---
title: "Common Eastern Ray Spider"
description: "Theridiosoma gemmosum — Insects & spiders. Theridiosoma gemmosum is a species of spider in the family Theridiosomatidae, known as ray spiders."
canonical: https://animalchecklist.com/animal/common-eastern-ray-spider
last_updated: 2026-09-20
---

# Common Eastern Ray Spider

> Theridiosoma gemmosum — Insects & spiders. Theridiosoma gemmosum is a species of spider in the family Theridiosomatidae, known as ray spiders.

- Scientific name: *Theridiosoma gemmosum*
- Category: `insects` (Insects & spiders)
- Habitats: unknown
- iNaturalist observations: 1850
- Wikidata: [Q244301](https://www.wikidata.org/wiki/Q244301)
- iNaturalist taxon: [153777](https://www.inaturalist.org/taxa/153777)

## Names

- en: Common Eastern Ray Spider
- de: Sumpfperlchen
- fr: Théridiosome précieuse
- nl: Moeraspareltje

## Countries with the most observations

US (352), CA (66), FR (41), AT (37), ES (17), DE (15), PL (14), DK (13), GB (11), RU (10), HU (4), IT (4)

## Summary

Theridiosoma gemmosum is a species of spider in the family Theridiosomatidae, known as ray spiders. It is widely distributed in the Holarctic region. A small spider with a shiny globular abdomen, it constructs a conical orb web.

Text: Wikipedia (en), CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Theridiosoma_gemmosum

## Photo

![Common Eastern Ray Spider](https://animalchecklist.com/img/animals/common-eastern-ray-spider/medium.jpg)

Photo: Adam Kranz · CC0 · inaturalist — https://www.inaturalist.org/observations/54183646

## Machine access

`GET https://animalchecklist.com/api/v1/animals/common-eastern-ray-spider?lang=en` — see [openapi.json](https://animalchecklist.com/openapi.json).