The Pelagic Copepods of the Izu Region, Middle Japan Systematic Account, v -Family Euchaetidae-

Abstract

Length. Female, 3.10~3.26 mm; male, 3.50~3.64 mm. Remarks. The present female specimen belongs to the small-sized example which has been suggested by SEWELL (1947).

Early development and estimated life cycle of the mesopelagic copepod Pareuchaeta elongata in the southern Japan Sea

“…The copepod Pareuchaeta elongata (Esterly) is synonymous with Euchaeta elongata Esterly, E. japonica Marukawa or Pareuchaeta japonica (Marukawa) (Campbell 1934;Tanaka 1958;Park 1995), and is distributed in mid-water of the Okhotsk Sea, Bering Sea, Japan Sea and probably the entire North Pacific (Brodskii 1950;Park 1995). P. elongata is a typical carnivore, and exerts considerable predation pressure on other copepods (Yen 1983;Greene et al 1985;Ohman 1986).…”

Taxonomy and zoogeography of euchaetid copepods (Calanoida, Clausocalanoidea) from Korean waters, with notes on their female genital structure

“…However, Park (1995) transferred this species to the genus Paraeuchaeta based on the following characteristics; female appendicular caudal setae short and geniculate; male leg 5 with blunt spine on distal exopodal segment. P. russelli (Figure 9) was originally described from the Great Barrier Reef by Farran (1936) (as E. russelli), and also recorded from the northeastern coast (Mori 1937 as E. daitomarui), the Izu region (Tanaka 1958, Tanaka andOmori 1968) and Sagami Bay of Japan (Park 1995). This species commonly appears in the southeastern region and East/Japan Sea of Korea waters between August and November.…”

“…These marks occasionally looked like a semicircular projection but are easy to discern. E. plana (Figure 9) was originally described from the East China Sea (Mori 1937) and continuously found in Izu region of Japan (Tanaka 1958), the Arabian Sea (Sewell 1947, as E. murrayi), the Malay Archipelago and off southern and central coast of Japan (Park 1995). This species commonly appears in the southeastern region and the East/ Japan Sea between March and November.…”

“…P. elongata (Figure 9) was originally described from the San Diego region by Esterly (1913) and from Oregon, Vancouver Island, and the Gulf of Alaska (Campbell 1929 as E. japonica), the Bering Sea, the northwestern Pacific, the Sea of Okhotsk (Brodsky 1950 as P. japonica), the East Sea (Sea of Japan) (Marukawa 1921 as E. japonica), and Sagami Bay of central Japan (Tanaka 1958). This species rarely appears in the northern part of East/Japan Sea between August and October (Table 1).…”

“…Distribution of the family Euchaetidae based on previous records and the present study. References used are: Scott (1909), Farran (1936), Mori (1937), Tanaka (1958Tanaka ( , 1973 in Euchaeta concinna; Scott (1909), Mori (1937), Tanaka and Omori (1968), Tanaka (1973) in E. indica;Scott (1909), Mori (1937), Tanaka and Omori (1968), Tanaka (1973) in E. longicornis; Mori (1937), Sewell (1947), Tanaka and Omori (1968), Tanaka (1973) in E. plana; Mori (1937), Bradford (1974) in E. rimana; Tanaka and Omori (1968) in Paraeuchaeta elongata; Farran (1936), Chen and Zhang (1965), Tanaka and Omori (1968) in P. russelli variation in the form of its genital protrusion (Sewell 1929;Farran 1936;Grice 1962). Similar variation in the female genital double somite such as the profile in lateral view, the width-length ratio and the degree of projection were all observed in above-mentioned species.…”