Species Card of Copepod
Mormonilloida ( Order )
    Mormonillidae ( Family )
        Neomormonilla ( Genus )
Neomormonilla extremata  Ivanenko & Defaye, 2006   (F)
Ivanenko & Defaye, 2006 (p.711, figs.F, Rem., p.724)
Species Neomormonilla extremata - Plate 1 of morphological figuresissued from : V.N. Ivanenko & D. Defaye in Crustaceana, 2006, 79 (6). [p.712, Fig.1].
Female (from 12°42.78'N,103°51.9'W): A, habitus (dorsal); B, cephalothorax (ventral); C, urosome (ventral); D, left caudal ramus (ventral); E, distal part of left caudal ramus (ventral); F, labrum, inner side.

Nota: Rostrum shaped as a short and broad frontal plate and ending in one acute, semi-free point on each lateral side, and with 2 sensilla. Prosome comprising cephalothorax and 3 somites bearing legs 2-4. Lateral margins of somites bearing legs 2-4, 1st urosomal somite and genital double-somite with rows of long setules. Urosome 4-segmented comprising pedigerous somite lacking P5, genital double-somite, and 2 abdominal somites. Labrum massive, proximal part ornamented with long, stout setules ; paragnaths with lobes ornamented with setules, separated by a conical protrusion of the cephalon. Caudal rami as long as urosome, about 20 times as long as wide, each ramus bearing 6 setae (5 distal and 1 proximolateral).

Species Neomormonilla extremata - Plate 2 of morphological figuresissued from : V.N. Ivanenko & D. Defaye in Crustaceana, 2006, 79 (6). [p.714, Fig.2].
Female: A, genital double-somite (ventral); B, 1st somite of urosome and genital double-somite (lateral), left side); C, anal somite (ventral); D, A1; E, A2.

Nota: A1 3-segmented, extending to genital somite ; surface of segments ornamented with rows of small setules ; 1st segment as long as two distal segments combined. A2 comprising coxa, basis, 2-segmented endopod, and 8-segmented exopod ; endopodal and exopodal segments ornamented with slender setules. P5 absent ; P6 represented as a pair of triangular flaps covering the gonopores (Fig.2A).

Species Neomormonilla extremata - Plate 3 of morphological figuresissued from : V.N. Ivanenko & D. Defaye in Crustaceana, 2006, 79 (6). [p.715, Fig.3].
Female: A, Md; A', Md (masticatory edge); B, Mx1 (posterior; distnctive seta arrowed); B1, praecoxal endite of Mx1; C, Mx2 (anterior); D, Mxp (anterior).
Nota: Md comprising coxal gnathobase, basis, 1-segmented endopod, and 4-segmented exopod; masticatory edge with 8 teeth and ornamented with small setules ; basis ornamented with setules and armed with 3 inner setae (1 proximal and 2 distal) ; endopod bearing 6 setae ; exopodal segments armed with 2, 1, 1, and 2 setae. Mx1 comprising praecoxal arthrite bearing 7 spines ; protopod representing fused coxa and basis ; and 1-segmented ; praecoxal arthrite ornamented with spinules and bearing 7 terminal setae of different lengths ; protopod with 6 inner and 2 outer setae ; endopod bearing 8 long and 1 short setae ; exopod ornamented with spinules and bearing 6 long and 1 short setae. Mx2 5-segmented. Mxp 3-segmented.

Species Neomormonilla extremata - Plate 4 of morphological figuresissued from : V.N. Ivanenko & D. Defaye in Crustaceana, 2006, 79 (6). [p.717, Fig.4].
Female: A, P1 (posterior); A1, distal exopodal segments of P1 (posterior; small curved spinules arrowed); B, P2; B1, proximal exopodal segment of P2 (posterior); C, P3 (posterior); C1, proximal exopodal segment of P3 (posterior); D, P4 (posterior).

NZ: 1

Distribution map of Neomormonilla extremata by geographical zones
East Pacific Rise (Seamount “Marginal High“)
N: 1
(959) F: 1,7; {F: 1,70}
Rem.: More closely similar to N. polaris than to N. minor.
According to Ivanenko & Defaye (2006, p.718) the finding of N. extremata constitutes the first record of mormonillids from deep sea chemosynthetic (hydrothermal vent) communities. This species were found at the periphery of the hydrothermal vent community and were accompanied by other planktonic and near-bittom copepods. The authors consider this species as a facultative (= non-obligate) member of the hydrothermal vent community linked to this environmental factors.
Last update : 24/01/2015
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Razouls C., Desreumaux N., Kouwenberg J. and de Bovée F., 2005-2022. - Biodiversity of Marine Planktonic Copepods (morphology, geographical distribution and biological data). Sorbonne University, CNRS. Available at http://copepodes.obs-banyuls.fr/en [Accessed August 13, 2022]

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