Revista Chilena de Historia Natural 76 (4): 665-680, 2003
RESEARCH ARTICLE
Morphological and histological development of the reproductive system of Pomacea
patula catemacensis (Baker 1922) (Mollusca, Caenogastropoda: Ampullariidae)
LAURA CARREÓN-PALAU, ESTHER URIA-GALICIA, FÉLIX ESPINOSA-CHÁVEZ & FERNANDO MARTÍNEZ-
The “apple snail” Pomacea patula catemacensis is an edible freshwater
mollusc, endemic to the Catemaco Lake in Veracruz, Mexico. During the past few years, the natural populations of this species have
been depleted mainly by uncontrolled fishery, and because of environmental degradation and pollution by pesticides and detergents. In
the present study, we carried out the histological and morphological characterization of the reproductive system of P. patula
catemacensis under laboratory conditions. We found that the reproductive development of this snail depended more on the size
than on the age the animals, and identified four development main stages, both for males and females. The main stages and their
mean lengths (± confidence interval at 95%) were (1) immature or not differenced (from 0.72 to 7 mm), (2) early maturation (from
18.95 ± 1.96 mm), (3) intermediate maturation (from 29.29 ± 4.9 mm), and (4) full maturity (from 35.89 ± 3.92 mm). This species is
oviparous, both sexes are separated, and fertilization is internal. Albumin and calcium carbonate secretion in females are performed
through the albumin gland, a trait that distinguishes this species from others, such as P. paludosa and P.
canaliculata. The stage of development can be identified by means of using anatomical traits, such as the albumin gland (in the
case of females), or the intromittent organ (in males).
apple snail, histology,
anatomy, reproduction, Catemaco lake
