Dissection of Genus Nereis🧠 / Diseccion de Genero Nereis🧫🔬(En-Es)

Hello science addicts, I bring you a very interesting post because surely for the first time in the community we will see a dissection of a polychaete worm that belongs to the Nereididae family, they are characterized by being mostly marine, what is interesting about this species It is somewhat difficult to get it out of the beach sand with its capsule because they hide very quickly and extracting them from the capsule is also difficult without breaking them. Let's see some photographs of their anatomy and learn how their "organs" work.🧠🧫🔬

Hola adictos a la ciencia, les traigo un post bastante interesante porque seguramente por primera vez en la comunidad veremos una diseccion de un gusano poliqueto que pertenece a la familia Nereididae, son caractertizados por ser en su mayoria casi todos marinos, lo interesante de esta especie es que logre sacarlo de la arena de la playa con su capsula algo dificil porque se esconden muy rapido y extraerlos de la capsula tambien es complicado sin romperlos, vamos a ver algunas fotografias si su anatomia y aprender de como funcionan sus "organos"🐛🧪🌏

The genus Nereis🐛🔬/ El genero Nereis🧫🧠

These worms are fascinating and although they seem very simple in terms of anatomy and morphology, they are great survival machines and are quite resistant, many of them are almost all saltwater, and they can be found in different places on the beaches depending on the species and the food habitat this particular species seems to be a filter feeder but they range from herbivores to voracious predators! They are known to settle in a sac that they build themselves, they are difficult to identify and there is not much information on the internet about many species that today are a mystery! The post is more focused to see its anatomy.🧪🌏
Estos gusanos son fascinantes y aunque parecen muy simples en cuanto a anatomia y morfologia son grandes maquinas de supervivencia y son bastantes resistentes muchos de ellos son de agua salada casi todos, y se les pueden encontrar en diferentes lugares de las playas dependiendo la especie y el habitat alimenticio esta especie en particular parece filtradora pero los hay desde herbivoros hasta voraces depredadores! son conocidos por instalarse en un saco que ellos mismo construyen, son dificiles de identificar y no hay mucha informacion en internet sobre muchas especies que hoy en dia son un misterio! el post esta mas enfocado para ver su anatomia.🔬🧫


This particular species builds its capsule with clay and other marine materials, and inside it forms a layer which we are seeing in the microscope, which is like a kind of silk that allows it to insulate, hold on, and protect itself inside the capsules! The capsules are uncovered at low tide and are never 100% submerged! so we could say that they are "semi-aquatic".🧫🔬
Esta especie en particular construye su capsula con arcilla y otros materiales marinos ademas de dentro se constituye una capa la cual estamos viendo en el microscopio que es como especie de una seda que le permite aislarse, sujetarse y protegerse dentro de las capsulas! las capsulas quedan descubiertas en marea baja y nunca quedan 100% sumergidas! por lo que podriamos decir que son "semi-acuaticos".👨‍💻🧠


empty capsule🧠

These animals are characteristic because their body is full of setae and parapodia are used both for locomotion in the external environment and inside the capsule. In addition, these structures also carry out gas exchange since they do not have lung respiration because they are simple invertebrates! The setae that serve for transportation and movement are called "locomotor setae."👀

Estos animales son caracteristicos porque su cuerpo esta lleno de setas y parapodios son utilizados tanto para la locomocion en el medio externo como dentro de la capsula, ademas estas estructuras tambien realizan el intercambio gaseoso ya que no presentan respiracion pulmonar porque son invertebrados simples! las setas que sirven para el transporte y movimiento se denominan "setas locomotoras".👀🧠

They all have a cylindrical shape and although many species are adapted to burrow in the sand, others have adaptations that help them cling to substrates, this is called: (posidonia), and some species even frequently gather in large groups.🤷‍♂️👨‍💻🔬
Todos tienen forma cilindrica y aunque muchas especies estan adaptadas para excavar en la arena otras tienen adaptaciones que las ayuda a aferrarse a sustratos esto se denomina: (posidonia), e incluso algunas especies frecuentan reunirse en grandes grupos 🌏🧫🔬

Anatomy🐛🔬/ Anatomia🧫🧠

These animals can measure from 5 to 30 centimeters, the anterior lobe is known as "prostomium" then we have the peristomium which has four "tentacles" they are hosmiotic meaning the pressure of their cells is equal to the external pressure, here unlike Other worms are "dioecious" there are males or females, there is external fertilization with haploid cells! Its digestive tract is a simple tube that is distributed throughout the body, in the middle we get a "stomach", finally the rectum and the anus where the excretion of matter takes place. The circulation is open and has blood vessels, gas exchange is through "gills" and body wall.🧫🔬
Estos animales pueden medir de 5 hasta 30 centimetros, el lobulo anterior se le conoce como "prostomium" luego tenemos el peristomio el cual tiene cuatro "tentaculos" son hosmioticos osea la presion de sus celulas es igual a la presion externa, aqui a diferencia de otras lombrices estos son "dioicos" hay machos o hembras, existe una fecundacion externa con celulas haploides! su tracto digestivo es un tubo simple que se distribuye por todo el cuerpo, en la mitad conseguimos un "estomago", por ultimo el recto y el ano donde se realiza la excrecion de materia. La circulacion es abierta y presenta vasos sanguineos, el intercambio gaseoso es por "branquias" y pared corporal. 👨‍💻🧠



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Are these animalz everywhere in the world or they are limited to one regions


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