Species Card of Copepod
Calanoida ( Order )
    Clausocalanoidea ( Superfamily )
        Phaennidae ( Family )
            Talacalanus ( Genus )
Talacalanus maximus  (Brodsky, 1950)   (F)
Syn.: Xanthocalanus maximus Brodsky, 1950 (1967) (p.228, figs.F, Rem.); Tanaka & Omori, 1967 (p.247, figs.F); Tanaka & Omori, 1992 (p.269, Rem.); Galbraith, 2009 (pers. comm.)
Mixtocalanus robustus M: Brodsky, 1950 (1967, p.238, figs.M, non F)
Ref.:
Campaner, 1978 a (p.976, Rem.); Bradford & al., 1983 (p.70); Vyshkvartzeva, 1989 (p.23, Rem.)
Species Talacalanus maximus - Plate 1 of morphological figuresissued from : O. Tanaka & M. Omori in Publ. Sero Mar. Biol. Lab., 1992, 35 (4/5). [p.267, Fig.8, g-h]. As Xanthocalanus maximus.
Female (from Izu region, Japan): g, Mx2; h, sensory filaments of terminal part of Mx2.

Nota: Re-examination of female specimen described by Tanaka & Omori (1967) revealed that the leaf-like seta on 5th lobe of Mx2 is not as long as illustrated in their report and that endopod of Mx2 armed with 1 long vermiform and 7 short brushform sensory filaments, instead of 8 bud-like filaments.


Species Talacalanus maximus - Plate 2 of morphological figuresissued from : O. Tanaka & M. Omori in Information Bull on Planktology in Japan. Commemoration Number of Dr. Y. Matsue's Sixtieth Birthday, December 1967. [p.248, Fig.3]. As Xanthocalanus maximus.
Female: A, habitus (dorsal); B, A1; C, forehead (lateral); D, last thoracic segment and urosome (lateral right side); E, idem (dorsal); F, rostrum (fromtal view); G, A2; H, Md (mandibular palp); I, Md (cutting blade); J, Mx1.

Nota: Proportional lengths of urosomites and furca 43 : 16 : 13 : 28 = 100.
A1 extends to the end of furca.


Species Talacalanus maximus - Plate 3 of morphological figuresissued from : O. Tanaka & M. Omori in Information Bull on Planktology in Japan. Commemoration Number of Dr. Y. Matsue's Sixtieth Birthday, December 1967. [p.249, Fig.4]. As Xanthocalanus maximus.
Female: A, Mx2; B, sensory organ of Mx2; C, Mxp; D, P1; E, P2; F, P3; G, P4; H, P5.


Species Talacalanus maximus - Plate 4 of morphological figuresIssued from : K.A. Brodskii in Calanoida of the Far Eastern Seas and Polar Basin of the USSR. Opred. Fauna SSSR, 1950, 35 (Israel Program for Scientific Translations, Jerusalem, 1967) [p.228, Fig.139]. As Xanthocalanus maximus.
Female (from NW Pacif.): habitus (dorsal and lateral right side); R, rostrum; Mx, Mx1; Mp1, Mx2S1, P1; S2, P2; S5, P5.


Species Talacalanus maximus - Plate 5 of morphological figuresIssued from : K.A. Brodskii in Fauna USSR, Zool. Inst. Acad. Sci. USSR, 1950 (1967), 35. [p.239, Fig.150]. As Mixtocalanus robustus.
Male (from NW Pacif.): habitus (dorsal and lateral, respectively; Mp1 = distal part of Mx2; S1 = P1; S5 = P5; Ri = right side; Le = left side; R = rostrum.

Nota: Figure male located here for memory.
-Rostrum bifid but without defined filaments.
- A1 longer, reaching end of caudal rami.
- A2 exopod by 1/3 longer than endopod.
- Mx2 bears 2 setae with very large sherical tips.
- Outer spines of exopod of P1 very short.
Right P5 3-segmented, 1/5 as long as the 5th segment left leg; longest segment of left leg is the third, shortest the 5th, which is hairy and bears 2 short apical spines; spines present on distal margin of 3rd (1 spine) and 4th (2 spines) segments.

NZ: 2

Distribution map of Talacalanus maximus by geographical zones
Loc:
Japan , NW Pacif., off British Columbia (rare)
N: 3
Lg.:
(22) F: 9; (70) F: 9,8; {F: 9,00-9,80}
Rem.: bathy-abyssopelagic.
For Brodsky (1967, p.229) this species resembles the Atlantic species Xanthocalanus greeni Farran (= Talacalanus greeni) but differs in its larger size, the rounded posterior corners of the last thoracic segment and the lesser number of spines on he distal segment of P5 female.
Last update : 05/04/2016
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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 November 29, 2023]

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