Cybaeina minuta Chamberlin and Ivie 1932
Creators: name: Bennett, Robb
name: Copley, Claudia
name: Copley, Darren
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Cybaeidae
Cybaeina
Cybaeina minuta

description: Cybaeina minuta (Banks)
Figs 1, 6–7, 12–13, 16–17, 22–24, 28
Cybaeus minutus Banks 1906: 95.
Cybaeina minuta Chamberlin and Ivie 1932: 28, figs 5–14, 28–30. Exline 1938: 8. Roewer 1954: 86. Bonnet 1956: 1296. Roth and Brown 1986: 2. Bennett 2005: 88, figs 22.20, 22.25, 22.28–22.29, 22.31, 22.34. Bennett 2017: 99, figs 23.20, 23.25, 23.28–23.29, 23.31, 23.34. World Spider Catalog 2023.
Type material examined. U.S.A.: Washington: Holotype female. Thurston County, Olympia, no date, no collector (MCZ).
Other material examined. CAN: British Columbia: 1♀, Brooks Peninsula, shoreline moss, 50.203°N 127.631°W, 28.ix.2006, C. Copley & D. Copley (RBCM); 2♀, Kyuquot, 1–10.ix.1930, S.L. Neave (AMNH); 1♀, Kyuquot, 1.vi.1952, S.L. Neave (CNC); 1♁ 2♀, Kyuquot, Clanninick Grass Flats, 3.vii.1956, S.L. Neave (AMNH); 1♀, Kyuquot, Meyer’s Cove, 11.iv.1959, S.L. Neave (AMNH); 1♀, Kyuquot, Neave’s Is., 29.x.1958, S.L. Neave (RBCM); 1♁, Kyuquot, Union Is., 25.ix.1959, S.L. Neave (AMNH); 1♀, Kyuquot, Walter’s Cove, 24.iv.1959, S.L. Neave (AMNH); 1♀, Tofino, 28.vii.1966, E. Thorne (CNC); 1♀, Victoria, 10.viii.1930, S.L. Neave (CNC). U.S.A.: Oregon: Tillamook, 1♁, Bay City, 6.viii.1929, R.V. Chamberlin (AMNH). Washington: Thurston, 1♁, Olympia, 1.xii.1933, H. Exline (CAS); 1♀, Olympia, 22.viii.1955, V.D. Roth (CAS).
Other material not examined. U.S.A.: Washington: Thurston, 1♁, Evergreen State College, 160′, 47.074°N 122.98°W, ix–x.1992, Evergreen Biodiversity Class (UWBM); Wahkiakum, 1♀, Grays River Valley, 150′, 46.361°N 123.574°W, 27–28.x.1984, R. Crawford (UWBM); 1♀, Hendrickson Canyon, 50–150’, 46.367°N 123.666°W, 26.x.1984, R. Crawford (UWBM).
Diagnosis. The differentiation of specimens of C. minuta from those of C. confusa and C. dixoni spec. nov. is discussed in the diagnoses of the latter two species.
Description. As in diagnosis and description of the genus and the diagnoses of C. confusa and C. dixoni spec. nov. Additional descriptive characters presented here.
Male (n=4): Tegular apophysis (Figs 6–7) with narrow base; distal arm with narrow prolaterad tip, distoretrolateral edge folded over ventrally; proximal arm with simple, elongate, sinuous, proximo-prolaterad tip.
Measurements (n=4). CL 2.08–2.23 (2.16), CW 1.68–1.75 (1.70), SL 1.13–1.17 (1.15), SW 1.03–1.08 (1.06).
Female (n=13): Atrium (Fig. 22) on posterior edge of epigyne. Vulva (Figs 23–24) with copulatory ducts contiguous only at atrium; spermathecal heads undifferentiated from spermathecal stalks except for presence of primary pores; primary pores dorsal, inconspicuous; spermathecal stalks elongate, convoluted, well sclerotized; spermathecal bases rounded, relatively small (about 1/3 length of vulva); fertilization ducts slender.
Measurements (n=12). CL 1.78–2.13 (1.99+0.11), CW 1.30–1.58 (1.46+0.09), SL 0.98–1.12 (1.07+0.05), SW 0.94–1.04 (1.00+0.04). Holotype CL 2.1, CW 1.55, SL 1.08, SW 1.04.
Distribution and natural history. (Fig. 28). Cybaeina minuta is relatively widespread but rarely encountered in the coastal western Nearctic area where it has been recorded from the northwest coast of Vancouver Island, British Columbia, Canada, south to coastal northwestern Oregon, U.S.A. Males have been collected from early July to early December. The most recent known record for C. minuta is from 2006. This species is ranked nationally vulnerable in Canada (Canadian Endangered Species Conservation Council 2022); a conservation rank for this species in the U.S.A. has not been determined.
description: Published as part of Bennett, Robb, Copley, Claudia & Copley, Darren, 2023, Revision of the western Nearctic spider genus Cybaeina including the description of Neocybaeina gen. nov. and Rothaeina gen. nov. (Araneae: Cybaeidae: Cybaeinae), pp. 97-129 in Zootaxa 5318 (1) on pages 103-105, DOI: 10.11646/zootaxa.5318.1.5, http://zenodo.org/record/8158357