Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Euchaetidae ( Family )
            Paraeuchaeta ( Genus )
Paraeuchaeta incisa  (Sars, 1905)   (F,M)
Syn.: Euchaeta incisa Sars, 1905 b (p.17, Rem.F); Vervoort, 1957 (p.77); Park, 1975 c (p.17, Descr.M, figs.F,M, Rem.); Deevey & Brooks, 1977 (p.256, tab.2, Station "S"); Mauchline, 1992 a (p.2); 1999 (n°182, p.9, figs.F,M);
Pareuchaeta incisa : Sars, 1925 (p.117, figs.F); Vives, 1982 (p.291); Lozano Soldevilla & al., 1988 (p.58)
Sewell, 1948 (p.348, 501, 566, 569); Roe, 1972 (p.277, tabl.1, tabl.2); Bradford & al., 1983 (p.23); Park, 1994 (p.319); 1995 (p.79, Rem.F, M, figs. F,M) ; Vives & Shmeleva, 2007 (p.672, figs.F,M, Rem.)
Species Paraeuchaeta incisa - Plate 1 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.186, Fig.76].
Female: a, forehead (left side); b, urosome (left); c, d, genital somite (left, right, respectively); e, A2; f, Mx1 (first inner lobe omitted), posterior; g, exopod of P1 (anterior); exopod of P2 (anterior).
Nota: Cephalosomal appendages similar to those of P. norvegica except that seta on 2nd exopodal segment of A2 much developed. Outermost seta on basis of Mx1 also well developed. In P1 exopod, outer spine of 1st segment very small; that of 2nd segment short of reaching base of following outer spine. In P2 exopod, outer spine of 2nd segment extending beyond distal end of following outer spine and about as long as 2nd outer spine of 3rd segment; incision separating 2nd marginal lobe of 3rd segment relatively deep.

Male: i, forehead (left); j, last pedigerous and genital somites (left); k, exopod of P1 (anterior); l, exopod of P2 (anterior); m, exopod of left 5th leg (medial); n, distal exopodal segments of left 5th leg (medial, tilted counterclockwise); o, idem (lateral, tilted clockwise); p, idem (anterior, tilted counterclockwise).

Species Paraeuchaeta incisa - Plate 2 of morphological figuresIssued from : G.O. Sars in Résult. Camp. Scient. Prince Albert I, 69, pls.1-127 (1924). [Pl.XXXII, figs.7-11]. As Pareuchaeta incisa.
Female: 7, habitus (dorsal); 8, idem (lateral left side); 9, forehead (lateral); 10, genital somite (lateral left side); 11, genital complex (ventral).

Species Paraeuchaeta incisa - Plate 3 of morphological figuresissued from : J. Mauchline in ICES Ident. Leafl. Plankton, 1999, N°182. [p.3, Fig.2: 19a]. As Euchaeta incisa.
Female (Northeast Atlantic): 19a, genital double-somite (left side).

Species Paraeuchaeta incisa - Plate 4 of morphological figuresissued from : J. Mauchline in ICES Ident. Leafl. Plankton, 1999, N°182. [p.4, Fig.3: 19b]. As Euchaeta incisa.
Male (Northeast Atlantic): 19b, terminal two segments, exopodal segments of left P5.

Species Paraeuchaeta incisa - Plate 5 of morphological figuresissued from : T. Park in Smiths. Contr. Zool., 1975, 196. [p.18, Fig.15]. As Euchaeta incisa.
Female (G. of Mexico): a, forehead (lateral); b-c, genital segment (left side and right side, respectively); d, same (ventral); e, outer lobe of Mx1; f, P1 (anterior); g, P2 (anterior).

Male: h, forehead (lateral); i, exopod of P1 (anterior); j, exopod of P2 (anterior); k, P5 (anterior); l, exopod of left P5 (anterior); m, same (lateral); n, same (medial).
The male is described for the first time.

Nota: Females and males were found mainly in tows down to depths over 1000 m.

Species Paraeuchaeta incisa - Plate 6 of morphological figuresParaeuchaeta incisa Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30).
2 - Laterally, genital field facing ventrad, with large tubercular outgrowth behind genital orifice (Fig.76-c).
3 - Genital somite without transverse ridge on ventral side anterior to genital prominence (Fig.76-c).
4 - Laterally, genital flange conical and tail (Fig.76-c).

Compl. Ref.:
Grice, 1963 a (p.495); Suarez-Morales & Gasca, 1998 a (p.109); Lapernat, 2000 (tabl.3, 4)
NZ: 3

Distribution map of Paraeuchaeta incisa by geographical zones
off NW Cape Verde Is., off Morocco-Mauritania, Canary Is., off N Madeira, off SW Azores, E Sargasso Sea, Caribbean Sea, G. of Mexico, off Bermuda: Station "S" (32°10'N, 64°30'W), off N Cape Hatteras, off Rockall Is., [[ Philippines, China Seas, off California, Hawaii, off Peru, off W Juan Fernandez Is. (references Pacific only in C. B. Wilson, 1942 a, p.201; 1950, p.283; Fagetti, 1962, p.22); non maintained by Park (1995 )]].
N: 11
(1) F: 5,6; (3) F: 5,8-5,5; M: 5,3; (19) F: 5,75-5,41; M: 5,75-4,83; (199) F: 5,92; {F: 5,41-5,92; M: 4,83-5,75}
Rem.: Meso-bathypelagic. Sargasso Sea: 500-1500 m (Deevey & Brooks, 1977, station "S");
For Park (1995, p.79) this species exhibits a close similarity to P. norvegica, P. gracilis, P. exigua.
The locality records in the Pacific are to be confirmed.
Park (1995, p.79) found this species in the eastern North Atlantic (at 34°N, 16°W) and in the western North Atlantic along 39°N between 64°W and 73°W.
Last update : 27/01/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed October 18, 2021]

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