Paracalviria islandica Schockaert, Curini-Galletti, Ridder & Artois, 2011, n.sp.

• Main Authors: Schockaert, Ernest R., Curini-Galletti, Marco, Ridder, Wouter De, Artois, Tom
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2011
• Subjects: Biodiversity; Taxonomy; Animalia; Platyhelminthes; Rhabditophora; Seriata; Calviriidae; Paracalviria; Paracalviria islandica; Iceland
• Online Access: https://doi.org/10.5281/zenodo.6182157; http://treatment.plazi.org/id/55718796FFCFFFE2DB96668CFE6CFC13

Paracalviria islandica n.sp. Figs 7, 8, 9 C Synonym: Calviriidae gen. nov sp. nov. in Curini-Galletti et al. (2010). Diagnosis. Diagnosis of the genus; with about 60 atrial needles of 130–180µm. Occurrence. Iceland, Keflavik, close to the Sandgerdi Marine Centre, in the intertidal zone of a beach with medium sand (July, 1999). Material studied. Many animals studied alive, nine animals in eight whole mounts (only one female), one specimen squashed for karyology and mounted, and 10 sectioned specimens (two “adult males” and one young male; three fully developed females and two young females, two juveniles). One whole mount is designated the holotype (SMNH nr. 8098); all other material designated paratypes (UH 440-457). Derivation of the name. The beautifully arranged needles of the copulatory organ resemble those of the species of Calviria the species name refers to the location where the species was found. Description. The animals are whitish, 5–7mm long (measured in the whole mounts); there is seemingly no difference in size between the individuals in the male and in the female stage. There is a slight narrowing at the level of the brain and at the genital pore in the male stage. There are some sensory bristles at either side of the head (Fig. 7 A and B). The epidermis and cilia are around 3µm (on the dorsal as well as at the ventral side) with the nuclei sunk under the muscle layer, which consists of fine circular and slightly thicker longitudinal muscles. Large hyaline vacuoles, about 20µm high and 17µm broad occur all over the body, but mainly at the lateral sides and in the caudal region. In the male stage there are a few adhesive papillae at the tail, while in the female stage there are large glands opening in a row from the lateral sides over the ventral side (Fig. 7 D, E). The frontal glands converge to a slightly depressed sub-terminal area (Fig. 9 B). The anterior diverticulum of the gut runs clearly over the statocyst, and the gut itself runs to the very caudal end. The pharynx is at about 2/3 of the ...