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Morphology and sexual dimorphism of living mature adults of Amphiduros fuscescens (Marenzeller, 1875) (Annelida, Hesionidae, Amphidurine), first reported for the Iberian Peninsula
Biodiversity Data Journal ( IF 1.3 ) Pub Date : 2021-05-19 , DOI: 10.3897/bdj.9.e66020
Daniel Martin 1 , Chiara Romano 1
Affiliation  

Background To date, the genus Amphiduros (Annelida: Hesionidae: Amphidurine) is considered as monotypic. Its single species, Amphiduros fuscescens (Marenzeller, 1875), is well characterised by lacking proboscideal papillae and emerging acicular chaetae, as well as by having three antennae, eight pairs of tentacular cirri and inflated dorsal cirri with characteristic alternating length and colour (transparent, with median orange band and white tips) in live animals. New information Three specimens, one male and two females, were found below boulders at 5–7 m depth in Punta Santa Anna, Blanes and Cala Maset, Sant Feliu de Guixols (Catalan Sea, NW Mediterranean, Iberian Peninsula). Our finding allowed us to describe different, unreported morphological traits and lead us to support the existence of sexual dimorphism (in terms of colouring, cirri morphology and distribution of sexual products along the body). Despite A. fuscescens having been previously reported from the Atlantic and the Mediterranean (particularly in SE French coasts), the specimens from Blanes represent the first record of the species from the Iberian Peninsula. In addition, our molecular results strongly support that Amphiduros pacificus Hartman, 1961 from California (currently synonymised with A. fuscescens) requires to be re-described and reinstalled as a valid species. In turn, our morphological observations support suggesting all other non-Mediterranean reports of A. fuscescens, including the species still under synonymy (i.e. Amphidrornus izukai Hessle, 1925 and Amphidromus setosus Hessle, 1925) as likely being a cryptic species complex whose the taxonomic status requires further assessment.

中文翻译:

雄性两栖生活成虫的成熟成年人的形态学和性二态性(Marenzeller,1875年)(Annelida,Hesionidae,Amphidurine),首次报道于伊比利亚半岛

背景技术迄今为止,两栖类(Amphiduros)(Annelida:Hesionidae:Amphidurine)被认为是单型的。它的单一物种Amphiduros fuscescens(Marenzeller,1875)的特征是缺乏前鞭毛乳头和新兴的针状龟背壳,并且具有三个触角,八对触角触角和膨大的背触角,其长度和颜色具有交替性(透明,并带有中位数的橙色带和白色尖端)。新信息在蓬塔圣安娜,蓬特里乌德吉克索斯(加泰罗尼亚海,地中海西北部,伊比利亚半岛)的蓬塔圣安娜(Punta Santa Anna),布拉内斯(Blanes)和卡拉马塞特(Cala Maset)的巨石下面发现了三具标本,其中一具雄性,两具雌性。我们的发现使我们能够描述不同的,未报告的形态特征,并促使我们支持性二态性的存在(在颜色,cirri形态和性产物在体内的分布)。尽管先前已经从大西洋和地中海地区(特别是在法国东南沿海)报道了镰刀菌,但布拉内斯的标本仍是伊比利亚半岛物种的第一个记录。此外,我们的分子结果强烈支持要求重新描述加利福尼亚州的Amphiduros pacificus Hartman(现为A.fuscescens),1961年,将其重新描述并重新安装为有效物种。反过来,我们的形态学观察结果表明,所有其他非地中海报道的福建曲霉,包括仍为同义词的物种(即Amphidrornus izukai Hessle,1925年和Amphidromus setosus Hessle,1925年)很可能是隐喻物种复合体,其分类学地位需要进一步评估。
更新日期:2021-05-19
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