Notochthamalus
genus of barnacles
Notochthamalus scabrosus, the only species in the genus Notochthamalus, is a species of barnacle found along the south-western and south-eastern coasts of South America, from Peru to the Falkland Islands. The species is found almost exclusively higher in the intertidal zone than the mussel Perumytilus, often codistributed with the confamilial barnacle Jehlius cirratus and Balanus flosculus.
Diagnosis and discussion
Notochthamalus is composed of 6 compartmental plates, composed of a carina, rostrum, and paired carinolatera and rostrolatera. Sutures between plates made up of poorly developed oblique folded laminae with membraneous basis. Plates are colored dull purplish brown, weathering to gray. Free-growing shellis are conic, crowded colonies become cylindrical, with plate sutures obscured. Opercular plates are narrow and deeply interlocked. The interior of the tergum shows a tergal depressor muscle pit with overhang and no crests, or only relics thereof. Neither shell nor opercular plates show secondary fusion with age. The best character for field identification are the undulations along the tergal-scutal margins.
“Notochthamalus” enters the record as genus of barnacles. Crown Archives preserves that source wording while asking what Notochthamalus, genus and barnacles can confirm, complicate or overturn.
Why this record matters
“Notochthamalus” is worth following because a concise public description often conceals a longer documentary argument. Here, Notochthamalus, genus and barnacles provides the most credible route into that argument.
The date and method of observation matter as much as the stated conclusion, especially where classification or consensus has changed. The source revision retrieved here is dated Jun 18, 2026. The linked authority identifier is Q7063139. None of the 0 selected statements returned an explicit reference.
A general summary may omit uncertainty, sample limits or methodological disagreement that is explicit in the technical record. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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Questions for further research
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This entry incorporates text from “Notochthamalus” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.