Eresus Walckenaeri - Greek Ladybird Spider - Experienced Keepers Recommended - .25"

Mediterranean Ladybird Spider / Greek Velvet Spider

Revision Date: March 2025

Introduction

Eresus walckenaeri, also known as the Mediterranean Ladybird Spider, is one of the most visually striking spiders in the hobby. Males sport that unmistakable bright red abdomen with bold black spots, while females take on a more cryptic appearance, blending into their environment. Native to dry, rocky regions across the Mediterranean, these spiders have some interesting habits, balancing both burrowing and semi-arboreal tendencies. They create silk-lined retreats under rocks and in crevices but will also extend their web tunnels upwards, giving them a bit more range than your typical fossorial species.

While this care guide is focused on Eresus walckenaeri, the care recommendations here also apply to many other velvet spiders in the Eresidae family. If you are looking for care information on species like Eresus sandaliatus (European Ladybird Spider), Eresus kollari, Eresus moravicus, or even some lesser-known species like Eresus ruficapillus, you will find most of the same husbandry principles apply. Even species from the Stegodyphus genus, like Stegodyphus lineatus, share similar environmental needs, although their behavior and web-building techniques differ slightly.

These spiders are an exciting addition to the hobby, but they do have very specific care requirements. They thrive in dry, well-ventilated enclosures, and getting their setup right is key to long-term success. If you are considering keeping Eresus walckenaeri or any of its velvet spider relatives, this guide will give you everything you need to know to set them up for success.

Quick Species Snapshot

• Scientific Name: Eresus walckenaeri

• Common Names: Mediterranean Ladybird Spider, Velvet Spider, Greek Velvet Spider

• Type: Semi-Arboreal

• Category: Old World

• Native Range: Mediterranean regions, including Greece, Turkey, Cyprus, and parts of the Middle East

• Size: Body length up to 1 inch (2.5 cm); leg span up to 2 inches (5 cm)

• Venom Potency: Medically significant (painful bite, though not life-threatening)

• Growth Rate: Slow to moderate

• Life Expectancy: Females up to 8–10 years; males 2–3 years

• Recommended Experience Level: Intermediate to Advanced

Etymology & Taxonomic Notes

The genus Eresus belongs to the velvet spider family (Eresidae), a group of burrowing spiders known for their communal behaviors and unique coloration. The species name walckenaeri honors the French arachnologist Charles Walckenaer, who made significant contributions to spider taxonomy in the 19th century.

Natural Habitat & Unique Behaviors

Eresus walckenaeri is native to the dry, rocky regions of the Mediterranean, where it thrives in arid environments with sparse vegetation. These spiders build silk-lined burrows under stones, in soil crevices, or within plant roots. They reinforce these retreats with thick layers of webbing. Unlike fully fossorial species, they also display semi-arboreal tendencies and often use rocky ledges or elevated surfaces to extend their web tunnels and create reinforced retreats.

One of the most fascinating aspects of this species is its intricate web-building. Their burrows are not just shelters. They function as both defensive structures and hunting platforms. The entrance is often camouflaged with silk and debris, allowing the spider to ambush unsuspecting prey. A unique feature of their silk is its slight pinkish hue. It is subtle, but if you look closely, you can see a faint blush to their webbing, something rarely seen in other spiders. While the reason behind this coloration is not fully understood, it is an interesting trait that sets them apart.

In captivity, Eresus walckenaeri will replicate these burrow-style retreats but often take it a step further. Instead of staying on the ground, they extend their burrows upward, webbing tunnels along enclosure walls, cork bark, or other vertical surfaces. This is where their semi-arboreal tendencies really become obvious. Rather than staying hidden, they actively move around, reinforcing their silk structures and expanding their territory. Providing them with vertical anchor points like small branches or cork bark encourages these natural behaviors and makes for a fascinating display.

Another unique behavior seen in this species is matriphagy, where spiderlings consume their mother after hatching. While this may seem unsettling, it plays a crucial role in their survival by giving them vital nutrients needed for their early instars. This adaptation increases their chances of survival in the harsh Mediterranean climate.

Unlike most arachnids, Eresus walckenaeri is diurnal, meaning it is more active during daylight hours. Males are especially eye-catching with their bright red and black coloration, which serves as a warning signal to predators. Females are more cryptic, blending into their surroundings. Their high silk usage and constant web maintenance make them an incredibly interesting species to observe, both in the wild and in captivity.

Housing & Substrate – Semi-Arboreal Setup

Spiderlings

• Enclosure Size: Use a small acrylic enclosure (e.g., Sling Crib, Canopy Mini, Terrestrial Sling Crib) It is important that their enclosure have plenty of ventilation as a build up of humidity could be fatal. Make sure the ventilation holes are not too wide or the sling might squeeze out and escape. I recommend the OG Sling Crib as it is secure, well ventilated, and crystal clear.

• Substrate: Fill at least 1/3rd - 1/2 of the enclosure with DRY Terra Aranea by The Bio Dude. I like to sprinkle some Exo Terra Stone Desert on the surface, but that is not necessary.

• Humidity: The most important thing about keeping Eresus species is that they need to be kept dry. I mean bone dry substrate and no misting, no water dishes, nothing. They get all the moisture they require from their prey and humid conditions can be fatal to this species in captivity. DO NOT MIST!

• Additional Features: Excelsior makes for a great decoration for the velvet spider to use to anchor their web tunnels. They will burrow if you provide ample substrate, but they will also climb around to hunt and extend their burrow.