Pectenocaris, Corgosinho & Rocha, 2024

Corgosinho, Paulo Henrique Costa & Rocha, Carlos Eduardo Falavigna Da, 2024, Pectenocaris gen. nov., a new Brazilian Parastenocaridinae Chappuis, 1940, and Afrocaris gen. nov., a West African Fontinalicaridinae Schminke, 2010 (Copepoda, Harpacticoida, Parastenocarididae), European Journal of Taxonomy 970, pp. 102-121 : 105

Pectenocaris gen. nov.

urn:lsid:zoobank.org:act:6F956703-BBF2-438D-A232-0C783005C5F7

Diagnosis

Parastenocarididae

Body elongated, vermiform, cylindrical, without clear demarcation between prosome and urosome. Fu cylindrical, with outer setae I–III and dorsal seta VII inserted in same transversal plane. Male A1 eightsegmented, ae on 5 th and 8 th segments. Female A1 seven-segmented, ae on 4 th and 7 th segments. Md, Mx2, Mxp as in other Parastenocarididae (exception: Mx2 of Remaneicaris ; Corgosinho & Martínez Arbizu, 2005). Mx1 praecoxal arthrite armed with six elements, instead of four as figured in other species of the family (e.g., Remaneicaris insolitus Corgosinho et al., 2010 ). Setae on Mx1 and 2 transformed in hollow tubes. P1 and P2 characteristic of Parastenocarididae , without any unusual character. Male P3 with strongly ornated basis, with inner and outer rows of spinules; exp-1 thin and straight, with proximal and distal longitudinal spinular row, and inner proximal protuberance with a distal pore; apophysis sigmoidal, elongated, slightly bent inwards; thumb elongated, straight, slightly longer than apophysis. Female P3 enp almost as long as exp-1, spiniform. Male P4 exp-1 heavily ornamented along whole inner margin; exp-2 with row of spinules along last third of inner border and continuing on distal margin on anterior and lateral surfaces; basis with strong cylindrical spinules with rounded tip near the insertion of short filiform enp. P5 without sexual dimorphism, short, outer setae proximally inserted, with long spiniform inner process. Female P6 an unarmed and unornamented fused plate over genital field. Genital field is rectangular, much broader than high, occupying proximal third of genital double somite.

Etymology

The generic name is derived from the Latin noun ‘ pecten ’, meaning ‘comb’, and refers to the comb formed by a row of long spinules along the inner margin of the first exp segment of leg 4 of the male.

Putative autapomorphies of Pectenocaris gen. nov.

1) Mx1 praecoxal arthrite armed with 6 elements; 2) setae of Mx1 and 2 transformed in hollow tubes; 3) Strong cylindrical spinules with rounded tip on male P4 basis, near insertion of filiform enp, and strong ornamentation (long spinules) on inner margin of male P4 exp-1 and 2; 4) male P3 exp-1 thin and straight, apophysis sigmoidal, elongated, slightly bent inwards; thumb elongated, straight, digitiform, slightly longer than apophysis.