The goblin spider genus Ischnothyreus (Araneae, Oonopidae) in Java and Sumatra

Area of Science:

• * Arachnology and Taxonomy
• * Biodiversity Research

Background:

• * The genus Ischnothyreus Simon, 1893, a group of goblin spiders, required taxonomic revision for Indonesian populations.
• * Previous knowledge of Ischnothyreus species in Java and Sumatra was limited, necessitating further systematic study.

Purpose of the Study:

• * To revise the genus Ischnothyreus from Java and Sumatra.
• * To describe new species and provide detailed morphological accounts of existing ones.
• * To contribute to the Planetary Biodiversity Inventory (PBI) of Oonopidae.

Main Methods:

• * Taxonomic revision based on morphological analysis of specimens from Java and Sumatra.
• * Description of 15 new species, including detailed illustrations and diagnostic features.
• * First-time description of the male of Ischnothyreus serpentinum and redescription of its female.

Main Results:

• * Description of seven new Ischnothyreus species from Java and eight new species from Sumatra.
• * Detailed morphological descriptions of male and female Ischnothyreus, highlighting unique features like trochanter projections, fused pedipalp segments, cheliceral fang base processes, and genitalic structures.
• * The male of Ischnothyreus serpentinum is described, and the female is redescribed.

Conclusions:

• * The revision significantly expands the known diversity of the genus Ischnothyreus in Southeast Asia.
• * Detailed morphological analysis provides insights into the evolutionary adaptations within the genus.
• * This work enhances the understanding of goblin spider biodiversity as part of the PBI.