Genus Aggistropodacaris gen. nov. Corgosinho & da Rocha

http://zoobank.org/ urn:lsid:zoobank.org:act: 71E528A1-57C3-472C-A901-111364A1FB9B

Type species by monotypy Aggistropodacaris aggistropoda gen. et sp. nov. Corgosinho & da Rocha

http://zoobank.org/ urn:lsid:zoobank.org:act: 0ADCD01C-6808-4855-A2C9-ED9D28058075

Diagnosis: Small-sized Parastenocaridinae of less than 250μm, with cylindrical habitus; body cuticle poorly chitinised; dorsal integumental window on Cph only; female genital field U-shaped, 2.8 times longer than its medial width; fu cylindrical, rectangular, tapering distally, 1.2 times longer than telson, about 3.3 times as long as wide, armed with seven setae, setae I, II (shortest), and III inserted contiguously on the proximal half of furca, with distinct gap between setae I-III and VII. Antennule 7-segmented in male and in female. Segments 5 to 7 of males A1 forming a functional unit for clasping the female, in grasping position. P2 strongly sexually dimorphic, transformed into a clasping organ in the male by the hypertrophy of exp-1 and 2; exp-1 with a strong blade-shape spinule on the inner margin; exp-2 and 3 bent inwards; exp-3 with only two setae; enp reduced into a short seta. Female the P2 enp reduced into an unarmed and short glossiform element. Basis of male P3 smooth and rectangular, longer than its width; basis with a setiform enp; exp-1 rectangular and unornamented; apophysis shorter than exp-1 and with a rounded edge with a small spine on its tip; thumb longer than apophysis, robust, curved outwards and with a distal hyaline membrane. Female P3 enp is a reduced seta. Male P4 enp with a proximal pointed ingrowth and a distal fused seta longer than exp-1. Female P4 enp is spiniform, ornamented on both inner and outer margins of its distal half, longer than exp-1, reaching the half of exp-2. P5 short in male and female, acuminate on the inner distal margin, with a stronger process in the male, the distal rim of which not reaching beyond the middle of the next Ur in the male or the middle of the genital double-somite in the female, with 3 outer setae (long basal seta and two small exopodal setae) inserted distally, the middle seta the shortest.

Etymology: The generic name combines the Greek nouns άγκιστρο (ágkistro, hook), πόδι (podi, feet), and καρίς (karís, shrimp); gender is feminine.

Putative autapomorphies for the genus: Male A1 7-segmented. Male P2 transformed into a grasping organ with the corresponding transformations observed in the exopods and enp. Female P2 and P3 enp reduced; in P2 the enp is glossiform and much shorter than exp-1, short and spiniform in P3; female P4 reaching past the middle of exp-2. Male P3 exp-1 short and rectangular, apophysis shorter than exp-1 and with distal rounded edge armed with small spine; thumb robust, longer than apophysis, curved outwards, with distal hyaline margin. Male P4 enp with proximal acuminate ingrowth and long distal fused seta.