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What is the difference between pinnate palm leaves and palmate palm leaves?

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Dense grove of acai palm trees (Euterpe oleracea) with slender trunks and abundant green fronds growing on Combu Island in Belem, Para, Brazil. — Palm Wild acai palms (*Euterpe oleracea*) growing on Combu Island in Belem, state of Para in Brazil.

The primary difference between pinnate and palmate palm leaves lies in their structural arrangement and shape:

Pinnate leaves: These are described as featherlike. They possess distinct leaflets (pinnae) arranged along a central axis, or they may be bipinnate or simply pinnately veined.1
Palmate leaves: These are fanlike in appearance. In this type, the leaf segments radiate outward from a central region located at the tip of the petiole (leafstalk).1

Some palmate leaves are further categorized as costapalmate if they feature relatively elongate central veins or ribs. Additionally, many palmate and costapalmate leaves possess a prominent ridge of tissue at the apex of the petiole known as a hastula.1