Two new species and a new genus of ray spiders (Araneae, Theridiosomatidae) from the Ryukyu Islands, southwest Japan, with notes on their natural history

By

Suzuki, Yuya
Hiramatsu, Takehisa
Tatsuta, Haruki

Type

Article

Date of Publication

2022

Original Publication

ZooKeys

Volume

1109

Pages

67--101

Subjects

Araneoidea , embolic apophysis , Iriomote Island , limestone cave , new combination , Okinawa Island , orb web , taxonomy

Contributed by

Pensoft Publishers

Language

English

Published by

Sofia, Bulgaria Pensoft Publishers

Identifiers

DOI: https://doi.org/10.3897/zookeys.1109.83807

 

Abstract

This paper provides descriptions of two new theridiosomatid species, Theridiosoma nigrivirgatumsp. nov. and Sennin tanikawaigen. nov., sp. nov. from the Ryukyu Islands, southwest Japan, with photographs and illustrations of both sexes. Senningen. nov. is a troglophilic genus composed of two species, S. tanikawaisp. nov. (Iriomote Island, Japan) and S. coddingtoni (Zhu, Zhang & Chen, 2001), comb. nov. (southern China). Zoma dibaiyin Miller, Griswold & Yin, 2009, which recently joined the Japanese fauna, was morphologically reexamined based on specimens from the Ryukyus, and taxonomic features of Zoma males were reassessed. A distributional map of theridiosomatid spiders in the Ryukyus is also provided, including T. dissimulatum Suzuki, Serita & Hiramatsu, 2020, and T. alboannulatum Suzuki, Serita & Hiramatsu, 2020 with their habitat types, web morphology, and web-building behavior in detail.