Egg masses and larval development of the Antarctic cephalaspidean snail Waegelea antarctica (Cephalaspidea: Antarctophilinidae), with notes on egg masses of the related Antarctophiline alata

Egg masses and larval development of the Antarctic cephalaspidean snail Waegelea antarctica (Cephalaspidea: Antarctophilinidae), with notes on egg masses of the related Antarctophiline alata
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南极头螺蜗牛 Waegelea antarctica(头螺总科:Antarctophilinidae)的卵块和幼虫发育,以及相关 Antarctophiline alata 卵块的注释

DOI:
10.1093/mollus/eyab027
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发表时间:
2021
影响因子:
1.2
通讯作者:
Marko, P B
Marko, P B
中科院分区:
生物学3区
文献类型:
--
作者:
Moran, A L;Toh, M-W A;Lobert, G T;Ely, T;Marko, P B

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我们首次描述了最近描述的南极philinoid蜗牛Waegelea antarctica的卵群和幼虫发育模式。卵团类似于许多温带philinoid物种的胶状,附着的团块,含有非常大的后代,孵化为发育先进的具有许多幼崽特征的veligers。像其他南极异枝卵团一样,在w。尽管内部氧气含量很低,但南极洲似乎基本上是同步的。孵化出的幼虫既能游泳又能爬行,我们在几天内没有观察到变态。利用细胞色素氧化酶亚基I (COI)进行的分子条形码分析显示,在罗斯海麦克默多湾采集的样本与在8000公里外的威德尔海采集的样本的单个序列几乎完全匹配(差异<0.002%),这表明要么是幼虫的高度分散,要么是最近的范围扩大。我们还描述了来自罗斯海的相关南极海鸡(使用COI条形码识别)的卵质量,与已发表的描述不同,它们的胚胎要小得多。
We describe, for the first time, egg masses and larval developmental mode of a recently described Antarctic philinoid snail,Waegelea antarctica. Egg masses resembled the gelatinous, attached masses of many temperate philinoid species and contained very large offspring that hatched as developmentally advanced veligers with many juvenile features. Like other Antarctic heterobranch egg masses, development in the masses ofW. antarcticaappeared to be largely synchronous despite low internal oxygen levels. Hatched larvae could both swim and crawl, and we did not observe metamorphosis over several days. Molecular barcoding using cytochromecoxidase subunit I (COI) showed an almost perfect (<0.002% difference) match between our specimens from McMurdo Sound in the Ross Sea and a single sequence from a specimen collected >8,000 km away in the Weddell Sea, suggesting either high realized larval dispersal or a recent range expansion. We also describe the egg mass of the relatedAntarctophiline alata(identified using COI barcoding) from the Ross Sea, which differed from published descriptions in having considerably smaller embryos.
揭开南极软体动物谱系的面纱:来自 philinoid 蜗牛(腹足纲:头足纲)的新证据
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