EurekaMag
+ Translate
+ Most Popular
Investigations on the organic drift in North Swedish streams
Limitations of Using Microsoft Excel Version 2016 (MS Excel 2016) for Statistical Analysis for Medical Research
Phloem necrosis of coffee in Surinam
Anatomy of Mystus seenghala IV Nervous system
Integrated farming system for gardenland conditions of Coimbatore district - an over view
Tetrapleure (Tetrapleura tetraptera), an unknown African medicinal and spice plant
The origin and phylogenetic significance of the trochophoran larvae 2. evolutionary significance of the larvae of coelomate worms and mollusks
Comparison of rice bran and maize bran as feeds for growing and fattening pigs
Enterobacter amnigenus. An unusual human pathogen
Influence of Seriboost foliar application on leaf yield and leaf protein content in mulberry (Morus spp.), in relation to silkworm cocoon production
The identity of the lipstick mold of cultivated mushrooms agaricus bisporus
Advantages and disadvantages of bordeaux mixture and of lime-sulphur used on apples in the growing season
'Pan-sukh' disease of Rice in the Central Provinces
Geological age of the Ptilophyllum flora; a critical reassessment
Study of vitellogenesis in birds; physiological phases & role of folliculin in vitellogenesis
Evaluation of WCT coconut and Komadan coconut
Therapy for acne with saccharomyces boulardii
Evidence for Late Cretaceous N-S dextral shear in the west-central crystalline core, North Cascades, Washington
'Rajeshwari' - a high-yielding white seeded variety of sesame for Andhra Pradesh
Manufacture of Ricotta cheese from whey fortified with skim milk powder using different acidulants
Occurrence of Eutrichophilus mexicanus (Rudow, 1866) and Eutrichophilus lobatus (Ewing, 1936) (Phthiraptera: Trichodectidae) on Sphiggurus villosus (Cuvier, 1825) (Rodentia: Erethizontidae) in Rio de
Factors affecting fruitfulness in durian (Durio zibethinus Murr.). I. Flowering and pollination
Bronchial cuff pressure change caused by left-sided double-lumen endobronchial tube displacement
Some Biological Applications of Organometallic Compounds
The composition of pampas-grass (Cortaderia argentea.)

Convergent colonial organization and reproductive function in two bryozoan species epizoic on gastropod shells


Convergent colonial organization and reproductive function in two bryozoan species epizoic on gastropod shells



Journal of Natural History y; 35(7): 1085-1101



DOI: 10.1080/002229301300323929

Alcyonidium nodosum O'Donoghue and de Watteville occurs on whelks, Burnupena papyracea, off the south and western Cape, South Africa. A description is given of colony structure and organization in relation to reproductive and inferred feeding functions. The thick, encrusting colony is mammillate, each mammilla comprising a group of large male zooids bearing tall, funnel-shaped lophophores. Between mammillae are smaller female zooids bearing shorter, goblet-shaped lophophores. At the time of collection, October to November, colonies were actively reproducing, with the coelom of male zooids full of mature sperm. The lophophore of female zooids incorporated an intertentacular organ, while ovaries with developing oocytes and free ovulated eggs were both present. Eggs were twice observed being discharged through an intertentacular organ. Hippoporidra dictyota sp. n., from rocky reefs off Beaufort, North Carolina, is described. Its colonies encrust pagurid-inhabited shells and display the same colonial, and inferred functional, characteristics as those of A. nodosum. Male zooids on the mammillae bear reduced, non-feeding lophophores and are surrounded by autozooids, many bearing ovicells and presumed female, with normal lophophores. The feeding currents and flow patterns found in mammillate colonies, and their role in sperm discharge, are discussed. It is concluded that these two unrelated, shell-encrusting bryozoans have evolved identical hydrodynamic feeding systems which have been utilized to benefit reproduction. The mammillae provide foci for exhalant currents: the placement of male zooids therein concentrates all the sperm in a strong discharge, rising clear of the parent and enhancing its water-borne passage between colonies.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 003694648

Download citation: RISBibTeXText

Related references

On an epizoic gastropod, Saptadanta nasika Prashad & Rao, on the shells of Pterocera Lamarck. Journal of the Marine Biological Association of India 2: 124-127, 1960

On an epizoic gastropod, Saptadanta nasika Prashad and Rao, on the shells of Pterocera Lamarck. Jour Mar Biol Assoc India 2(1): 124-127, 1960

Penetrantia clionoides, sp. nov. (Bryozoa), a boring bryozoan in gastropod shells from Guam. The Biological Bulletin 174: 6-86, 1988

The morphology and colonial organization of the bryozoan genus. Paleontological Journal: 20-24, 1989

The epizoic diatom community on four bryozoan species from Helgoland (German Bight, North Sea). Helgoland Marine Research 57(1): 13-19, 2003

Characteristics of bryozoan colonial organization in the order Rhabdomesida. Paleontologicheskii Zhurnal 2: 48-58, 1985

Epizoic hydrozoan species on the shells of the nassariid gastropods from Sagami Bay, Japan. Memoirs of the National Science Museum (Tokyo) 3(7): 173-176, 2001

Survival and reproductive output in relation to substrate type in a bryozoan encrusting disarticulated bivalve shells. Hayward, P J, Ryland, J S, Taylor, P D Biology and palaeobiology of bryozoans 23-28, 1994

Descriptions of two new species of gastropod shells. Transactions and Proceedings of the New Zealand Institute 55: 153-154, 1924

Effects of ocean acidification on the shells of four Mediterranean gastropod species near a CO 2 seep. Marine Pollution Bulletin 124(2): 917-928, 2017

On the relevance of small gastropod shells to competing hermit crab species. Veliger 21(4): 488-489, 1979

Epizoic occurrence of a bryozoan electra crustulenta on the turtle chrysemys alabamensis. Transactions of the American Microscopical Society 94(1): 135-136, 1975

Sexual Reproductive Biology of a Colonial Rotifer Sinantherina socialis (Rotifera: Monogononta): Do mating strategies vary between colonial and solitary rotifer species?. Marine and Freshwater Behaviour and Physiology 46(6): 419-430, 2013

Are the preference and selection patterns of hermit crabs for gastropod shells species- or site-specific?. Journal of Experimental Marine Biology and Ecology 378(1-2): 15-21, 2009

Differential utilization of gastropod shells by three hermit crab species in North Inlet, South Carolina, U.S.A. Crustaceana Suppl (Leiden) (5): 101-104, 1979