Laboratory of Biodiversity, Parasitology and Ecology of Aquatic Ecosystems, Faculty of Sciences of Tunis, University of Tunis El Manar, 2092, Tunis, Tunisia.
Oceanic Observatory of Madeira, Agência Regional Para O Desenvolvimento da Investigação Tecnologia E Inovação. Edifício Madeira Tecnopolo, Funchal, Portugal.
Acta Parasitol. 2021 Jun;66(2):361-376. doi: 10.1007/s11686-020-00290-3. Epub 2020 Sep 30.
A new species of the genus Caligus is described based on specimens collected from pompano, Trachinotus ovatus (Linnaeus), caught in eastern Atlantic waters, near the Madeira archipelago.
Pompano (n = 21) were purchased from the local fish market and examined for parasitic copepods. Morphological features of the copepods were examined and drawn using an Olympus BX51 equipped with a drawing tube. Key diagnostic characters were scanned using a confocal laser scanning microscope and a scanning electron microscope.
Caligus madeirensis sp. nov., can be distinguished from all congeners (270 spp.) by the combination of the following characters: (i) an accessory process on the 3 outer terminal spines located on the distal exopodal segment of leg 1, (ii) a mandible with 14 teeth, (iii) a sternal furca with parallel, spatulate tines, (iv) a maxilliped with 2 simple setae at base of a claw, (v) a leg 3 with second endopodal segment with 5 pinnate setae, (vi) a 2-segmented leg 4 exopod with I; III spine formula, (vii) a male antenna with 4 overlapping plates on the distal segment, (viii) a male maxilliped corpus bearing a prominent myxal process ornamented with dense corrugations along inner margin.
Together with Caligus madeirensis sp. nov., the Caligus fauna of Portugal consists of 13 species reported from 17 Portuguese marine fishes. Considering the large number of marine fish species (510 spp.) currently recorded from Portuguese waters it seems that only 3.3% of the Portuguese marine fishes have been found to be infested with species of the genus Caligus O.F. Müller, 1758, the result of which, however, might be due to limited sampling.
本文基于在大西洋东部马德拉群岛附近采集的鲈 Trachinotus ovatus（Linnaeus）标本，描述了一新种 Caligus。
从当地鱼市购买鲈（n = 21），检查其寄生的桡足类。使用配备有绘图管的 Olympus BX51 检查桡足类的形态特征并绘制图像。使用共聚焦激光扫描显微镜和扫描电子显微镜扫描关键诊断特征。
Caligus madeirensis sp. nov. 可通过以下特征与所有近缘种（270 种）区分开来：（i）腿 1 的远端外肢上的 3 个外端刺上的附属突起，（ii）具 14 齿的颚，（iii）胸骨叉具平行的匙形叉齿，（iv）具 2 个简单刚毛的基节的大颚，（v）腿 3 的第二内肢具 5 个羽状刚毛，（vi）具 2 节外肢的腿 4 外肢具 I; III 刺式，（vii）具 4 个重叠板的远端节段的雄性触角，（viii）具明显的粘液突起的雄性大颚体，内缘具密集的皱纹。
与 Caligus madeirensis sp. nov. 一起，葡萄牙的 Caligus 动物群由 17 种从葡萄牙 17 种海洋鱼类中报告的物种组成。考虑到目前从葡萄牙水域记录的大量海洋鱼类物种（510 种），似乎只有 3.3%的葡萄牙海洋鱼类被 Caligus O.F. Müller，1758 属的物种寄生，然而，其结果可能是由于采样有限。
