what is the meaning of balanoglossus

What type of animal is Balanoglossus?

Balanoglossus is an ocean-dwelling acorn worm (Enteropneusta) genus of great zoological interest because, being a Hemichordate, it is an "evolutionary link" between invertebrates and vertebrates. Balanoglossus is a deuterostome, and resembles the Ascidians or sea squirts, in that it possesses branchial openings, or "gill slits".

What is Balanoglossus clavigerus?

Balanoglossus is a tuberculos or burrowing and exclusively marine animal. It is found in shallow waters between tide marks along the coast of warm and temperate oceans. Balanoglossus clavigerus is a U-shaped excavated in a sandy bottom Nemertines resemble flatworms and possess a long protrusible proboscis.

Is Balanoglossus a deuterostome?

Balanoglossus is a deuterostome, and resembles the Ascidians or sea squirts, in that it possesses branchial openings, or " gill slits ". It has notochord in the upper part of the body and has no nerve chord.

What is the TSS of balanoglosus?

T.S. Proboscis of Balanoglosus 3. T. S. Collar Region 4. T.S. Branchiogenital Region. 1. It is the longitudinal section of anterior part of Balanoglossus. 2. In it the three fundamental regions of body of the animal are visible i.e., proboscis, collar and trunk.

What is the Balanoglossus?

Balanoglossus is an ocean-dwelling (only Marine water dwelling, not fresh water dwelling) acorn worm (Enteropneusta) genus of great zoological interest because, being a Hemichordate, it is an "evolutionary link" between invertebrates and vertebrates. Balanoglossus is a deuterostome, and resembles the Ascidians or sea squirts, in that it possesses branchial openings, or " gill slits ". It has notochord in the upper part of the body and has no nerve chord. It does have a stomochord, however, which is gut chord within the collar. Their heads may be as small as per 2.5 mm (1/10 in) or as large as 5 mm (1/5 in).

Where is Balanoglossus found?

It is found in shallow waters between tide marks along the coast of warm and temperate oceans.

What are the differences between annelids and balanoglossus?

2) The metamerically arranged nephridia of annelids are not present in Balanoglossus. 3) The cleavage of egg of annelids is spiral and determinate while that of Balanoglossus is radial and indeterminate.

Which stage of the trisegmental condition is also found in an embryonic stage of Amphioxus?

The five coelomic cavities of Balanoglossus constituting the trisegmental condition are also found in an embryonic stage of Amphioxus. The enterocoelic origin of coelom in Balanoglossus and Amphioxus is also of greater phylogenetic significance than the resemblances in the gill-slits, and so-called notochord and dorsal tubular nerve cord.

How many gill slits are there in a Balanoglossus?

Some authors doubt whether the gill-slits of Balanoglossus really are pharyngeal clefts as in one species of Balanoglossus, there are as many as 700 pairs of gill-slits. In higher chordates, the pharyngeal region is very short with generally 5 or 6 pairs of gill-slits. (3) Dorsal tubular nerve cord.

Who suggested affinities of Balanoglossus with annelids?

Spengel (1893) suggested affinities of Balanoglossus with annelids.

Is Balanoglossus an ocean dwelling worm?

Balanoglossus. See text. Balanoglossus is an ocean-dwelling (only Marine water dwelling, not fresh water dwelling) acorn worm (Enteropneusta) genus of great zoological interest because, being a Hemichordate, it is an "evolutionary link" between invertebrates and vertebrates. Balanoglossus is a deuterostome, and resembles ...

What is the meaning of balanoglossus?

Balanoglossus is developed from two Greek words, balanos meaning an acorn (fruit of oak) and glossa meaning tongue. Delle Chiaje first recorded the animal from the Naples region in 1829 and gave the name Balanoglossus clavigerus.

How does Balanoglossus move?

The animal moves by alternate lengthening and shortening of the body produced by the action of muscle fibres.

How big is the Balanoglossus gigas?

But Balanoglossus aurantiacus of the south eastern coast of the United States attains about 1 meter in length. The largest acorn worm Balanoglossus gigas reaches is more than 2.5 metre in length and ranges from North Carolina, Brazil to Cape Hatteras. It can construct a burrow up to a depth of 75 cm or more.

What is the shape of the Balanoglossus clavigerus?

The burrow of Balanoglossus clavigerus is U-shaped with two openings 10 to 20 cm apart (Fig. 2.2). The anterior end of the burrow is funnel-like and the posterior end is round. The anterior vertical part of the burrow may be branched. The ani­mal moves inside the burrow.

How many species of balanoglossus are there?

Balanoglossus is a marine animal and inhabits all the seas of the world. About 20 species of Balanoglossus have been recorded in the tropical and sub-tropical seas.

Where does Balanoglossus clavigerus burrow?

It is mostly an inhabitant of intertidal zone, although a few descend to about 100 m of the sea. Balanoglossus excavates its own burrow in sand or sandy mud. The burrow of Balanoglossus clavigerus is U-shaped with two openings 10 to 20 cm apart (Fig. 2.2).

Does Balanoglossus have regenerative properties?

Balanoglossus exhibits great regenerative potency. Isolated pieces from the trunk have the inherent property to regenerate the lost parts.