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Etymology. The genus name is a composite of armo- (verb (L.) meaning providing ‘resistance’ or ‘defense’) and –dendrilla referring to the Dendrilla-like properties in combination with an armoured surface. The species name is in honour of the late Dame Patricia Bergquist. Comment. The holotype and paratype are registered in the collections of the Canterbury Museum, New Zealand, in a single lot under the lot number CMNZAQ1082, but the holotype is recognizable from the photo. These conditions satisfy ICZN Art. 16.4, and 72.3. Bergquist (1961: 215) described this species under the name ‘Dendrilla cactus (Selenka, 1867)’, but recognized later (Bergquist, 1996) that that species has no armoured surface. She suggested that a new genus should be erected, but this was not followed through. Chelonaplysilla De Laubenfels, 1948 is a second darwinellid genus possessing a surface armour, but its species have small sand grains arranged in a reticulate pattern, unlike the continuous armour in the present new genus. All other genera of Darwinellidae have an unarmoured surface.
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