. The Echo . Figure 2. Two basic radular types in the Muricinae: (a) "normal muricine" type; (b) "3-D" type. The Ocenebrinae have a radula very close to that of the "3-D" type, and, therefore, it is asstimed that the subfamily Ocenebrinae probably was an offshoot from this side of the Muricinae family tree. The nature of the early whorls in the Ocenebrinae is also much like those in the Murexiella-Murexsul group, further strengthening this supposition. There are numer- ous points of resemblance, which might be expected from the fact that many of the species in the
. The Echo . Figure 2. Two basic radular types in the Muricinae: (a) "normal muricine" type; (b) "3-D" type. The Ocenebrinae have a radula very close to that of the "3-D" type, and, therefore, it is asstimed that the subfamily Ocenebrinae probably was an offshoot from this side of the Muricinae family tree. The nature of the early whorls in the Ocenebrinae is also much like those in the Murexiella-Murexsul group, further strengthening this supposition. There are numer- ous points of resemblance, which might be expected from the fact that many of the species in the Murexiella group have been referred to Ocenebra by authors. However, there are some very strong points of dissimilarity, which justify the separation of the two originally closely related lines into two different subfamilies. Systematic paleontologists are fond of constructing "phylo- genetic trees" and, indeed, I have been asked by certain profes- sors in the past, if I could derive such a structure for the Muricinae. The answer is that there is no such thing as a "phylogenetic ; It has been suggested by some that it would be better called a "reticulum" or net. I believe in the kl
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