Derbesia maxima sp. nov. (Bryopsidales, Chlorophyta) from Korea based on morphological and molecular data
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23RD INTERNATIONAL SEAWEED SYMPOSIUM, JEJU
Derbesia maxima sp. nov. (Bryopsidales, Chlorophyta) from Korea based on morphological and molecular data Jae Woo An 1 & Pil Joon Kang 1 & Ki Wan Nam 1 Received: 27 July 2019 / Revised and accepted: 9 October 2019 # Springer Nature B.V. 2019
Abstract A green alga was collected from Daejin, located on the eastern coast of Korea. It shows a typical siphonous thallus structure composed of erect and prostrate filaments like other Derbesia sporophytes and is characterized by a relatively large sporophytic thallus (6–8 cm) without calcified attachment disk, irregularly or subdichotomously branched filaments with a basal septum and 1(2) pyrenoid per ovoid to lenticular, occasionally irregular chloroplast. Sporangia have an obovoid or pyriform shape with a short pedicel and septum at the base. Vesicular gametophytes are spherical or ovoid, with short anchoring stalk and rhizoids. A heteromorphic life history alternating between sporophytic filaments and gametophytic Halicystis stage was observed. In a phylogenetic tree based on rbcL sequence, the Korean entity nests in a sister clade to several species groups including the type Derbesia marina, and of these species, D. fastigiata is closest to the Korean alga with a genetic divergence of 3.1%. However, it is distinguished from the Korean species by the size of sporophytic thalli, branching pattern, basal constriction of laterals, and shape of sporangia. The other species forming the sister clade are also distinguished from the Korean entity by general morphological features of sporophytes and gametophytes. The specific distinction of the Korean alga from those species is supported by its genetic divergence, which is considered to be involved in the inter-specific range for the genus based on the previous data. Accordingly, Derbesia maxima sp. nov. is proposed for this siphonous green alga from Korea. Keywords Morphology . New species . rbcL sequence . Siphonous green alga . Bryopsidales
Introduction Derbesia Solier is one of the siphonous green algal genera belonging to the Bryopsidales. This genus was established based on Derbesia marina (Lyngbye) (Solier 1846), originally described from Denmark (Lyngbye 1819). Derbesia shows an alternation of heteromorphic generation by two very dissimilar phases, the sporophyte being a simple branched tubular siphon and the subspherical to ovoid gametophyte generally referred to as the “Halicystis” phase (Kornmann 1938; Feldmann 1950; Ziegler and Kingsbury 1964; Page 1970; MacRaild and Womersley 1974; Mayhoub 1976; Kobara and Chihara 1981, 1984). However, some
* Ki Wan Nam [email protected] 1
Department of Marine Biology, Pukyong National University, Busan 48513, Korea
authors reported a lack of the gametophytic generation in Derbesia marina (Kornmann 1966, 1970; Sears and Wilce 1970). Pedobesia MacRaild et Womersley, which was established based on Derbesia clavaeformis from Australia, also shows this direct reproduction of the sporophytes (MacRaild and Womersley 1974; Silva et al. 1996).
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