Adineta sp. 18

Adineta sp.18, creeping specimen, dorsoventral view. This is one of several morphotypes that have been found in the ephemeral puddles (lithotelma; see image below) on the granite rocks of the coast of Brittany (France). (Another Adineta morphotype from such a lithotelma is documented here). This morphotype is characterised by the red-orange color of the integument. There are some Adineta-species listed in the literature with red integument: A. grandis/ A. fontanetoi and A. emsliei. (1)
Adineta sp.18, lateral view of specimen trying to extract diet from the particle. (1)
Adineta sp.18, three aspects of the anterior part, from dorsal to ventral:
1. Focus plane on the dorsal area with ?nerve cells?
2. optical median section; focus plane on the brain (Br), mastax (Mx), and the dorsal mastax glands (DMG). The asterisks mark hypodermis cells. SC: sensory cilia; RL: rostrum lamella. The buccal tube length is short (ratio BTL : RaL ≈ 1)
3. ventral view Focus plane on the ciliary field. The arrows point to the prehensile apparatus with back-folded rakes, so that the U-hooks are only allusively visible. (1)
Adineta sp.18, rake of a macerated specimen with 6/6 U-hooks. (1)
Adineta sp.18, left image: foot with short spurs (ratio SL : SSW ≈ 0.65 ) and distinct tip. Interspace between spurs (ratio SIW : SBW≈ 2.2). Right image: short dorsal antena, frontal view. (1)
Adineta sp.18; two aspects of the ramate trophi with dental formula 2/2; left: cephalic view; right: caudal view. From the left image the number of minor teeth is 29 in each uncus. Ramus length (RaL) is 21µm. (1)
Adineta sp.18; this specimen is from the same sample, which had been dried for 18 months befor water was added again. Two hours later this image of a living and creeping specimen was taken. (2)
This morphotype differs from Adineta sp.17, which has also a reddish integument, by the form of the rostrum lamella and the NoUH; which is 5/5 in A. sp. 17.
Location : Kerfiat, Brittany, France, coastline
Habitat: lithotelma on granite rocks (click on image to enlarge)
Date: coll.: 21.08.2020 (1; 2);img. : 21.08.2020 (1); 03.03.2022 (2)
freshwater life
marine life