Agyneta angulata ( Emerton 1882 )

Dupérré, Nadine, 2013, Taxonomic revision of the spider genera Agyneta and Tennesseellum (Araneae, Linyphiidae) of North America north of Mexico with a study of the embolic division within Micronetinae sensu Saaristo & Tanasevitch 1996, Zootaxa 3674 (1), pp. 1-189 : 151-153

Agyneta angulata ( Emerton 1882)

Figs 492–499 , map 32

Bathyphantes angulatus Emerton 1882: 71 , pl. 22, f. 5. (Description 3).

Linyphia angulata ( Emerton 1882) Marx, 1890: 527 .

Bathyphantes pallida Banks 1892: 45 , pl. 5, f. 42. (Description Ƥ).

Bathyphantes inornata Banks 1892: 46 , pl. 5, f. 66.

Microneta minutissima Banks 1892: 48 , pl. 2, f. 27.

Bathyphantes pallescens Banks 1910: 34 . (Replacement name for Bathyphantes pallidus Banks , thought congeneric with Diplostyla pallida Banks, 1892 ).

Microneta olivena Barrows 1940: 136 , f. 8, 8A–B.

Meioneta angulata Kaston 1945: 6 . (Transferred 3from Bathyphantes , synonymised Ƥ).

Agyneta angulata Buckle et al. 2001: 99 . (Transferred from Meioneta ).

Type material: Bathyphantes angulata Emerton 1882 , 23 SYNTYPES from New Haven, Conn., May 1, 1881, loose palp. J.H. Emerton Coll. (unique number 20280). MCZ, EXAMINED.

Diagnosis: Males are differentiated from all species by their extremely long lamella characteristica with folded tip ( Fig. 492 ). Females are diagnosed from all Agyneta by their protruding epigynum ( Fig. 497 ) and the arrowshaped apical part of the proximal part of scape ( Fig. 496 ).

Description: Male: Total length 1.61; carapace length 0.75, width 0.58.

CEPHALOTHORAX: Carapace light orange, shiny, finely reticulate; margin, radiating lines suffused with dark gray. Clypeus height 2. Sternum lightly suffused with dark gray. Chelicerae light orange, not excavated; setatipped tubercles absent; promargin four teeth, retromargin four tiny denticles. Cheliceral stridulatory organ ~ 17 striae, well spaced throughout. ABDOMEN: Uniformly light gray LEGS: Yellow; total length leg I: 2.74, total length leg III: 2.10; Tm I: 0.21, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis somewhat transparent, pointed and smooth; dorsal tibial apophysis absent; two retrolateral, one dorsal trichobothria ( Fig. 492 ). Cymbium triangular; glabrous depression present ( Fig. 492 ); dorsal cymbial turbercle elongated, rounded and smooth; ventral cymbial tubercle absent; prolateral notch shallow ( Fig. 493 ). Paracymbium apical pocket medium, anterior pocket long and curved, posterior pocket long reaching the anterior one ( Fig. 492 ). Embolus tip pointed and thin with retrolateral extension; basally with one sharp spikes and small spines; ventrally with small spines; Fickert’s gland globulous situated medially; ventral lamella reduced; thumb long, reaching tip of the embolus proper ( Fig. 494 ). Embolus proper set apically, on a vertical ridge associated with embolus tip, of equal part and with associated small prong ( Fig. 494 ). Anterior terminal apophysis pointed with numerous long, fine protrusions; posterior terminal apophysis small; lamella characteristica extremely long, spinose tip and a transparent short extension sub-apically ( Fig. 495 ).

Female: Total length 1.71; carapace length 0.70, width 0.54.

CEPHALOTHORAX: Coloration as in male. Chelicerae promargin five teeth, retromargin five denticles. Cheliceral stridulatory organ ~ 18 striae, well spaced throughout. ABDOMEN: Uniformly light gray. LEGS: Coloration as male; palpal tarsal claw absent; total length leg I: 2.70, total length leg III: 2.23; Tm I: 0.22, Tm IV: absent. GENITALIA: Epigynum with narrow proximal part of scape, triangular apically; epigynal slits large, not quite reaching the anterior part of the epigynum; pit hook depression absent ( Fig 496 ); lateral lobes wide and short; stretcher seemingly absent; pit small ( Fig. 498 ). Median part of scape narrow, short; genital pores situated at base of lateral lobes pockets ( Fig. 499 ). Internal genitalia with an oval, ventral receptacula, horizontally positioned and a small dorsal one ( Figs 498, 499 )

Other material examined: USA: Arkansas: no specific locality, 13.i.1961, 13, 17.i.1961, 13, 19.i.1961, 23, 26.v.1961, 1Ƥ ( CAS); Cove Creek, pitfalls, leaf litter in woods, 09.i.1960, 23, 12.xii.1960, 13, 16.xii.1960, 13, 05.i.1963, 13, 12.v.1963, 1Ƥ, O., M. Hite ( CAS). District of Columbia: Washington, 1Ƥ, Fox ( AMNH). Georgia: 9.6km S Eatonton, 01.vi.1984, 13, R. Bennett ( CNC). Kentucky: Mammoth Cave National Park, 27.vii– 02.ix.1967, forest, 1Ƥ, S. Peck ( AMNH). Maryland: Patuxtent Wildlife Research Center, 11.v.1994, 1Ƥ, 16.v.1994, 131Ƥ, 24.v.1994, 1Ƥ, G. Hormiga ( USNM). Missouri: Columbia, xi.1904, 134Ƥ, vii.1905, 235Ƥ, x.1905, 134Ƥ, C. Crosby ( AMNH). North Carolina: 16km NE Deep Gap, 17.x.1965, 13, J., W. Ivie ( AMNH); 32km SE Asheville, N foothill of Mount Pisgah, 15.x.1965, oak leaves, 10315Ƥ, J., W. Ivie ( AMNH); Blowing Rock, 17.x.1965, 738Ƥ, J., W. Ivie ( AMNH); Blowing Rock, 10.x.1923, 13, C. Crosby, Bishop ( AMNH); Cane Creek, 06.ix.1983, Berlese, hickory oak, 2Ƥ, R. Bennett ( CNC); Cullowhee, Caneck road, 853m, 06–12. viii.1983, 13, R. Bennett ( CNC); Frying Pan gap, Mount Pisgah, 13.x.1926, 431Ƥ, C. Crosby, Bishop ( AMNH); Great Smoky Mountain National Park, SE crossing Cataloochee road, 822m, 09.x.1983, 13, R. Bennett ( CNC); Highway 76 and Chattooga road, 377m, 02.i.1984, 1Ƥ, R. Bennett ( CNC); Montreat, 16.x.1923, 537Ƥ, C. Crosby, Bishop ( AMNH); Mount Pisgah, 914m, 19.x.1923, 132Ƥ, C. Crosby, Bishop ( AMNH); Mount Pisgah summit, 14.x.1926, 13, C. Crosby, Bishop ( AMNH); Nantahala River Valley, 1Ƥ, J. Carico ( USNM); Raleigh, 26.x.1923, 435Ƥ, C. Crosby, Bishop ( AMNH). New Jersey: Base River State Forest, 10.v.1964, 133Ƥ, J., W. Ivie ( AMNH). New York: Lake Keuka, 13, R. Chamberlin ( AMNH). Pennsylvania: Colton Point State Park, 15.vii.1970, Berlese, 1Ƥ, W. Muchmore ( AMNH). Tennessee: Knoxville, 20.viii.1939, 13, R. Chamberlin ( AMNH); Great Smoky Mountain National Park, Chestnut Top Trail, 20.viii.1978, under rock, 1Ƥ, V. Mcneilus ( TMM). Virginia: Fredericksburg, 06.iii.1971, Berlese, swamp, 131Ƥ, C. Alteri ( AMNH); Mountain Lake Biological Station, vii.1970, Berlese, 4Ƥ, W. Muchmore ( AMNH). West Virginia: Sleepy Creek Hunt and Fish Area, Third Hill Mountain, pitfall in oak-pine forest, 06–13. vi.1986, 13, 09–17. vii.1986, 13, P. Martinat ( USNM); West Virginia University, Forest Chestnut Ridge, pitfall in mixed oak-hardwood forest, 22–29. v.1990, 13, 05–12. vi.1990, 1 Ƥ, D. Jennings ( AMNH).

Distribution: Eastern USA, west to Missouri and Arkansas.

Figures

FIGURES 492 – 499. Agyneta angulata (Emerton 1882). 492 – 495, Male. 496 – 499, Female. 492. Palp, retrolateral view. 493. Palp, prolateral view. 494. Embolus, prolateral view. 495. Radical division, retrolateral view. 496. Epigynum, ventral view. 497. Epigynum, lateral view. 498. Internal genitalia, ventral view. 499. Internal genitalia, dorsal view.