Multiple sex-chromosome system and other karyological characterizations of Pterotrachea hippocampus (Mollusca: Mesogastropoda)

6533b839fe1ef96bd12a6d89

RESEARCH PRODUCT

Multiple sex-chromosome system and other karyological characterizations of Pterotrachea hippocampus (Mollusca: Mesogastropoda)

A. Fucà E. Catalano D. Colombera A. L. Avila Roberto Vitturi

subject

Genetics Ecology biology Heterochromatin Zoology Chromosome Karyotype Spermatocyte Aquatic Science biology.organism_classification medicine.anatomical_structure Pterotrachea hippocampus medicine Ploidy Mesogastropoda Mollusca Ecology Evolution Behavior and Systematics

description

Two modal diploid numbers of chromosomes were found for Pterotraches hippocampus Philippi (Mollusca: Mesogastropoda) collected from the Gulf of Palermo in 1990: 2n=31 and 32 for males and females, respectively. This, along with other karyological characteristics such as the occurrence of a trivalent configuration at diakinesis and two types of metaphase-II spreads in spermatocytes, supports the notion that a X1X2Y♂/X1X1X2X2♀ sex mechanism operates in the species investigated here. Silver nitrate procedure revealed an intraindividual variation in the Ag-staining pattern occurring in this species. The majority of the chromosome pair displayed terminal and/or interstitial heterochromatic blocks after C-banding.

year	journal	country	edition	language
1993-04-01	Marine Biology

https://doi.org/10.1007/bf00349365

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