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Tuatara: Volume 8, Issue 1, October 1959

Figs. 4-11. Various kinds of prostomium — Figs. 4, 5. Tanylobous prostomium — 4: Dorsal aspect. Grooves defining limits of prostomium extend back right across segment 1. 5: Lateral aspect. Prostomium overhangs mouth opening. — Figs. 6, 7. Prolobous prostomium — 6: Dorsal aspect. The prostomium appears as a small lobe, marked off by a transverse groove from segment 1. 7: Lateral aspect. — Figs. 8-11. Two varieties of epilobous prostomium — Longitudinal grooves defining limits of prostomium exten…

Figs. 4-11. Various kinds of prostomiumFigs. 4, 5. Tanylobous prostomium 4: Dorsal aspect. Grooves defining limits of prostomium extend back right across segment 1. 5: Lateral aspect. Prostomium overhangs mouth opening. Figs. 6, 7. Prolobous prostomium 6: Dorsal aspect. The prostomium appears as a small lobe, marked off by a transverse groove from segment 1. 7: Lateral aspect. Figs. 8-11. Two varieties of epilobous prostomium Longitudinal grooves defining limits of prostomium extend back on to segment 1, but not to the posterior margin of the segment. The prostomium may be marked off by a transverse groove at the end of the longitudinal grooves (as in Figs. 10, 11) or there may be no transverse groove (as in Figs. 8, 9). Figs. 12-16. Clitellum. Various arrangements: all diagrams illustrate lateral aspect of body. Figs. 12, 13: Clitellum completely surrounding segments. In Fig. 12 the intersegmental furrows are entirely obliterated; in Fig. 13 intersegmental furrows are still visibe, but slightly suppressed. Nephridiopores in line with chaeta c in Fig. 12, in line with chaeta d in Fig. 13. Figs. 14, 15: Clitellum developed only on dorsal and lateral aspects of segments. Nephridiopores in line with chaeta d in Fig. 14. Fig. 16: Clitellum developed only as a darker pigmented patch on the body wall; dorsal and lateral only. Nephridiopores in line with chaeta d. Figs. 17-20. Various arrangements of chaetae; diagrammatic representations of chaetal arrangements as seen in a cross-section of the body Fig. 17: Eight chaetae per segment, arranged in pairs; this the most common chaetal arrangement. Fig. 18: Eight chaetae per segment, arranged in pairs; the body is more or less square in section and the pairs of chaetae are located on the corners of the square. This arrangement of chaetae is found in a number of species of Maoridrilus and Neodrilus. Fig. 19: Eight chaetae per segment; the chaetae are not in pairs, but are fairly evenly spaced on each side of the body. Fig. 20: Eight chaetae per segment; the chaetae are irregularly spaced.

Figs. 4-11. Various kinds of prostomium
Figs. 4, 5. Tanylobous prostomium
4: Dorsal aspect. Grooves defining limits of prostomium extend back right across segment 1. 5: Lateral aspect. Prostomium overhangs mouth opening.
Figs. 6, 7. Prolobous prostomium
6: Dorsal aspect. The prostomium appears as a small lobe, marked off by a transverse groove from segment 1. 7: Lateral aspect.
Figs. 8-11. Two varieties of epilobous prostomium
Longitudinal grooves defining limits of prostomium extend back on to segment 1, but not to the posterior margin of the segment. The prostomium may be marked off by a transverse groove at the end of the longitudinal grooves (as in Figs. 10, 11) or there may be no transverse groove (as in Figs. 8, 9).
Figs. 12-16. Clitellum. Various arrangements: all diagrams illustrate lateral aspect of body.
Figs. 12, 13: Clitellum completely surrounding segments. In Fig. 12 the intersegmental furrows are entirely obliterated; in Fig. 13 intersegmental furrows are still visibe, but slightly suppressed. Nephridiopores in line with chaeta c in Fig. 12, in line with chaeta d in Fig. 13. Figs. 14, 15: Clitellum developed only on dorsal and lateral aspects of segments. Nephridiopores in line with chaeta d in Fig. 14. Fig. 16: Clitellum developed only as a darker pigmented patch on the body wall; dorsal and lateral only. Nephridiopores in line with chaeta d.
Figs. 17-20. Various arrangements of chaetae; diagrammatic representations of chaetal arrangements as seen in a cross-section of the body
Fig. 17: Eight chaetae per segment, arranged in pairs; this the most common chaetal arrangement. Fig. 18: Eight chaetae per segment, arranged in pairs; the body is more or less square in section and the pairs of chaetae are located on the corners of the square. This arrangement of chaetae is found in a number of species of Maoridrilus and Neodrilus. Fig. 19: Eight chaetae per segment; the chaetae are not in pairs, but are fairly evenly spaced on each side of the body. Fig. 20: Eight chaetae per segment; the chaetae are irregularly spaced.