''Catolasmus'' is one of two
monotypic
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispec ...
Catophragmid
acorn barnacle
Acorn barnacle and acorn shell are Common name, vernacular names for certain types of stalkless barnacles, generally excluding goose barnacles, stalked or gooseneck barnacles. As adults they are typically cone-shaped, symmetrical, and attached to r ...
genera
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...
recognized in the
Northern Hemisphere
The Northern Hemisphere is the half of Earth that is north of the Equator. For other planets in the Solar System, north is defined as being in the same celestial hemisphere relative to the invariable plane of the solar system as Earth's Nort ...
. It is easily identified by its prominent whorls of
imbricating plates surrounding the main wall plates. It is quite large, attaining 55 mm diameter. ''Catolasmus'' represents one of the
relictual lineages of the basal balanomorph radiation.
Diagnosis and Discussion
The most obvious diagnostic feature in the field for ''Catolasmus'' is the accessory imbricating plates, which are numerous (up to ten whorls, and prominent, nearly covering the primary wall plates. Individual whorl plates are strongly symmetrically ribbed. There are eight primary wall plates, with the
rostrolatus entering the sheath, and free from the adjacent
rostrum
Rostrum may refer to:
* Any kind of a platform for a speaker:
**dais
**pulpit
* Rostrum (anatomy), a beak, or anatomical structure resembling a beak, as in the mouthparts of many sucking insects
* Rostrum (ship), a form of bow on naval ships
* Ros ...
. Wall plates are solid, with no internal ribbing, as in ''
Balanus
''Balanus'' is a genus of barnacles in the family Balanidae of the subphylum Crustacea.
This genus is known in the fossil record from the Jurassic to the Quaternary periods (age range: from 189.6 to 0.0 million years ago.). Fossil shells withi ...
''. The basis is calcareous, thin, and does not form interdigitations with the wall plates.
[
Soft parts are not specifically diagnostic, except the labrum has no denticles or bristles.
]
Nomenclature
* Type species: ''Catophragmus pilsbryi'' Broch, 1922[
* Type locality: Isla Taboga, Panama,
* Holotype:
]
Habitat and Geography
''Catolasmus pilsbryi'' is a lower littoral species found on the Pacific Coast
Pacific coast may be used to reference any coastline that borders the Pacific Ocean.
Geography Americas
Countries on the western side of the Americas have a Pacific coast as their western or southwestern border, except for Panama, where the Pac ...
of Panama
Panama ( , ; es, link=no, Panamá ), officially the Republic of Panama ( es, República de Panamá), is a transcontinental country spanning the southern part of North America and the northern part of South America. It is bordered by Cos ...
and Costa Rica
Costa Rica (, ; ; literally "Rich Coast"), officially the Republic of Costa Rica ( es, República de Costa Rica), is a country in the Central American region of North America, bordered by Nicaragua to the north, the Caribbean Sea to the no ...
.[ further stated a preference for vertical surfaces in the lower intertidal and subtidal habitats. Colonies are clumped or occur in patches, somewhat separated.
]
References
External links
{{Taxonbar, from=Q16975537
Barnacles