Digenea arenahauriens C.W.Schneider, Hamzeh & G.W.Saunders 2018

Digenea arenahauriens C.W.Schneider, Hamzeh & G.W.Saunders

Current name: Digenea arenahauriens C.W.Schneider, Hamzeh & G.W.Saunders
On intertidal rock, West Whale Bay, Southampton, Bermuda I., Bermuda - 01 April 2003. Craig Schneider

Publication Details
Digenea arenahauriens C.W.Schneider, Hamzeh & G.W.Saunders 2018: 93, figs 2-8

Published in: Schneider, C.W., Hamzeh, B.F., Lane, C.E. & Saunders, G.W. (2018). A new species of Digenea (Rhodomelaceae, Ceramiales) based upon a molecular assessment and morphological observations of plants historically known as D. simplex in Bermuda. Phytotaxa 338(1): 90-98, 8 figs, 1 table.

Publication date: 2018

Type Species
The type species (holotype) of the genus Digenea is Digenea simplex (Wulfen) C.Agardh.

Status of Name
This name is of an entity that is currently accepted taxonomically.

Type Information
Intertidal pools and rock locality: Capt. Williams’ Bay, south shore Bermuda I., 32°18' 08.2" N, 64°44' 18.1" W, Bermuda.; (Schneider & al. 2018: 95) Holotype: Thea R. Popolizio and Craig W. Schneider No. 12-171-1; 10 Dec. 2012; intertidal rock and tide pool; MICH; (Schneider & al. 2018: 95) Notes: Holotypus is illustrated as fig. 2.

Origin of Species Name
Participle (Latin), sand-drawing, drinking, sucking in (Schneider & al. 2018).

General Environment
This is a marine species.

Description
Plants rigid, cartilaginous, to 7.3 cm high, light to dark purplish- to reddish-brown arising from rhizoidal filaments coalesced into thick, pad-like holdfasts; erect indeterminate axes terete, dichotomously to irregularly branched, polysiphonous, axial rows surrounded by (8-) 9-12 pericentral cells (only seen below apices), heavily corticated and 0.9-4.1 mm diam. below the apices; indeterminate branches 0.7-3.1 mm diam.; indeterminate axes covered densely with thin, wiry determinate branches to 7.7 mm in length and 120-270 µm diam., lower axes often less densely covered, determinate branches deciduous, abraded or grazed, with regrowth of shorter determinate branches than the longer ones distally; determinate branches polysiphonous, with axial cells, 27-78 µm diam, surrounded by (8-) 9-12 pericentral cells, 14.4-38.4 (-44.0) µm diam., these in turn surrounded by 17-34 cylindrical outer cortical cells, 9.6-38.0 µm diam.; determinate branches composed of 44-60 axial segments 110-170 µm long in median portions, with lengths defined by the single axial cell of each segment; outer cortical cells of determinate branches angular, lenticular to irregular in surface view forming in discrete packets over pericentral cells; apices with short vegetative trichoblasts remaining during development; tetrahedral sporangia ellipsoidal to globose, 38-82 µm diam., swelling determinate branches subapically when forming, plants presumably dioecious, cystocarps urceolate (Fig. 8), 390-500 µm diam., formed laterally and subapically on determinate branches, one or more per branch; spermatangia unknown.

Habitat
Rocky intertidal and tidepools to -3 m.

Key Characteristics
Differing from the morphologically cryptic D. simplex by the production of a greater number of axial segments in determinate branches, and greater numbers of pericentral and cortical cells with larger diameters in these branches. It is easily distinguished from D. cymatophila by its upright habit, and the much smaller D. subarticulata by its size.

Created: 15 February 2018 by Craig Schneider.

Last updated: 23 March 2023

Verification of Data
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=167280

Citing AlgaeBase
Cite this record as:
G.M. Guiry in Guiry, M.D. & Guiry, G.M. 23 March 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 29 March 2024

 
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