Comprehensive Description

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Adult Lt 615–772 µm; LPh 205–215 µm to PhJIn at U33–U28 (Fig. 2). Body transparent, strap-shaped, dorsoventrally flattened, but vaulted dorsally; head small, pyriform, truncated apically, with a broad circumcephalic band of cilia at U02–U05, separated from the rest of the body by a long gradual neck constriction; trunk narrow, bowed slightly outward along the mid-gut, and then narrowing again to a rounded, slightly flaired caudum. Widths of head /neck /trunk /caudal base /caudal flair, and locations along the length of the body are as follows: 44 /32 /63 /24 /28 µm at U05 /U07 /U54 /U95 /U96, respectively. Cuticle is flexible, epidermis finely granular, but lacking glands.  Adhesive tubes:TbA 4 per side (L 8–9 µm), borne on broad fleshy hands that insert at U08; TbVL 6 per side (L 15–18 µm), 5 inserted regularly from U27 to U51 and the 6th at U72, one between pharyngeal pores and PhJIn, the others in the fore- and midgut region; TbP 16 total (L 7–10 µm), inserting in a single row about the flaired caudum.  Ciliation:A number of cilia insert on each side of the head (L 9–18 µm); a broad transverse band of cephalic cilia (L 18–20 µm) covers the broadest part of the head from U02 to U05 and joins the locomotor ciliature ventrally; some 30–32 sensory hairs occur in lateral (L 9–12 µm) and dorsolateral (L 18–20 µm) columns along either side of the trunk at U06–U96. Ventral locomotor ciliature forms two longitudinal bands of short (L 9–12 µm), scattered cilia that follow the lateral body contours beneath the entire length of the body, separate medially beneath the head and pharynx, but converging behind the anus and merging into a single band onto the caudum.  Digestive tract:Mouth is terminal, of medium width (6 µm diameter); buccal cavity nearly cylindrical, lined with cuticule of medium thickness; pharynx narrows toward the rear, but with basal pharyngeal pores showing dorsolateraly; intestine broadest in the rear mid-gut region, narrowing behind; anus is ventral at U95.  Reproductive tract:Hermaphroditic; testes begin at the PhJIn, vasa differentia lead rearward past U50, but termini not seen; ovary solitary, lying above the foregut on the right side, with a column of multiple ova developing toward the rear, reaching 115 × 40 µm in size; frontal and caudal organs not seen.  Ecology:Occasional in frequency of occurrence (10–30% of samples), scarce to prevalent in abundance (3% to more than 30% of a sample, the latter often a sub-[sdom]or co-dominant[cdom]);littoralin fine, well sorted sand to very fine-very coarse, poorly-extremely poorly sorted, clean to detrital sand at 0–10 cm depth, meanlow water to extreme low water; mostlysublittoralin very fine to medium, well to medium sorted, clean silicious or coralline sands, sometimes mixed with shell and/or coral gravel, at 0.5–8 m water depth.


Creative Commons Attribution 3.0 (CC BY 3.0)

© William D. Hummon

Source: ZooKeys

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