Catolasmus

Catolasmus is one of two monotypic Catophragmid acorn barnacle genera recognized in the Northern Hemisphere. 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.

Catolasmus pilsbryi
Scientific classification
Kingdom:
Animalia
Phylum:
Arthropoda
Subphylum:
Crustacea
Class:
Hexanauplia
Infraclass:
Cirripedia
Order:
Sessilia
Suborder:
Balanomorpha
Superfamily:
Chthamaloidea
Family:
Catophragmidae
Subfamily:
Catophragminae
Genus:
Catolasmus

Ross & Newman, 2001[1]
Type species
C. pilsbryi (Broch, 1922)
Synonyms

Catophragmus pilsbryi Broch, 1922

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. Wall plates are solid, with no internal ribbing, as in Balanus. The basis is calcareous, thin, and does not form interdigitations with the wall plates.[1]:81

Soft parts are not specifically diagnostic, except the labrum has no denticles or bristles.

Nomenclature
  • Type species: Catophragmus pilsbryi Broch, 1922[2]:298
    • Fixation: Original designation by Ross and Newman, 2001[1]:81
  • Type locality: Isla Taboga, Panama, 8°47′N 79°33′W
  • Holotype:

Habitat and Geography

Catolasmus pilsbryi is a lower littoral species found on the Pacific Coast of Panama and Costa Rica.[3]:63 Ross & Newman, 2001,[1]:81 further stated a preference for vertical surfaces in the lower intertidal and subtidal habitats. Colonies are clumped or occur in patches, somewhat separated.

References
  1. Ross, A.; W. A. Newman (2001). "The Catophragmidae: members of the basal balanomorph radiation". Sessile Organisms. 18 (2): 77–91.
  2. Broch, H. (1922). "Studies on Pacific Cirripeds. Papers from Dr. Th, Mortensen's Pacific Expedition 1914-1916". Vidensk. Medd. Dansk. Naturh. Kobenhavn. 73: 213–358.
  3. Poltarukha, O. P. (2006). Identification Atlas of Superfamily Chthamaloidea (Cirripedia Thoracica) barnacles in World Ocean. Moscow: KMK Scientific Press, Ltd. pp. 198 [In Russian]. ISBN 5-87317-278-1.

Data related to Catolasmus at Wikispecies

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