Chthamalus malayensis   Pilsbry,  1916 (Barnacle)
Organism information awaits expert curation
Class: Maxillopoda

Image copyrights: Ocean Science and Technology Cell, CUSAT, Kochi

Size: Carino rostral diameter 10- 17 mm

Color: Varies from light brown to gray-brown with a greenish tinge due to algal impregnation.

External surface of adult shell conically depressed and almost rounded with varied shapes and sculptures. In young, distinctly ribbed with slightly projecting processes giving rise to secondary riblets round the circumferences; fully grown specimens eroded into and sutures between the parietes distinct. Tergum with 4-5 short depressor muscle crests.

Mouth parts- Labrum: Daniel (1955c) observed concave labrum but he did not mention about the presence of teeth. Karande and Palekar (1963a) observed about 15 teeth on the labrum. Fernando observed that the labrum is bullate and hairy with centrally depressed crest bearing 15-18 broad, triangular and slightly blunt teeth.

Mandible: Variations exist with regard to the number of spines below the fourth tooth of the mandible. NilssonĀ­ Cantell (1938a) observed the specimens collected from Gulf of Mannar (India). Daniel (1955c) observed 12 spines from Madras and Daniel and Chakrabarati (1967) observed only 6 spines in specimens from Pamban Bridge. From the Persian Gulf, Stubbings (1961) observed more than six spines. Karande and Palekar (1963a) observed 8-15 spines in the Bombay specimens. Fernando observed the number of spines agree with the specimens described from Bombay with the lower angle of the mandible produced into 3-5 strong and short spines.

Inner maxilla: The variations in the spines on cirrus II and below the fourth tooth of mandibles of the species from different localities seem to be constant for each place and hence Utinomi (1954) suggested that they could have a specific or racial significance.

Synonym (s)
Chthamalus moro Hiro, 1939b
Chthamalus malayensis Pilsbry, 1916
Chthamalus malayensis Broch, 1931
Chthamalus malayensis Nilsson-Cantell, 1938a
Chthamalus malayensis Hiro, 1939a
Chthamalus malayensis Utinomi, 1954
Chthamalus moro Pilsbry, 1916
Chthamalus moro Broch, 1931
Chthamalus moro Nilsson-Cantell, 1934
Chthamalus challengeri f. krakatauensis Broch, 1931
Chthamalus malayensis Pope, 1965

Common Name (s)
Economic Importance and Threats

Habitat:  Estuarine, Rocky, Coastal


• Tamil Nadu, Kanniyakumari INDIA
• West Bengal, Hugli INDIA
• Kerala, Trivandrum INDIA
• Maharashtra, Mumbai INDIA
• Tamil Nadu, Periyakuppam INDIA
• Tamil Nadu, Pamban INDIA
• Maharashtra, Madh Island INDIA
• Maharashtra, Bandra INDIA
• Andhra Pradesh, Rishikonda INDIA
• Tamil Nadu, Tharangambadi INDIA
• West Bengal, Digha INDIA
• Andaman and Nicobar Islands, Great Nicobar Island, Magar Nallah INDIA
• Maharashtra, Mumbai Harbour INDIA
• Tamil Nadu, Chennai INDIA
• West Bengal, Hugli Matla Estuary INDIA
• Tamil Nadu, Gulf of Mannar INDIA
• Andaman and Nicobar Islands, North Reef Island INDIA
• Andaman and Nicobar Islands INDIA
• West Bengal, South 24 Parganas INDIA
• West Bengal, Medinipur INDIA
• Andhra Pradesh, Visakhapatnam INDIA

Literature Source(s)
  • Fernando, SA (2006) Monograph on Indian Barnacles Ocean science and technology Cell, Kochi 9-199 Available at - NIO, Goa
  • Society for the Management of European Biodiversity Data (2009) World Register of Marine Species (WoRMS) Available at -
  • Marine Biological Station, Chennai, Tamil Nadu (2003) Checklist of marine fauna of Tamil Nadu Department of Environment, Government of Tamil Nadu Available at -
  • Daniel, A (1972) Marine intertidal barnacles in the Indian Ocean Proceedings of the Indian National Science Academy-Part B 38 (3-4) 179-182 Available at -
  • Rao, GC; Rao, DV and Devi, K (1994) A faunal exploration of the North Reef Island sanctuary, North Andaman Journal of the Andaman Science Association Andaman Science Association, Port Blair 10(1&2) 68-81 Available at - NIO, Goa
  • Rao, GC (1991) Distribution of plants and animals on the rocky sea shores of Andaman and Nicobar Islands Journal of the Andaman Science Association Andaman Science Association, Port Blair 7(2) 30-42 Available at - NIO, Goa
  • Roy, MK (2010) Diversity and Distribution of Crustacea Fauna in wetlands of West Bengal Journal of Environment and Sociobiology Social Environmental and Biological Association, Kolkata, India 7(2) 147-187 Available at - NIO,Goa
  • Pati, SK; Rao, MV and Balaji, M (2011) Fouling communities of the static substrate in a tropical harbour Journal of the Marine Biological Association of India The Marine Biological Association of India 53(1) 81-88 Available at - NIO,Goa

Page last updated on:2011-11-16

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