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Stephanollona ricoae

Gymnolaemata - Cheilostomata - Phidoloporidae

Discussion

LSID urn:lsid:zoobank.org:act:D56CE466-9500-487C-A5F4-2C936F553440 Derivation of name. The species is dedicated to Alicia Etel Rico, in recognition of her studies on the benthic fauna of Comodoro Rivadavia harbour, and for her years of teaching at Universidad Nacional de la Patagonia San Juan Bosco.

Taxonomy
Stephanollona ricoae was named by Iturra et al. (2025). Its type specimen is MPEF-PI 7192, a shell (one colony on a shell), and it is a 3D body fossil. Its type locality is Cerro Antena, near Comodoro Ricadavia, which is in a Burdigalian/Langhian shallow subtidal sandstone in the Chenque Formation of Argentina.

Synonymy list
YearName and author
2025Stephanollona ricoae Iturra et al.

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
—Lophophorata
phylumBryozoaEhrenberg 1831
RankNameAuthor
classGymnolaemataAllman 1856
orderCheilostomataBusk 1859
suborderNeocheilostominad'Hondt 1985
superfamilyCelleporoideaJohnston 1838
familyPhidoloporidaeGabb and Horn 1862
genusStephanollonaDuvergier 1921
speciesricoae

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.

†Stephanollona ricoae Iturra et al. 2025
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Diagnosis
ReferenceDiagnosis
D. Iturra et al. 2025 Colony encrusting, autozooids with cleithridiate orifice and a U-shaped sinus in the proximal margin. Six articulated oral spines around the orifice, of which only the bases persist. Avicularian dimorphism absent. Avicularia adventitious, paired or single, oval, lateral to the orifice; rostrum smooth, crossbar complete, with a short ligula. Ovicell globular to subimmersed, imperforate, aperture with a well-developed labellum flanked by indentations
Measurements
No measurements are available
Composition: intermediate Mg calcitef
Environment: marineuc
Locomotion: stationaryo
Attached: yeso
Life habit: epifaunalo
Diet: suspension feedero
Vision: blindc
Reproduction: oviparouso
Brooding: yeso
Created: 2008-02-26 05:52:04
Modified: 2008-02-27 08:35:35
Source: f = family, o = order, c = class, uc = unranked clade
References: Nesnidal et al. 2013, Smith et al. 2006

Age range: base of the Burdigalian to the top of the Langhian or 20.45000 to 13.82000 Ma

Collections: one only


Time interval Ma Country or state Original ID and collection number
Burdigalian - Langhian20.45 - 13.82Argentina (Chubut) Stephanollona ricoae (type locality: 241015)