch of P. xube  is expanded at the base and body of the caecum but not apically ( Stark & Rhodes 1997, their Fig. 6 View Figure ; Stark 2004, his Figs. 7.370‒7.371). The dorsal patch of P. cinctipes  , however, expands well onto the caecum ( Stark 2004, his Fig. 7.299).

Females of P. xube  can be easily differentiated from P. cinctipes  using Stark (2004) and from P. armitagei  sp. nov. here with subgenital plate characteristics. Eggs of P. xube  ( Stark & Rhodes 1997, their Fig. 8 View Figure , Stark 2004, his Fig. 7.404) are also distinct from both P. cinctipes  ( Stark 1989, his Fig. 17, Stark 2004, his Fig. 7.394‒7.395) and P. armitagei  sp. nov. ( Figs. 10a‒10d View Figure ).

Perlesta xube  overlaps in distribution with P. armitagei  sp. nov. from southern Indiana east to Ohio and with P. cinctipes  to date only in southern Iowa ( Figs. 11a‒11b View Figure ).


Smithsonian Institution, National Museum of Natural History














Perlesta xube Stark & Rhodes 1997

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


Perlesta xube

: 92


Perlesta xube

: 95