Plagiodontes dealdaleus (Deshayes, 1851) is a variable species occurring in Argentina. Up till now, several subspecies have been recognized. A new study by Piz?? and Cazzaniga (2010) now shows that the nominate subspecies and P. d. strobeli (D??ring, 1877) are in fact two allopatric species.
Harry Lee has just released two contributions on the excellent website of Bill Frank and himself (www.jaxshells.org) about the correct attribution of taxonomic names. What seems like a dispute about futilities is actually a good piece of detective work.
Photo: Harry Lee
Photo: Harry Lee
In a paper published last week, four new taxa were described from Peru belonging to the Orthalicidae (Breure & Mogollón, 2010).
The iPhylo blog had a few days ago a post about the relevance of taxonomic names (http://iphylo.blogspot.com/2010/10/are-names-really-key-to-big-new-biology.html). Do we need names? According to this blogpost, “formal taxonomic names don’t seem terribly necessary in order to do a lot of science“. This opinion was underpinned by referring to surrogate names (like ‘SAR-11’), which are commonly used in experimental studies. In many cases this may be appropriate, but if you have read my blogpost of yesterday, I would like to say: “think it over, it’s not that simple”.
There are a few wrinkles to deal with. Firstly, names may have synonyms, lexical variants, etc. (….). Leaving aside lexical variants, what we want is a “view” of the [name,document] pairs that says this subset refer to the same thing (the “taxon concept”).We can obsess with details in individual cases, but at web-scale there are only two ones that spring to mind. The first is the Catalogue of Life, the second is NCBI. The Catalogue of Life lists sets of names and reference that it regards as being the same thing, although it does unspeakable things to many of the references. In the case of NCBI the “concepts” would be the sets of DNA sequences and associated publications linked to the same taxonomy id. Whatever you think of the NCBI taxonomy, it is at least computable, in the sense that you could take a taxon and generate a list of publications ‘about” that taxon.
Sometimes Neotropical land snails are used for fundamental research. Moraes et al. (2010) investigated the ultrastructure of snail brains in Megalobulimus abbreviatus (Bequaert, 1948), viz. the dorsal body; this is an endocrine gland located above the cerebral ganglia in all pulmonate molluscs.
Doing quite some DNA analyses lately, I become aware that modern biologists may get drowned by the superfluous amount of tools available. Unless they stick to protocols by peers or literature. And those who are bit on the conservative side, still stick with PAUP of course.
Just as a diversion…
In the latest issue of Revista de Biolog??a Tropical, an important paper was published about the malaco-biodiversity of two areas in northern Argentina. Both areas are in Prov. Tucum??n and cover two contrasting biotopes: the humid Yungas and the xerophytic Chaque??a.
Today some pictures of Porphyrobaphe irrorata (Reeve, 1849) that were sent to me several weeks ago by Adri??n Gonz??lez.
Pedro Romero sent me a link to a recent paper on Neotropical snail morphology, of which he one of the co-authors.