Are you struggling to determine the sex of your new arachnid friend? Understanding the differences in Bold Jumping Spider male vs female (Phidippus audax) anatomy is one of the most exciting parts of the hobby. Whether you are planning to breed them or just want to pick the right name, accurate identification is key.
Unlike their cousins the Regal Jumping Spiders, the Phidippus audax is monomorphic. This means both sexes are predominantly black with white spots. This similarity makes the Bold Jumping Spider male vs female comparison tricky for beginners. In this guide, we will cover the definitive methods to sex your spider like a pro.
⚡ Quick Answer: How to Sex a Bold Jumping Spider
The most reliable way to sex a Phidippus audax is by examining the pedipalps (the small feelers next to the fangs):
- Male ♂: Pedipalps have swollen, bulbous tips that look like “boxing gloves” or commas.
- Female ♀: Pedipalps are straight, thin, and fluffy from top to bottom (like pipe cleaners).
- Adult Confirmation: Mature females have a shiny “belly button” spot (epigynum) on their underside; males do not.
Bold Jumping Spider Male vs Female Comparison Table
- 📊 Quick Comparison Table
- 🥊 Method 1: Pedipalps (The “Boxing Gloves”)
- 🧿 Method 2: Epigynum (The “Belly Button”)
- 🕷️ Method 3: Body Shape Differences
- 🎨 Myth Buster: Green vs. Pink Fangs
- ❓ FAQ: Common Questions
In this comprehensive guide, we will dive deep into the anatomy, debunk the “fang color” myth, and provide detailed descriptions to help you become an expert at sexing your spider.
📊 Quick Comparison Table
Before diving into the microscopic details, here is a quick overview of the Bold Jumping Spider male vs female physical traits you need to look for.
| Feature | Male (P. audax) ♂ | Female (P. audax) ♀ |
|---|---|---|
| Pedipalps | Bulbous tips (“Boxing Gloves”) |
Uniform thickness (Straight & Fluffy) |
| Underside | Smooth surface | Visible Epigynum (“Belly Button”) |
| Abdomen | Narrow, oval, athletic | Broad, rounded, teardrop |
| Front Legs | Longer (for dancing) | Proportional |
Once you know the sex, you can set up the perfect home. Check our Habitat Guides for inspiration.
🥊 Method 1: The Pedipalps (Boxing Gloves)
The most accurate method for sub-adults and adults involves checking the pedipalps (or “palps”). When analyzing the Bold Jumping Spider male vs female differences, the pedipalps are the giveaway.
The pedipalps are the two small appendages at the front of the spider’s face. While they look like mini-legs, they serve a reproductive function in males.
The Male Look ♂
As a male reaches maturity (sub-adult instars), the tips of his pedipalps swell up to store sperm. In the hobby, we call this the “Boxing Glove” look. From the side, they often look like a comma shape.
The Female Look ♀
Female pedipalps are strictly for sensory use. They remain thin and straight. If your spider’s palps look like fluffy feather dusters with no bulb at the end, it is likely a female.
🧿 Method 2: The Epigynum (Belly Button)
Accuracy: 100% (Mature Adults Only)
If your spider is fully grown, the most definitive test is to check the underside (ventral view). You can do this by putting the spider in a clear cup and looking from below.
- Female: Possesses an external genital structure called the Epigynum. It is a small, hardened, shiny black plate located between the book lungs. It looks exactly like a tiny belly button.
- Male: The belly area is smooth and uniform. There is no shiny plate.
Mature females need plenty of food to produce eggs. Make sure you read our Feeding Guide.
🕷️ Method 3: Body Shape DifferencesBelly Button)
While diet affects size, biology dictates shape.
- Females (The Tank): Built to carry eggs. Their abdomens are typically rounder and larger.
- Males (The Athlete): Built for travel. Their abdomens are slender and oval. They also tend to have longer front legs (Leg Pair I), which they use to wave at females during mating dances.
🎨 Myth Buster: Green vs. Pink Fangs
STOP! Do not judge by color alone.
There is a rumor that “Green Fangs = Male” and “Pink Fangs = Female.” This is FALSE for Bold Jumping Spiders.
While this rule works for Regal Jumping Spiders, the Phidippus audax is different. Both males and females often have iridescent green, blue, or violet chelicerae. Never rely on fang color alone to sex this species.