Kantaro – Siebold earthworm

by M. Aikawa


Do you feel the impression of how the creature that earthworm? Bad feeling, No touch, In the soil…should have different impression. By the way , do you know “Kantaro”? It is a species of earthworm , and the annelid worms of the family Futomimizu, which is a large type.In general has been known by the name of Von Siebold earthworm, is said that the origin of the name.

Description & Taxonomy

Kantaro bear the scientific name to Pheretima sieboldi (Horst.), a large earthworm belonging to the genus of the family Futomimizu,Futomimizu rope, Annelida Oligochaeta. Although the length of the individual will be 25 ~ 28cm, to about 14 ~ 15mm thick and mature, with large populations more than 30g body weight, reach more than 40cm in length exists.
For the whole body is indigo blue, and determine the species is easy. Light hits the light and sleek, it is very beautiful earthworm.

Range & Ecology

Siebold earthworms are distributed around Shikoku, Kyushu, Chugoku and down into the Ryukyu Islands. But south of Yakushima they are not distributed. Closely related species are widely distributed around the world, particularly in Southeast Asia.

In Japan, over 60 species of the genus Futomimizu are distributed. They are living up to several cm from the surface of the soil under deciduous forest mainly, and seems to winter deep into the warm ground in the winter. That inhabit the forests of various types, such as cedar and cypress plantation and broadleaf forest. During the rainy season is often witness to appear on the surface.


Earthworm excrete feces on the absorption of particulate organic matter and microbial digestion, the small animals in the soil. By it, and has been the formation of soil suitable for plant growth.Therefore, it is treated as a beneficial insect in agriculture in general, be used for soil improvement. They are about the same amount of food ingested from half of body weight per day, that feces can be used as a high-quality fertilizer and soil conditioner.

There is a method given as feed for earthworms to organic matter such as garbage actively from this, that excrement be used as a fertilizer called “worm composting”.

View point

They can be found anywhere after a heavy rain, especially on the mountain behind the shrine in Asakura.


by K. Nagao


Octopus are very delicious living things and the octopus is located in a line with the supermarket. The appearance of an octopus is bad but octopus dumplings, sushi, etc. have many uses. An octopus has the area currently disliked overseas but in Japan, it is one of the fish and shellfishes liked very much.

Description & Taxonomy

An octopus is a mollusk. The tentacle of an octopus has a powerful beak in the inner part of a leg by eight. An octopus is an expert of disguise and changes its color of the body to a surrounding scene. An octopus defends itself from an enemy by this capability. Moreover, when attacked by the enemy, an octopus vomits sumi and escapes.

Range & Ecology

The octopus inhabits the sea in Japan and relatives of the octopus is all over the world. The kind which has poison in the octopus is also. The legs of an octopus are 8 and it can move them freely. These play an active part, also when gaining food. The favorite foods of an octopus are a shellfish and a crab, are caught using this leg and eaten with the beak in the inner part of a leg. An octopus is nocturnal. It is hidden by rock the daytime.

Use & Conservation

An octopus becomes a target of fishing or a fisherman catches it. An octopus is used as sushi sliced raw fish etc.and eats.


An octopus is seen if it goes to a supermarket, the sea, a market, and an aquarium. The Katsurahama aquarium will be recommended if you think that he will see an octopus in Kochi.