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The black seadevil family, Melanocetidae and the genus name Melanocetus are a combination of melanos meaning "black" and cetus, which means a "large sea creature", typically used to refer to whales. [6] Günther did not explain this choice of name but did note the uniform black colour, including the inside of the mouth of M. johnsoni. [7]
One of the most important limiting factors for diving beetle occurrence is the presence of fish, which predate on the beetles (mostly on larvae), compete for food, and change the structure of the habitat. The presence or absence of fish can also affect habitat use and habitat selection of dytiscids.
Semi-, numerical prefix meaning "half" and sulcatus meaning “grooved” or "furrowed", which is in reference to the parallel grooves underneath the body of the beetle. It is commonly known as Brown-bellied Great Diving Beetle, [3] or Black bellied Great Diving Beetle. [4] [5] This is due to the dark colour of the under bellies of the beetles. [5]
This beetle is similar in structure to the better-known and widespread D. marginalis, but it is clearly larger and especially wider. The species is usually easy to recognize by the extensions on both sides of the shield. The elytra and the pronotum are dark brown with yellow sides. The head is black, while the legs are yellow. The male's wing ...
A water beetle is a generalized name for any beetle that is adapted to living in water at any point in its life cycle. Most water beetles can only live in fresh water, with a few marine species that live in the intertidal zone or littoral zone. There are approximately 2000 species of true water beetles native to lands throughout the world. [1]
Before silverfish reproduce, they carry out a ritual involving three phases, which may last over half an hour. In the first phase, the male and female stand face to face, their vibrating antennae touching, then repeatedly back off and return to this position. In the second phase, the male runs away and the female chases him.
The beetle species stands out within its fauna due to its large body size and metallic-black appearance, especially distinguished by its elytra that extends into a pointed shape. Its dorsal surface is between 8-11mm long and its ventral surface is adorned with stiff bristles. Their heads feature prominent eyes and lines across the forehand.
This beetle is among the largest aquatic insects. Adults can reach up to 5–5.15 cm (1.97–2.03 in) in length and 2.05 cm (0.81 in) in width. [3] [2] The larvae are up to 7 cm (2.8 in) long. The body of adults is black with a greenish or olive sheen. It has protruding eyes and reddish-black antennae. [2]