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This communication reports the smallest verified egg-carrying specimen of CulZinecfes supidus. With a carapace 20 mm long by 47 mm wide, the female measures considerably less than most other mature individuals, but about the same as an average-sized individual infected with an adult specimen of the rhizocephalan Loxothyhcus texunus. We report what we believe to be the smallest known eggbearing specimen of Callinectes sapidus Fbthbun. The crab’s identification is based primarily on the two broad triangular frontal teeth on the carapace, orange-red coloration at the articulations, and orange fringes on chelae tipped with purple (Williams 1974; verified by Williams, personal communication). Using the specified dimensions described by Williams (1974), the specimen measured 20.0 mm long by 36.0 mm wide at the bases of lateral spines and 46.7 mm wide including the lateral spines (Figure 1). The crab, deposited in the Gulf Coast Research Laboratory Museum (GCRL 1 12 l), came from 0.9 meters of 17-ppt water (29°C) on 14 June 1983, immediately south of Raccoon Point on the westernmost island of the Isle Derneires chain delimiting Caillou Bay, Louisiana. Its egg mass appeared brown because the orange-colored embryos had already developed large darkly pigmented eyes. Initially, the berried crab occurred with three individuals parasitized by the rhizocephalan cirriped Loxorhyhcus rexanus Boschma and was mistakenly considered to be infected. In fact, most small portunids with a semisubcircularshaped abdomen shown to us by fishermen who thought they had mature females were infected by the rhizocephalan. The mature parasite has a protruding externa similar in appearance to a crab’s egg mass. Mature uninfected female specimens of C. sapidus slightly larger than the one we report are known. Williams (1974) examined one 21 mm long by 5 5 mm wide,includinglateral spines, and Fischler (1959) reported three 22 to 24 mm long by 52 to 55 mm wide from North Carolina where the parasite apparently did not exist. Causes for dwarfing in C. sapidus are poorly understood. We know that the r.hi.zocephalan L. texanus, which ranges from at least Panama (Boschma 1950) to Biscayne Bay, Florida (Overstreet 1983), stunts growth and feminizes Manuscript received Sept. 12,1983; accepted Sept. 16,1983. Figure 1. Egg-bearing Cbllinectes supidus (GCRL 1121) next to a 17.9-mm-diameter U. S. ten cent coin. males (e.g., Overstreet 1983). About one half of the rhizocephalan-infected crabs that we examined ranged between 40 and 55 mm wide (Figure 2), and the average width for infected ones in Louisiana collections was 58 mm (Adkins 1972). These parasitized crabs were smaller than mature females from the same locality (Figure 3). Other disease agents as well as genetic and environmental influences may also cause individuals to be abnormally small. For example, Tagatz (1968) reported that a much larger percentage of

An Unusually Small Egg-Carrying Callinectes sapidus in the Northern Gulf of Mexico, with Comments on the Barnacle Loxothylacus texanus