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The identity of Eucheuma perplexum (Solieriaceae, Gigartinales) and its distinction from Eucheuma serra as exemplified by a proposed new epitype
Phycologia ( IF 1.6 ) Pub Date : 2020-08-19 , DOI: 10.1080/00318884.2020.1797375 Richard V. Dumilag, Showe-Mei Lin, Giuseppe C. Zuccarello, Gerald T. Kraft
Phycologia ( IF 1.6 ) Pub Date : 2020-08-19 , DOI: 10.1080/00318884.2020.1797375 Richard V. Dumilag, Showe-Mei Lin, Giuseppe C. Zuccarello, Gerald T. Kraft
ABSTRACT Eucheuma perplexum is based on specimens from Patotsu, Taiwan. This species is morphologically difficult to distinguish from other eucheumatoids that exhibit a broad range of habit forms, particularly Betaphycus gelatinus, Eucheuma denticulatum, and E. serra. Here, the Philippine and topotype specimens of E. perplexum have been examined, their distinguishing morphological features highlighted, and their phylogenetic relationships inferred from several gene sequences. Our results showed that E. perplexum is distinct from B. gelatinus and is a sister species to E. denticulatum and E. serra. Confusion also existed in a rather nebulous species circumscription of E. serra. We therefore conducted morphological and molecular taxonomic studies of conspecific specimens from Lord Howe Island, Australia. From the variety of forms there with identical DNA profiles, we propose to nominate an epitype that closely resembles Kylin’s illustration of the Mauritian holotype.
更新日期：2020-08-19
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