This situation causes terrible suffering to both Lancelet and Gwenhwyfar. In these ways, it differs from the modern lancelet. The positions (relationships) of the Lancelet, Tunicate, and Craniata clades are as reported. Branchiostoma lanceolatum (European lancelet, or Mediterranean amphioxus) is a lancelet in the subphylum Cephalochordata. TMEM151B could not be found in tunicates, but it was found in one lancelet. European lancelet ("Branchiostoma lanceolatum") "primitive fish". Branchiostoma floridae (the Florida lancelet) is a lancelet of the genus "Branchiostoma". The notochord of the lancelet protrudes beyond the anterior end of the neural tube. A digestive organ called the hepatic caecum is found in the cephalochordate amphioxus, or lancelet. It resembled the lancelet and perhaps swam much like an eel. The species least related to humans with a SKIDA1 ortholog is the lancelet "Branchiostoma belcheri". The lancelet notochord, unlike the vertebrate spine, extends into the head. Although Lancelet reciprocates Gwenhwyfar's love, he is also Arthur's friend and an honorable man. Lancelet makes Gwydion a knight of the Round Table, naming him Mordred.