Neocybaeina xantha (Chamberlin and Ivie), 2023

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), Zootaxa 5318 (1), pp. 97-129 : 110-111

Neocybaeina xantha (Chamberlin and Ivie) comb. nov.

Figs 18 , 29–39 , 84

Cybaeina xantha Chamberlin and Ivie 1937: 225 , fig. 65. Roewer 1954: 87. Bonnet 1956: 1296. Roth and Brown 1986: 2. World Spider Catalog 2023.

“New genus #2” Bennett 2005: 88, figs 22.37, 22.39, 22.44; Bennett 2017: 99, figs 23.37, 23.39, 22.44.

Type material examined. U.S.A.: Oregon: Holotype female. Douglas County, Comstock [approximately 32 miles south of Eugene], 9.ix.1935, R.V. Chamberlin & W. Ivie ( AMNH). Note: Epigyne and vulva of holotype have been lost.

Other material examined. U.S.A.: Oregon: Coos, 1♁, Charleston , 9.viii.1941, B. Malkin ( AMNH) ; 1♁, Camp Myrtlewood , S of Bridge, 28.vii.1954, V.D. Roth ( CAS) ; 5♁ 1♀, Camp Myrtlewood , S of Bridge, 27.vii/4. viii.1954, V.D. Roth ( CAS) ; 1♀, 3 mi. N of Bandon , 30.ix.1959, V.D. Roth ( CAS) ; Douglas , 1♁, Bogus Creek, E of Glide, 23.vii.1962, V.D. Roth ( CAS); 2♀, Comstock , 7.i.1950, V.D. Roth ( CAS) ; 1♀, 9 mi. SW of Cottage Grove , 23.viii.1959, W.J. Gertsch & V.D. Roth ( AMNH) ; 2♀, Idleyld Park , North Umpqua R., 23.viii.1959, W.J. Gertsch & V.D. Roth ( AMNH) ; 3♀, 27 mi. E of Roseburg , 26.viii.1955, V.D. Roth ( CAS) ; 7♀, 32 mi. E of Roseburg, Bogus Creek Forest Camp , 13.ix.1955, V.D. Roth & Capizzi ( CAS) ; 4♁, Susan Creek , E of Glide, 23.vii.1962, V.D. Roth ( CAS) ; Lane , 1♀, Oakridge , vi.1952, S. Mulaik & D. Mulaik ( AMNH) ; 1♁, 7 mi. S of Cottage Grove , 1/ 15. vii.1953, V.D. Roth ( CAS) ; 1♁ 1♀, 9 mi. S of Cottage Grove , 24.vii.1962, V.D. Roth ( CAS) .

Diagnosis. Distinguishing the male of N. xantha comb. nov. is discussed in the genus diagnosis. Distinguishing the female of N. xantha comb. nov. from that of N. burnetti spec. nov. is discussed in the diagnosis of N. burnetti spec. nov.

Description. As in diagnosis and description of the genus and the diagnosis of N. burnetti spec. nov. Additional descriptive characters presented here. Abdomen usually patterned (holotype unmarked), legs unbanded.

Male: (n=14). Patellar apophysis ( Figs 18 , 31–34 ) elongate, curved dorsally, with tapered tip bearing three to six peg setae. Retrolateral tibial apophysis ( Figs 31–35 ) with medial component present but greatly reduced, usually represented by a single short stout basally articulated seta (or, occasionally, a rigid spine-like process) situated distal to dorsal row of tibial trichobothria ( Fig. 35 ), rarely such a seta or process absent; distal component of retrolateral tibial apophysis nearly as long as tibia, somewhat swollen anterolaterally. Genital bulb ( Fig. 29–30 ) with embolus moderately long, thin; proximal arm of tegular apophysis laterally flattened with short, acuminate tip.

Measurements (n=12). CL 1.78–2.18 (1.96+0.13), CW 1.33–1.70 (1.47+0.11), SL 1.00–1.17 (1.10+0.06), SW 0.94–1.07 (1.01+0.04).

Female: (n=20). Atrium ( Figs 36, 38–39 ) anteriorly located on epigyne, inconspicuous (barely discernible in uncleared epigynes). Vulva ( Figs 37–39 ) with copulatory ducts separated; spermathecal heads at anterior margin of spermathecae, undifferentiated from spermathecal stalks; stalks short; Bennett’s glands large, conspicuous; spermathecal bases usually visible through epigynal integument ( Fig. 36 ), large, bulbous, rounded with short, slightly constricted anterior region adjacent to Bennett’s glands gradually expanding into posterior bulbous region; fertilization ducts attached to ventral surface of posterior region of bases.

Measurements (n=15). CL 1.55–1.95 (1.73+0.11), CW 1.10–1.33 (1.27+0.10), SL 0.91–1.04 (0.96+0.05), SW 0.81–0.94 (0.86+0.04). Holotype CL 1.58, CW 1.20, SL 0.91, SW 0.81.

Distribution and natural history. ( Fig. 84 ). Neocybaeina xantha comb. nov. is known only from Coos, Douglas, and Lane Counties of western Oregon, U.S.A. where it has been recorded from the southern upland reaches of the Willamette Valley to the southwestern slopes of the coastal mountains. Males have been collected from July to early August. This species was most recently recorded in 1962 and its conservation status is unknown.

Figures

FIGURES 14–18. Cybaeina and Neocybaeina gen. nov. species, males (14–15 C. dixoni spec. nov. holotype; 16–17 C. minuta from Kyuquot, British Columbia; 18 N. xantha comb. nov. from near Bridge, Oregon), left pedipalp retrolateral. 14, 16 tibia and distal tip of patellar apophysis.15, 17 medial component of retrolateral tibial apophysis.18 distal tip of patellar apophysis.Arrows indicate medial component of retrolateral tibial apophysis (14–17 single shafted arrows), distal component of retrolateral tibial apophysis (14, 16 double shafted arrows), unknown contaminant on dorsal surface of patellar apophysis (18 dashed arrow).

FIGURES 29–35. Neocybaeina xantha comb. nov., males from Oregon (29, 33–35 from near Glide; 30 from unknown locale; 31–32 from near Bridge), left pedipalp. 29 Genital bulb, ventral. 30 Tegular apophysis and embolus, retrolateral. 31–34 Tibia and patella (31, 33 retrolateral; 32, 34 dorsal). 35 medial component and distal tip of distal component of retrolateral tibial apophysis, dorsal. Cy—cymbium, DA—distal arm of tegular apophysis, dRTA—distal component of retrolateral tibial apophysis, E—embolus, mRTA—medial component of retrolateral tibial apophysis, PA—proximal arm of tegular apophysis, PTA—patellar apophysis, Tr—trichobothrium. Note: in Figs 31, 33–35 the distal end of the mRTA is a short rigid spine-like process; in Fig. 32 the mRTA terminates distally with a short basally articulated macroseta.

FIGURES 36–42. Neocybaeina gen. nov. species, females from Oregon (36–39 N. xantha comb. nov., 36 from Bandon, 37–39 from Roseburg; 40–42 N. burnetti spec. nov., 40–41 from Carpenterville, 42 from Gold Beach), copulatory organ. 36, 40 Epigyne, ventral. 37–39, 41–42 Vulva (37 dorsal; 38 ventral; 39, 41 atrial openings, copulatory ducts, and heads, stalks, and proximal portion of bases of spermathecae, ventral; 42 left half of vulva, dorsal). BG—Bennett’s gland, BS—base of spermatheca, CD—copulatory duct, FD—fertilization duct, HS—head of spermatheca, SS—stalk of spermatheca. Unlabelled arrows indicate atrial openings (36, 38, 40).

FIGURES 84–86. Distributions of Neocybaeina gen. nov. and Rothaeina gen. nov. species (84 Neocybaeina burnetti spec. nov. and N. xantha comb. nov.; 85 Rothaeina beaudini spec. nov., R. jamesi spec. nov., R. mackinleyi spec. nov., and R. sequoia comb. nov.; 86 Rothaeina petersoni spec. nov.) AZ—Arizona, CA—California, ID—Idaho, MT—Montana, OR—Oregon, NV—Nevada, UT—Utah, WA—Washington.