Agyneta serrata Emerton 1909
Creators: name: Dupérré, Nadine
Publisher: name: Zenodo
Year: 2013
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Agyneta
Agyneta serrata

description: Agyneta serrata (Emerton 1909)
Figs 443–449, map 29
Microneta serrata Emerton 1909: 198, pl. 4, f. 15. (Description 3).
Centromerus serrata Kaston 1948: 137, f. 330–332. (Transferred 3 from Microneta).
Meioneta beaufortensis Barnes 1953: 4, f. 1–2. (Description 3Ƥ). (Holotype 3, Paratype 3 from N.C., Beaufort, Carteret Co., June 16, 1952, Coll. R.D. Barnes, AMNH). Examined.
Centromerus emertoni Kaston 1972: 105.
Meioneta serrata van Helsdingen 1973: 9. (Transferred 3from Centromerus, synonymised Ƥ).
Agyneta serrata Buckle et al. 2001: 101. (Transferred from Meioneta).
Type material: Microneta serrata Emerton 1909, 3 HOLOTYPE from Boston, 20 Nov.1900. J.H. Emerton Coll., fence near the common (unique number 23039). MCZ, EXAMINED.
Diagnosis: Males are diagnosed from all other species in the genus by the tulip-shaped lamella characteristica (Fig. 443), from members of the group by the presence of extremely long spine-like extensions on the ventroretrolateral side of the embolus (Fig. 445). Females are diagnosed from all Agyneta by their deeply excavated proximal part of scape (Fig. 447).
Description: Male: Total length 1.31; carapace length 0.57, width 0.42.
CEPHALOTHORAX: Carapace light orange, shiny, finely reticulate; radiating lines, margin suffused with dark gray; trident mark present. Sternum light orange, suffused with dark gray. Clypeus height 2. Chelicerae light orange, with transverse dark gray suffused band, not excavated; seta-tipped tubercles absent; promargin five teeth, retromargin four denticles. Cheliceral stridulatory organ ~19 striae, well spaced throughout. ABDOMEN: Uniformly light to dark gray, sometimes with apical white hourglass mark. LEGS: Light yellow, femurs lightly suffused with gray; leg I total length: 2.07; leg III total length: 1.43; Tm I: 0.23, Tm IV: absent. GENITALIA: Palpal retrolateral tibial apophysis small, pointed and smooth; dorsal tibial apophysis reduced, rugose; two retrolateral trichobothria and one dorsal (Fig. 443). Cymbium triangular; glabrous depression present (Fig. 443); dorsal cymbial tubercle triangular, smooth; ventral tubercle triangular, rugose; prolateral notch medium (Fig. 444). Paracymbium apical pocket long, anterior pocket long and curved making a small cover, posterior pocket absent (Fig. 443). Embolus tip pointed, no retrolateral extension; basally with one spine; ventrally with numerous small spines; retro-ventrally with numerous large spine-like extensions; Fickert’s gland absent; ventral lamella reduced or absent; thumb going slightly over the embolus proper (Fig. 445). Embolus proper set apically, part about equal, not serrated with associated large prong (Fig. 445). Anterior terminal apophysis tip wide with long protrusions and one small basal prong; posterior terminal apophysis short with well sclerotized tip and basal prong; lamella characteristica large, square and with one pointed tip (Fig. 446).
Female: Total length 1.35; carapace length 0.57, width 0.41.
CEPHALOTHORAX: Same coloration as male. Chelicerae yellowish; promargin six teeth, retromargin five denticles. Cheliceral stridulatory organ ~19 striae, well spaced throughout. ABDOMEN: Same as male, sometimes with the typical white hourglass mark. LEGS: Same as male; palpal segments suffused with dark gray, palp tarsus normal, claw absent; leg I total length: 1.98; leg III total length: 1.41; Tm I: 0.25, Tm IV: absent. GENITALIA: Epigynum with proximal part of scape wide, deeply excavated; epigynal slits M-shaped; pit hook depression deep (Fig. 447); lateral lobes medium; stretcher and pit small (Fig. 448). Median part of scape long and wide; genital pores situated at base of lateral lobes pockets (Fig. 449). Internal genitalia with rounded ventral receptacula, dorsal receptacula elongated (Figs 448, 449).
Other material examined: CANADA: Ontario: Raymonds Corners, 25km N Kingston, 09.vi–15.viii.1977, rocky pasture, 132Ƥ, C. Dondale, J. Redner (CNC). USA: Arkansas: no specific locality, 1Ƥ, W. Whitcomb, 25.vi.1964, 1Ƥ, 14.viii.1963, pitfall in pasture 33, Trafford, 07.vii.1965, alfalfa, 1Ƥ, Dumas (CAS); Cove Creek, 22.ix.1962, 231Ƥ, 12.v.1963, 13, O., M. Hite (CAS); Jonesboro, 12.i.1967, pitfall in Oak-Hickory, 13, Hite (CAS); Meramec River, 14-18. vii.1966, 1 Ƥ, H.E.F, D.L.F. (CAS); Pow-34, 22.vi.1963, 1Ƥ, W. Whitcomb (CAS); Round Prairie, pitfall, 06.v.1965, 33, 06–21. v.1965, 1 Ƥ, 23.iv.1965, 33 (CAS). Florida: 3.2km SE Marathon, 15.xii.1962, 32345Ƥ, W. Ivie (AMNH); 12km NNW Stuart, 12.xii.1962, 23, W. Ivie (AMNH); 16km W Gainesville, 14.ii.1942, 1Ƥ, W. Ivie (AMNH); Archibold Biological Station, iv.1956, rotten log and stump, litter of Pinus claura, 2Ƥ, C. Hoff (AMNH); Big Pine Key (east end) 13.xii.1962, 13, W. Ivie (AMNH); Big Pine Key, Cactus Hammock, 02.ix–15.xii.1986, pitfall in forest, 1Ƥ, S., J. Peck (AMNH); Big Pine Key, Watsons Hammock, 23.ii–03.vi.1986, malaise-flight interception trap in hammock forest, 23, S., J. Peck (AMNH); Cape Sable, 27.ii.1936, 1Ƥ, Crosby, Bishop (AMNH); Dunedin, 31.xii.1925, 1Ƥ, W. Blatchley (AMNH); Fort Myers Beach, 17.iii.1954, 232Ƥ, W. Ivie (AMNH); Fort Myers vicinity, xii.1934, 231Ƥ, W. Barrows (AMNH); Gainesville 01.i.1926, 13, Hubbell, 14.i.1939, 1Ƥ, 10.ii.1942, 539Ƥ, W. Ivie (AMNH); Gainesville, 01–14.ii.1979, pan trap in oak-pine, 131Ƥ, E. Becker (CNC); Gainesville, Newmans’s Lake, 13.vi.1935, 333Ƥ, W. Ivie (AMNH); Gainesville, W Newmans’s Lake, 12.ii.1942, 1Ƥ, W. Ivie (AMNH); Lignum Vitae Key, vii.1981, Malaise trap, 23, S. Peck (CNC); Micanopy, 06.iii.1927, 13, W. Barrows (AMNH); South Miami, Deering Estate Park, SW 167 street and SW 72 avenue, 01.vi–25.viii.1986, malaise in young hammock forest, 434Ƥ, S., J. Peck (AMNH); Sugarloaf Key, Kitchings, malaise in young hammock forest, 19.xi.1985 – 26.ii.1986, 13, 26.ii–06. vi.1986, 13, S., J. Peck (AMNH); Sugarloaf Key, SE ¼, 29.viii–14.xii.1986, malaise in young hammock forest, 1Ƥ, S., J. Peck (AMNH). Georgia: 1.6km N Sylvania, 10.iv.1943, 1Ƥ, W. Ivie (AMNH); Stone Mountain, 04.ii.1931, 1Ƥ, H. Dietrich (AMNH); Little Cumberland Island, 15-19. iii.1997, 13, W. Steiner (USNM). Missouri: Knob Noster State Park, 15–22.iv.1978, 131Ƥ, 01–08. v.1978, 1 Ƥ, 05–12. vi.1978, 13, 23–31. vii.1978, 13, 14–21. viii.1978, 13, 26.iii–03. iv.1979, 1 Ƥ, 16–22. iv.1979, 13, 16–26.v.1979, 131Ƥ, pitfall in bushy prairie, S. Peck, Peaslee (CAS); Rolla, 25.vi.1963, 1Ƥ, H.E.F (CAS). New York: Crosby, x.1903, 1 Ƥ, C. Crosby (AMNH); Sea Cliff, 1Ƥ (AMNH). Oklahoma: Stillwater, vi–ix.1966, 1 Ƥ, C. Bailey (JCC). Pennsylvania: 4.8km S Rector, 20.vi.1967, 1Ƥ, B. Vogel (AMNH); Pittsburgh, 02.v.1968, 1Ƥ, B. Vogel (AMNH). Texas: no specific locality, i–iii.1936, 431Ƥ, xii.1936, 13, L. Davis (AMNH); 6.4km E Santa Maria, ix.1936, 1 Ƥ, L. Davis (AMNH); 12km NE Sinton, 11.viii.1959, 13, 22.iii.1960, 13, 05.iv.1960, 13, 28.iv.1960, 131Ƥ, 26.v.1960, 23, H. Laughlin (AMNH); 12km NE Sinton, 26.v.1960, 23, W. Ivie (AMNH); 17km N LaGrange, 18.vii.1966, 1Ƥ, J., W. Ivie (AMNH); Blackhole, Camp Bullis, 07.vi.1994, 23, J. Ivy, G. Veni (TMM); Ebert Cave, 21.v.1994, 1Ƥ, G. Veni (JCC); Edinburg, xii.1935, 2 Ƥ, 01.v.1936, 534Ƥ, S. Mulaik (AMNH); Fresnos Resaca, 6.4km S Harlingen, v.1937, 13, L. Davis (AMNH); Houston, 11.vi.1937, 13, S. Mulaik (AMNH); Rio Grande City, 01.v.1937, 1Ƥ, S. Mulaik (AMNH); Southmost Palms, Brownsville, iv.1941, 1 Ƥ, L. Davis (AMNH); Valley Cave, iii.1994, 13, M. Warton (TMM); Wurzbach Bat Cave, 22.v.1993, 1Ƥ, J. Loftin, J. Reddell, M. Reyes (TMM). Virginia: 6 km S Zuni at Blackwater River, 14- 15. vi.1989, 1 Ƥ, W. Steiner (USNM). Wisconsin: Oliver Prairie, vi.1968, 1 Ƥ, 23.v.1969, 13, 27.v.1969, 231Ƥ, litter, S. Riechert (TMM). West Virginia: Glendale, 29.vii.1973, grassy hillside, 2Ƥ, J. Redner (CNC).
Distribution: Eastern USA, west to Texas and Ontario.
The lophophor group includes only two species A. lophophor (Chamberlin & Ivie 1933) and A. girardi n. sp., both widely distributed.
This small group shares a unique character, the presence of a rugose extension on the apico-ventral part of the embolus (Figs 453 arrow, 461).
The group can be characterized by the combination of these characters: males and females without abdominal pattern; males chelicerae excavated, both margins with a projection near base of fang. Cymbium without tubercles and prolateral notch (Figs. 452, 460). Palpal tibia with two retrolateral and one dorsal trichobothria; tibial apophysis reduced; paracymbium with small apical, anterior and posterior pockets (Figs 450, 459). Embolus with enlarged base; ventral lamella present; thumb very long, reaching well beyond the embolus proper; embolus proper set apically, on a short horizontal ridge; Fickert’s gland present (Figs 453, 461). Females are characterized by a epigynum with proximal part of scape narrow; extremely large epigynal slits, not completely filled by the lateral lobes; pit hook depression wide but shallow (Figs 455, 463) and stretcher absent (Figs 457, 465).
description: Published as part of 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, pp. 1-189 in Zootaxa 3674 (1) on pages 136-138, DOI: 10.11646/zootaxa.3674.1.1, http://zenodo.org/record/283954