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Azolla coloniensis

Polypodiopsida - Salviniales - Salviniaceae

Taxonomy
Azolla coloniensis was named by De Benedetti et al. (2018). It is considered to be a form taxon. Its type specimen is MPEF-PA 80, a multi organs (Megaspore), and it is a compression fossil. Its type locality is Cañadón del Irupé, which is in a Maastrichtian/Paleocene marginal marine siliciclastic/siliciclastic in the La Colonia Formation of Argentina.

Synonymy list
YearName and author
2018Azolla coloniensis De Benedetti et al. figs. 3A-3H
2019Azolla coloniensis Hermsen et al.
2021Azolla coloniensis De Benedetti et al.
2023Azolla coloniensis De Benedetti et al. p. 6
2024Azolla coloniensis De Benedetti et al.

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RankNameAuthor
kingdomPlantae
phylumPteridophyta
classPolypodiopsida
subclassPolypodiidae()
RankNameAuthor
orderSalvinialesLink 1833
familySalviniaceaeLestiboudois
genusAzollaLamarck 1783
speciescoloniensis

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Azolla coloniensis De Benedetti et al. 2018
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Diagnosis
ReferenceDiagnosis
F. De Benedetti et al. 2018Megaspore apparatus is ovoid, c. 360 (400) 520 mm long and c. 260 (270) 360 mm wide, partially covered by a thick mat of intertwined hairs. Megaspore trilete, spherical to sub-spherical, c. 250-320 mm in diameter. Megaspore wall is formed by exine and a much thicker two-layered perine. In LM, exine and endoperine appear homogeneous, whereas exoperine is columellate and has a reticulate surface. In thin section under TEM, exine is relatively homogeneous with dispersed small irregular cavities; endoperine is of granular appearance and spongy structure; exoperine consists of contorted nodular or clavate to tabular partially fused masses. Under SEM, exoperine surface consists of muri linked to form a reticulum with rounded lumina. Hairs emerge from the exoperine surface and cover completely the megaspore forming the infrafilosum. Float system is thimble shaped, occupying at least the upper twofifths of the megaspore apparatus. Floats spongy pseudovacuolate, 18-21 or more, arranged in three (exceptionally four) tiers. Lower level with 9-12 small spherical, elliptical, or rhomboidal floats that extend over the proximal surface of the megaspore. Middle level with 6 or more larger floats, rhombic-shaped or irregular, often with a large invagination. Upper level with three large rhombic floats with deep invaginations. Modified perine forms a proximal
dome-shaped columella. Hairs arise from the reticulate surface of the floats and from the columella. Microspore massulae are irregular, elliptical or triangular in shape, with a granular appearance and spongy vacuolated structure. Microspores trilete, psilate, c. 14-30 mm in equatorial diameter. Surface of the microspore massulae with numerous aseptate glochidia of up to 35 mm long, with a stalk of uniform width and distally broadening and then constricted below an anchor-shaped tip. Flukes narrow gradually and with recurved hooks.
Measurements
No measurements are available
No ecological data are available

Age range: base of the Maastrichtian to the top of the Early/Lower Paleocene or 72.20000 to 61.66000 Ma

Collections (6 total)


Time interval Ma Country or state Original ID and collection number
Maastrichtian72.2 - 66.0Argentina (Chubut) Azolla coloniensis (199410 239890 239891)
Late/Upper Maastrichtian - Danian72.2 - 61.66Argentina (Chubut) Paleoazolla patagonica (195706)
Maastrichtian - Early/Lower Paleocene72.2 - 61.66Argentina (Chubut) Azolla coloniensis, Azolla type, Paleoazolla patagonica (type locality: 195707)
Danian66.0 - 61.66Argentina (Chubut) Azolla coloniensis (239892)