Poicarcinia, Cardoso & Bento & Ferreira, 2025

Cardoso, Giovanna Monticelli, Bento, Diego de Medeiros & Ferreira, Rodrigo Lopes, 2025, Remnants of an ancient world: three new genera and three new species of Calabozoidea isopods from Brazilian semi-arid caves (Crustacea: Isopoda), Tropical Zoology (trop. Zool.) 38 (1 - 2), pp. 1-25 : 16

Genus Poicarcinia n. gen.

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Type species: Poicarcinia jandairensis n. sp.

Diagnosis

Head shield subquadrangular with round distal margins, slender than pleotelson. Pleon length about 30% of body length; pleonite I reduced but dorsally visible, not covered by pereonite VII, pleonite II with posterior points developed, body outline not continuous. Genital papilla bilobed. Pleopods III – V expanded, round shaped. Uropods small, not exceeding distal margin of pleotelson.

Etymology

The term “Po-i” originates from the Brazilian indigenous Tupi language, signifying “thin” in reference to the species slender body. This word was fused to the Greek word “carcinia” meaning small shrimp. Gender feminine.

Taxonomic remarks

Poicarcinia n. gen. can be distinguished by the subquadrangular shape of the head shield, contrasting with the trapezoidal shape found in other genera. The head is slender than the pleotelson, a feature shared with Pongycarcinia , Calabozoa , and Itararecarcinia n. gen. The pleon exhibits reduced pleonites I and II, but they are not covered by pereonite VII as in Oiticicarcinia n. gen., and the pleonite II is well developed, in similar length as pleonite III. The body outline is not continuous, similar to Itararecarcinia n. gen. The pleotelson size is similar to the pattern observed in Oiticicarcinia n. gen. and Itararecarcinia n. gen., being shorter relative to body length, comprising approximately 20% of body length and 60% of pleon length. The shape of pleopods III – V is round, resembling that of Pongycarcinia and Itararecarcinia n. gen., as opposed to the oval shape observed in Calabozoa and Oiticicarcinia n. gen.