DALYELLIIDA, Meixner, 1924

Faubel, A. & Warwick, R. M., 2005, The marine flora and fauna of the Isles of Scilly: Free-living Plathelminthes (‘ Turbellaria’), Journal of Natural History 39 (1), pp. 1-45 : 40

DALYELLIIDA sp. 1

( Figure 10 )

Material examined

Sites 6, 7, 13, 14, 15: abundant; several specimens in squash preparation.

Morphology

Length of body in squash preparation up to 1.1 mm; outline of body with characteristic head, 0.26 mm long, broadly rounded, separated from mid-body by a slight incision forming a circular groove; at each side, groove marked with bundles of 76 M m long cilia. Posterior body end tapering to a blunt point provided with a bundle of up to 130 M m long cilia. From time to time mid and posterior body exhibits very slight incisions ( Figure 10 ) simulating pseudo-segmentations. Around head and margin sensory cilia, 93 M m long, present in more or less close serial sequence. Epidermis with 39 M m long cilia, rhabdites absent. Colour yellow-red-brown. Head with two crescentic eyes, 64 M m long and 125 M m distant from each other. Pharynx doliiformis 132 M m long, opens immediately behind ventral groove. Intestine with ingested diatoms.

Reproductiυe system. Specimens were sexually immature.

Figures

Figure 10. Dalyelliida sp., dorsal view in squash preparation. Scale bar: 250 Mm.