Topic
Tectonatica
About: Tectonatica is a research topic. Over the lifetime, 2 publications have been published within this topic receiving 29 citations.
Papers
TL;DR: The occurence of members of the predatory caenogastropod family Naticidae in the littoral of the island of Giglio, Tuscany, Italy is investigated and molecular analysis allows consideration of naticid phylogeny.
Abstract: We investigated the occurence of members of the predatory caenogastropod family Naticidae in the littoral of the island of Giglio, Tuscany, Italy. We recorded a total of 8 species, all but one represented by both empty shells and living specimens. As most studies of Mediterranean naticids are based solely on empty shells, we here provide images of living animals for 7 out of the 8 species encountered; for several of these species this is the first photographic documentation of the animal. Our survey included a systematic collection of egg masses (”sand collars”) which were hatched in the laboratory. The larvae obtained as well as the sand collars themselves were used for molecular analysis of the species based on gene fragments of mitochondrial cytochrome oxidase subunit I (COI), histone 3 (H3), the mitochondrial 16S rRNA (16S), and 18S rRNA (18S). We show that such molecular analysis allows the confirmation of the identity of naticid species without having access to adult specimens or shells. This approach identified one additional naticid species for which no adult specimens or shells were found. Additionally, our molecular analysis allows consideration of naticid phylogeny.
33 citations
TL;DR: This study demonstrates that the morphological characters of the teleoconch are of low significance in species recognition, and should the characters be ranked, the operculum comes first and is the primary element, sufficient to distinguish each species.
Abstract: The present paper is the second in a series devoted to the revision of the Pliocene naticids of Northern and Central Italy. It concludes the section covering the calcareous operculum-bearing Naticinae and expands to 18 the total number of species and subspecies of this subfamily recovered so far from the Pliocene deposits of Italy. Of the six taxa considered in this study, two ( epigloafuniculata and fredianii ) fully match the characters of the genus Cochlis Roding, 1798, one ( koeneni ) is assigned to the genus Tanea Marwick, 1931, the rest ( astensis , prietoi and tectula ) belong to the genus Tectonatica Sacco, 1890. All the six taxa considered in this paper are described and commented in the systematic account. One, Cochlis fredianii , is proposed as new. In the chapter treating the generic assignment of the studied taxa, the range of Tanea , hitherto used to allocate several Indo-Pacific species, is extended to the Mediterranean Basin as well, and the relations between Tectonatica and Cryptonatica Dall, 1892 are discussed. This study further demonstrates that the morphological characters of the teleoconch are of low significance in species recognition. In fact, should the characters be ranked, the operculum comes first and is the primary element, sufficient to distinguish each species. The protoconch and the color pattern are the second and third relevant attributes that can be used diagnostically for several taxa, but not always. The other shell features appear to be useful tools in separating species only occasionally. Some species lack distinctive shell characters and do require operculate specimens in order to be confidently
3 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2008 | 2 |