There is something that bothers me about the following sentence:

Alongside the ship careened by the tropical shore, a group of pirates buried beneath a coconut tree.

Ok. Not a great sentence, but one from which I want to ask a question. In this sentence, we expect the pirates to be burying something, but there is no direct object in the sentence. Transitive verbs can take direct objects, but what do you call a verb that must take a direct object? In other words, if the verb is not followed by a direct object, the sentence sounds awkward or not quite finished because the verb lacks an object. I don't think 'buried' a very good example, but I can't think of a verb that is precisely what I want right now. If I think of a better example, I will return.

Question again: Transitive verbs can take direct objects; what do we call verbs that must take a direct object in order to be correctly and grammatically used in sentences?