Fiche d'espèce de Copépode
Monstrilloida ( Ordre )
    Monstrillidae ( Famille )
        Monstrillopsis ( Genre )
Monstrillopsis boonwurrungorum  Surarez-Morales & McKinnon, 2014   (M)
Ref.:
Suarez-Morales & McKinnon, 2014 (p.308, Descr.M, figs.M, Rem.); Grygier & Suarez-Morales, 2018 (p.505: Rem.).
Espèce Monstrillopsis boonwurrungorum - Planche 1 de figures morphologiquesIssued from : E. Suarez-Morales & A.D. McKinnon in Zootaxa, 2014, 3779 (3). [p.309, Fig.4].
Male (from 38°2.583'S, 144°57.08'E): A-B, habitus (dorsal and lateral, respectively); C, cephalic area showing medioventral protuberance (arrow), lateral view); D, cephalic area showing faint nipple-like ventral processes (arrow), ventral view; E, urosome showing genital complex (ventral).
Scale bars: A, B = 200 µm; C-E = 100 µm.

Nota: Cephalothorax representing almost 50 % of total body length (measured from the anterior end of the head to the posterior end of the anal somite).
A1 5-segmented, geniculate, about as long as cephalothorax.
Oral papilla small, located anteriorly, about 26 % of way back along ventral surface of cephalothorax.
Pair of relatively large ocelli present, pigment cups modetately developed, separated by less than half eye diameter, weakly pigmented; ventral cup slightly larger than lateral cups.
Forehead rounded, moderately protuberant, with no observable cuticular ornamentation
Ventral surface of cephalic area bearing low, rounded process between bases of A1 (arrowed in fig.4C). 1 pair of weakly developed nipple-like cuticular processes on anterior ventral surface between A1 bases and oral papilla (fig.4D). Otherwise, cephalic ventral surface smooth except for faint preoral horizontal striations (figs.4C, D) .
1st pedigerous somite incorporated into cephalothorax.
P5 absent.
Urosome consisting of 5 somites: 5th pedigerous somite, genital somite with genital apparatus, 2 free postgenital somites. Preanal and anal somites partially fused, with suture visible in ventral view (arrow in fig.4E) and bilateral intersomite constriction.


Espèce Monstrillopsis boonwurrungorum - Planche 2 de figures morphologiquesIssued from : E. Suarez-Morales & A.D. McKinnon in Zootaxa, 2014, 3779 (3). [p.310, Fig.5].
Male: A, P2 with outer basipodal seta of third swimming leg (arrow); B, detail of ornamentation of outer apical spiniform seta of 3rd exopodal segment of P2; C, urosome showing genital complrx (dorsal); D, same (lateral); E, right A1 (dorsal view).
Scale bars: A, C-E = 100 µm; B, 25 µm.

Nota: Armature formula of swimming legs as in M. hastata.
Ventral surface of genital somite forming enlarged base of cylindrical shaft with elongate distal genital lappets. Genital complex of type II. Lappets represented by pair of posteriorly directed, divergent, arm-like processes with rounded tips. Lappets reaching to midlength of anal somite (fig.5C, D).
Caudal rami subrecrangular, weakly divergent, approximately 1.5 times longer than wide, each ramus bearing 4 setae.

NZ: 1

Carte de distribution de Monstrillopsis boonwurrungorum par zones géographiques
Loc:
SE Autralia (Port Phillip Bay)

Type locality: 38°2.583'S, 144°57.08'E.
N: 1
Lg.:
(1149)* M: 0,91; {M: 0,91}
*: Total body length measured from the anterior end of the head to the posterior end of the anal somite.
Rem.: For Suarez-Morales & McKinnon (2014, p.311) this species shares several characters with its Australian congener M. hastata but differs from the latter by 1- the presence of an antero-ventral cephalic protuberance (absent in hastata); 2- the presence of a ventral suture and lateral constriction dividing the preanal and anal somites (vs. fused somites in hastata); 3- a relatively longer distal sabre-like process of the 5th antennular segment (58 % of that segment's length in hastata vs. 64 % in the present species); 4- the lack of ornamentation on the same segment's proximal rounded process, which has a row of 4 spiniform elements in hastata; 5- the subquadrate intercoxal plates, vs. rectangular plates in hastata; 6- the distally rounded lappets of the genital complex vs. distally attenuated lappets with nipple-like tips in hastata; in addition, the perioral cuticular ornamentation and the development of the post-antennular nipple-like processes are weaker in boonwurrungorum (see fig.4D) than in hastata (see fig.2A in M. hastata).
This male specimen differs from all its known congeners in having a very long sabre-like distal part of the 5th antennular segment, comprising more than 60 % the length of the segment, and a smooth proximal inner rounded protuberance on that segment.
After Lee J. & al. (2016, p.421), male genitalia with a relatively short median shaft with its posterolateral corners extended as elongate lappets belong subgroup ''Type II'' (Suarez-Morales & McKinnon, 2014).
Dernière mise à jour : 17/02/2020

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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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