Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Euchaetidae ( Family )
            Paraeuchaeta ( Genus )
Paraeuchaeta weberi  A. Scott, 1909   (F,M)
Syn.: Euchaeta weberi : Vervoort, 1957 (p.78); Grice & Hulsemann, 1967 (p.16); 1968 (tab.2, p.332, Descr.M, figs.M); Park, 1978 (p.224, figs.F,M, Rem.); Björnberg, 1973 (p.386);
Pareuchaeta weberi : Yamanaka, 1976 (p.171, 172, 180); Zvereva, 1976 a (p.70, figs.F); Heinrich, 1990 (p.17).
A. Scott, 1909 (p.74, Descr.F, figs.F); Sewell, 1929 (p.133, 169, figs.F, Juv.F,M); Sewell, 1947 (p.123, figs.F,M); Bradford & al., 1983 (p.23); Park, 1994 (p.320); 1995 (p.76, Rem.F,M, figs.F,M).
Species Paraeuchaeta weberi - Plate 1 of morphological figuresissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.225, Fig.80]. As Euchaeta weberi.
Female: A, forehead (lateral); B, C,D,E, distal end of metasome and genital segment (dorsal, left side, right side, and ventral, respectively); F, outer lobe of Mx1; G, P1; H, P2. P1-2: legs (anterior).

Species Paraeuchaeta weberi - Plate 2 of morphological figuresissued from : T. Park in Antarctic Res. Ser. Washington, 1978, 27. [p.226, Fig.81]. As Euchaeta weberi.
Male: A, forehead (lateral); B, last metasomal and genital segments (left side); C, P1; D, P2; E, P5; F, G,H, distal end of exopod of left P5 (anterior, medial, , and anteromedial, respectively). P1-5: legs (anterior).

Nota: The male is very close from P. tonsa, P. pseudotonsa, P. tuberculata and the differences by which it can be identified are found only in the rostrum and the left P5 exopod.

Species Paraeuchaeta weberi - Plate 3 of morphological figuresissued from : T. Park in Bull. Scripps Inst. Oceanogr. Univ. California, San Diego, 1995, 29. [p.183, Fig.73].
Female: a, forehead (left side); b, urosome (left); c, d, genital somite (left, right, respectively); e, exopod of P1 (anterior); f, exopod of P2 (anterior).

Male: g, forehead (left); h, exopod of left 5th leg (anterior); i, distal exopodal segments of left 5th leg (anterior, tulted counterclockwise); j, idem (anterior); k, idem (medial).

Species Paraeuchaeta weberi - Plate 4 of morphological figuresissued from : R.B.S. Sewell in The John Murray Expedition, 1933-34, Scientific Reports, VIII (1), 1947. [p.124, Fig.28, A].
Female (from Arabian Sea): A, Mx1.
Nota: In 1929 (p.170) the 1st inner lobe (or masticatory) of Mx carried 13 setae, and thet the combined 1st and 2nd segments of the endopod carried 7 setae and the 3rd segment 3; in the present specimen, the 1st inner lobe bears 12 setae, the 2nd and 3rd lobes 1 each; the 2nd basal segment has 4 setae; the 1st segment of the endopod bears 6 setae, and the combined 2nd and 3rd carries 3; the exopod bears 11 setae and the outer lobe 9, of which the posterior two are smaller than the others.

Species Paraeuchaeta weberi - Plate 5 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.171, Fig.63, a].
Female (from Laccadive Sea): a, P2.

Species Paraeuchaeta weberi - Plate 6 of morphological figuresissued from : R.B.S. Sewell in Mem. Indian Mus., 1929, X. [p.10, Fig.1].
Female: basal segment 1 of A2.
Nota: The 1st basal segment bears a row of long hairs on the posterior and inner aspect. Endopod with 6 and 8 (? 9) setae on the outer and inner lobes respectively of the distal segment.

Species Paraeuchaeta weberi - Plate 7 of morphological figuresissued from : A. Scott in Siboga-Expedition, 1909, XIX a. [Plate XV, Figs.9-16].
Female (from Indoseia-Malaysia): 9, habitus (dorsal); 10, forehead (lateral); 11, last thoracic and genital segments (left side); 12, A1; 13, Mxp (part of one of the distal hairs); 14, P1; 15, P2; 16, P3 (part of terminal spine of exopodite).
Nota: A1 extend to about the middle of the genital segment. This species is easily recognised by the peculiar form of the genital segment.

Species Paraeuchaeta weberi - Plate 8 of morphological figuresissued from : G.D. Grice & K. Hulsemann in Pacif. Sci., 1968, 22 (3). [p.330, Figs.53-59]. As Euchaeta weberi.
Male (from SE Pacific): 53-54, habitus (dorsal and lateral, respectively); 55, forehead (lateral); 56, posterior end of thorax and 1st urosome segment (left lateral view); 57, idem (right lateral view); 58, distal end of exopod of left P5; 59, idem (another view).

Species Paraeuchaeta weberi - Plate 9 of morphological figuresParaeuchaeta weberi Female:
1 - See key to species Groups and independent species of Paraeuchaeta (p.30).
2 - Laterally, genital field facing ventrad, without large tubercular outgrowth behind genital orifice (Fig.73-c).
3 - Genital somite with large tibercular outgrowths on dorsal side (Fig.73-c).

Compl. Ref.:
Sewell, 1948 (p.329, 530, 532, 534, 539, 540, 541, 552); Bainbridge, 1972 (p.61, Appendix Table III: occurrence); Björnberg, 1973 (p.329); C.E. Morales & al., 2010 (p.158, Table 1); Hidalgo & al., 2010 (p.2089, Table 2); Hidalgo & al., 2012 (p.134, Table 2)
NZ: 7

Distribution map of Paraeuchaeta weberi by geographical zones
G. of Guinea (off Lagos in Bainbridge, 1972), Mozambique Channel, Gulf of Aden, Arabian Sea, off SW Sri Lanka, Indian, Indonesia-Malaysia, China Seas (East China Sea), W Pacif. (equatorial), SE Pacif. (tropical), off Juan Fernandez Is., Chile (N, off Santiago, Concepcion).

Type locality: Malay Archipelago.
N: 15
(3) F: 8-6,7; M: 6,8-6; (5) F: 8,5; (20) F: 7,66-7,16; M: 6,58-6,25; (29) F: 7,562; (100) M: 6,41; {F: 6,70-8,50; M: 6,00-6,41}

The mean female size is 7.597 mm (n = 6; SD = 0.6291), and the mean male size is 6.408 mm (n = 5; SD = 0.3061). The size ratio (male : female) is approximatively ± 86 %
Rem.: Meso-bathypelagic.
Park (1995, p.77) found this species off Chile in the southeastern Pacific (35°S and 47°S), in the Indo-western Pacific region including the equatorial western Pacific, the Maly Archipelago, the equatorial eastern Indian Ocean, and the Bay of Bengal between 10°N and 14°S and between 87°E and 158°E and in the Mozambique Channel at 25°S. For Park, these findings together with the previous records show two distinct areas of distributions: one in the equatorial area of the western Pacific and Indian Ocean extending from 158°E westward to Africa and another in the southeastern Pacific between 31°S and 47°S and between the Chilean coast and 92°W; for the author no morphological differences were found in the samples between individuals from these two isolated areas.
W. Zhang confirms the presence of this species in the seas of China (pers. comm. 2006).
Last update : 12/08/2016
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2023. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed June 06, 2023]

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Marine Planktonic Copepods

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