Sea urchins of the genus Gracilechinus Fell & Pawson, from the Pacific Ocean: morphology and evolutionary history

Minin, K.V.; Petrov, N.B.; Vladychenskaya, I.P.

Авторы: Minin Kirill V., Petrov Nikolay B., Vladychenskaya Irina P.
Журнал: Marine Biology Research
Том: 11
Номер: 3
Год издания: 2015
Издательство: Taylor & Francis
Местоположение издательства: United Kingdom
Первая страница: 253
Последняя страница: 268
DOI: 10.1080/17451000.2014.928413
Аннотация: Gracilechinus is a widely distributed genus of regular echinoids with a center of species diversity in the North Atlantic (5 of 10 species). Only three species of this genus are known from the Pacific Ocean: Gracilechinus multidentatus, Gracilechinus euryporus and Gracilechinus lucidus. The first two species were previously assigned to the genus Echinus that differs from Gracilechinus in ambulacral tuberculation. According to our data, all three Pacific species possess ambulacral tuberculation characteristic of the genus Gracilechinus and differ from each other in the structure of valves of tridentate pedicellariae and primary spines. Assignment of these three species to the genus Gracilechinus is also confirmed by phylogenetic analysis of the 657 b.p. fragment of the COI gene. The COI tree provides evidence for the validity of the genera Gracilechinus and Echinus and agrees in general with morphological data. Among species of Gracilechinus, two lineages are distinguished on the COI tree differing in the shape of tridentate pedicellariae valves. One lineage comprises only the North Atlantic species Gracilechinus alexandri, another one includes the North Atlantic, South Atlantic and Pacific species. The genus Gracilechinus apparently has originated in the North Atlantic and only representatives of the second lineage penetrated the South Atlantic and the Pacific
Добавил в систему: Петров Николай Борисович

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Sea urchins of the genus Gracilechinus Fell & Pawson, from the Pacific Ocean: morphology and evolutionary historyстатья

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