Trichomycterus dali - новый вид ванделлиевых сомов (Trichomycteridae) из Бразилии

Ответить
Yan
Клуб
Клуб
Сообщения: 6652
Зарегистрирован: Пн ноя 14, 2005 10:26 pm
Откуда: Бат Ям
Благодарил (а): 7 раз
Поблагодарили: 15 раз
Контактная информация:

Trichomycterus dali - новый вид ванделлиевых сомов (Trichomycteridae) из Бразилии

Сообщение Yan » Вс сен 18, 2011 4:20 pm

Trichomycterus dali
Rizzato, Costa, Trajano & Bichuette, 2011
Trichomycterus dali, new species, is described from flooded limestone caves in Serra da Bodoquena karst area, State of Mato Grosso do Sul, Central Brazil. The new species is diagnosed by a unique character in the genus, the presence of conspicuous, ridge-like adipose folds lining dorsally throughout the body. Trichomycterus dali can be further distinguished readily from epigean congeners by the reduction of eyes and skin pigmentation (except for T. gorgona), and from remaining congeners (i.e., all hypogean plus T. gorgona) by the total loss of eyes, not visible externally (except for T. sandovali and T. spelaeus). Other diagnostic features includes very long barbels, especially the nasal (99.3-143.5% HL) and the maxillary (97.0-131.3% HL), pectoral-fin ray count reaching I,9 and a unique cranial fontanel with a conspicuous constriction on the meeting point of supraoccipital and the two frontal bones. The troglobitic status of the species is suggested by the presence of troglomorphisms on an advanced degree, especially the reduction of skin pigmentation, the total loss of eyes and the enlarged barbels. In addition, the presence of a well developed adipose fold in adults may indicate a distinctive adaptation acquired by neoteny to
withstand the food scarce conditions of its hypogean habitat.
Trichomycterus dali: a new highly troglomorphic catfish (Silurifomes: Trichomycteridae) from Serra da Bodoquena, Mato Grosso do Sul State, Central Brazil
Pedro Pereira Rizzato, Edmundo P. D. Costa-Jr., Eleonora Trajano and
Maria Elina Bichuette
Neotropical Ichthyology, 9(3): 477-491, 2011
Ян

Ответить