Ostrocerca Ricker 1952
Creators: name: Grubbs, Scott A.
name: Baumann, Richard W.
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Nemouridae
Ostrocerca

description: III. Genus Ostrocerca Ricker, 1952
http://lsid.speciesfile.org/urn:lsid: Plecoptera.speciesfile.org:TaxonName:6133
Type species. Nemoura foesteri Ricker, 1943
Range. Nearctic (DeWalt et al. 2022).
Diagnosis. See Baumann (1975) for a comprehensive description of the genus and Young et al. (1989) for an SEM-based treatment for all six Nearctic species.
Species key to eastern Nearctic Ostrocerca adult males and females
1 Males .............................................................................................. 2
- Females............................................................................................. 5
2 Epiproct ventral sclerite apex a singular unit apically and expanded laterally (Figs. 20, 38)........................... 3
- Epiproct ventral sclerite apex sclerite secondarily divided apically into pair dorsal processes and a singular ventral process (Figs. 26‒27, 32‒33)................................................................................... 4
3 Epiproct with a T-shaped ventral sclerite apically (Fig. 21), dorsal sclerite with recurved, paired lateral arms visible in dorsal view (Figs. 20‒22)......................................................................... O. albidipennis
- Epiproct with a bell-shaped ventral sclerite apically (Figs. 37‒38), dorsal sclerite with paired lateral arms not recurved and visible in ventral view (Figs. 39‒40).............................................................. O. truncata
4 Epiproct ventral sclerite terminating in paired processes apically, not recurved and in similar dorsal plane as singular process (Figs. 26‒27)................................................................................ O. complexa
- Epiproct ventral sclerite terminating in paired, dorsally-recurved processes apically, singular process ventrally displaced (Figs. 32‒33).................................................................................... O. prolongata
5 7 th sternum not produced and extended over 8 th sternum, subgenital plate of 8 th sternum with subtriangular lateral projections and medially truncate (Figs. 41‒42)............................................................... O. truncata
- 7 th sternum produced over anterior margin of 8 th sternum as a nipple-like process, subgenital plate of 8 th sternum with gently rounded or subangular lateral corners and medially concave (Figs. 23‒24, 29‒30, 35‒36)............................ 6
6 7 th sternum slightly produced over anterior margin 8 th sternum, subgenital plate of 8 th sternum with gently rounded lateral corners and concave in medial ⅓ (Figs. 23‒24)................................................... O. albidipennis
- 7 th sternum produced at least ¼ of anterior margin 8 th sternum, subgenital plate of 8 th sternum with subangular lateral corners and concave in medial ½ (Figs. 29‒30, 35‒36)..................................... O. complexa and O. prolongata
description: Published as part of Grubbs, Scott A. & Baumann, Richard W., 2023, The Nemourinae (Insecta, Nemouridae) of the eastern Nearctic, pp. 1-53 in Zootaxa 5306 (1) on pages 9-10, DOI: 10.11646/zootaxa.5306.1.1, http://zenodo.org/record/8054287