Conchoderma virgatum

Conchoderma virgatum is a species of goose barnacle in the family Lepadidae. It is a pelagic species found in open water in most of the world's oceans attached to drifting objects or marine organisms.

Conchoderma virgatum
Illustration of Conchoderma virgatum
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Maxillopoda
Order: Lepadiformes
Family: Lepadidae
Genus: Conchoderma
Species:
C. virgatum
Binomial name
Conchoderma virgatum
Synonyms[1]
  • Conchoderma hunteri (Owen, 1830)
  • Conchoderma virgata (Spengler, 1790)
  • Lepas virgata Spengler, 1790

Description

Conchoderma virgatum has a flexible, flattened, scale-less peduncle (stalk) which is attached to a solid surface, and a capitulum (body) with five smooth, four-sided plates, widely separated from each other and not clearly demarcated from the peduncle. The total length of this goose barnacle is about 70 mm (2.8 in), half of which is the peduncle. Overall, the colour is grey, but there are some dark purplish-brown longitudinal streaks.[2]

Distribution

Conchoderma virgatum has a cosmopolitan distribution, being found in all the world's oceans attached to a wide range of drifting and swimming objects,[3] as well as benthic habitats.[4]

Ecology

Conchoderma virgatum is found attached to a wider range of floating objects and nekton than goose barnacles in the genus Lepas. This species seems to have evolved from the same common ancestry as Conchoderma auritum, which occurs on whales, and Alepas which occur on jellyfish.[3] Most attachments are to inanimate objects such as buoys and the hulls of ships, but it has been recorded as being attached to seaweed, crabs, sea snakes, turtles and whales, and at least thirteen species of fish.[4] Direct attachment to fish is infrequent, perhaps because of the mucus produced by the skin; in one example, four of the barnacles were attached to a single spine of a spot-fin porcupinefish (Diodon hystrix).[5] This barnacle also attaches to several species of parasitic copepods, and on one occasion was observed attached to an isopod that was parasitic on an orange filefish (Aluterus schoepfii).[4]

Like most barnacles, Conchoderma virgatum is a filter feeder. A number of modified legs known as "cirri" can be extended into the water column. These feathery appendages beat rhythmically and catch plankton and small organic particles, drawing them into the mouth.[6]

References
  1. Chan, Benny K.K. (2018). "Conchoderma virgatum Spengler, 1789". WoRMS. World Register of Marine Species. Retrieved 6 August 2018.
  2. van Couwelaar, M. "Conchoderma virgatum". Zooplankton and Micronekton of the North Sea. Marine Species Identification Portal. Retrieved 6 August 2018.
  3. Newman, William A.; Ross, Arnold (1971). Antarctic Cirripedia: Monographic Account Based on Specimens Collected Chiefly Under the United States Antarctic Research Program, 1962–1965. American Geophysical Union. pp. 35–36. ISBN 978-0-87590-114-5.
  4. Hastings, Robert W. (1972). "The barnacle, Conchoderma virgatum (Spengler), in association with the isopod, Nerocila acuminata Schioedte & Meinert, and the orange filefish, Alutera schoepfi (Walbaum)". Crustaceana. 22 (3): 274–278. doi:10.1163/156854072X00552. JSTOR 20101889.
  5. Balakrishnan, K.P. (1969). "Observations on the occurrence of Conchoderma virgatum (Spengler) (Cirripedia) on Diodon hystrix Linnaeus (Pisces)". Crustaceana. 16 (1): 101–103. doi:10.1163/156854068X00269. JSTOR 20103036.
  6. Ruppert, Edward E.; Fox, Richard, S.; Barnes, Robert D. (2004). Invertebrate Zoology (7th ed.). Cengage Learning. pp. 678–680. ISBN 978-81-315-0104-7.
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