Search
Now showing items 1-10 of 17
A new giant species of placented worm and the mechanism by which onychophorans weave their nets (Onychophora: Peripatidae)
(Universidad de Costa Rica, 2010)
Onychophorans, or velvet worms, are poorly known and rare animals. Here we report the discovery of a new species that is also the largest onychophoran found so far, a 22cm long female from the Caribbean coastal forest of ...
An undescribed species of velvet worm from Chiapas, Mexico (Onychophora: Peripatidae)
(Universidad Estatal a Distancia (Costa Rica), 2018-06)
Onychophoran worms are considered “living fossils” because
their basic body structure has changed little in 500 million
years. Only two species have been properly recorded from Mexico:
Macroperipatus perrieri from ...
Immersion periods in four neotropical turtles
(Universidad Estatal a Distancia (Costa Rica), 2011)
Semi-aquatic turtles often dive to escape from terres-trial predators, but to our knowledge, the time that Costa Rican species can stay under water is unknown. To obtain preliminary measurements of this ecologically ...
Velvet Worms (Onychophora) in Folklore and Art: Geographic Pattern, Types of Cultural Reference and Public Perception
(Sciencedomain International (India), 2015-07-06)
Aims: To document and preserve folkloric beliefs and art inspired by velvet worms (Onychophora), rare invertebrates that are considered "living fossils", have full placental organs and capture prey with a rough "net" built ...
¿Qué sabemos realmente sobre el apareamiento de los onicóforos?
(Universidad de Costa Rica (Costa Rica), 2019)
Tras más de un siglo de estudio y a pesar de que hay más de 200 especies de onicóforos, solamente contamos con tres observaciones del apareamiento en sí. La inseminación se puede dar cuando el macho insemina vaginalmente ...
What do we really know about how velvet worms mate?
(Universidad de Costa Rica (Costa Rica), 2019)
After more than a century of studying a phylum that has over 200 species, we only have three reports of the mating itself. Insemination can occur vaginally or through the skin, and it is suspected that the male simply ...
¿Por qué los onicóforos requieren tanto tiempo de gestación como los camellos?
(Universidad de Costa Rica (Costa Rica), 2019)
Uno de los muchos misterios que rodean a los onicóforos, es porqué, siendo tan pequeños, tienen períodos de gestación tan largos como algunos mamíferos. Acá proponemos que esto se debe a su alimentación infrecuente y al ...
Dos maneras de ser un onicóforo
(Universidad de Costa Rica (Costa Rica), 2019)
Hay dos maneras de ser un onicóforo. Una es aparearse vaginalmente a corta edad, dar a luz en cualquier mes y tener machos pequeños y escasos. La otra es inseminar periódicamente por la pared corporal, con igualdad sexual ...
Why do onychophorans and camels need the same gestation time?
(Universidad de Costa Rica (Costa Rica), 2019)
One of the many mysteries surrounding onychophorans, is why, despite their small body size, they have gestation periods that are as long as gestation in some mammals. Here we propose that the causes are infrequent feeding ...
Two ways to be a velvet worm
(Universidad de Costa Rica (Costa Rica), 2019)
There are two ways to be a velvet worm. One is to mate vaginally at a young age, give birth in any month and have small, scarce males. The other is to periodically inseminate through the body wall, with sexual equality in ...