Neotrichia riegeli Ross

Harris, Steven C. & Rasmussen, Andrew K., 2010, The Neotrichia caxima Group (Trichoptera: Hydroptilidae) in the southeastern United States, Zootaxa 2608, pp. 25-44 : 29-30

Neotrichia riegeli Ross

( Figs 5 , 6 )

Ross (1941): 61, 3,Ƥ

Neotrichia riegeli was originally described from Illinois by Ross (1941) and has a general southcentral distribution (Keth 2002). The specimens labeled as Neotrichia sp. nr. riegeli in Abbott et al (1997) were examined and found to be N. armitagei . The male of N. riegeli is separated on the basis of the inferior appendages, which are cubical in ventral view. The female of N. riegeli was also described in Ross (1941), but is redescribed below in the context of the other southeastern species of the group.

Redescription of female. Length 2–2.5 mm. 18 antennal segments, brown in alcohol. Abdominal segments VII – X typical for genus, sternum segment VIII with crescent-shaped mesal sclerite ( Fig. 6 A). Bursa copulatrix as in Fig. 6 B with posterior copulatory channel about ¾ length of genital chamber, this chamber with sclerotized lateral bands extending anteriorly as elongate processes, bell-shaped mesal sclerite elongate anteriorly.

As with N. alabamensis , N. riegeli is identified by the crescent-shaped, sternal sclerite on segment VIII. However, in N. riegeli the sclerite is entire mesally.

Material examined. Illinois, Pope County, Eddyville, Lusk Creek, 19-20 June 1940, Mohr/Riegel, 63, 90Ƥ.

Distribution. AR, IL, KY, OK.

Figures

FIGURE 5. Neotrichia riegeli, male genitalia. A. Left lateral view, B. Ventral view, C. Dorsal view, D. Phallus, left lateral view.

FIGURE 6. Neotrichia riegeli, female genitalia. A. Abdominal segment VIII, ventral view, B. Bursa copulatrix, ventral view.