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"Three stages in the development of Apus. fs, frontal sensory organ; L, digestive gland; s, carapace; 1-4, cephalic appendages; I-XIII, body segments and appendages." -Parker, 1900

Apus Stages

"Three stages in the development of Apus. fs, frontal sensory organ; L, digestive gland; s, carapace;…

Also known as fish lice, this is a species of copepod, a parasitic crustacean. "Female of Chondracathus gibbosus, enlarged; and example of the crustaceous Epizoa. B, ventral view; a, head; b, c, appendages; d, d, mediodorsal processes; e, e, medioventral processes; f, i, h, lateral processes; g, ovisacs; k, terminal segment; l, minute male lodged in vulva of female; m, n, mediodorsal ovarian tubes; p, lateral ovarian tubes; o, o, oviduct; 2, 3, antennules; 4, 5, 6, antennae, gnathites." -Whitney, 1911

Copepod

Also known as fish lice, this is a species of copepod, a parasitic crustacean. "Female of Chondracathus…

"A, Developed Endopodite, or ordinary ambulatory leg of the crawfish as a thoracic appendage: ab, the whole extent of the endopodite with seven joints; 1, coxopodite; 2, basipodite; 3, ischiopodite; 4, meropodite; 5, capopodite; 6, propodte; 7, dactylopodite; e, filaments borne on coxopodite; d, an epipodite. B and C, appendages respectively of first and second abdominal somite of th male: ab, endopodite; c, exopodite." -Whitney, 1911

Crawfish Leg

"A, Developed Endopodite, or ordinary ambulatory leg of the crawfish as a thoracic appendage: ab, the…

"Transverse section of thorax of crayfish, diagrammatic. abm, ventral abdominal muscles; bf, leg; bm, ventral nerve-cord; d, intestine; dbm, dorsal muscles of abdomen; ep, wall of thorax; h, heart; k, gills; kd, gill-cover; l, liver; ov, ovary; pc. pericardial sinus; sa. sn, sternal artery; vs, ventral sinus. The arrow shows the direction of the blood-current." -Parker, 1900

Crayfish Thorax

"Transverse section of thorax of crayfish, diagrammatic. abm, ventral abdominal muscles; bf, leg; bm,…