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This site is intended as an online repository for taxonomic and phylogenetic information on the Macrostomorpha, a basal group of free-living flatworms, with particular emphasis for the genus Macrostomum. According to current molecular phylogenies the Macrostomorpha are the most basal taxon of the Rhabditophora, which encompass all free-living flatworms (except for the Catenulida) and all the parasitic flatworms.
One problem with these (and many other) free-living flatworms, is that they are tiny and fragile creatures. They are often only 1mm long and one therefore cannot usually perform DNA sequence analyses and have a complete physical reference specimen at the same time (as entire worms, or at least substantial parts of worms, have to be used for DNA extraction).
Detailed photomicrographic documentation of the still living worms can serve as an excellent reference of a sequenced specimen. In contrast, the classically deposited reference specimens are serial sections on slides, which are informative for detailed anatomical studies, but which are neither suitable for genetic analyses, nor useful for species identification in the field. We therefore think that detailed photomicrographic documentation, appropriately organised, annotated and accessible through the web, will usually be much more informative for the general biologist who encounters these creatures.

La región Centroamericana constituye un puente entre grandes faunas de Norteamérica y Suramérica. Este sitio persigue la incorporación de participantes que estén interesados en constituir un sitio que recoja información básica sobre la fauna de Arácnidos que habita esta región. Queremos llegar a ser una herramienta de consulta eficiente e interactiva para el uso diverso de la información, queremos actualizar las listas de faunas locales, paginas de especies, mapas de distribución y herramientas de clasificación e identificación para conocer mejor lo que tenemos que cuidar y heredar a nuestras futuras generaciones. Haste miembro y participa como colaborador!!
El uso de la información en este sitio está limitado a "uso justo, no comercial". 
Citación: Víquez, C y Longhorn, S. (2016). Arácnidos de Centroamérica, en linea en, accedido en {fecha de acceso}.

The Central American region is a biodiversity bridge between North and South American arachnid faunas. This site seeks the inclusion of participants who are interested in forming a cyber place that collects basic information about the arachnids that inhabits this region. We want to become a reference tool for efficient and interactive use of diverse information, we want to update the lists of local faunas, species pages, distribution maps, plus identification and classification tools to better understand what we have to care for and pass to our future generations. Please come and join us by becoming a collaborator.
Use of information on this site is limited to non-commercial "fair use". 
Citation: Víquez, C and Longhorn, S. (2016). Arachnids of Central America, online at, accessed on {date of access}.

Learn about freeloader flies, which dare share the dinner of spiders, mantids and other predatory insects much larger than themselves.
Read a short introduction about the family Milichiidae (Diptera, Schizophora) or visit the species pages with information about and photos of common, beautiful and/or important species.