What are the basic characteristics of protochord data

Difference Between Protochord Dates and Euchor Dates

Protochordate versus Euchoristic date

Protochordata and Euchordata are two main groups of Phylum chordata; So before we get to know the difference between Protochordata and Euchordata, let us first briefly discuss the Chordata. Chordata is the most advanced and probably best-known group of organisms in all of the animal kingdom, including humans. They are bilateral, deuterostomial eucoelomats. The most basic features of the chordata include the presence of dorsal hollow nerves, notochord and pharyngeal gill slits. These features are present in all chord data in every phase of their life. The other advanced functions that help chords dominate over other phyla are the presence of a living endoskeleton, efficient breathing, efficient circulation, and a centralized nervous system. There are three main subphyla found in the phylum chordata, namely: urochordata, cephalochordata, and vertebrata. Of these three, the first two subphyla are collectively referred to as protochordata, which comprise lower / primitive chordates. Vertebrates are classified as Euchoristic dates, including higher chords.

What are protochordates?

Protochordates are made up of the organisms that are categorized under Subphyla Urochordata and Cephalochordata. Are protochordates also called Acraniata, due to the Lack of head and skull. These organisms are extremely marine and have small bodies.

What are Eucharistic dates?

Euchoristic dates are higher choral dates to which the animals of the Subphyla Vertebrata. In contrast to Protochord Dates, Euchor Dates therefore have a prominent head and skull called Craniata. Subphyla Vertebrata is divided into two groups. (a) Agnatha, This includes the animals that do not have real jaws and paired attachments, and (b) Gnathostomata, These include the vertebrates with real jaws and paired appendages.

What is the difference between Protochor Dates and Euchor Dates?

• Protochordates are also called Acraniata because of the lack of a head and skull. Euchoristic dates are called craniata because of the presence of the head and skull.

• Protochordates are exclusively marine with small bodies, while Euchordates are found in both aquatic and terrestrial habitats and have large bodies.

• Euchoristic dates have a well-developed head and exoskeleton with two pairs of appendages. However, protochor data has no attachments and no exoskeleton.

• Protochordates have an enterocoelic coelom, whereas Euchordates have a schizocoelic coelom.

• In contrast to Euchoristic dates, protochord dates have no spine.

• In contrast to protochord dates, notochord is covered or replaced by a spine in Euchoristic dates.

• Protochordates have a pharynx with permanent gill clefts. Throat gill columns of the Euchoristic dates remain or disappear.

• Protochordates have chambers without hearts, but Euchordates have hearts with chambers (2 to 4 chambers).

• With protochord dates, the kidneys contain protonephridia, whereas the kidneys contain meso- or metanephridia during euchordates.

• The propagation of the Protochord is either sexual or asexual, while that of the Euchor is always sexual.

• Gonoducts are usually absent from protochord data, while they are always present in Euchor data.

• In Euchordates development is indirect or direct, with or without a larval stage, while in Protochordates development is indirect with a free-swimming larval stage.

Images courtesy of:

  1. Protochordate by Jon Houseman (CC BY-SA 3.0)
  2. Eucharistic dates via Wikicommons (Public Domain)