Synidotea ritteri Richardson 1904

Synidotea ritteri Richardson, 1904

Synidotea ritteri Richardson, 1904, pp. 219–220, figs. 99a, 100, 101a; 1905, pp. 377–378, figs. 409–410.—Hatch 1947, p. 220, pl. 8, fig. 98.—Menzies and Miller 1954, pp. 144, 154.—Schultz 1969, p. 64, fig. 69.

DIAGNOSIS.—Cephalon. Preocular horns large, projecting well beyond frontal margin; frontal border markedly excavate medially; eyes bulging, forming part of lateral contour; a pair of large spiniform tubercles anterior and medial to eyes; behind these is another pair of swollen tubercles.

Pereon. Dorsolateral surfaces of each somite with 2–4 rugosities in a transverse row; first two pereonites with lateral borders evenly rounded, not sharply angulate; borders of others straight.

Pleon. Posterior border with median excavation. Appendix masculina straight and pointed near apex which bears 2 setae, spines or scales lacking. Pleotelson slightly wider than long.

GEOGRAPHICAL RANGE.—Cox Bay, Vancouver Island, British Columbia, to Lands End, San Francisco, California.

LOCALITIES.—

British Columbia. Vancouver Island, Cox Bay, 15, 16 October 1970, M. A. Miller.

Oregon. Coos County, Coos Head, intertidal, 1940, G. M. Shearer.

California. Sonoma County: Goat Rock, 23 September 1968, J. Bodle; Shell Beach, intertidal, 10 July 1967, M. A. Miller; Schoolhouse Beach, intertidal, 24 September 1968, J. and J. Bodle; Bodega Head, 8 August 1967, J. Brill. Marin County: Dillon Beach, January 1935, O. Hartman; 15 May 1947, M. Barr; on algae, bryozoans, and hydroids (especially Aglaophenia), 1946–1947, R. J. Menzies; 26 October 1954, M. A. Miller and J. Downey.

intertidal