Dasya sylviae C.W.Schneider, M.M.Cassidy & G.W.Saunders 2021
Publication Details
Dasya sylviae C.W.Schneider, M.M.Cassidy & G.W.Saunders 2021: 28, fig. 2
Published in: Schneider, C.W., Cassidy, M.M. & Saunders, G.W. (2021). The pseudodichotomous Dasya sylviae sp. nov. (Delesseriaceae, Ceramiales) from 60-90 m mesophotic reefs off Bermuda. European Journal of Taxonomy 751: 24-37, 2 fig., 2 tables.
Request PDFType Species
The type species (holotype) of the genus Dasya is Dasya pedicellata (C.Agardh) C.Agardh.
Status of Name
This name is of an entity that is currently accepted taxonomically.
Type Information
Type locality: "Bermuda: Spittal: south of Cooper's I. off Castle Harbour (31 19.23333 N, 64 39.53333W)."; (Schneider & al. 2021: 32) Type: Schneider & Popolizio 16-21-14; 11 Aug. 2016; 63.8 m on rhodoliths; MICH; BDA2031 (fig. 2A) (Schneider & al. 2021: 32) Notes: GenBank nos: MW698721 (holotype), MW699769 (isotype); holotype: MICH [BDA2031]; isotypes: Bermuda
Natural History Museum, MICH, NY, UNB, US, Herb. CWS [BDA2030].
General Environment
This is a marine species.
Description
Plants epilithic, erect to 17 cm tall, carmine red, arising from small discoidal holdfasts; indeterminate axes sympodially branched, appearing pseudodichotomously branched throughout, only slightly tapering from base to apex, 0.3–0.8 mm diam. in median to lower portions and completely corticated by rhizoidal downgrowth; indeterminate axes densely covered throughout with determinate, lightly pigmented, monosiphonous dichotomously branched axes (pseudolaterals), except in some older plants in the most basal portions; pseudolaterals 1.7–5.5 mm in length, 25–91 cells from base to apex, irregularly dichotomously branched from the first to the seventh cell of the pseudolateral, upper portions unbranched and slightly tapering; basal cells of pseudolaterals initially globose to ellipsoid, 21–37 µm diam. and 12–30 µm long, then slightly elongating; suprabasal cells 19–32 µm diam. and 8–32 µm long, elongating more centrally, 9–22 um diam. and 27–102 µm long, and reaching greatest lengths distally, 8–19 µm diam. and 32–127 µm long; tetrasporangial stichidia single, borne terminally on 3–7-celled unbranched pseudolaterals or terminating basal dichotomies of pseudolaterals, lanceolate to narrowly elliptical in outline, 73–80 µm diam. and 269–305 µm in length at maturity, composed of 10–12 fertile segments, acropetally producing then releasing sporangia; sporangia globose, 21–29 µm diam., tetrahedrally divided, 3–5 per fertile segment, sporangia borne on 2-celled whorled branches, post-sporangial cover cells lacking; one to two spermatangial stichidia terminating a basal dichotomy on 4–10-celled pedicels (pseudolaterals), narrowly elliptical to lanceolate in outline, 46–69 µm diam. and 192–258 µm in length at maturity; carpogonial branches and cystocarps unknown.
Habitat
From 60–90 m mesophotic reefs off the coast of Bermuda.
Similar Species
Differing from most Dasya species by its pronounced pseudodichotomous branching pattern, and from its most similar congener in habit, D. crouaniana J.Agardh, by its longer pseudolaterals, narrower and shorter tetrasporangial stichidia and axes fully covered with pseudolaterals to barely denuded proximal axes.
Created: 14 June 2021 by Salvador Valenzuela Miranda.
Last updated: 19 August 2022
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=179576
Citing AlgaeBase
Cite this record as:
Craig Schneider in Guiry, M.D. & Guiry, G.M. 19 August 2022. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024
