Species Card of Copepod
Monstrilloida ( Order )
    Monstrillidae ( Family )
        Monstrillopsis ( Genus )
Monstrillopsis dubia  (T. Scott, 1904)   (F,M)
Syn.: Monstrilla dubia T. Scott, 1904 (p.247, Descr.F, figs.F, Rem.); van Breemen, 1908 a (p.217, figs.F); ? Fontaine, 1955 (p.890); ? Lacroix & Filteau, 1971 (p.718); ? Davis, 1949 a (p.248); ? Tremblay & Anderson, 1984 (p.8); ? Oliveira Dias, 1996 (p.253);
no M. dubia : Sars, 1921 (p.26, figs.F,M); Rose, 1933 a (p.352, figs.F,M); Vilela, 1968 (p.45, fig.F);
Isaac, 1974 (p.136); 1975 (p.3, 6, 9, figs.F,M); McAlice & Jaeger, 1982 (p.46, Rem.); Huys & Boxshall, 1991 (p.155, 168, 440, 465, no figs.M); Grygier, 1994 a (p.28); 1995 a (p.63); Suarez-Morales & Ivanenko, 2004 (p.42, Rem.: p.43 & suiv.); Suarez-Morales & al., 2006 (p.101, 105, Tab.1); Vives & Shmeleva, 2010 (p.187, figs.F,M, Rem.); Suarez-Morales, 2011 (p.6, 10, 12, Rem.)
Species Monstrillopsis dubia - Plate 1 of morphological figuresissued from : E. Suarez-Morales & V.V. Ivanenko in Arctic, 2004, 57 (1). [p.42, Table 1].
Comparison of taxonomic features and morphometry in females of selected species of Monstrillopsis.
A1 = antennule; AN = anal somite; CT = cephalothorax; FP = 1st pediger; GS = genital double-somite; LA = last antennular segment; TL = total length; UR = urosome. All ratios are presented in percentage form.

Species Monstrillopsis dubia - Plate 2 of morphological figuresIssued from : T. Scott in Rep. Fishery Bd Scotl., 1904, 12 (3). [Pl. XIII, fig.14]. As Monstrilla dubia.
Female (from Scotland): 14, habitus (dorsal).

Nota: Cephalothorax about one and a half times the entire length of the ramaining thoracic segments and abdomen.
Abdomen 3-segmented; the 1st segment about equal in size to the last thoracic segment, the 2nd is smaller rhan the next, while the 2nd and 3rd are together scarcely as long as the 1st segment.

Species Monstrillopsis dubia - Plate 3 of morphological figuresIssued from : T. Scott in Rep. Fishery Bd Scotl., 1904, 12 (3). [Pl. XIV, figs.16-18]. As Monstrilla dubia.
Female: 16, A1; 17, P5; 18, Abdomen and caudal rami.

Nota: A1 4-segmented, moderately stout, and about half as long as the cephalothoracic segment; the 1st and 3rd segments small, the 2nd is about half as long again as the 3rd, while the 4th is equal to the entire length of the 3 segments.
P5 narrow and sub-cylindrical at the proximal end, but becomes wider distally and terminates in 2 lobes; the outer lobe is larger than the inner and is furnished with 3 moderately long setae, the inner lobe is narrow and appears to be devoid of setae.
Caudal rami with 4 elongated hairs, one of them springs from near the base of the outer margin, 2 spring from the apex, while the 4th is attached on the inner aspect and near the middle of the segment.

Compl. Ref.:
? Bernier & al., 2002 (p.651, tab.1); Dias & Bonecker, 2007 (p.270, 272, fig.3, tab.II); Dvoretsky & Dvoretsky, 2010 (p.991, Table 2)
NZ: 3 + 2 doubtful

Distribution map of Monstrillopsis dubia by geographical zones
? [ G. of Maine, Bay of Fundy, Baie des Chaleurs, Ungava Bay, Cambois Bay & St. Mary's lighthouse], Scotland (Firth of Forth, Loch Fyne, Firth of Clyde), ? Banyuls, ? Norway, Barents Sea, North Sea, Brazil (Vitoria, Rio de Janeiro)
N: 9 ?
(727) F: 3,3; ? (748) F: 2,8-2,5; {F: 3,30}
Rem.: The north-American locality records are to be confirmed.
For Suarez-Morales (2011, p.6, 12) the once purportedly cosmopolitan M. dubia (T. Scott, 1904) is now known to contain at least three different species. After the author the species is resticted to Scotland (60°N). For the author, the records of M. dubia from the Southern hemisphere could refer to M. chilensis, M. igniterra, or undescribed taxa.
Last update : 20/01/2015
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Razouls C., de Bovée F., Kouwenberg J. et Desreumaux N., 2005-2016. - Diversity and Geographic Distribution of Marine Planktonic Copepods. Available at http://copepodes.obs-banyuls.fr/en 
[Accessed February 10, 2016]

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