Kumo Kumo no Mi, Model: Rosamygale Grauvogeli

The Kumo Kumo no Mi, Model: Rosamygale Grauvogeli is an Ancient Zoan-type Devil Fruit that allows the user to transform into a hybrid and full version of a Rosamygale grauvogeli, a spider from the Triassic period. It was eaten by Black Maria.

Etymology

 * "Kumo" (蜘蛛) is Japanese for "spider".
 * Rosamygale grauvogeli is a Latin name which means "Grauvogel's Rose bird-eating spider".

Strengths and Weaknesses
The user of this fruit gains the abilities of a spider, most notably the ability to shoot webs out of their body; these webs are strong enough to easily trap and capture even powerful fighters like Sanji. Additionally, the user can walk on walls and ceilings with their spider legs. Although the real-life Rosamygale grauvogeli was under a centimeter in size, this fruit's transformation appears to be proportionate to the size of the user's body, which in Black Maria's case causes it to dwarf normal-sized humans. No weaknesses of the fruit are known aside from the standard Devil Fruit weaknesses.

This fruit's hybrid form seems to be rather unusual compared to other Zoans, as instead of the user retaining a humanoid body with animal alterations, their upper body remains human while their legs appear to transform into an entire spider, which possesses its own face that is remarkably humanoid. Such a transformation is quite similar in appearance to those of artificial SMILE fruit users, though unlike them, the user of this fruit can activate and deactivate it as they please.

Usage
Black Maria uses this fruit for devising traps and general combat, being capable of trapping unsuspecting opponents with her webs and leaving them vulnerable to attack.

Trivia

 * This is so far the only Zoan Devil Fruit that utilizes a species' scientific name as part of its denomination.
 * The Rosamygale were believed to have caught food by remaining in their habitat and laying their webs to trap animals coming near it, rather than going out and actively hunting prey. This resembles Black Maria's behavior shown so far, where she elected to remain in a room in Kaido's fortress and captured Sanji when he entered it rather than actively hunting Kaido's enemies.
 * This fruit coupled with Black Maria's general character could be a reference to the mythical Jorogumo, a spider-like yokai capable of shapeshifting into a woman whose beauty is used to lure and then capture men as prey.