Species Card of Copepod
Calanoida ( Order )
    Arietelloidea ( Superfamily )
        Augaptilidae ( Family )
            Euaugaptilus ( Genus )
Euaugaptilus fosaii  Pineda-Polo, 1979   (F)
Ref.:
Pineda-Polo, 1979 (p.13, Descr.F, figs.F)
Species Euaugaptilus fosaii - Plate 1 of morphological figuresIssued from : F.H. Pineda-Polo in Bol. Inst. Univ. Oriente, 1979, 18 (1-2). [p.14, Fig.1]
Female (from Cariaco Trench): a, habitus (dorsal); b, head (lateral); c, urosome (dorsal); d, genital segment and urosomal segments 2 and 3 (lateral).

Nota: Abdominal segments plus caudal rami 11% of the total body length.
- 1st abdominal segment represents 40% of the abdominal length while the next two segments make only 16% of it.
- Caudal rami form an angle of 110° with the longitudinal axis of the body; there are 3 lateral setae on each ramus, one posteriorly directed and 1 smaller dorsal-anteriorly directed.
- Genital segment slightly swollen ventrally.
- Forehead without rostral filaments.
- Cephalosome and pediger segment 1 separated, thoracic segments 1 and 2 fused, thoracic segment 5 smoothly rounded.
- A1 exceeds the body by the last 3 segments


Species Euaugaptilus fosaii - Plate 2 of morphological figuresIssued from : F.H. Pineda-Polo in Bol. Inst. Univ. Oriente, 1979, 18 (1-2). [p.14, Fig.2]
Female: a, A2; b, gnathobase and mandibular palp; c, gnathobase of Md (dorsal view); d, Mx1; e, Mx2; f, Mxp; g, P5; h, P1.

Nota: Endopod of A2 almost 3 times longer than exopod and it ends in a tuft of 6 plumose apical setae; exopod 7-segmented, 1st incompletely separated from the 2nd; segments 2, 3, 4, 5 and 6 bear 1 long plumose seta each, the 7th segment bears 5 long plumose apical setae.
- Md palp well developed with exo and endopod of equal size; endopod 3-segmented, with 2 setae on 1st segment (1 long and 1 short), 2nd segment bears no setae, the last segment bears 5 long setae; exopod 6-segmented, with 1 seta on segments 2, 3, 4 and 5, the last segment bears 3 setae; the gnathobase is curved proximally, with a rather thin arm, the teeth are transversaly set, the 1st one being straight and sharp, flaked by 2 smaller, one on each side and a terminal one, the 2nd one is a little curved and flanked by a tiny tooth found at mid-distance between its tip and the internal bottom edge.
- Mx1 well developed with a strong exopod ending in 3 long plumose curled setae and 2 smaller setae, 1 apical and 1 closer to the base; the 1st outer lobe bears 6 plumose setae , the 2nd outer lobe absent; the 1st inner lobe (= arthrite) bears 2 strong toothed spines and a 3rd strong but plumose spine, besides 2 thinner straight and 1 curled setae; the total number of setae on the 1st inner lobe is 6; the 2nd inner lobe bears 1 seta; the 3rd inner lobe bears 3 setae; the 2nd basipodal segment bears 5 long setae; the one segmented endopod bears 2 short plumose setae.
- Mx2 is strong and well developed; coxa and basis fused, the 1st, 2nd and 4th lobes bear a hairy setae each, the 5th lobe bears a strong toothed and a small naked setae; the 1st segment of the endopodite bears 1 strong and 2 small naked setae, the last 2 segments appear fused, bearing 6 long naked setae.
- Mxp strong, well developed and curved interiorly; basipodite 1 bears 2 straight setae internally and 2 small curved setae close to the exterior side of the base; basipodite 2 bears 2 small but straight internally set setae; the 1st segment of endopod bears 2 long and 2 short setae, the 2nd segment bears 1 long and 1 small setae, the 3rd segment bears 1 long setae, the last segment bears 2 very long and 1 very small setae.
- Both rami of P1 to P4 are 3-segmented.
- P1 has a long hairy setae arising from the internal side of the basipodite 1; the basipodite 2 bears an external dorsally directed seta. The exopodite 1 produces a long and sharp spine that extends well beyond the middle of exopodite 3; exopodite 2 bears 1 small external spine, exopodite 3 bears 3 external spines (1 of them is terminal) and 4 internal setae; the endopodite 1 bears 1 external seta, endopodite 2 bears 1 external and 1 internal setae, endopodite 3 bears 6 setae.
- P5 2-segmented endopodite and exopodite. Endopodite almost forms a straight angle with exopodite 1; basipodite 1 bears 1 internal seta, basipodite 2 bears 1external seta directed ventrally over the setae of the endopodite; endopodite 1 bears 1 internal seta, endopodite 2 bears 7 hairy setae; exopodite 1 produces 1 external spine, exopodite 2 has 3 external spines, 1 of which is terminal plus an apical spine, internally there are 4 hairy setae on exopodite 2.

NZ: 1

Distribution map of Euaugaptilus fosaii by geographical zones
Loc:
Eastern Venezuela (Cariaco Trench)
N: 1
Lg.:
(309) F: 2,8; {F: 2,80}
Rem.: epipelagic
For Pineda-Polo (1979, p.15) the present species belongs to group 1 of Tanaka & Omori (1974), since it has a Mx1 with setae on 1st and 3rd inner lobes. There are no rostral filaments; the outer lobe, exopod, endopod, 2nd basal segment and nor rostral protuberance as is the case for E. nodifrons.
The Mx1 is structurally similar to E. humilis,E. hyperboreus, E. maxillaris. However, the length of the endopod with respect to the exopod of A2 as well as the gnathobase set this species apart from these congeners. A another distinctive characteristic of this species is the presence of a two segmented P5. According to Matthews (1972) there could be some intraspecific variation in this character; however the only species reported up to now with 2-segmented P5 is E. hecticus. The present species can be easily distinguioshed from the latter by the general shape of the body and 1st abdominal segment; the presence of setae on the endopod, 2nd and 3rd inner lobes of the Mx1, as well as the relative size of the endopod and exopod of A2, are also distinctive.
Last update : 07/05/2016
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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 November 28, 2022]

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