Thwaitesia O. P.-Cambridge, 1881

Durán-Barrón, CÉSAR G., Rosas, MARÍA V. & Contreras-Ramos, Atilano, 2013, Phylogenetic relationships of the comb-footed spider subfamily Spintharinae (Araneae, Araneoidea, Theridiidae), with generic diagnoses and a key to the genera, Zootaxa 3666, pp. 171-193 : 188

publication ID

https://dx.doi.org/10.11646/zootaxa.3768.2.2

publication LSID

lsid:zoobank.org:pub:FE211811-36E2-4A22-A55B-6E080E5CEC1D

DOI

https://doi.org/10.5281/zenodo.6156196

persistent identifier

https://treatment.plazi.org/id/5E284F15-2B16-6FF0-F77A-31DCEC0FAC65

treatment provided by

Jeremy

scientific name

Thwaitesia O. P.-Cambridge, 1881
status

 

Thwaitesia O. P.-Cambridge, 1881 View in CoL View at ENA

(Figs. 9 D, 10 A)

O. P.-Cambridge, 1881. Proc. Zool. Soc. London, p. 766. Type species by monotypy: T. margaritifera O. P.-Cambridge , 1881, op. cit., p. 767, pl. 66, fig. 1.

Diagnosis. The posterior median eyes have a distance between them about an eye diameter. Other spintharine genera present the posterior median eyes separated for less than an eye diameter or twice or more an eye diameter. Dorsally the opisthosoma presents a pigmentation pattern conformed by silver spots that become longitudinal bands (Figs. 9 D, 10 A). In the rest of genera, pigmentation forms a leaf-like pattern, just spotting, or points with no pattern defined. The male pedipalp cavity is sclerotized, only in this genus, observed dorsally in cleared specimens (Fig. 7 D). An “H” -like web architecture is shared with Episinus and Spintharus . Levi and Levi (1962) comment that Thwaitesia is close to Spintharus and Episinus and that some species are probably intermediate between them.

Distribution. Africa, Australia, Southeast Asia, Indonesia, Caribbean, Central America, South America; probably worldwide in the tropics (Platnick 2013).

Material examined. Thwaitesia affinis : BRAZIL, [Municipality Rio de Janeiro], [Town] Petropolis , April 1946, 850 m, H. Sick, 1 ♂ ( AMNH) . PANAMA, Canal zone, Summit , October 1946, N. L. H. Krauss, 1 ♀ ( AMNH) ; Summit C[anal] Z[one], November 1946, N. L. H. Krauss, 1 ♀ ( AMNH) . CO-OPERATIVE REPUBLIC OF GUYANA, Rupununi River, near mountains Makavapan , 5 October 1937, W. G. Hassler, 1 ♂ ( AMNH) . Thwaitesia bracteata : BRAZIL, [Rio de Janeiro], [City] Sumare , January 1946, 200- 300 m, H. Sick, 1 ♂ ( AMNH) ; Rio de Janeiro, [Municipality] Paineiras , 22 January 1959, A. M. Nadler, 5 ♀, 1 ♂ ( AMNH) . COLOMBIA, [Department] Amazonas, [City] Leticia , February 1956, J. N. Layne, 1 ♀ ( AMNH) . PARAGUAY, Jaguarazaga, Alto Parana , 7 ♀, 2 ♂ ( AMNH- 3721 ) .

AMNH

USA, New York, New York, American Museum of Natural History

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Theridiidae

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