Arrowhead Crab

(1 customer review)

£19.00

8-10cm

The Arrowhead Crab, Stenorhynchus seticornis

  • Common Name: Arrowhead Crab
  • Latin Name: Stenorhynchus seticornis
  • Distribution: Found in shallow coastal waters of the Western Atlantic Ocean, from the southeastern United States to Central and South America.
  • Max Size: Up to 1.5 inches (3.8 centimetres).
  • Temperature Range: 72-78°F (22-26°C).
  • pH Range: 8.1-8.4.
  • KH Range: 7-12
  • Care Level: Moderate.
  • Lighting Preference: Dimly lit aquariums.
  • Preferred Food: Omnivorous diet including meaty foods and detritus.
  • Behaviour: Peaceful but opportunistic feeder, may pose a risk to small, slow-moving tank inhabitants if hungry.
  • Suitable for Reef Tanks: Yes, but may consume small invertebrates.
  • Interesting Facts: Arrowhead Crabs are valued for their ability to eat bristleworms, aiding in pest control in aquariums. They have distinctive arrow-shaped body and elongated spindly legs.

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The Arrowhead Crab, scientifically known as Stenorhynchus seticornis, can grow up to 1.5 inches (3.8 centimetres). They have a distinct arrow-shaped body with long spindly legs.

Why Keep Arrowhead Crabs?

People enjoy keeping crabs in aquariums for various reasons. Firstly, they add diversity to the tank, creating a more dynamic and interesting environment. Observing their behaviours and interactions can be fascinating. Crabs also serve a practical purpose by helping to clean up leftover detritus, contributing to its overall cleanliness.

Aquarists value Arrowhead Crabs in particular for their ability to eat bristleworms, a common pest in aquariums. They also add visual interest thanks to their quirky appearance.

Taxonomy

The Arrowhead Crab, scientifically known as Stenorhynchus seticornis, belongs to the family Majidae within the order Decapoda. Decapods are characterized by their ten legs, including eight walking legs and two specialized appendages known as chelipeds or claws.

The family Majidae, commonly referred to as spider crabs or decorator crabs, is distinguished by their flattened bodies and long, slender legs, which aid in their camouflage among aquatic vegetation and substrate.

The genus Stenorhynchus is characterized by its distinctive arrowhead-shaped carapace, which gives the Arrowhead Crab its common name. The species epithet seticornis is derived from Latin, with “seti” meaning bristle and “cornis” referring to the antennae. This likely alludes to the presence of bristle-like structures on the crab’s antennae or other parts of its body.

Natural Habitat

The natural habitat of the Arrowhead Crab, Stenorhynchus seticornis, primarily consists of shallow coastal waters in tropical and subtropical regions of the Western Atlantic Ocean. These crabs are commonly found in coral reefs, seagrass beds, and rocky substrates, where they can effectively camouflage themselves among the diverse marine flora and fauna.

Their distribution spans from the southeastern United States, including Florida and the Gulf of Mexico, down through the Caribbean Sea and into parts of Central and South America. Within this range, they may exhibit localized variations in abundance and habitat preferences based on factors such as water temperature, substrate composition, and prey availability.

Keeping Arrowhead Crabs Healthy

Maintaining the health of Arrowhead Crabs (Stenorhynchus seticornis) in an aquarium requires attention to several key factors. These crabs have a moderate care level, but ensuring their well-being involves providing appropriate habitat conditions and diet.

Arrowhead Crabs thrive in aquariums with ample hiding spots such as caves, rocks formations mimicking their natural habitat. A tank size of at least 20 gallons (75 litres) is recommended to accommodate their active nature. Maintain stable water parameters including temperature between 72-78°F (22-26°C), pH of 8.1-8.4, and specific gravity around 1.023-1.025. Regularly monitor water parameters, perform routine water changes, and clean the tank to ensure optimal water quality.

These crabs maybe scavengers but will need to be fed and not left to depend on detritus. They will eat meaty foods that can be target feed to them or introduced to the aquarium floor with a feeding tube.

Arrowhead Crabs undergo moulting to grow, shedding their old exoskeleton and forming a new one. During this vulnerable period, calcium supplements can be very helpful to aid in the formation of the new exoskeleton.

Suitable Tank Mates

Predatory fish such as puffers, Groupers and large wrasse can pose a risk to these critters.

These crabs are opportunistic feeders and may pose a risk to small, slow-moving tank inhabitants if they are hungry enough. Feel free to give us a call with any compatibility concerns you may have.

How Many Should I Keep?

It can be possible to keep more than crab in your aquarium but this will depend on afew variables such as tank size, and territories within the tank. we recommend giving us a call if considering keeping more than one.

Lighting Preference

Arrowhead Crabs prefer dimly lit aquariums to mimic their natural habitat.

Sexual Dimorphism

Sexes are visually similar, making it challenging to distinguish between males and females.

Male Arrowhead Crabs typically have a narrower and more triangular-shaped carapace compared to females. The frontal region of the carapace, known as the rostrum, tends to be longer and more pronounced in males, often exhibiting a sharper point or projection. Additionally, male crabs may have slightly larger chelipeds or claws compared to females, though this characteristic alone may not be definitive for sex determination.

Female Arrowhead Crabs generally have a broader and more rounded carapace compared to males. The rostrum is typically shorter and less pronounced, with a smoother curvature along the frontal region of the carapace. While females may have smaller chelipeds relative to males, this feature alone may not reliably distinguish between the sexes.

Summary

The Arrowhead Crab, scientifically known as Stenorhynchus seticornis, is an intriguing species, characterized by its distinctive arrow-shaped body and elongated spindly legs. Aquarists are drawn to keeping these crabs in their tanks for their ability to eat bristleworms, common aquarium pests which can irritate the skin on contact. Taxonomically, these crabs belong to the family Majidae within the order Decapoda, characterized by their unique morphology and habitat preferences. Their natural habitat primarily encompasses shallow coastal waters in the Western Atlantic Ocean, including coral reefs, seagrass beds, and rocky substrates. To ensure the health and well-being of Arrowhead Crabs in aquariums, careful attention must be paid to maintaining stable water parameters, providing suitable hiding spots, and offering a balanced diet. It can be risky to keep arrowhead crabs with slow moving, small animals and large predators. Feel free to ask for advice if necessary.

1 review for Arrowhead Crab

  1. J Tee (verified owner)

    Mine arrived looking healthy. I acclimated it slowly to the new tank water over two hours before introduction. It seems happy as far as I can tell and is wandering about and eating.

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Dry Goods Delivery.

The store has provided information regarding their order dispatch and estimated delivery times. Here are the key details:

  1. Dispatch Timeframe: Orders placed before 2pm will be dispatched on the same day. Orders placed after 2pm will be dispatched on the next working day.
  2. Delivery Date and Time Guarantee: While the store aims to dispatch orders promptly, they cannot guarantee a specific delivery date and time. As the delivery process relies on couriers, there may be factors beyond their control that could affect the delivery timeframe.
  3. 1st Class Mail: For orders sent via 1st Class mail, the aim is to have them delivered on the next working day after dispatch.
  4. 2nd Class Mail: Orders sent via 2nd Class mail typically take approximately 2-3 working days for delivery after dispatch.
  5. APC Next Day Delivery: APC Next Day delivery is available for UK mainland postcodes. It is usually delivered on the next working day after dispatch. However, please note that items being delivered to more remote areas may require additional time for delivery.

It’s important to keep in mind that while the store strives to provide efficient delivery services, unforeseen circumstances or external factors could potentially impact delivery times. For further details or specific inquiries about delivery, customers should refer to the store’s terms and conditions or contact the store directly.

Livestock Delivery.

The store maintains specific policies regarding the delivery of livestock. Here are the key points:

  1. Licensed Livestock Courier: The store exclusively uses a licensed livestock courier for shipping fish and coral. This approach is chosen to ensure responsible and ethical transportation of the livestock.
  2. Livestock Shipping Fee: The livestock shipping fee charged to customers of £19.99 does not cover the true cost, and therefore, there is a minimum spend requirement of £30.00 before the option for livestock shipping becomes available.
  3. Pre-Arranged Delivery: The store never ships livestock without first arranging a suitable delivery day. Before dispatching the livestock, the store must confirm the agreed-upon delivery day with the customer.
  4. Saturday Delivery Confirmation: Customers who choose Saturday delivery must have their availability confirmed for the upcoming Saturday before the store sends out the livestock. This confirmation ensures that the livestock can be received promptly.
  5. Failure to wait for livestock: Not waiting for livestock, even if there is a reasonable delay, or cancelling an order after it has been dispatched will lead to you incurring charges for an emergency return to the base. Additionally, any losses of livestock will also be charged to you. Please be aware that the items you are ordering are living creatures – livestock. We kindly ask that you refrain from ordering livestock if you are unable to accommodate the possibility of a delayed delivery.

    These terms and conditions are a fundamental aspect of our policy. Our primary goal is to dissuade individuals who could react negatively to a delayed delivery and subsequently request order cancellations. It is of utmost importance to underscore that your order pertains to living creatures, not mere inanimate objects. In the event of an occasional delay, it is crucial that you respond in a rational and responsible manner, taking into account the welfare of the livestock. We kindly request that you refrain from placing an order for livestock if you tend to react strongly to such situations. By proceeding with the order of livestock, you indicate your acceptance and agreement to abide by these specified terms and conditions.

  6. Signature Requirement: Livestock deliveries require a signature upon receipt and cannot be left in a safe location. This precaution ensures proper handling and the well-being of the livestock.
  7. Geographic Restrictions: The courier has strict geographic restrictions for livestock deliveries. Unfortunately, deliveries to Northern Ireland, Republic of Ireland, Isle of Man, Isles of Scilly, Channel Islands, and certain Scottish offshore postcodes may not be possible. Customers are encouraged to contact the store via email to confirm if livestock delivery is available in their area.
  8. Minimum Order Value and Order Cancellations: The store has a minimum order value of £30 for livestock shipping. Additionally, the store reserves the right to cancel orders that are deemed high-risk or involve a high number of single tropical freshwater fish species.

It is essential for customers to familiarize themselves with these policies before making a purchase. For more detailed information or specific inquiries, customers should consult the store’s terms and conditions or reach out to the store directly for clarification.

Livestock Geographical Exemptions.

The store has specific geographical exemptions for livestock deliveries. Here is a list of the areas and postcodes where livestock delivery is not available:

  1. Islands: Livestock cannot be delivered to the Shetlands, Channel Islands, and Isle of Man.
  2. Postcodes: Livestock delivery is not available to the following postcodes:
  • AB30 to AB39, AB41 to AB45, AB51 to AB56
  • DD8 to DD10
  • BT all
  • DG3 to DG9, DG12 to DG14
  • KA18 to KA19, KA26, KA29 to KA30
  • HS all
  • IM all
  • JE all
  • ZE all
  • KW15 to KW17
  • TD9
  • FK17 to FK21
  • GY all
  • KA26, to KA28
  • PA20 to PA38, PA41 to PA49, PA60 to PA61, PA76 to PA78
  • TR21, to TR25
  • PH3 to PH26, PH30 to PH44
  • IV all

Customers residing in these areas should be aware that livestock delivery is not available to their location.

We can ship livestock to the Isle of Wight, this area is subject to a surcharge.

For further information or specific inquiries about livestock delivery to a particular area, customers are advised to contact the store directly for clarification.

Cancellation.

According to the store’s policy, customers have the right to cancel an order within 14 working days of receiving the goods. To initiate the cancellation, the goods must be returned to the store in new and unused condition, adhering to their Returns Policy.

Important points regarding the return process are as follows:

  1. Return Condition: The goods must be returned in new and unused condition, as originally received. It is important to ensure that the goods are in the same condition as when they were sent out.
  2. Return Timeframe: The goods must be received by the store within 21 days of notifying them about the cancellation. During this time, customers are responsible for any loss or damage that may occur during the return shipping process.
  3. Refund Process: Once the store receives the goods in new and unused condition, they will initiate the refund process. The purchase price will be refunded to the customer.
  4. Return Condition Inspection: If the returned goods arrive in a condition that is less than what they were sent out in, the store reserves the right to return the goods to the customer, and no refund will be processed.

It is essential for customers to carefully review the store’s Returns Policy and follow the specified procedures to ensure a smooth and successful return and refund process. For more detailed information or specific inquiries, customers should consult the store’s terms and conditions or contact the store directly.

Returns.

According to the store’s return policy, the following guidelines should be followed for returning goods:

  1. Use Returns Form: Customers need to use the store’s provided returns form to initiate the return process. This form helps the store acknowledge that the goods are being sent back.
  2. Return for Testing: If the goods are being returned for testing, the customer is responsible for covering the return shipping expenses.
  3. Refund of Postage Fees: The store will only refund postage fees if the order arrives damaged or becomes faulty within the first 4 weeks of purchase. Proof of posting is important, and customers should ensure the goods are well-packed and obtain proof of posting as the goods remain their responsibility until received by the store.
  4. Refund of Postage Costs for Replacement: If goods are being returned within 7 days of purchase under the Replacement Policy, the store can refund postage costs. However, the customer needs to agree on a delivery service with the store in advance, and only standard or tracked shipping fees will be refunded. The store cannot refund the cost of any special delivery service.
  5. Non-Refundable Postage: Postage costs for goods returned for any other reason than those mentioned above are non-refundable. The store reserves the right to deduct the original postage cost from any applicable refund.
  6. Mistaken Purchases: If a customer has made a mistake in their purchase, they need to return the goods to the store. The customer is responsible for the return shipping costs in such cases.

It is important for customers to carefully follow the store’s return procedures and terms and conditions. For further details or specific inquiries, customers should refer to the store’s website or contact the store directly.

Replacements

If customers receive faulty goods, the following guidelines apply according to the store’s policy:

  1. Notification of Faulty Goods: Customers must notify the store within 7 working days if they receive faulty goods. This notification should be made as soon as possible.
  2. Replacement Parts: If possible, the store will dispatch replacement parts for the faulty goods.
  3. Return of Goods: If replacement parts are not possible, the store may request customers to return the faulty goods in accordance with their Returns Policy. The specific return procedures and conditions should be followed.
  4. Verification of Damage: Once the store receives the returned goods, they will verify the damage. If the damage is confirmed, the store will supply the required replacements.
  5. Return Postage Costs: If the goods returned to the store are found to be in good working order, the store is not able to refund the return postage costs. Additionally, the store reserves the right to deduct their original postage cost from any applicable refund.
  6. Consequential Loss or Damage: The store cannot take responsibility for any consequential loss or damage that arises directly or indirectly from the goods supplied.

Customers should carefully review and adhere to the store’s Returns Policy and procedures for returning faulty goods. For further clarification or specific inquiries, customers should consult the store’s terms and conditions or contact the store directly.

Manufacturer’s Guarantees

The store works in collaboration with manufacturers to ensure that their guarantees are honored, and they make their best efforts to resolve issues within the warranty period. The following guidelines apply to refunds and replacements:

  1. Postage Costs under Manufacturer’s Guarantee: Postage costs can only be refunded if the goods are returned to the store within 7 days of the original purchase, as per the manufacturer’s guarantee.
  2. Refund of Postage Costs for Faulty Goods: The store will refund postage costs for guarantee/warranty returns only if the product becomes faulty within the first 4 weeks of receipt.
  3. Replacements with Manufacturer Authorization: Replacements, whether parts or goods, can only be offered when authorized by the manufacturer. Customers should contact the store for further guidance in such cases.
  4. Prior Approval for Returns: Goods should not be returned to the store without prior approval. Customers need to contact the store and obtain approval before returning any items.
  5. Replacement of Glass or Ceramic Items: Glass or ceramic items can only be replaced if the store is notified within 48 hours of receiving the delivery.
  6. Replacement of Glass Bulbs/Tubes: Glass bulbs or tubes can only be replaced if they become faulty within 14 days.

Customers should note and adhere to these guidelines to ensure a smooth and efficient resolution of any issues with their purchased items. For specific inquiries or further information, customers are advised to refer to the store’s terms and conditions or contact the store directly.

Breakages

According to the store’s policy, customers have the following responsibilities regarding breakages:

  1. Checking Goods on Arrival: It is the customer’s responsibility to thoroughly check the goods upon arrival for any damage. This should be done before signing for the parcel. If the parcel appears damaged, it is advised not to sign for it.
  2. Reporting Breakages: Any breakages or damages must be reported to the store within 48 hours of receiving the goods. It is important to promptly notify the store to initiate the resolution process.

By carefully inspecting the goods upon arrival and reporting any breakages within the specified timeframe, customers can ensure that appropriate actions are taken to address the issue. For specific instructions on reporting breakages or further information, customers should refer to the store’s terms and conditions or contact the store directly.