Fiche d'espèce de Copépode
Calanoida ( Ordre )
    Arietelloidea ( Superfamille )
        Arietellidae ( Famille )
            Scutogerulus ( Genre )
Scutogerulus boettgerschnackae  Ohtsuka & Boxshall, 2004   (F)
Ref.:
Ohtsuka & Boxshall, 2004 (p.50, Descr.F, figs.F)
Espèce Scutogerulus boettgerschnackae - Planche 1 de figures morphologiquesIssued from : S. Ohtsuka & G.A. Boxshall in Syst. Biodiv., 2004, 2 (1). [p.50, Fig.1].
Female (from 26°19.18'N, 127°25.56'E): A-B, habitus (dorsal and lateral, respectively); C, posterior margin of prosome and genital double-somite (lateral); D, forehead with rostrum (ventral); E, urosome and posterior margin of prosome (dorsal); F, genital double-somite (ventral view; gonopore indicated by large arrowhead and copulatory pore indicated by small arrowhead); G, genital system, gonopore (indicated by large arrowhead) and copulatory pore (small arrowhead); H, A1, first (I-II) to 16th (XVIII) segments (posterior row of setules missing); I, A1 17th (XIX) to 23rd (XXVI-XXVIII) segments; J, posterior row of setules of first three segments; K, last two antennulary segments (XXIV-XXV and XXVI-XXVIII).

Nota: - Prosome 2.5 times longer than urosome.
- Cephalosome incompletely fused to 1st pediger, 4th and 5th pedigers completely fused.
- Posterolateral angles of prosome ends produced into round processes reaching beyond middle of genital double-somite.
- 2nd and 3rd pedigers each produced postero ventrolaterally into round projection.
- Urosome 4-segmented.
- Genital double-somite swollen laterally at midlength. Genital system paired and symmetrically arranged; gonopore and copulatory pore sharing common slit, located anteriorly and posteriorly, respectively; seminal receptacle compact.
- 2nd urosomite nearly as long as 3rd.
- Caudal rami symmetrical, inner margins ornamented with fine setules; minute seta I located anterolaterally; seta V longest; seta VII originating dorsally from inner distal corner.
- A1 indistinctly 23-segmented, extending to distal margin of 3rd urosomite.


Espèce Scutogerulus boettgerschnackae - Planche 2 de figures morphologiquesIssued from : S. Ohtsuka & G.A. Boxshall in Syst. Biodiv., 2004, 2 (1). [p.52, Fig.3].
Female: A, A2; B, exopod of A2; C, Md (cutting edge); D, Md palp; E, Mx1; F, Mx1 basis and endopod (vestigial seta on basis arrowed); G, Mx2; H, basal spine of Mx2; I, Mxp (with setae a and b labelled); J, seta of mxp endopod with modified 'shield-shaped' setules; K, two apostome phoronts (?) on maxillipedal setae.

Nota: - A2 with 2-segmented endopod and indistinctly 9-segmented exopod; setal formula of exopod 0, 0, 1, 1, 1, 1, 1, 0, 3; proximal endopodal segment unarmed, distal segment with 2 unequal setae subterminally (representing armature of 2nd endopodal segment) and 5 setae terminally.
- Md cutting edge with 1 mono-, 1 bi- and 1 tri-cuspidate teeth and 2 patches of short spinules. Md palp with basis bearing row of setules; endopod rudimentary, 1-segmented, with 2 unequal setae terminally; exopod 5-segmented, setal formula 1, 1, 1, 1, 2.
- Mx1 with praecoxal arthrite bearing 1 short process, 4 spinulose spines and row of fine setules; coxal epipodite with 6 setae; coxal endite with 1 long spinulose seta; basis bearing 1 vestigial element (see fig.3F arrowed) and 2 rows of fine setules; endopod bulbous, with 1 short, spinulose seta terminally; exopod lamellar, with 3 long, plumose setae at tip.
- Mx2 relatively delicate in comparison to those of other arietellids; 1st praecoxal endite with 1 spinulose seta and rudimentary element; 2nd praecoxal endite with single seta; 1st and 2nd coxal endites each with 2 spinulose setae; basis bearing stout, spinulose spine (fig.3H); endopod 4-segmented, setal formula 1, 3, 2, 2; all endopodal setae ornamented with row of modified 'shield-like' setules.
- Mxp with syncoxa bearing 3 spinulose setae subterminally; basis with 2 spinulose setae and dense patch of short spinules; 1st endopodal segment incompletely incorporated into basis, with 1 spinulose seta; 2nd to 6th endopodal segments with setation 4, 4, 3, 3, 4, including 1, 1, 2, 2, 2 shield-like setae, respectively; setae 'a' nand 'b' rudimentary.


Espèce Scutogerulus boettgerschnackae - Planche 3 de figures morphologiquesIssued from : S. Ohtsuka & G.A. Boxshall in Syst. Biodiv., 2004, 2 (1). [p.53, Fig.4].
Female: A, P1 (anterior); B, P2 (anterior); C, P3 (anterior); D, P4 (posterior; E, right P5 and intercoxal sclerite; (anterior; arrowhead showing putative vestigial exopod); F, left P5 (posterior).

Nota: P5 nearly symmetrical, each leg consisting of lamellar plate incompletely fused to intercoxal sclerite; lamellar plate with long plumose seta subterminally and shorter one on posterior surface; small, subterminal or terminal knob on each plate possibly representing exopod (see in SEM micrographs fig.2C).


Espèce Scutogerulus boettgerschnackae - Planche 4 de figures morphologiquesIssued from : S. Ohtsuka & G.A. Boxshall in Syst. Biodiv., 2004, 2 (1). [p.53].
Female: Setal and spine formula of swimming legs P1 to P4.
Spines are denoted by Roman numerals and setae by Arabic numerals.


Espèce Scutogerulus boettgerschnackae - Planche 5 de figures morphologiquesIssued from : S. Ohtsuka & G.A. Boxshall in Syst. Biodiv., 2004, 2 (1). [p.51, Fig.2].
Female (SEM micrographs): A, genital double-somite, ventral view, gonopores and copulatory pores indicated large and small arrows, respectively, left side damaged; B, right gonopore (indicated by large arrow) and copulatory pore (by small arrow); C, left P5, anterior surface, vestigial exopod (?) indicated by arrow; D-G, 'shield setae' on maxillary endopod.
Scale bars: 0.1 mm (A); 0.01 mm (B, D); 0.02 mm (C); 0.002 mm (E-G).

NZ: 1

Carte de distribution de Scutogerulus boettgerschnackae par zones géographiques
Loc:
East China Sea (Okinawa: off Kuroshima Island).

Type locality: 26°19.18' N, 127°25.56' E.
N: 1
Lg.:
(980) F: 2,79-3,01; {F: 2,79-3,01}
Rem.: hyperbenthic (596-606 m).
For Ohtsuka & Boxshall (2004, p.54) the following phylogenetically important, generic characteristics are reconfirmed by the discovery of this new species: 1- the primitive female genital system (plesiomorphy); 2 - the presence of modified 'shield-shaped' setules on the setae on the maxillary and maxillipedal endopods (autapomorphy): 3 - the loss of the outer distal spine from the first exopodal segment of P1 (autapomorphy). The type of female genital system in which a gonopore and a copulatory pore share a common slit is retained in the most primitive calanoid family Pseudocyclopidae and probably in the Boholinidae. In the Arietellidae only Scutogerulus retains such a system. This symplesiomorphy has previously been regarded as evidence of a close relationship between the Arietellidae and the Pseudocyclopidae by Andronov (1974), Park (1986) and Bradford-Grieve (2002).
Dernière mise à jour : 08/03/2015

 Toute utilisation de ce site pour une publication sera mentionnée avec la référence suivante :

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 25 février 2021]

© copyright 2005-2021 Sorbonne Université, CNRS

Webmaster
Mentions légales et informations nominatives
CNRS   Observatoire Océanologique de Banyuls sur Mer - Laboratoire Arago
Sorbonne Université

 

Version française
English version

 

Rechercher

Sur le WEB du CNRS

 


Copépodes planctoniques marins

Copépodes planctoniques marins

 

Imprimer Contact Accueil Plan du site Accès restreint Retour Une du Labo Imprimer Contact Plan du site Crédits Téléchargez les Plug-Ins