Glenognatha minuta Banks, 1898

Jimmy Cabra-García & Antonio D. Brescovit, 2016, Revision and phylogenetic analysis of the orb-weaving spider genus Glenognatha Simon, 1887 (Araneae, Tetragnathidae), Zootaxa 4069 (1), pp. 1-183 : 148-153

publication ID

https://doi.org/10.11646/zootaxa.4069.1.1

publication LSID

lsid:zoobank.org:pub:52FC658C-78C7-49FC-9961-8AC43CA03101

DOI

https://doi.org/10.5281/zenodo.5666985

persistent identifier

https://treatment.plazi.org/id/8E0E8F67-7D81-FF10-ACBA-0CE0FA29D57F

treatment provided by

Plazi

scientific name

Glenognatha minuta Banks, 1898
status

 

Glenognatha minuta Banks, 1898

( Figs. 122–125 View FIGURE 122 View FIGURE 123 View FIGURE 124 View FIGURE 125 , 137 View FIGURE 137 )

Glenognatha minuta Banks, 1898: 218 , pl. 15, fig. 15. (male syntype from Baja California, San Jose del Cabo, Mexico, Eisen & Vaslit leg., deposited in MCZ 125505, examined); Hormiga & Döbel 1990: 202, figs. 25–30; Cabra-García et al. 2014: 1029, figs. 1O, 3D, 4F, 6D, 8E, 9N; World Spider Catalog 2015.

Glenognatha centralis Chamberlin, 1925: 216 (male holotype from Panama, R. V. Chamberlin leg., deposited in MCZ 125347 View Materials , examined). New synonymy.

Synonymy justification. We examined the male holotype of G. centralis ( MCZ 125347) (collected from the stomach of a toad, Bufo sp.) and concluded that the specimen is a subadult male due to the undeveloped male palp sclerites. This conclusion was supported by the finding of a subadult male of G. foxi (from Arizona, AMNH), caught in the molting process, that exhibits a similar palp morphology. After comparison with numerous Glenognatha specimens collected in Panama, we concluded that the morphology of the chelicerae in G. centralis is too similar with the diagnostic morphology found in G. minuta specimens; which is characterized by enlarged Ret2 and Ret3 ( Figs. 123A–C View FIGURE 123 ). The chelicerae orientation and the size of the tegulum, cited as diagnostic for G. centralis by Hormiga & Döbel (1990), are not sufficient to maintain a separate species, as these characters can vary in G. minuta . The unusual shape of the conductor, cited by Hormiga & Döbel (1990) also as a diagnostic character, could be an artifact of the developmental stage of the specimen, the preservation and the digestive process suffered.

Diagnosis. Males of G. minuta can be easily distinguished from all other Glenognatha species by the morphology of the chelicerae, which has a small Ret1 and prominent Ret2 and Ret3, the latter being bigger ( Figs. 123A–C View FIGURE 123 ). Females can be distinguished from all other Glenognatha (except G. emertoni ) by the presence of an anterior cheliceral bulge ( Fig. 123F View FIGURE 123 ); distinguished from G. emertoni by the well-developed spermathecae ( Figs. 125A–D View FIGURE 125 ) and the oval-shaped chelicerae in mesal view ( Fig. 123F View FIGURE 123 ).

Description. Male described by Hormiga & Döbel (1990). Additional data.

Male ( Mexico, Jalisco, Atenquique, AMNH). Habitus as in Figures 122A–D View FIGURE 122 . Carapace brown, darker along furrows. Sternum brown with darker edges. Abdomen oval, dorsally with diffused irregular lateral bands. Silver guanine spots scattered in dorsal and lateral surfaces. Venter pale greyish with scattered silver guanine spots. Tracheal spiracle well-sclerotized. Legs yellow-brownish. Total length 2.37. Cephalothorax 1.10 long, 0.82 wide, 0.62 high. Abdomen 1.30 long, 1.12 wide, 1.07 high. Sternum 0.55 long, 0.60 wide. Eye diameters and interdistances: AME 0.09. ALE 0.07. PME 0.08. PLE 0.08. AME-AME 0.06, AME-ALE 0.08, PME-PME 0.075, PME-PLE 0.075, ALE-PLE 0.01. Clypeus height 1.8. Chelicerae brown. Three promarginal and four retromarginal teeth ( Figs. 123A–C View FIGURE 123 ). Ret2 and Ret3 enlarged ( Fig. 123B–C View FIGURE 123 ). Leg measurements: I: femur 1.37, patella 0.35, tibia 1.25, metatarsus 1.15, tarsus 0.65, total 4.77; II: 1.30, 0.32, 1.25, 1.05, 0.65, 4.57; III: 0.87, 0.25, 0.62, 0.65, 0.40, 2.80; IV: 1.08, 0.25, 0.87, 0.85, 0.47, 3.53. DTS 0.20. DTE 0.50. Palp as in Figures 124E–H View FIGURE 124 . Distal end of the conductor lamina sharp ( Figs. 124B–C View FIGURE 124 , 125H–J View FIGURE 125 ).

Female ( Mexico, Yucatán, AMNH) (Note: the female is here described for the first time). Coloration and general habitus as in male ( Figs. 122E–H View FIGURE 122 ). Abdomen with silver guanine spots arranged in two longitudinal bands that extends to the lateral surfaces. Venter with a median diffused dark band. Total length 2.95. Cephalothorax 1.27 long, 0.92 wide, 0.85 high. Abdomen 1.75 long, 1.57 wide, 1.52 high. Sternum 0.17 long, 0.21 wide. Eye diameters and interdistances: AME 0.09. ALE 0.07. PME 0.08. PLE 0.07. AME-AME 0.07, AME-ALE 0.12, PME-PME 0.13, PME-PLE 0.13, ALE-PLE 0.01. Clypeus height 1.60. Chelicerae brown. Cheliceral basal segment with a mesally oriented distal projection ( Fig. 123D View FIGURE 123 ) and anterior bulge ( Fig. 123F View FIGURE 123 ). Three promarginal and four retromarginal teeth. ( Figs. 123D–F View FIGURE 123 ). Leg measurements: I: femur 1.57, patella 0.40, tibia 1.47, metatarsus 1.27, tarsus 0.67, total 5.40; II: 1.47, 0.47, 1.30, 1.20, 0.65, 5.10; III: 0.95, 0.30, 0.65, 0.70, 0.37, 2.97; IV: 1.37, 0.30, 1.05, 0.80, 0.50, 4.02. DTS 0.08. DTE 0.14. Tracheal system as in Figures 125E–G View FIGURE 125 . Genitalia with well-developed spermathecae ( Figs. 125A–D View FIGURE 125 ). Uterus externus with a median projection ( Figs. 125A, C View FIGURE 125 ).

Variation. Male total length 2.1–2.6 (N = 10; average 2.3), cephalothorax length 1.0–1.2 (N = 10; average 1.1), femur I length 1.3–1.6 (N = 10; average 1.5). Female total length 2.2–3.5 (N = 10; average 2.9), cephalothorax length 1.0–1.7 (N = 10; average 1.32), femur I length 1.2–2.0 (N = 10; average 1.5). In specimens from Panama the cheliceral anterior bulge is more sharpened.

Distribution. Known in Mexico, Guatemala, Costa Rica, Panama, Cuba and Republica Dominicana ( Fig. 137 View FIGURE 137 ).

Additional material examined (N = 30). CUBA: Cienfuegos: Soledad, [Jardín Botánico de Cienfuegos], [22º7´N, 80º20´W], elev. [50m], 1–11.viii.1934, P. J. Darlington leg., 1♂ ( MCZ 125505) .

New records. MEXICO: Jalisco: Atenquique , [19º31´N, 103º26´W], elev. [1168m], 5.xii.1948, H.B. Leech leg., 1♂ ( AMNH) GoogleMaps . Nayarit: Ixtlan del Rio , [21º1´N, 104º21´W], elev. [1051m], 22.ix.1962, B. Malkin leg., 1♀ ( AMNH) GoogleMaps . Nuevo León: Monterrey , [25º37´N, 100º17´W], elev. [599m], 10.vi.1936, Davis leg., 1♂ ( AMNH) GoogleMaps ; Allende: Rio Ramos , [25º16´N, 100º52.13´W], elev. [663m], 18.viii.1954, F. N. Young leg., 1♂ ( AMNH) GoogleMaps . San Luis Potosí: Tamazunchale , [21º15´N, 98º47´W], elev. [135m], 25.xi.1938, A. M. & L. I. Davis leg., 1♂ ( AMNH) GoogleMaps ; Tamazunchale, arroyo La Chorrera , [21º15´N, 98º47´W], elev. [135m], 28.iii.1937, A. M. & L. I. Davis leg., 1♂ ( AMNH) GoogleMaps ; 10 mi. N.E. Xilitla , 21º27´N, 98º55´W, elev. [132m], 19.iv.1963, W. J. Gertsch & W. Ivie leg., 2♂ 1 immature ( AMNH) GoogleMaps . Sinaloa: Piaxtla ( River ), 23º50´N, 106º40´W, elev. [33m], 16.v.1963, W. J. Gertsch & W. Ivie leg., 1 immature ( AMNH) GoogleMaps . Sonora: Hermosillo , [29º5´N, 110º56´W], elev. [235m], 9–16.vii.1953, B. Malkin leg., 1♀ ( AMNH) GoogleMaps . Yucatán: Chichen Itza, Cenote Stolc ., [20º40´N, 88º34´W], elev. [35m], 10.vii.1948, C. & M. Goodnight leg., 1♀ ( AMNH) GoogleMaps ; 26.v.1980, J. Coddington leg., 3♀ 1♂ ( USNM) ; 1♀ ( USNM) . GUATEMALA: Petén: Tikal , [17º12´N, 89º37´W], elev. [312m], 1931, Dice & Bartlett leg., 1♀ ( MCZ 125478 View Materials ) GoogleMaps . REPUBLICA DOMINICANA: La Romana: Guaymate (14 Km N), [18º41´N, 68º58´W], elev. [264m], 16.ix.1984, R. Faitoute leg., 1♀ ( USNM) GoogleMaps . COSTA RICA: [San José]: San Jose , [9º56´N, 84º4´W], elev. [1152m], E. Schmidt leg., 1♀ ( AMNH) GoogleMaps ; Machuca , [10º48´N, 83º36´W], elev. [14m], N. Banks leg., 1♀ ( MCZ 66544 View Materials ). GoogleMaps PANAMA: [Chiriquí]: El volcán, [8º46´N, 82º37´W], elev. [1400m], 26.ii.1936, W. J. Gertsch leg., 3♀ 3♂ ( AMNH) GoogleMaps . [Panamá]: Barro Colorado Island, Canal Zone , [9º9´N, 79º50´W], elev. [150m], vi.1950, A. M. Chickering leg., 1♀ ( MCZ 125496 View Materials ) GoogleMaps ; Canal Zone, Forest reserve , [9º9´N, 79º50´W], elev. [150m], 29.i.1958, A. M. Chickering leg., 1♂ ( MCZ 129050 ) GoogleMaps .

MCZ

Museum of Comparative Zoology

AMNH

American Museum of Natural History

DTE

Centro de Investigaciones Cient�ficas y Transferencia de Tecnolog�a a la Producci�n (CICyTTP-CONICET)

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Tetragnathidae

Genus

Glenognatha

Loc

Glenognatha minuta Banks, 1898

Jimmy Cabra-García & Antonio D. Brescovit 2016
2016
Loc

Glenognatha centralis

Chamberlin 1925: 216
1925
Loc

Glenognatha minuta

Cabra-Garcia 2014: 1029
Hormiga 1990: 202
Banks 1898: 218
1898