Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Diaptomoidea ( Superfamille )
        Pseudodiaptomidae ( Famille )
            Pseudodiaptomus ( Genre )
Pseudodiaptomus acutus  (F.Dahl, 1894)   (F,M)
Syn.: Weismannella acuta Dahl, 1894 c (p.20, figs.F,M);
Schmackeria acutus Poppe & Mrazek, 1895
Ref.:
Marsh, 1933 (p.30, figs.F,M); Wright, 1936 (p.10, figs.F,M); 1937 a (p.162, fig.M); Sewell, 1948 (p.452); Carvalho, 1952 a (p.146, figs.M); Björnberg, 1972 (p.42, figs., Rem.N & juv.); Bowman, 1978 (p.249, fig..F, Rem.); Dussart & Defaye, 1983 (p.29); Grindley, 1984 (p.226); Sazhina, 1985 (p.63, figs. Nauplius); Walter, 1986 (p.131); 1986 a (p.502, fig.1: zoogeogr.); 1987 (p.366); 1989 (p.615, Rem., figs.F,M; Rem.); Bradford-Grieve & al., 1999 (p.884, 951, figs.F,M, p.876: carte); Ferrari & Dahms, 2007 (p.22, 31, 33, Rem. N)
Espèce Pseudodiaptomus acutus - Planche 1 de figures morphologiquesissued from : T.C. Walter in Bull. Mar. Sc., 1989, 45 (3). [p.617, Fig.14].
Female: A, habitus (dorsal); B, idem (lateral right side); C, last thoracic segments and urosome (lateral left side); D, P5 (anterior view).

Male: E, habitus (dorsal); F, idem (lateral right side); G, P5 (posterior view); H, idem (anterior view).


Espèce Pseudodiaptomus acutus - Planche 2 de figures morphologiquesissued from : T.C. Walter in Bull. Mar. Sc., 1989, 45 (3). [p.618, Fig.15]. With doubt.
Male variant (from Sao Paulo): A, P5 (posterior view); B, idem (anterior view); C, left exopod 2 of P5 (lateral view).
Nota: The variants appeared identical to the normal male except that they were larger (1.10-1.18 mm) and the P5 more than twice as large with differences.


Espèce Pseudodiaptomus acutus - Planche 3 de figures morphologiquesissued from : T.E. Bowman in Crustaceana, 1978, 35 (3). [p.250, Fig.1].
Female (from Kingston Harbor, Jamaica): A, habitus (lateral left side); B, idem (dorsal); C, last thoracic segment and urosome (lateralleft side); D, urosome (lateral right side); E, last thoracic segment and urosome (dorsal); F, P5 (posterior).
Nota: Suture between the head and 1st pediger segment is complete laterally, although rather indistinct.5th pediger segment is armed with 2 spines on the left side and 1 spine on the right side (the copepodite V has 1 spine on each side). The genital segment has patches of fine hairs proximally and a group of longer hairs distally on the left side.


Espèce Pseudodiaptomus acutus - Planche 4 de figures morphologiquesissued from : S. Wright in Ann. Acad. Brasileira Sci., 1937, 9 (2). [Pl.1, Fig.4].
Male: 4, right P5.


Espèce Pseudodiaptomus acutus - Planche 5 de figures morphologiquesissued from : S. Wright in Annaes. Acad. bras. Cienc., VIII (1), 1936. [Pl.III, Fig.8].
Female : 8, urosome and 5th thoracic segment (the urosome is normally straight).


Espèce Pseudodiaptomus acutus - Planche 6 de figures morphologiquesissued from : S. Wright in Annaes. Acad. bras. Cienc., VIII (1), 1936. [Pl.II, Figs.5-6].
Female: 5, P5.

Male: 6, P5.


Espèce Pseudodiaptomus acutus - Planche 7 de figures morphologiquesIssued from : C.D. Marsh in Proc. U.S. natn. Mus., 1933, 82 (18) (2959). [Pl. 15, figs.1, 2, 4]. After Dahl, 1894.
Female: (from mouth of Amazon): 1, habitus (lateral); 4, P5.

Male: 2, P5.

Ref. compl.:
Carvalho, 1952 (p.146); Björnberg, 1963 (p.45, Rem.); Jacoby & Youngbluth, 1983 (p.77, fig.1, Table 2, 3, Rem: mating behavior); Lopes, 1994 (tab.1); Mauchline, 1998 (p.508, tab.47, 56); Lopes & al., 1998 (p.195); Suarez-Morales & Gasca, 1998 a (p.111); Ara, 2001 b (p.121); 2004 (p.179, figs.3,4,5); Medeiros & al., 2006 (p.243), Table 1); Sterza & Fernades, 2006 (p.95, Table 1, occurrence); Morales-Ramirez & Suarez-Morales, 2008 (p.514); Magalhaes & al., 2009 (p.187, Table 1, %); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2); Magris & al., 2011 (p.260, abundance, interannual variability); Costa R.G. da & al., 2011 (p.364, Table 1, seasonal occurrence); Almeida LR. & al., 2012 (p.13, Table 1, abundance); Miyashita & al., 2012 (p.1557, Table 2: occurrence); Araujo & al., 2016 (p.1, Table 3, abundance, %); Atique & al., 2017 (p.1, Table 1); Dias & al., 2018 a (p.189, Rem.: p.196).
NZ: 2

Carte de distribution de Pseudodiaptomus acutus par zones géographiques
Espèce Pseudodiaptomus acutus - Carte de distribution 2issued from : T.C. Walter in Bull. Mar. Sc., 1989, 45 (3). [p.625, Fig.18].
Map of American continents showing the zoogeography of Pseudodiaptomus species.
Espèce Pseudodiaptomus acutus - Carte de distribution 3issued from : T.E. Bowman in Crustaceana, 1978, 35 (3). [p.251, Fig.2].
Known distribution if P. acutus.
Nota: Because the coastal and estuarine plankton of northern South America and the Caribbean Islands is inadequately known, it cannot be concluded that the Jamaican population is disjunct. Its presence could be explained by the prevailing current pattern; the northwestern flow of surface water along the northeastern coast of South America is joined near Trinidad by a branch of the North Equatorial Current and continues its northwesterly movement as the Caribbean Current towards the Yucatan Channel. The species could be carried to Jamaica by the clockwise eddy south of Cuba. But there are difficulties with the current-transport hypothesis; whereas the naupliar and copepodite 1 are truly planktonic, the adults are not, but settle on or near the bottom during the day where they are able to attach firmly to substrata. This formis adapted for life in rather shallow water. Another difficulty is the time involved; at 30 miles/day, about 80 days would be required for direct transport from Para (Brazil) to Jamaica; this is a long time for a copepod with a generation of about 25 days and a life span of about 50 days (Jacobs, 1961). A second possible explanation is by the transport of founder specimens in ship's ballast water or in the fouling growth of ship's hullls
Espèce Pseudodiaptomus acutus - Carte de distribution 4Issued from : C.A. Jacoby & M.J.Y. Youngbluth in Mar. Biol., 1983, 76. [p.79, Fig.1 A]
Mating sequence of Pseudodiaptomus acutus.
Pair is shown: M male (RA: right A1 grasps the caudal rami of a female F).
Espèce Pseudodiaptomus acutus - Carte de distribution 5Issued from : C.A. Jacoby & M.J.Y. Youngbluth in Mar. Biol., 1983, 76. [p.83, Fig.2 A]
Mating sequence of Pseudodiaptomus acutus.
Correctly positioned male (AM) on a conspecific female (AF) from the Indian River lagoon near Fort Pierce, Florida, USA.
RL: position of the male"s right P5 relative to the female"s genital somite (GS).
Espèce Pseudodiaptomus acutus - Carte de distribution 6Issued from : C.A. Jacoby & M.J.Y. Youngbluth in Mar. Biol., 1983, 76. [p.83, Fig.2 B]
Improper copulatory position in Pseudodiaptomus heterospecific pairs: P. acutus male (AM) posteriad on a female P. cokeri (CF).
Espèce Pseudodiaptomus acutus - Carte de distribution 7Issued from : C.A. Jacoby & M.J.Y. Youngbluth in Mar. Biol., 1983, 76. [p.83, Fig.2 C]
Improper copulatory position in Pseudodiaptomus heterospecific pairs: P. cokeri male (AM) anteriad on a female P. acutus (CF).
Espèce Pseudodiaptomus acutus - Carte de distribution 8Issued from : C.A. Jacoby & M.J.Y. Youngbluth in Mar. Biol., 1983, 76. [p.83, Fig.2 D]
Improper copulatory position in Pseudodiaptomus heterospecific pairs: misplaced spermatophore (S) of P. coronatus attached to a female P. acutus (AF); spermatophore should be attached to the female"s genital somite (GS)..
Espèce Pseudodiaptomus acutus - Carte de distribution 9Issued from : C.A. Jacoby & M.J.Y. Youngbluth in Mar. Biol., 1983, 76. [p.81, Table 2].
Pseudodiaptomus acutus life history from the Indian River lagoon near Fort Pierce, Florida, USA.

In monocultures of seawater: salinity 34-36 per 1000, 24-26*C.
Nota: After the authors, the three species P. acutus, P. cokeri and P. pelagicus, have similar life histories. These species are demersal, they move near or onto the substratum during the day and migrate into the water column at night.Two of these species P. acutus and P. cokeri are sympatric in the Caribbean (Bowman, 1978) and should exhibit at least one reproductive isolating mechanism. The third species P. pelagicus, is the only member of the genus found along the eastern and Gulf coasts of North America.
Espèce Pseudodiaptomus acutus - Carte de distribution 10Issued from : C.A. Jacoby & M.J.Y. Youngbluth in Mar. Biol., 1983, 76. [p.82, Table 3].
Pseudodiaptomus sp. Characteristics of mating behavior for heterospecific and conspecific pairs between P. acutus, P. pelagicus and P. cokeri from the Indian River lagoon near Fort Pierce, Florida, USA.

In monocultures of seawater: salinity 34-36 per 1000, 24-26*C.
Loc:
Brazil (Paranagua Bay, Guanabara Bay, Vitoria Bay, Macaé, Bracui, Cananeia Lagoon, Santos Bay, Guarairas Lagoon, Mucuri estuary, Guarau estuary, Tocantins River, Curuça estuary, Ajuruteuq Bay, Caeté Estuary, Amazon estuary, Surinam, Venezuela, Caribbean Colombia (San Andrés y Providencia, Tayrona), Jamaica, Puerto Rico, E Costa Rica
N: 28
Lg.:
(237) F: 1,1-1,3; M: 0,85; (950) F: 1,14-1,36; M: 0,92-1,05; (1003) F: 1,17; (1012) F: 1,17; M: 0,90; {F: 1,10-1,36; M: 0,85-1,05}
Rem.: saumâtre, estuaire.
Incomplete data. On observe des differences entre les formes de Walter (1989) et celle de Bowman (1978 a), notamment concernant la partie postérieure du 5th pediger; les P5 ne sont pas malheureusement pas représentées sur la même face.
Dernière mise à jour : 12/02/2021

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Razouls C., Desreumaux N., Kouwenberg J. et de Bovée F., 2005-2021. - Biodiversité des Copépodes planctoniques marins (morphologie, répartition géographique et données biologiques). Sorbonne Université, CNRS. Disponible sur http://copepodes.obs-banyuls.fr [Accédé le 02 décembre 2021]

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