Species Card of Copepod
Monstrilloida ( Order )
    Monstrillidae ( Family )
        Monstrillopsis ( Genus )
Monstrillopsis nanus  Surarez-Morales & McKinnon, 2014   (M)
Ref.:
Suarez-Morales & McKinnon, 2014 (p.311, Descr.M, figs.M, Rem.)
Species Monstrillopsis nanus - Plate 1 of morphological figuresIssued from : E. Suarez-Morales & A.D. McKinnon in Zootaxa, 2014, 3779 (3). [p.312, Fig.6].
Male (from 22°28'S, 114°20.75'E): A-B, habitus (lateral and dorsal, respectively); C-D, urosome (dorsal and ventral, respectively.
Scale bars: A, B = 100 µm; C, D = 50 µm.

Nota: Cephalothorax representing 50 % of total body length (measured from the anterior end of cephalothorax to the posterior end of the anal somite).
A1 relatively long, 1.15 times as long as cephalothorax and representing 48 % of total body length..
Oral papilla small, located anteriorly, about 35 % of way back along ventral surface of cephalothorax.
1st pedigerous somite incorporated into cephalothorax.
P5 absent.
Urosome consisting of 4 somoites: 5th pedigerous somite, genital somite with genital apparatus, 1 free postgenital somite and large anal somite (possibly incorporating fused preanal somite as described in M. hastata).
Anal somite comprising 35 % of length of urosome.
Dorsal surface of genital somite with row of hyaline papillae along distal margin; ventral surface forming enlarged base of short, cylindrical shaft with distal genital lappets. Genital complex of type II. Lappets represented by pair of short, posteriorly directed but moderately divergent bulbous processes (fig.6C, D); lappets reaching to about midlength of anal somite.
Caudal rami subrectangular, weakly divergent, approximately 1.8 times longer than wide, each ramus bearing 5 setae.


Species Monstrillopsis nanus - Plate 2 of morphological figuresIssued from : E. Suarez-Morales & A.D. McKinnon in Zootaxa, 2014, 3779 (3). [p.313, Fig.7].
Male: A, right A1 (dorsal view); B, detail of arranggement of setal elements 4v and 4d on 4th segment of A1; C, cephalic area showing rugose forehead surface (dorsal); D, same (ventral).
Scale bars: A, C, D = 50 µm; B = 10 µm.

Nota:
Pair of relatively small ocelli present, pigment cups moderately developed, separated by less than half eye diameter, weakly pigmented on outer rim; ventral cup slightly larger than lateral cups.
Forehead nubbly, with medial rounded protrusion (fig.7C, D).
Ventral surface of cephalic area with single pair of nipple-like cuticular processes and adjacent field of transverse cuticular striations between A1 bases and oral papilla (fig.7D).
A1 5-segmented, geniculate.


Species Monstrillopsis nanus - Plate 3 of morphological figuresIssued from : E. Suarez-Morales & A.D. McKinnon in Zootaxa, 2014, 3779 (3). [p.314, Fig.8].
Male: A, P1; B, P3 showing intercoxal sclerite; C, P4.
Scale bars: A-C = 100 µm.

Armature formula of swimming legs as in M. hastata.

NZ: 1

Distribution map of Monstrillopsis nanus by geographical zones
Loc:
W Australia (Giralia Bay, Exmouth Gulf)

Type locality: 22°28'S, 114°20.75'E.
N: 1
Lg.:
(1149)* M: 0,50; {M: 0,50}



* Body length measured from the anterior end of cephalothorax to the posterior end of the anal somite.
Rem.: After Suarez-Morales & McKinnon (2014, p.314) the species is the smallest Monstrillopsis known.
After Lee J. & al; (2016, p.421), genitalia male with a well developed, long median shaft and relatively short, ovoidal or globose lateral lappets that are more or less separated from the median shaft belongs subgroup ''Type I'' (Suarez-Morales & McKinnon, 2014).
Last update : 07/12/2017
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2021. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed June 13, 2021]

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