We review the occurrence of the diatom genus Actinella Lewis in Hawai‘i. Based on collections from the islands of Kaua‘i, Moloka‘i, and Hawai‘i, we have documented the presence of three species of the genus. Using light and scanning electron microscopy, we illustrate these species, two of which are new to science and described here. Actinella punctata Lewis is distinct in having a bulbous headpole with a short extension at the dorsal margin and a large extension on the ventral margin. This species was observed from Hawai‘i and Moloka‘i. Actinella hawaiiensis Ripple & Kociolek, n. sp., is distinguished by its headpole extension being produced from the dorsal margin, whereas A. molokaiensis Ripple & Kociolek, n. sp., has a headpole protuberance near the center of the apex. Both of the new species are found on the islands of Kaua‘i and Molokai‘i. A previously described endemic, A. punctata var. alakaiensis Main, was not encountered in our collections. Three of the four Actinella taxa from Hawai‘i are currently known as endemics and appear to have their closest allies in either North and/or South America, similar to observations for Gyrosigma krammeri Kociolek et al., another diatom species in Hawai‘i. Further research is necessary to determine the biogeographic patterns of the freshwater diatom flora of Hawai‘i.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 67 • No. 4