Labidocera fluviatilis - Species Card - Marine Planktonic Copepods

Labidocera fluviatilis F. Dahl, 1894 (F,M)

Taxonomy

Order Calanoida

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Superfamily Diaptomoidea

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Family Pontellidae

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Genus Labidocera

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Abbreviations or symbols

Synonymy

? Labidocera brasiliense Farran, 1929 (p.276); Gaudy, 1963 (p.28, Rem.); Silas & Pillai, 1976 (p.774);
Pontella resnautica Oliveira, 1945 b (p.192);
Pontellina navalium Oliveira, 1946 (p.472)

References

List of the studied authors

F. Dahl, 1894 c (p.21, figs.F,M); Giesbrecht & Schmeil, 1898 (p.137, Rem. F,M); Björnberg, 1963 (p.59, fig.M, Rem.); Ramirez, 1966 (p.18, figs.F,M, Rem.); 1969 (p.83, figs.F,M); Björnberg, 1972 (p.53, Rem.N, figs.); Fleminger, 1975 (p.401 & suiv.); Björnberg & al., 1981 (p.659, figs.F,M); Sazhina, 1985 (p.70, figs.N); Bradford-Grieve & al., 1999 (p.885, 959, figs.F,M)

Figures

Plate 1 issued from : F.C. Ramirez in Contr. Inst. Biol. mar., Buenos Aires, 1969, 98. [p.26, Lam. I, figs.4, 6, 7 ].
Female (from off Mar del Plata): 6, P5.

Male: 4, right A1; 7, P5.
Scale bars in mm: 0.5 (4, 7); 0.2 (6).

Species Labidocera fluviatilis - Plate 2 of morphological figures

Plate 2 issued from : F.C. Ramirez in Bol. Inst. Biol. Mar., Mar del Plata, 1966, 11. [Lam.VI, Figs.2, 3-5, 7].
Male (from off Mar del Plata): 2, P2; 3, habitus (dorsal); 7, right A1.

Female: 4, P2; 5, habitus (dorsal).

Species Labidocera fluviatilis - Plate 3 of morphological figures

Plate 3 issued from : T.S.K. Björnberg in Bol. Univ. Inst. Oceanogr. Sao Paulo, 1963, XIII, 1. [p.59, Fig.31].
Male (from Brazil): Posterior part of thorax and urosome (dorsal).

Nota: Dahl did not register a little protuberance on the left point of the last thoracic segment of the male.

Species Labidocera fluviatilis - Plate 4 of morphological figures

Plate 4 Issued from : J.M. Bradford-Grieve, E.L. Markhaseva, C.E.F. Rocha & B. Abiahy in South Atlantic Zooplankton, edit. D. Boltovskoy. 1999, Vol. 2, Copepoda; [p.1068, Fig. 7.385: Labidocera fluviatilis]. B = basis; r = right leg; l = left leg.
Female characters (from key p.959):
- In dorsal view, genital segment without projection on right, symmetrical.
- Exopod of P5 terminal segment with bifurcate tip.
- Posterior prosome corners produced into long points;
- Poterior prosome corners produced into points, without posterior lobes.
- Anterior cephasosome without crest, rounded in dorsal view;
- Cephalon without lateral hooks.
Male characters (from key p.959):
- Left basis of P5 with short process;
- Exopodal segment 3 of right P5 much longer than 1/2 width of exopodal segments 1-2

Complementary References

List of the studied authors

Sewell, 1948 (p.451, 452); Weikert, 1975 (p.141, carte); Hoffmeyer, 1994 (p.303); Eskinazi-Sant'Anna & Tundisi, 1996 (tab.2); Lopes & al., 1998 (p.195); Neumann-Leitao & al., 1999 (p.153, tab.2); Pakhomov & al., 2000 (p.1663, Table 2, transect Cape Town-SANAE antarctic base); Ara, 2001 b (p.121); Marrari & al., 2004 (p.667, tab.1); Berasategui & al., 2005 (p.485, tab.1); Berasategui & al., 2006 (p.485: fig.2); Neumann-Leitao & al., 2008 (p.799: Tab.II, fig.6); Muelbert & al., 2008 (p.1662, Table 1); Miyashita & al., 2009 (p.815, Tabl.II); Magalhaes & al., 2009 (p.187, Table 1, %); Medellin-Mora & Navas S., 2010 (p.265, Tab. 2); Costa R.G. da & al., 2011 (p.364, Table 1, seasonal occurrence); Menéndez & al., 2011 (p.281, tidal effect); Menéndez & al., 2012 (p.389, Table 1: seasonal abundance); 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, %) ; Ben Ltaief & al., 2017 (p.1, Table III, Summer relative abundance); Atique & al., 2017 (p.1, Table 1); Acha & al., 2020 (p.1, Table 3: occurrence % vs ecoregions, Table 5: indicator ecoregions).

Distribution

NZ: 3

Distribution map of Labidocera fluviatilis by geographical zones

Distribution map of Labidocera fluviatilis for the Zone Mediterranean Sea, Black Sea

Localisations

Geographical glossary

Caribbean Colombia (Guajira, Tayrona), Brazil (S, Paranagua Bay, Canaeia Lagoon, Paranagua, Rio de Janeiro, Guarairas Lagoon, estuary do Pina, off Natal, Tocantins Estuary, Curuça estuary, Ajuruteua Bay, Caeté Estuary, off Amazon), Argentina (Bahia Blanca, off Mar del Plata), Uruguay (continental shelf), Atlant. (SW), E Medit. (G. of Gabes)

Quotations

N: 31

Dimensions (mm)

References of the authors concerning dimensions

(237) F: 2,5; M: 2,5; (254) F: 2,5; M: 2; (462) F: 2,5; M: 2,4; {F: 2,50; M: 2,40-2,50}

Remarks

Estuarine, Littoral; mesotidal coastal plain estuary.
After Björnberg (1963, p.59) this species was described by F. Dahl (1894) from samples taken at the Amazon River's mouth. Farran (1929, p.276) registered it under the name of L. brasiliense from samples taken off Rio de Janeiro; the only difference between the animals described by Dahl and by Farran is the proportion between the length of the exopodite and the endopodite of the P5 female (3 times as long as the endopodite in Farran's description, 1 and a half times as long in Dahl's); in the Björnberg's samples, all the intermediate lengths are found.
The form Labidocera brasiliensis cited as a synonym is not admitted by all authors (Gaudy, 1963, p. 28).
Diagnosis for L. fluviatilis in the 'darwinii' species group after Prusova & Al-Yamani (2014, p.1165) :
Females:
- 1: Urosome of 2 somites.
- 2: Genital somite symmetrical.
- 3: Exopod of symmetrical P5 with 2 terminal points.
Males:
- 1: Urosome of 4 somites.
- 2: Left P5 endopod about half the length of exopodal segment 1.

Ben Ltaief & al. (2017 (p.11, Table III) note the first record of this species in the Mediterranean Sea (Tunisia: Gulf of Gabes)

Last update : 12/02/2021

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