80a. The front is prominent, nearly straight or bilobed; the carapace is pentagonal. The abdomen of the male has a very elongate telson, its length more that twice that of the greatest length of the other abdominal segments. There are no endostomial crests.
Subfamilia Halimedinae
80b. The front is normal; the xanthoid carapace is not much broader than long and dorsally convex, sometimes globular or transversely oval, much broader than long and dorsally flattened.