Tanaka, 1957a
Short Description:
Chiridius longispinus is an aetideid calanoid copepod known after male (1.52 mm in length) from Japanese waters.
Taxonomic Description:
Male. (Description after Tanaka (1957) with modifications). Total length 1.52 mm. Cephalothorax 3 times longer than abdomen. Points of Th5 posterior corners reaching the end of genital segment. A1 reaching the end of genital segment. Ri2 Md with 9 setae. Mx1 with 6 setae on external lobe; 9 setae on Re; 9 on Ri and 2 near its base, second and third internal lobes with 1 seta each. Mx2 strangely reduced. External spine on Re1 P1 nearly reaching the distal border of Re2 P1. P2 with 2-segmented Ri. P5 shorter than half length of P4.
Vertical distribution:
The species found in total haul from 1000 m (Tanaka, 1957a).
Geographical distribution:
Pacific Ocean: from the Izu region only (Tanaka, 1957a).
Type locality: the Izu region.
Material examined:
The species absent in the collections of the Zoological Institute, Russian Academy of Sciences, St. Petersburg.