Gradungulidae

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Gradungulidae
Gradungula sorenseni, maschio adulto
Classificazione scientifica
DominioEukaryota
RegnoAnimalia
SottoregnoEumetazoa
SuperphylumProtostomia
PhylumArthropoda
SubphylumChelicerata
ClasseArachnida
OrdineAraneae
SottordineAraneomorphae
SuperfamigliaAustrochiloidea
FamigliaGradungulidae
Forster, 1955
Generi

Gradungulidae Forster, 1955 è una famiglia di ragni appartenente all'infraordine Araneomorphae.

Etimologia

Il nome deriva probabilmente dal latino gradus cioè graduato, scalettato, e ungula, cioè piccola unghia, artiglio, a causa della conformazione dell'ultimo segmento delle zampe anteriori, ed il suffisso -idae, che designa l'appartenenza ad una famiglia.

Caratteristiche

Sono ragni di colore bruno sul carapace con zampe a bande di colori alterni. Hanno due paia di polmoni a libro, costituiti da minute lamelle attraverso le quali scorre l'emolinfa che consente loro scambi gassosi per ossigenarsi. Sono sprovvisti di cribellum, tranne le specie del genere Progradungula, che sono anche i rappresentanti di maggiori dimensioni della famiglia con le loro lunghe zampe, assomigliando molto agli appartenenti il genere Hickmania della famiglia Austrochilidae.

Comportamento

Vivono in foreste e boschi dove costruiscono estese ragnatele con un punto d'appoggio a terra e grovigli di fili estesi in tutte le direzioni nel fogliame.

Distribuzione

Le famiglie sono distribuite fra la metà occidentale dell'Australia e in Nuova Zelanda

Gradungulidae - distribuzione

Tassonomia

Attualmente, a novembre 2020, si compone di 7 generi e 16 specie[1]:

Note

  1. ^ World Spider Catalogue, versione 21.5, Famiglie di ragni, con numero di generi e specie URL consultato il 29 novembre 2020, su wsc.nmbe.ch. URL consultato il 28 febbraio 2015 (archiviato dall'url originale l'11 luglio 2017).

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