2005-03-17

    Los gusanos espirales ya no son tan especiales

    Los animales con simetría bilateral se dividen en 2 grupos, protóstomos y deuteróstomos, dependiendo del destino del blastoporo (boca o ano, respectivamente). Los vertebrados, esos animales que comparten con nosotros el tener columna vertebral (y otras muchísimas cosas, pero sólo menciono el origen del nombre del grupo), forman parte del filo de los cordados. Y los cordados son deuteróstomos, como también lo son los equinodermos (erizos y estrellas de mar, p.ej.) y otros bichos la mar de feos, los hemicordados

    Estos bichos se llaman precisamente hemicordados porque comparten un par de características clave con los cordados, a saber: hendiduras branquiales y un tubo neural dorsal hueco. De hecho, si no fuese porque les falta la notocorda, cualquiera diría que son unos cordados muy basales.

    Y ese es precisamente el problema, que cuando uno se pone a reconstruir la filogenia de los deuteróstomos, los hemicordados aparecen a veces como grupo hermano de los cordados, y otras aparecen como grupo hermano de los equinodermos.

    Cualquier cosa que nos ayude a comprender mejor a estos "gusanos" será de vital importancia puesto que puede arrojar luz sobre la posición filogenética del grupo entero. Si los hemicordados fuesen hermanos de los cordados, entonces la comparación de su morfología con la de urocordados y cefalocordados sería muy útil en la reconstrucción morfológica del cordado ancestral. Pero para eso tendríamos que saber cuál es la morfología basal de los propios hemicordados.

    Y ahí tenemos otro problema. Hay dos tipos de hemicordados, los microscópicos pterobranquios y los más grandecitos enteropneustos. Sin embargo había un tercer grupo, los lofenteropneustos, descrito sólo a partir de fotografías tomadas a unos gusanos espirales que habitan en las profundiades marinas, que parecía ser intermedio entre ambos y por lo tanto candidato perfecto a ancestro común.

    Pues va a ser que no. Por fin se han recogido ejemplares y tomado mejores fotografías y adivinad qué. Pues que adios características intermedias. Artefactos fotográficos o buena voluntad, eso es lo que eran. Estos gusanos espirales son enteropneustos. Raritos, eso sí.




    1. Holland, N. D. et al. Nature 434, 374–376 (2005).

Referencias (TrackBacks)

URL de trackback de esta historia http://evolucionarios.blogalia.com//trackbacks/28204

Comentarios

1
De: BioMaxi Fecha: 2005-03-17 16:20

Perfecto. Otro caso más en el que la ciencia avanza a base de tirar por los suelos lo que ya creíamos establecido y aumentando sustancialmente nuestra ignorancia.
¡Me encanta ser científico!



2
De: BioMaxi Fecha: 2005-03-17 18:23

Vaya, PZ Meyers ya lo ha comentado en Pharyngula.



3
De: BioMaxi Fecha: 2005-03-18 16:50

Comentario flamer:
¿A qué os recuerda la forma de los gusanos estos?



4
De: david zapata Fecha: 2006-01-19 04:00

quisiera saber si me podrian mandar una imagen del aparato circulatorio y excretos de estos organismos hemicordados y tambien del sistema branquial se los agradeceria DE TODO CORAZON GRACIAS



5
De: Amalio Fecha: 2006-01-19 09:00

¡ Enteropneustos, qué putada, la cagamos ! Jopé. Nuestro gozo en un pozo.



6
De: hello Fecha: 2006-01-27 04:41

k onda compas no mancehs con esto !!!! dadada



7
De: Desiderio Lucas Lopez Fecha: 2006-02-16 04:22

soy estudiante de biologia, estos animales son interesantes.
me gustaria que ofreca mas informacion de estos animales o en su defecto que recomiende bibliografia



8
De: Ana Fecha: 2006-09-25 16:59

Soy estudiante de Biología, y me gustaría saber más acerca de su filogénia, ya que es un gran dilema...



9
De: Norberto Medina Fecha: 2007-03-12 00:03

soy estudiante de biología, Un saludo muy afectuoso y cordial a los que hacen posible este tipo de documentos de gran importancia para el conocimiento y estudio de la zoología. Gracias!!!



10
De: david welber BRAZIL Fecha: 2007-03-28 14:28

soy estudiante de biologia, estos animales son interesantes.
me gustaria que ofreca mas informacion de estos animales o en su defecto que recomiende bibliografia



11
De: Anónimo Fecha: 2007-04-19 09:43

me importa un rabano xD



12
De: Anónimo Fecha: 2007-04-19 09:44

y a mi tmb :D muahahahaha



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De: anonimo 2 Fecha: 2007-04-19 09:49

Hola somos estudiantes de biología de chicaca y estamos muy enfadados con su mierda de pag.y sabes q sois para mi como pollas en sal y vinagre



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De: betty Fecha: 2007-05-21 23:36

este tema me interesa mucho por que la verdad es que me gusta mucho saber cosas de estos fabulosos animales.



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De: BETTINA Y CARLOS Fecha: 2007-05-21 23:38

DEL 25/04/03 HASTA ...............SIEMPRE



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De: bicho Fecha: 2007-06-19 06:08

mmmmmmm!!

mas de lo mismo de donde lo copiaron??
porke = te medio inconcluso la verdad!!



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De: que miarda les importa Fecha: 2007-06-23 17:43

es una miarda esta pàgina



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De: puto y boludo Fecha: 2007-06-23 17:47

bboooooooooolllll

udooooooooo

.....astanunca gamass............



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De: ttrthtr Fecha: 2007-06-23 17:50

fgtytrytt



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De: PACO Fecha: 2007-09-26 02:46

EN QUE PAIS Y EN QUE INSTITUCION ES EL QUE TIENE MAS ESTUDIOS DE HEMICHORDATA



21
De: luz Fecha: 2007-10-23 23:20

que buenas imagenes!



22
De: jazmin de gracia Fecha: 2007-11-09 21:05

podrian presentarme mas imagenes de las estructuras de hemichordata



23
De: Anónimo Fecha: 2008-05-12 20:07

encontre un gusano que nunca habia visto....le tome unas fotos y un video pero quiero saber que tipo de gusano es si me pueden ayudar les agradesco



24
De: adas Fecha: 2008-05-19 21:31

es muna pierda



25
De: Silvia Hernàndez Fecha: 2008-09-06 18:33

Me gustaría ver estados larvarios de los hemicordados y de los equinodermos. Para miclase de Cordados.
Gracias



26
De: facu Fecha: 2008-10-15 01:50

ijos de su madre la reputosima que te remiL···········



27
De: karen Fecha: 2008-11-19 18:41

me gusta los backyardigans



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De: karen Fecha: 2008-11-19 18:42

me gusta los backyardigans jejejeje soy de 1 secundaria instituto patria en rio blanco



29
De: karina Fecha: 2009-03-11 03:48

Esta muy interesante saber sobre estos gusanos.



30
De: yosi Fecha: 2009-04-26 17:22

qe feoz gusanoz!!!
m dan miedo!!!
peo son interesantes!!!
i feoz!!!
=)
peo m gustaria saber mas sobre elloz!!!
zih podrian conseguirme mas imagenes para mi clase de biologia !!!
les agradeceria!!!
=D



31
De: Anónimo Fecha: 2009-09-22 19:16

no les dan cosa



32
De: Anónimo Fecha: 2009-11-26 23:49

ta buena la informasion pero mejor seri si pudieran poner mas inf ormasion y mas gusanos hahahah



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B;
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