Photo of the day (32): eggs of Arion vulgaris

Eggs of Arion vulgaris are laid in clutches. Each egg is 3 mm in diameter. There are 45 eggs in this clutch and dimension of this clutch is 21 mm × 18 mm. This is a fresh clutch laid in the same day as the photo was taken.

Arion vulgaris eggs 1

Arion vulgaris eggs 2

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Dangling slug Arion fuscus

I found a slug Arion fuscus dangling on its mucus thread. I found it on a waste container in the street, in Olomouc city, the Czech Republic, on the September 16, 2014. Such species usually live in woods, but it can be found in gardens too.

dangling slug Arion fuscus 2
dangling slug Arion fuscus 1

It was moving down quite fast. The difference between the first and the second photo is 20 seconds.

As we know, some snails and slugs can move down on the mucus thread like a spider on a spider thread. Such locomotion is considered to be unusual.

There is a detail of Arion fuscus cropped from the first photo:

dangling slug Arion fuscus 1 detail

Further reading:

Breure B. 2011: “Dangling snails – an update“. Bram’s snailblog.

Breure B. 2011: “Dangling snails – update (2)“. Bram’s snailblog.

Breure B. 2013: “Dangling Jamaican snail“. Bram’s snailblog.

Wiktor A. & Stawarczyk T. 2012: “AN UNUSUAL MODE OF LOCOMOTION OF AN ECUADOREAN SLUG BELOCAULUS SP. (MOLLUSCA: GASTROPODA: VAGINULIDAE)“. Folia Malacologica 19(4): 277–278. (PDF free download after free registration)

Photo of the day (31): Helicigona lapicida

This photo is a four-eyed beast in a psychedelic green forest.
Helicigona lapicida 01
No, I was joking, these are two Helicigona lapicida snails on a lichen.

An apical view:
Helicigona lapicida 02

Another apical view:
Helicigona lapicida 03

The right side:
Helicigona lapicida 04

A top view:
Helicigona lapicida 05

A right side views:
Helicigona lapicida 06
Helicigona lapicida 07

Two snails on a rock:
Helicigona lapicida 08

Why it is on those stones on these photos? It is because inhabits rocks and walls. It is quite common snail already described by Carl Linnaues in 1758. Linnaues used the specific name lapicida for this snail, because he thought that its mucus can dissolve limestone rocks. The Latin word lapis means the “stone”, the Latin suffix -cida means “cut out”. The Latin word lapicida means the “stonecutter”. It can not dissolve stones in fact.

The foot:
Helicigona lapicida 09

The umbilical view:
Helicigona lapicida 10

Six Helicigona lapicida snails in situ in Kamenice castle on the Zámecký vrch hill in Česká Kamenice town (Northern Bohemia, Czech Republic.)
Helicigona lapicida 11

What does it eat on those rocks? Lichens. Like this one:
Helicigona lapicida 12

References:

(in Czech) Blažka F. (1892). Na venkově po dešti. Vesmír, 22(3): 5-6.

Lapicide. Wictionary, accessed September 12, 2014.

Etymology of the Latin word lapicida. myEtymology, accessed September 12, 2014.