Medicinal leech swims, video


This video shows a medicinal leech, swimming about one meter below the water surface.

Diver Jos van Zijl from the Netherlands made the video. He remembers that last year, a leech bit him and sucked blood.

Worms on videos


This video says about itself:

Potworms (or Enchytraeids) are small white worms that live in environments that contain a high percentage of organic material (such as worm bins).

This is a time-lapse video about earthworms.

Medicinal leech swimming, video


This video about a swimming medicinal leech is by diver Jos van Zijl from the Netherlands.

He filmed it at the start of a dive. As Jos returned, the leech bit him and sucked blood. Jos van Zijl’s hand kept bleeding for two days.

New worm species discovery in the Netherlands


Cirriformia tentaculata in New Zealand

Translated from the Dutch marine biologists of Stichting ANEMOON:

Sunday, October 26, 2014

A new marine worm species, new for the Netherlands, has recently been discovered. Recreational divers found Cirriformia tentaculata in the central Oosterschelde estuary, and published their findings in ‘Het Zeepaardje’, the bimonthly magazine of the Strandwerkgemeenschap. It is not known whether the species has only just appeared on the Dutch coast, or that it had already been present for a long time but had never been discovered before because of its unobtrusive way of life.

Much sea life is hardly visible to the eyes of sport divers. At least 300 species of worms are known from our coastal waters. Many species live hidden in the sand and mud bottoms.

So, probably many worm species in the Netherlands have not been discovered yet.

The origin of annelids: here.

North Sea coral discovery


This video from Britain says about itself:

26 May 2014

Join us on a simulated journey through the undersea landscapes of the south west of England from Ilfracombe to delicate pink sea fans in Lyme Bay via Chesil Beach and Berry Head. Common cuttlefish, hermit crab, bootlace seaweed and long snouted sea horse can be found here. Watch plaice send a hermit crab packing before approaching The Lizard’s thick carpets of jewel anenomes, dead man’s fingers and Devonshire cup coral. As we reach the Atlantic we come across sun fish, lion’s mane jellyfish, basking sharks and bottle-nosed dolphins before surfacing at Ilfracombe in Devon. Grey seals swim along corkwing wrasse, ballan wrasse and swimming crabs all searching for food amongst sponges.

Translated from Ecomare museum on Texel island in the Netherlands, 16 September 2014:

During a 10-day diving expedition in the North Sea there were a number of discoveries in ancient sunken ships. The rare polychaete worm Sabellaria [spinulosa] was found for example. But the most remarkable find was a piece of Devonshire cup-coral. Although this species lives occasionally near the English east coast, it was the first time that hard coral was found in the middle of the North Sea.

Tapeworm discovery in prehistoric domestic dog


Echinococcus granulosus tapeworm

From the Journal of Archaeological Science, Volume 50, October 2014, Pages 51–62:

Multicomponent analyses of a hydatid cyst from an Early Neolithic hunter–fisher–gatherer from Lake Baikal, Siberia

Highlights:

Echinococcus granulosus infection in an 8000-year-old forager from Siberia.

Differential diagnosis of egg-like, multi-chambered ovoid calcifications.

Stable carbon and nitrogen isotopes of a parasitic hydatid cyst.

Abstract:

Calcified biological objects are occasionally found at archaeological sites and can be challenging to identify. This paper undertakes the differential diagnosis of what we suggest is an Echinococcus granulosus hydatid cyst from an 8000-year-old mortuary site called Shamanka II in the Lake Baikal region of Siberia. Echinococcus is a parasitic tapeworm that needs two hosts to complete its life cycle: herbivores and humans are intermediate hosts, and carnivores such as dogs, wolves, and foxes are definitive hosts.

In the intermediate host the Echinococcus egg hatches in the digestive system, penetrates the intestine, and is carried via the bloodstream to an organ, where it settles and turns into an ovoid calcified structure called a hydatid cyst. For this object, identification was based on macroscopic, radiographic, and stable isotope analysis. High-resolution computed tomography scanning was used to visualize the interior structure of the object, which is morphologically consistent with the E. granulosus species (called cystic Echinococcus).

Stable isotope analysis of the extracted mineral and protein components of the object narrowed down the range of species from which it could come. The stable carbon and nitrogen isotope ratios of the object’s protein, and stable carbon isotope ratio of the mineral, closely match those of the likely human host. Additionally, the δ13C protein-to-mineral spacing is very low, which fits expectations for a parasitic organism. To our knowledge this is the first isotopic characterization of a hydatid cyst and this method may be useful for future studies. The hydatid cyst most likely came from a probable female adult. Two additional hydatid cysts were found in a young adult female from a contemporaneous mortuary site in the same region, Lokomotiv. This manuscript ends with a brief discussion [of] the importance of domesticated dogs in the disease’s occurrence and the health implication of echinococcal infection for these Early Neolithic hunter–fisher–gatherers.

Hoopoe eats worm, video


In this video from the Netherlands, a hoopoe eats a worm.

Saskia Verberne made this video.

Hoopoe in Katwijk, photos here.