Overview
The Arrow Crab (Stenorhynchus seticornis) is a intermediate saltwater species known for its brown-tan, white/blue stripes, spider-like coloration. Spider-like. Surfaces.
Origin & Appearance
Origin: Caribbean.
Colors: Brown-Tan, White/Blue stripes, Spider-like.
Body Shape: Crab (wide carapace). Typical adult dimensions: 10.5 x 15.0 x 6.0.
Sexual Dimorphism: Moderate; males have narrower abdomen.
Tank & Water Requirements
| Min Tank Size | 30 gallons |
| Temperature | 75–81°F |
| pH Range | 8.1–8.4 |
| Water Hardness (GH) | dKH 8-12 |
| Bioload | low |
| Oxygen Demand | medium |
| Plant Safe | yes |
| Aquarium Position | Surfaces |
Behavior & Activity
Spider-like reef walker; long legs step over reef structure; hunts bristleworms at night; delicate walking
Speed: 20/100Aggression: 4/10diurnal
Breeding
Difficult; larvae need saltwater
Common Diseases
💊 Molt failure💊 bacterial
Expert Notes
Spider-like; eats bristleworms