Baldinia droopii sp. nov. (Suessiales, Dinophyceae), a new species from a small rainwater rock pool near Tvärminne, south-western Finland

IF 1.5 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY

Phycologia Pub Date : 2022-12-15 DOI:10.1080/00318884.2022.2142430

G. Hansen, N. Daugbjerg, Ø. Moestrup

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引用次数: 2

Abstract

ABSTRACT A dinoflagellate isolated from a small rainwater rockpool in Finland was found to be a new species of Baldinia, here described as B. droopii sp. nov. This is only the third formally described Baldinia species and the second described by modern methods. The new species had a complement of generic characters that clearly affiliated it to Baldinia: presence of an internal honeycomb structure, termed a lamellar body, a ventral fibre associated with the longitudinal basal body and a pentagonal resting cyst; and the absence of an apical structure, thecal plates and trichocysts. The most distinctive species-specific characters were the presence of a resting cyst with tubiform processes, a paratabulation matching the pattern of the motile cell, and a life cycle exhibiting a diel rhythm, alternating between motile and non-motile coccoid cells. Motile cells occurred during the light period, peaking after 3–4 h of light period, while practically no motile cells occurred during the dark period. LSU rDNA sequences confirmed B. droopii as a new species, showing c. 14% sequence difference compared to B. anauniensis. Asexual reproduction occurred primarily by binary fission or via a so-called division cyst. Sexual reproduction occurred in the culture indicating that D. droopii is homothallic. The zygote may form a resistant cyst with tubiform processes, but there were indications that this stage may be by-passed. Different stages of the asexual and putative sexual reproduction were observed and documented by video recordings.

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Baldinia droopii sp.nov.（Suessiales，Dinophyceae），来自芬兰西南部Tvärminne附近一个小型雨水岩石池的一个新种

摘要从芬兰一个小型雨水岩池中分离出的甲藻被发现是巴尔迪尼亚的一个新种，本文将其描述为B.droopii sp.nov。这是第三个被正式描述的巴尔迪尼亚物种，也是第二个被现代方法描述的物种。这个新物种有一系列的共性特征，这些特征显然将其与巴尔迪尼亚属联系在一起：存在一个内部蜂窝状结构，称为层状体，一个与纵向基体相关的腹侧纤维和一个五角形静止囊肿；以及没有顶端结构、鞘板和毛囊肿。最独特的物种特异性特征是存在一个具有管状突起的静止囊肿，一个与运动细胞模式相匹配的分离，以及一个表现出昼夜节律的生命周期，在运动和非运动的球状细胞之间交替。运动细胞出现在光照期，在光照3-4小时后达到峰值，而在黑暗期几乎没有运动细胞出现。LSU rDNA序列证实了B.droopii是一个新物种，与B.anauniensis相比显示出约14%的序列差异。无性繁殖主要通过二元分裂或所谓的分裂囊肿发生。在培养基中发生了有性繁殖，表明D.droopii是同源性的。受精卵可能形成具有管状突起的抗性囊肿，但有迹象表明这一阶段可能是旁路。无性繁殖和假定性繁殖的不同阶段被观察到，并通过录像记录下来。

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来源期刊

Phycologia 生物-海洋与淡水生物学

CiteScore

3.10

自引率

18.80%

发文量

审稿时长

3 months

期刊介绍： Phycologia is published bimonthly by the International Phycological Society and serves as a publishing medium for information about any aspect of phycology. Membership in the Society is not necessary for publication. Submitted manuscripts cannot be previously published or submitted elsewhere. Copyright ownership of all accepted papers is held by the International Phycological Society.