Gracilariopsiseae Gurgel, J.N. Norris et Fredericq, 2018

Gurgel, Carlos Frederico D., Norris, James N., Schmidt, William E., Le, Hau Nhu & Fredericq, Suzanne, 2018, Systematics of the Gracilariales (Rhodophyta) including new subfamilies, tribes, subgenera, and two new genera, Agarophyton gen. nov. and Crassa gen. nov., Phytotaxa 374 (1), pp. 1-23 : 12

Gracilarioideae tribe Gracilariopsiseae Gurgel, J.N. Norris et Fredericq tribus nov. Gracilariopsis E.Y. Dawson 1949: 40 .

TYPE SPECIES: Gracilariopsis sjoestedtii (Kylin) E.Y. Dawson 1949: 43 .

BASIONYM: Gracilaria sjoestedii Kylin 1930: 55 ; which is now Gracilariopsis andersonii (Grunow) E.Y. Dawson 1949: 43 , basionym:

Cordylecladia andersonii Grunow (in Piccone 1886: 62).

DIAGNOSIS: Superficial spermatangia; cystocarps without tubular nutritive gonimoblast cells connecting gonimoblast mass to the pericarp; lower gonimoblast cells linking to base of cystocarp through secondary pit connections; gonimoblast mass composed of small cells with very thin cell walls.

GENUS IN TRIBE GRACILARIOPSISEAE : Gracilariopsis (includes Gracilariophila , in part)

REMARKS: Our Bayesian results together with published molecular evidence were all congruent in recognizing the genus Gracilariopsis as a monophyletic clade with maximum support ( Figs. 1 , 2 ). The placement of Gracilariophila in this tribe is based on shared morphological characters and similarities of reproductive structures characteristic Gracilariopsis (Fredericq et al. 1989) . We recognize that Gracilariophila is congeneric with Gracilariopsis , and for now proposed its inclusion in that genus recognizing that further molecular data are needed to test their relationship and taxonomic status.

PERTINENT SPECIES IN GRACILARIOIDEAE TRIBE GRACILARIOPSISEAE : Gracilariopsis andersonii (Grunow) E.Y. Dawson ; Gp. animasensis Gurgel et J.N. Norris ; Gp. carolinensis Liao et Hommersand ; G p. cata-luziana Gurgel, Fredericq et J.N. Norris ; Gp. chiangii S.M. Lin ; Gp. costaricensis E.Y. Dawson ; Gp. heteroclada J.-F. Zhang et B.-M. Xia; Gp. hommersandii Gurgel, Fredericq et J.N. Norris ; Gp. lemaneiformis (Bory de Saint- Vincent) E.Y. Dawson, Acleto et Foldvik; Gp. longissima (S.G. Gmelin) Steentoft, L.M. Irvine et Farnham ; Gp. mclachalii Buriyo, Bellorin et M.C. Oliveira ; Gp. nhatrangensis Nhu Hau et S.-M. Lin; Gp. panamensis (W.R. Taylor) E.Y. Dawson ; Gp. persica Bellorin, Sohrabipour et E.C. Oliveria ; Gp. silvana Gurgel, Fredericq et J.N. Norris ; Gp. sjoestedtii (Kylin) E.Y. Dawson ; Gp. tenuifrons (C.J. Bird et E.C. Oliveira) Fredericq et Hommersand

Figures

FIGURE 1. One of 18,002 ML trees of the marine red algal order Gracilariales derived from a Bayesian phylogenetic analysis (after burnin removal). Molecular data used: rbcL DNA sequence alignment composed of 68 taxa and 1,459 bp. New taxonomic proposal for the order is presented. Numbers above branches correspond to Bayesian posterior probabilities (PP); * = 1.0 PP.

FIGURE 2. One of 18,000 ML trees of the marine red algal order Gracilariales derived from a Bayesian phylogenetic analysis (after burnin removal). RbcL sequence alignment composed of 36 taxa and 1,467 bp focusing on the relationhsips inside the large genus-complex Gracilaria sensu lato. New taxonomic proposal for the genera within Gracilaria sensu lato is presented. Numbers above branches correspond to Bayesian posterior probabilities (PP); * = 1.0 PP.