Cybaeidae

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Cybaeidae
Cybaeina minuta
Classificazione scientifica
DominioEukaryota
RegnoAnimalia
SottoregnoEumetazoa
SuperphylumProtostomia
PhylumArthropoda
SubphylumChelicerata
ClasseArachnida
OrdineAraneae
SottordineAraneomorphae
SuperfamigliaDictynoidea
FamigliaCybaeidae
Banks, 1892
Generi
vedi testo

Cybaeidae Banks, 1892 è una famiglia di ragni appartenente all'infraordine Araneomorphae.

Etimologia

Il nome deriva dal latino cybaea, cioè naviglio, costruzione che galleggia per la campana d'aria che alcune specie riescono a costruire sott'acqua, ed il suffisso -idae, che designa l'appartenenza ad una famiglia.

Ecologia

Sono ragni pressoché acquatici, vivono nelle acque stagnanti, e per respirare aria ne intrappolano uno strato sottile lungo i peli del proprio corpo, sia sull'addome che sulle gambe. Costruiscono anche una sorta di campana di aria con la loro tela impermeabile in modo da intrappolarvi una cospicua riserva di aria. Per ossigenare l'aria stessa nella campana la prende in superficie con ampi respiri e la porta giù.

Comunque il riempimento non deve avvenire di frequente in quanto la struttura della tela della campana consente un certo scambio osmotico fra l'ossigeno presente nell'acqua e l'anidride carbonica frutto del respiro del ragno. È un sistema alquanto efficiente sul quale si basano alcuni moderni respiratori per sub.

Cybaeidae- distribuzione
Cryphoeca silvicola

Caratteristiche

I ragni di questa famiglia sono sprovvisti di cribellum, hanno le filiere della stessa lunghezza, lo stigma tracheale posizionato anteriormente e il III e il IV paio di zampe con peli più lunghi e differenti.

Distribuzione

Sono diffusi ampiamente nella regione olartica; rinvenuti anche nell'isola di Sumatra, in Colombia, Venezuela e Perù[1].

Tassonomia

Attualmente, a novembre 2020, si compone di 20 generi e 268 specie[1]:

Generi trasferiti, inglobati, non più in uso

Generi fossili

Note

  1. ^ a b World Spider Catalogue, versione 21.5, Famiglie di ragni, con numero di generi e specie URL consultato il 27 novembre 2020, su wsc.nmbe.ch.
  2. ^ a b Genere inglobato in Cybaeus per sinonimia da uno studio dell'aracnologo Ihara del 2010

Bibliografia

  • Banks, 1892 - A classification of North American spiders. Canadian Entomologist, vol.24, p.88-97.

Voci correlate

Altri progetti

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