This pattern (i.e., old origin and more recent diversification) suggests a scenario of replacement in carnivory among polyneopterous insects.

Suidas’ system (the lunar system) is as follows: reckoning a round 30 days per lunar month, 1 saros ... = 222 lunar months ... rather than 3600 years, as in the solar system, the neros ... being one sixth of that ... instead of 600 years, as in the solar system, and the sossos ... one tenth of a neros ... instead of 60 years

The cold, during the winter night, is very severe, and the sentinels are frequently obliged to be relieved every half-hour, and the officers, so long as they possess the prima flora juvenus, may enjoy horizontal refreshments in peace; but when they obtained those manly appendages, yclept whiskers, find that turing in bed becomes hopeless, and being brought up with a round turn, discover that they have become frozen to the sheets.

I wanted to have a playdate today, but screw this, we could reschedule it for tomorrow.