Alexandre G's

Your project was interesting (and quite unusual), with hardly any mistakes in the texts. However, you should have made it more "personal". I know you carried out a lot of research to do the work on this page but your texts should be entirely written by yourself and not "taken" directly from some website or written by someone who speaks perfect English !

Your mark is 13/20

Vampire crabs

Introduction :


The Geosesarma dennerle, more commonly known as the vampire crab, is a dwarf crab native to Oceania.

This crab began to be known to the aquarium world (world of fans and professionals of aquariums and the species they contain) in 2006 and its geographical origin remained unclear for several years. Officially described in 2015, it was renamed Geosarma dennerle following Dennerle’s enterprise public participation in the research.

Populations of the vampire crab are located in Oceania and have suffered from its popularity. The unsuspecting species inhabits a rainforest stream in Java, Indonesia. It is therefore threatened in its natural environment.

Mainly carnivorous, this mini-predator surprises by the speed with which it can hunt insects and larvae crossing its path.

Who is he ?

The morphology of vampire crabs :


The crab always has five pairs of legs, the first pair of which is turned into claws.

The vampire crab measures between 20 and 22 mm. Due to its small size, it is classified in the group of «dwarf crabs». In addition, this species of crab generally has a purple shell and yellow/orange eyes.

Lifestyle and behaviour :

These small nocturnal crabs live among the dense vegetation, under and between the rocks. They are found near streams, and can sometimes burrow in soft soil.

These crabs are mostly on the surface and feed on small insects, such as grasshoppers, as well as the larvae of various animals, but they are also found underwater.

Like all crustaceans, the vampire crab moults whenever it finds itself cramped in he's its shell. Before he's its new body hardens, he's it's more vulnerable and spends a good part of he's its time in hiding, and it's also during the moulting period that females become fertile.

Mode of reproductions

The breeding period in vampire crabs occurs when the female crab moults and keeps the eggs under her abdomen once laid. One of the advantages of this crab is that it can do without water to live and therefore does not depend on the surrounding waters for reproduction.

Where do you find this species ?


This species lives exclusively near small tropical streams, between rocks or in burrows. The environment is tropical, characterized by high humidity (80% on average), high ambient temperatures (between 23 and 26°C) and dense vegetation. This environment is particularly rich in insects, which are generally hunted by the vampire crab.

Their ecological role in their environment is not neglligible. In fact, they participate in the sanitation of their environment by recycling nutrients from decaying plants.

(click on the picture to see better)

Thanks you for reading me


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