Araneus (hairy field spider)
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> Araneomorpha > Family: Araneidae
Araneus, with 16 species listed for South Africa,
belongs to a group which shares many commonalities and is not easily separated
from Neoscona or Pararaneus. All three genera share the same
colloquial name.
Araneus sp. (possibly legonensis ??) occurs in the forested areas from the Table Mountain National Park
to Grootvadersbos Nature Reserve in the western Cape. It is similar in
appearance and habits to Araneus legonensis, a species that is
found from Ghana in west Africa to South Africa, and the Asian Araneus
mutificus. These two araneids are morphologically so distinct, and with
their unique
web and retreat structure, they may require a genus of their own. They are
small, 5-9mm body length, and all display similar colour patterns (green, white,
yellow, black and brown) but lack the black anterior edge to the abdomen of the
west African and Asian species. Superficially they remind one of the thomisid
genus Synema. The species at Grootvadersbos may be a separate one to that found
on the Cape Peninsula.
The orb-web, with the hub 0.8-2.8 m above ground level,
has a diameter of 50-200mm and a free sector of 20-25% of the web. From the hub
to the spider's retreat runs a "telegraph line" that informs the spiders of any
prey caught in the web. The retreat consists of a finely spun sheet of silk laid
across the upper surface of a leaf where she lays in waiting. This retreat
appears to protect the host from detection from spider hunting wasps and it was
even noticed that ants stay clear of an occupied retreat. Where the west African
spiders were found in park-like vegetation surrounded by coastal savanna the
western Cape spiders were all recorded in forested areas.
Text by Norman Larsen ©. |