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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Dadayiella

Dadayiella Kofoid & Campbell, 1929

[ref. ID; 3597]
Lorica elongate goblet-shaped, with or without a flaring distinct collar, usually having a pedicel with or without a bulb at its tip; oral aperture circular, entire; wall single-layered with a number of striae on the surface of the anterior part of the lorica. (ref. ID; 3597)
Type species; Dadayiella ganymedes (Entz) Kofoid & Campbell (ref. ID; 3597)
  1. Dadayiella ganymedes (Entz, 1884) (ref. ID; 4600) reported year? (ref. ID; 3544) or (Entz) Kofoid & Campbell (ref. ID; 3597) reported author and year? (ref. ID; 4464)
  2. Dadayiella pachytoecus (ref. ID; 3319)

Dadayiella ganymedes (Entz, 1884) (ref. ID; 4600) reported year? (ref. ID; 3544) or (Entz) Kofoid & Campbell (ref. ID; 3597) reported author and year? (ref. ID; 4464)

Descriptions

The lorica is elongate goblet-shaped with a slight flaring oral region provided with a number of longitudinal striae. The aboral horn is conical with few spiral striae. (ref. ID; 3544)
Lorica tall goblet-shaped, 2.9-3.2 oral diameters in length; oral margin entire, more or less flaring (18-20 degrees); bowl narrowest near the anterior one-half of the lorica, 0.85 of an oral diameter in smallest diameter, then gradually dilating to the widest part, its greatest diameter usually equal to that of the oral aperture; aboral region convex conical; pedicel tapering (20-25 degrees) to a pointed tip, 0.07-0.11 of the total length; wall provided with seven long striae and with short ones to the same number on the surface of the upper half of the lorica. (ref. ID; 3597)

Comments

The lorica of the specimens examined in the study has no suboral striae as that of those recorded from the Tropical West Pacific (Hada, 1938), and without a knob on an aboral horn as in the specimens reported by Balech (1959) from the Mediterranean Sea. (ref. ID; 3544)
The species differs from D. pachytoecus (Jorgensen) in bearing no differentiated collar. This species is variable in total length, general contour, and number of suboral striae especially a marked variation is seen in the shape of the pedicel. Specimens of the South Sea Islands and the Malay Archipelago on which the present descriptions have been based, have a short hyaline pedicel pointed at the terminal without an ornamentation or an appendage as shown by Marshall (1934) in specimens obtained from the Great Barrier Reef. Hada observed specimens having variously formed pedicels from Japanese waters: some of them are provided with a diamond-shaped, globose, or irregular bulb at the tip of the pedicel, while others show several vertical striae or ridges on a conical pedicel. Such forms, different from each other and including various intermediate ones, often appear together in the same collection. From these observations on the variations of this species, Brandt's species, bulbosa (1906-07), Jorgensen's variety, tenuicauda and formae, obtusa and acuta (1924), and Kofoid & Campbell's species, jorgenseni (1929), are variable forms of this species. (ref. ID; 3597)

Measurements

Length 95; breadth 25; oral diameter 30 um. (ref. ID; 3544)
Length 75-105; oral diameter 25-30 um. (ref. ID; 3597)