Pentacletopsyllus, Bang, Hyun Woo, Baguley, Jeffrey G. & Moon, Heejin, 2014

Bang, Hyun Woo, Baguley, Jeffrey G. & Moon, Heejin, 2014, A new genus of Cletopsyllidae (Copepoda, Harpacticoida) from Gulf of Mexico, ZooKeys 391, pp. 37-53 : 38-40

Pentacletopsyllus gen. n.

Diagnosis.

Cletopsyllidae . Body elongated. Cephalothorax and other somites with numerous spinous processes at margin. Rostrum very prominent, triangular, with bifid tip in its apical portion, with pair of subapical sensilla. Genital and first abdominal somites completely fused forming double-somite. Anal operculum well developed. Caudal rami cylindrical, with 7 setae; setae I-II small, closely set; seta III subapical, setae IV-V bipinnate, seta V longest, seta VI bare, Seta VII tri-articulate at base. Sexual dimorphism in antennule, P2 endopod, P5 and P6.

Antennule 5-segmented in female, 7-segmented and subchirocer in male. Antenna 3-segmented, comprising coxa, allobasis and free endopodal segment; exopod 1-segmented with 2 setae. Mandible with biramous palp; basis with 3 pinnate setae; endopod with 1 lateral and 3 distal setae; exopod 1-segmented with 1 seta. Maxillule with strongly developed praecoxal arthrite, with 2 setae on anterior surface and 9 spines/setae around distal margin; coxal endite with 1 seta and 1 spine; basis with 4 spines/setae; endopod represented by 1 seta; exopod with 2 setae. Maxilla with 3 endites; allobasis drawn out into claw; endopod minute, bearing 3 setae. Maxilliped subchelate, with 3 pinnate setae; basis asetose; endopod drawn out into long, curved, pinnate claw with 1 long bare seta and 1 short accessory seta at base.

P1 basis with outer seta and inner spine; exopod 3-segmented, exp-1 with long outer spine, exp-2 with inner seta, exp-3 with 4 elements; endopod 2-segmented and prehensile, enp-1 as long as enp-2.

P 2-P4 with outer spine or seta on basis. Exopods 3-segmented, exp-3 with 3 outer spines; endopod 2-segmented, enp-1 small, enp-2 elongate. Male P2-enp modified; inner apical seta fused to segment forming small apophysis. Armature formula:

P 5 of both sexes with separate baseoendopod and exopod. Basal seta on setophore; endopodal lobe triangular with 5 bipinnate setae in female and 3 bipinnate setae in male; exopod elongated with 5 setae in female and 4 setae in male. Male P6 asymmetrical, functional member represented by small plate, opposite member fused to genital somite; each leg with 1 bare seta.

Type and only species.

Pentacletopsyllus montagni gen. et sp. n.

Etymology.

The generic name is derived from the Greek penta, meaning five, and refers to the 5-segmented female antennule.