Deevey, 1974
Short description:
Chiridiella brooksi is an aetideid calanoid copepod known after female (2.70-2.80 mm in length) and immature male. Species was recorded in the Sargasso Sea and in the Tropical Pacific, most probably lower mesopelagic - upper bathypelagic species.
Taxonomic description:
Female. Total length 2.70-2.80 mm. Cephalothorax about 4 times longer than abdomen. A1 23-segmented, exceeding body by 3-4 segments. Ri A2 two thirds of Re in length, coxo- and basipodite with 1 seta each, external and internal lobes of Ri2 A2 with 6 setae each. Ri2 Md with 3-4 setae. Mx1 gnathobase with 10-11 setae, second internal lobe reduced, third internal lobe with 3 setae, Ri with 4, Re with 5-6 setae and external lobe with 8 setae. Mx2 of Ch. macrodactyla type with 5 endites. Mxp protopodite with 1 seta distally; Ri1 Mxp with 3 medial setae. Re P1 with 1 external terminal spine, Ri without lobe. P2 with one-segmented Ri and 2-segmented (incompletely 3-segmented) Re. P3-P4 with 3-segmented Re and incompletely 3-segmented (2-segmented) Ri. P4 coxopodite with rudimentary internal seta without hairs.
Male known after fifth copepodid stage only.
Vertical distribution:
The species was found in hauls between 442 and 1500 m (Deevey, 1974; Markhaseva, 1996). More possible lower meso-upper bathypelagic species.
Geographical distribution:
Atlantic Ocean: the Sargasso Sea (Deevey, 1974). Pacific Ocean: the species found in the tropical part (Markhaseva, 1996).
Type locality: 32°10'N, 64°30'W (Deevey, 1974).
Material examined:
1 female from sample 206. See examined samples module.