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The decapod (crustaceans, such as a crab, lobster, shrimp or prawn) is made up of 20 body segments grouped into two main body parts: the cephalothorax and the pleon . [1] [2] Each segment may possess one pair of appendages, although in various groups these may be reduced or missing. They are, from head to tail:
In front of the pereiopods are three pairs of maxillipeds that function as feeding appendages. The head has five pairs of appendages, including mouthparts, antennae, and antennules. There are five more pairs of appendages on the abdomen. They are called pleopods. There is one final pair called uropods, which, with the telson, form the tail fan. [2]
The pair attached to the second segment are called secondary antennae or simply antennae. The second antennae are plesiomorphically biramous, but many species later evolved uniramous pairs. [ 2 ] The second antennae may be significantly reduced (e.g. remipedes) or apparently absent (e.g. barnacles ).
Copepods have six naupliar stages, followed by a stage called the copepodid, which has the same number of body segments and appendages in all copepods. The copepodid larva has two pairs of unsegmented swimming appendages, and an unsegmented "hind-body" comprising the thorax and the abdomen. [1]
R is a programming language for statistical computing and data visualization. It has been adopted in the fields of data mining, bioinformatics and data analysis. [9] The core R language is augmented by a large number of extension packages, containing reusable code, documentation, and sample data. R software is open-source and free software.
The tech sector is still recovering from the DeepSeek-driven sell-off last month, after investors panicked over fears of a cheaper open-source large language model. Opening Bid Podcast: how to ...
Kunyangella has 4 pairs of appendages on the head each with a distinct morphology, with 9 pairs of trunk appendages, the last being uniramous. [3] In Kunmingella, eggs have been found preserved attached to the posteriormost three pairs of biramous limbs, suggesting it engaged in brood care. Around 50–80 eggs, each around 150–180 μm across ...
When it comes to eating for heart health, it’s not always as simple as some foods are “bad” while others are “good.” These “bad” fats are worth a second look.