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PubMedDate not supplied

[Tissue hemoglobins in Bivalvia (Mollusca)].

Distribution and properties of tissue hemoglobins in bivalves are reviewed. The mollusk gills are given particular attention; their functions, relative weight and area of gill surface, as well as the content, properties, and functional importance of gill hemoglobin are analyzed.

Animals↗
PubMedDate not supplied

[Effect of trematoda infection and different concentrations of surface active agents onto physical and chemical characteristics of haemolymph of Planorbarius corneus (Mollusca: Pulmonata)].

Effect of trematod infection and different concentrations of detergent (20, 50, 80 mg/dm3) onto physical and chemical characteristics of haemolymph of Planorbarius corneus (content of Hb, density, active reaction, amount of Hb per unit of total mass and soft mass of the body) have been investigated. It was noted that all changes of named characteristics caused by detergent were more pronounced in infected mollusks.

Animals↗
PubMed2001

[Abundance and morphometry of tuberculosa Anadara and A. similis (Mollusca: Bivalvia) in the Manglar de Purruja, Dulce Gulf, Costa Rica].

The density, population, length, yield and sex proportion of the mollusks Anadara tuberculosa and A. similis were studied in Bahía de Golfito, Golfo Dulce, Pacific coast of Costa Rica from February 1998 to February 1999. A. tuberculosa was more abundant (0.9 units m(-2)), than A. similis (0.2 units m(-2)); the highest abundance was found at the canal mouths. The average lengths were 43.3 mm for A. tuberculosa and 42.8 mm for A. similis (both under the Costa Rican legal minimal length for exploitation: 47 mm). Maximum lengths were measured in the middle and upstream Canal Mayor, respectively: 43.0 mm and 43.4 mm. The correlation between length and fresh weight was 0.81 (Pearson). The average total weights were 26.2 g for A. tuberculosa and 19.1 g for A. similis. The condition index (a meat yield measurement) was higher in A. similis (21.2%) than in A. tuberculosa (17.2%). The maximum yield for both species lies in the 31-35 mm range. The male ratio was 43.7%. A species recovery plan is urgent because these results suggest both a decrease in density and illegal exploitation.

Animals↗
PubMed2000

[Reproductive cycle and index of condition used for Melongena corona (Mollusca: Gastropoda)].

Melongena corona bispinosa was studied in Yucatán, México (21 degrees 16' N, 89 degrees 49' W) for a year. Males have reproductive peaks in February and December, and a post-copulation peak in June. Female peaks are in March and May, plus oviposition peaks in April and January. Males and females differ in the mean gonadosom ic index (F=13.79, p<0.05) but not in the dry tissue/shell weight (F=0.0902, p<0.05), dry tissue and total weight (F=0.2466, p<0.05) and dry tissue weight/internal shell volume (F=1.0565, p<0.05).

Animals↗
PubMed2005

Phylogenetic relationships among six vetigastropod subgroups (Mollusca, Gastropoda) based on 18S rDNA sequences.

Complete 18S rDNA sequences were determined for 10 vetigastropods in order to investigate the phylogeny of Vetigastropoda, which is controversial. These sequences were analyzed together with published sequences for nine other vetigastropods and two nerites. With the two nerites as outgroups, the phylogeny was inferred by three analytical methods, neighbor-joining, maximum likelihood, and maximum parsimony. The 18S rDNA sequence data support the monophyly of four vetigastropod superfamilies, the Pleurotomarioidea, the Fissurelloidea, the Haliotoidea, and the Trochoidea. The present results yield the new branching order: (Pleurotomarioidea (Fissurelloidea ((Scissurelloidea, Lepetodriloidea) (Haliotoidea, Trochoidea)))) within the vetigastropod clade.

Animals↗
PubMed1991

A technique for cardiac denervation in Megalobulimus sanctipauli (Mollusca, Gastropoda, Pulmonata).

Cardiac nerve of Megalobulimus sanctipauli can be accessed by making an incision of about 1 cm with the aid of a scalpel introduced into the connective tissue (whitish scar) joining a fold of the anterior lobe of the digestive gland. The existence of an externally identifiable anatomic characteristic (whitish scar) facilities access to the nerve thus preventing large hemolymph loss. The percentage of hits of the technique was evaluated in two different groups (N = 14 and 17) of animals, with positive results obtained for 86% and 88%, respectively. The survival rate determined 13 days after surgery for one experimental group (N = 14) was 71%.

Animals↗
PubMed1990

[Location of immunoreactive leucine enkephalin in the digestive gland of the Mollusca Mizuhopecten yessoensis (Jay)].

Distribution of leu-enkephalin-like peptides in the digestive gland of the Japanese scallop has been investigated by means of the indirect immunohistochemical method. The immunoreactive leu-enkephalin is revealed in supranuclear vacuoles of separate large secretory cells. These cells are situated in epithelium of the digestive tubules along the gland periphery. Their number is from 1-3 up to 5-6 per tubue section. The basal part of the cell and small apical vacuoles do not contain any products of the reaction. It is possible that in the bivalve molluscs, as in vertebrates, the leu-enkephalin-immunoreactive elements participate in regulation of digestion.

Animals↗