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129 results for “Anelosimus”
FIGURES 16A–G. Anelosimus nelsoni n in New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism
FIGURES 16A–G. Anelosimus nelsoni n. sp. A, epigynum, ventral; B, same, caudal; C, epiandrous gland fusules; D, female stridulatory pick row; E, male opisthosoma, pedicel area, ventral; F, male stridulatory pick row, left side; G, female left spinning field (ALS anterior lateral spinneret, PLS posterior lateral spinneret, PMS posterior median spinneret). Scale bars: A–B, D–E, G, 100 m; C, F, 10 m.
FIGURES 17A–F. Anelosimus nelsoni n in New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism
FIGURES 17A–F. Anelosimus nelsoni n. sp. A, female prosoma, dorsal; B, same, lateral; C, male sternum, ventral; D, male tarsus I tip, lateral; E, female pedipalpal tibia, dorsal, with four trichobothria (the other pedipalpal tibia of the same animal had only three); F, female opisthosoma surface, near center laterally. Scale bars: A–C, F, 100 m; E, 50 m; D, 10 m.
FIGURES 15A–F. Anelosimus nelsoni n in New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism
FIGURES 15A–F. Anelosimus nelsoni n.sp., male pedipalpus, slightly expanded (C conductor, E embolus, Eb 'embolic division b', MA median apophysis, SC subconductor, ST subtegulum, T tegulum, TTA theridiid tegular apophysis). A, prolateral; B, prolateralventral; C, ventral; D, retrolateralventral; E, retrolateral; F, details of pedipalpus, retrolateral, showing basal cymbial hood (arrow), the sawtoothed edge may be a basal part of the TTA. Scale bars: A–E, 100 m; F, 50
FIGURES 9A–G. Anelosimus dude n in New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism
FIGURES 9A–G. Anelosimus dude n. sp. A, epigynum, ventral; B, epiandrous gland fusules; C, female prosoma, dorsal; D, female stridulatory pick row; E, male left stridulatory pick row; F, male first leg; G, female left spinning field (ALS anterior lateral spinneret, PLS posterior lateral spinneret, PMS posterior median spinneret). Scale bars: C–D, F, 100 m; A, 50 m; B, 50 m; G, 20 m; E, 10 m.
FIGURE 1 in New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism
FIGURE 1. Summary cladogram of Anelosimus species based on Agnarsson (2005, 2006). The approximate placement of the 'agnar group' (A. agnar n. sp. and A. linda n. sp.), indicated with an arrow, is based on preliminary molecular data (Agnarsson unpublished). Alternatively the agnar group may belong to the filiform embolus clade. In Agnarsson (2005, 2006) A. sp. 2 Tanzania = A. biglebowski n. sp, A. sp. 3 Tanzania = A. dude n. sp., A. sp. 4 Singapore = A. kohi Yoshida, 1993, and A. sp. 5 South Africa = A. nelsoni n. sp. Preliminary morphological evidence such as filiform embolus, tegular ridge, and voluminous spermathecae (see Agnarsson 2006 for details) further indicate the placement of A. monskenyensis n. sp., A. sulawesi n. sp., A. chonganicus Zhu, 1998, A. crassipes (Bösenberg & Strand, 1906), A. dubius (Tullgren, 1910), A. exiguus Yoshida, 1986, A. iwawakiensis Yoshida, 1986, and A. taiwanicus Yoshida, 1986 in the 'filiform embolus clade'.
FIGURES 8A–F. Anelosimus dude n in New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism
FIGURES 8A–F. Anelosimus dude n. sp., male pedipalpus (C conductor, E embolus, MA median apophysis, ST subtegulum, T tegulum, TTA theridiid tegular apophysis). A, dorsal; B, prolateral; C, prolateralventral; D, ventral, note a distinct groove in the tegulum (arrow); E, retrolateral; F, details of embolus and distal sclerites, caudoventral. Scale bars: A–E, 100 m; F, 50 m.
FIGURES 7A–G. Anelosimus biglebowski n in New species of Anelosimus (Araneae: Theridiidae) from Africa and Southeast Asia, with notes on sociality and color polymorphism
FIGURES 7A–G. Anelosimus biglebowski n. sp. A, epigynum, ventral; B, epiandrous gland spigots, ventral; C, male opisthosoma, stridulatory picks; D, female opisthosoma, left stridulatory pick row, ventral; E, male prosomal stridulatory ridges, dorsal; F, colular setae (arrow); G, male femur I. Scale bars A–B, D, 20 m; C, G 100 m; D–E, 10 m.
FIGURES 10–14 in The cobweb spiders of the genus Anelosimus Simon, 1891 (Araneae: Theridiidae) in Hainan Island, China
FIGURES 10–14. Anelosimus seximaculatum (Zhu, 1998) n. comb. 10–12, male. 10, body, dorsal view; 11, male left palp, ventral view; 12, same, prolateral view; 13–14, female. 13, epigynum, ventral view; 14, vulva, dorsal view. Scale bars: 10, 0.5 mm; 11-14, 0.1 mm.
FIGURES 7–9. Anelosimus subcrassipes n in The cobweb spiders of the genus Anelosimus Simon, 1891 (Araneae: Theridiidae) in Hainan Island, China
FIGURES 7–9. Anelosimus subcrassipes n. sp. 7–9, female holotype. 7, body, dorsal view; 8, epigynum, ventral view; 9, vulva, dorsal view. Scale bars: 7, 0.5 mm; 8–9, 0.1 mm.
FIGURES 19 in The cobweb spiders of the genus Anelosimus Simon, 1891 (Araneae: Theridiidae) in Hainan Island, China
FIGURES 19. Distribution patterns of the species of the genus Anelosimus in Asia.Ο, A. membranaceus; ★, A. subcrassipes;, A. seximaculatum; ˔, A. chonganicus; ․, A. exiguus; ●, A. agnar;, A. crassipes;, A. iwawakiensis;, A. kohi; Ç, A. linda; □, A. sulawesi;, A. taiwanicus.
FIGURES 15–18. Anelosimus chonganicus Zhu, 1998. 15–16, male. 15 in The cobweb spiders of the genus Anelosimus Simon, 1891 (Araneae: Theridiidae) in Hainan Island, China
FIGURES 15–18. Anelosimus chonganicus Zhu, 1998. 15–16, male. 15, body, dorsal view; 16, male left palp, ventral view; 17–18, female. 17, epigynum, ventral view; 18, vulva, dorsal view. Scale bars: 15, 0.5 mm; 16–18, 0.1 mm.
FIGURES 1–6. Anelosimus membranaceus n in The cobweb spiders of the genus Anelosimus Simon, 1891 (Araneae: Theridiidae) in Hainan Island, China
FIGURES 1–6. Anelosimus membranaceus n. sp. 1, 3–4, male holotype. 1, body, dorsal view; 2, opisthosoma of other male, dorsal view; 3, male left palp, ventral view; 4, same, prolateral view; 5–6, female paratype. 5, epigynum, ventral view; 6, vulva, dorsal view. Scale bars: 1–2, 0.5 mm; 3–6, 0.1 mm.
FIGURE 2. Zatypota riverai Gauld, 1991 in Parasitism of Zatypota riverai Gauld (Hymenoptera: Ichneumonidae: Pimplinae) on Anelosimus baeza Agnarsson (Araneae: Theridiidae) in northeast Brazil, with a description of the male
FIGURE 2. Zatypota riverai Gauld, 1991: (A) habitus, female; (B) habitus, male; (C) subgenital plate (scale bar = 1 mm); (D) genitalia, lateral view (scale bar = 0.2 mm); (E) genitalia, ventral view (scale bar = 0.1 mm).
FIGURE 1. A in Parasitism of Zatypota riverai Gauld (Hymenoptera: Ichneumonidae: Pimplinae) on Anelosimus baeza Agnarsson (Araneae: Theridiidae) in northeast Brazil, with a description of the male
FIGURE 1. A) Adult female of Anelosimus baeza with a larva of Zatypota riverai attached to its abdomen. B) Three-dimensional web of A. baeza containing the parasitoid cocoon in its central region. Photographs: Jober Fernando Sobczak
Supplementary material 1 from: Agnarsson I, Jencik B, Veve G, Hanitriniaina S, Agostini D, Goh S, Pruitt J, Kuntner M (2015) Systematics of the Madagascar Anelosimus spiders: remarkable local richness and endemism, and dual colonization from the Americas. ZooKeys 509: 13-52. https://doi.org/10.3897/zookeys.509.8897
Data matrix: Explanation note: Data matrix set of five aligned and concatenated mtDNA and nuDNA loci.
FIGURES 2–11. 2–6 in Two new species of Baeus (Hymenoptera: Scelionidae) from South- eastern Brazil parasitoids of Anelosimus (Araneae: Theridiidae)
FIGURES 2–11. 2–6) Baeus anelosimus. 2) Female habitus, 3) female antenna, 4) male mandible, 5) male antenna, 6) male wing. 7–11) Baeus jabaquara. 7) Female habitus, 8) female antenna, 9) male antenna, 10) male wing, 11) male genitalia. Bar scales: a) 1 mm (Figs. 2, 7), or b) 0.05 mm (Figs. 3–6, 8–11).
Data from: Task specialization in two social spiders, Stegodyphus sarasinorum (Eresidae) and Anelosimus eximius (Theridiidae).
Understanding the social organization of group living organisms is crucial for the comprehension of the underlying selective mechanisms involved in the evolution of cooperation. Division of labour and caste formation is restricted to eusocial organisms, but behavioural asymmetries and reproductive skew is common in other group living animals. Permanently social spiders form highly related groups with reproductive skew and communal brood care. We investigated task differentiation in non-reproductive tasks in two permanently and independently derived social spider species asking the following questions: Do individual spiders vary consistently in their propensity to engage in prey attack? Are individual spiders' propensities to engage in web maintenance behaviour influenced by their previous engagement in prey attack? Interestingly, we found that both species showed some degree of task specialization, but in distinctly different ways: Stegodyphus sarasinorum, showed behavioural asymmetries at the individual level, i.e. individual spiders that had attacked prey once were more likely to attack prey again, independent of their body size or hunger level. In contrast, Anelosimus eximius showed no individual specialization, but showed differentiation according to life stage, where adult and subadult females were more likely to engage in prey attack than were juveniles. We found no evidence for division of labour between prey attack and web maintenance. Different solutions to achieve task differentiation in prey attack for the two species studied here suggest an adaptive value of task specialization in foraging for social spiders.
Sperm induction in the social spider Anelosimus jabaquara Levi, 1956 (Theridiidae)
<p>Movie file to accompany Sperm induction in the social spider Anelosimus jabaquara Levi, 1956 (Theridiidae), Arachnology 18(9).</p>
Data from: Task specialization in two social spiders, Stegodyphus sarasinorum (Eresidae) and Anelosimus eximius (Theridiidae).
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Data from: Limited role of character displacement in the coexistence of congeneric Anelosimus spiders in a Madagascan montane forest
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