Anelosimus nelsoni Agnarsson

Agnarsson, Ingi & Zhang, Jun-Xia, 2006, New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism, Zootaxa 1147, pp. 1-34 : 26-28

publication ID

https://doi.org/ 10.5281/zenodo.172074

DOI

https://doi.org/10.5281/zenodo.6255423

persistent identifier

https://treatment.plazi.org/id/4A2887D5-E521-9C33-FEB1-FE7FD859E1C1

treatment provided by

Plazi

scientific name

Anelosimus nelsoni Agnarsson
status

sp. nov.

Anelosimus nelsoni Agnarsson View in CoL n. sp.

( Figs 14A–C View FIGURES 14 A – C , 15A–F View FIGURES 15 A – F , 16A–G View FIGURES 16 A – G , 17A–F View FIGURES 17 A – F )

Types

Male holotype and paratype (1 Ψ) from South Africa, Kwazulu Natal St. Lucia Estuary, Fanies Island, 5 km S of Cape Vidal, 28°06’41”S, 32°25’51”E 5.iv. 2001,I. Agnarsson et al., deposited in NMNH

Diagnosis

Anelosimus nelsoni n. sp. males can be separated from other Anelosimus by the shape of the large and bifurcate ‘embolic division b’, and the conspicuous hook on the distal portion of the embolus base ( Figs 14A View FIGURES 14 A – C , 15B–D View FIGURES 15 A – F ). Females differ from all other Anelosimus by the copulatory duct wrapping the spermathecae ( Fig. 14C View FIGURES 14 A – C ).

Description

Male (holotype): Total length 2.08. Prosoma 1.20 long, 0.90 wide, pale yellowish, center and a narrow rim dark. Sternum 0.75 long, 0.60 wide,, pale yellowish, lightest in center. Opisthosoma 1.10 long, 0.90 wide, 0.90 high. Pattern other Anelosimus . Eyes subequal in size about 0.07 in diameter. Clypeus height about 2.3 times AME diameter. Leg I femur 1.60, patella 0.50, tibia 1.55, metatarsus 1.40, tarsus 0.62. Femur about 6 times longer than wide. Leg formula 1423. Leg pale yellowish, narrow dark rings near all joints (except coxae–trochanter). 4–7 small trichobothria dorsally on all tibia, 5–6 on tibia I, 6 on tibia III. 2 prolateral and 1 retrolateral trichobothrium on palpal tibia. Stridulatory pick row on opisthosoma distinctly curved, with distal setae compressed, consisting of approximately 27–32 modified setal bases ( Figs 16E–F View FIGURES 16 A – G ). Epiandrous gland spigots in two distinctly separate groups with approximately 6–7 fusules ( Fig. 16C View FIGURES 16 A – G ).

Palpal organ as in Figures 14A View FIGURES 14 A – C , 15A–F View FIGURES 15 A – F .

Female (paratype): Total length 2.60. Prosoma 1.40 long, 1.00 wide, pale yellowish, center and a narrow rim dark. Sternum 0.90 long, 0.65 wide, pale yellowish, lightest in center. Opisthosoma 1.45 long, 1.25 wide. Pattern as in other Anelosimus . Eyes subequal in size about 0.07 in diameter. Clypeus height about 2.5 times AME diameter. Leg I femur 1.60, patella 0.50, tibia 1.35, metatarsus 1.25, tarsus 0.60. Femur about 6 times longer than wide. Leg formula 1423. Leg pale yellowish, narrow dark rings near all joints (except coxae­trochanter). 5–6 small trichobothria dorsally on all tibia, 5–6 on tibia I, 5 on tibia III. 4 dorsal trichobothria on palpal tibia on one side ( Fig. 17E View FIGURES 17 A – F ), 3 on the other. Epigynum as in Figures 14B–C View FIGURES 14 A – C , 16A–B View FIGURES 16 A – G .

Distribution

Only known from the type locality.

Natural history

This species was collected beating bushes and trees during day. Webs were not seen. The habitat was a small, open, forest patch, situated on a small river island.

Phylogenetics

Anelosimus nelsoni n. sp. was included in the phylogenetic analyses of Agnarsson (2005, 2006) as Anelosimus sp. 5 South Africa. In these analyses A. nelsoni n. sp. was sister to the ‘epigynal scape clade’ (see Agnarsson 2006), together these form a clade here termed the ‘basal cymbial hood clade’ ( Fig. 1 View FIGURE 1 ), referring to a synapomorphy shared by all species in it ( Fig. 15F View FIGURES 15 A – F ).

m.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Theridiidae

Genus

Anelosimus

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF