Species Card of Copepod
Cyclopoida ( Order )
    Oithonidae ( Family )
        Limnoithona ( Genus )
Limnoithona tetraspina  Zhang & Li, 1976   (F,M)
Boxshall & Halsey, 2004 (p. 611)
Species Limnoithona tetraspina - Plate 1 of morphological figuresIssued from : G. Zhang & Z. Li in Acta Zoologica Sinica, 1976, 22 (4). [p.403, Figs.1-10].
Female (from mouth of Yangtse): 1, habitus (dorsal); 2, rostrum (lateral); 3, P1; 4, P2; 5, P3; 6, P4; 7, P5.

Male: 8, habitus (dorsal); 9, A1; 10, P5 and genital segment.

Nota Female: Caudal rami 6 times as long as broad.
P1 to P4 with exopods and endopods 3-segmented.
P5 2-segmented, basal segment fused with 5th thoracic segment, distal segment bearing 2 spines on outer border, a long seta at distal end and small spine at the distal portion of the inner border.

Nota Male: Grasping A1 14-segmented.
P5 similar to that of the female in general ap^pearance.
P6 bearing 2 setae of unequal lengths.

Species Limnoithona tetraspina - Plate 2 of morphological figuresIssued from : G. Zhang & Z. Li in Acta Zoologica Sinica, 1976, 22 (4). [p.405]. Characters compared between L. tetraspina and L. sinensis.

Compl. Ref.:
Dussart & Defaye, 1985 (p.10); Ohtsuka & al., 2008 (p.115, Table 5); Cordell & al., 1997 (p.2, invasive species, % change 1980-1997); Winder & al., 12011 (p.749, figs.2, 6, invasion chronology); Bollens & al., 2012 (p.101, fig.2, Table 1, species competition); Kimmerer & al., 2014 (p.722, reproduction , growth vs food)
NZ: 3

Distribution map of Limnoithona tetraspina by geographical zones
Species Limnoithona tetraspina - Distribution map 2Issued from : M. Winder, A.D. Jassby & R.M. Nally in Ecology Letters, 2011, 14. [p.753, Fig.3, e].
Historical abundances of introduced species in the upper San Francisco Estuary between 1972 and 2009.
Adult stages are shown because immature stages were not continuously identified.
China (brackish), mouth of Yangtze River, East China Sea, San Francisco and Columbia River estuaries
N: 6
(1173) F: 0,48-0,44; M: 0,40-0,44; {F: 0,48-0,44; M: 0,40-0,44}
Rem.: Incomplete data.
According to Cordell & al., 2008 (p.753) the 1st records of this species in San Francisco estuary and Columbia River are 1993 for the former and 2003 for the latter.

Diagnosis after Boxshall & Halsey (2004, p.611):
P5 2-segmented, with 4 spines/setae on free exopodal segment.
Last update : 04/02/2016
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2024. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed May 18, 2024]

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