. Bulletin. Natural history; Natural history. Fig. 85—Lateral view of Palaemonetes kadiakensis. as far west as eastern Texas, but it does not enter the Mississippi River system. In addition to P. kadiakensis and P. paludosus, the only freshwater species in the United States are highly localized spring- and cave-inhabiting forms in Texas (P. antrorum, P. holthuisi, and P. texanus) and Florida (P. cummingi) (Strenth 1976). Palaemonetes kadiakensis Rathbun (Fig. 85) Palaemonetes kadiakensis Rathbun 1902 Description.—P. kadiakensis is the only species of Palaemonetes with three apical setae on the
. Bulletin. Natural history; Natural history. Fig. 85—Lateral view of Palaemonetes kadiakensis. as far west as eastern Texas, but it does not enter the Mississippi River system. In addition to P. kadiakensis and P. paludosus, the only freshwater species in the United States are highly localized spring- and cave-inhabiting forms in Texas (P. antrorum, P. holthuisi, and P. texanus) and Florida (P. cummingi) (Strenth 1976). Palaemonetes kadiakensis Rathbun (Fig. 85) Palaemonetes kadiakensis Rathbun 1902 Description.—P. kadiakensis is the only species of Palaemonetes with three apical setae on the appendix masculina (Fig. 86) occurring in the freshwaters of the I'nited States (Fleming 1969). Rostrum straight; upper margin convex with 6-8, usually 7, teeth; lower margin with 2-3 teeth. Carapace with antennal and branchiostegal spines; branch- iostegal spine below branchiostegal groove. Abdomen humped at third segment; sixth abdominal slightly less than twice as long as fifth segment, slightly shorter than telson. Anterior pair of dorsal spines on telson usually distinctly behind middle of length, posterior pair near distal margin. Eyes large, pigmented. Lateral antennular flagellum with rami fused for 11-23 articles; free portion of shorter ramus with 3-8 articles. Scaphocerite about three times as long as wide, lamella overreaching distolateral tooth. Living specimens are transparent with green eyes, red-brown antennae, and many very small red-brown specks on the body. The internal organs are readily visible, and a bright green vege- tation-filled intestine is often a prom- inent feature. The species reaches a. Fig. 86.—Appendices masculina and interna (left) and entire second pleopod (right) of male Palaemonetes kadiakensis (after Meehean 1936).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original
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