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Many caridean shrimps live in symbiosis with bivalves, the shrimps finding refuge and food in the mucus in their host's mantle cavity. We report for the first time the presence of Pontonia margarita Verrill, 1869 on both coasts of Baja California Peninsula, Mexico, as a symbiont of the pen shell Pinna rugosa Sowerby, 1835. The symbiont was found in Laguna Ojo de Liebre (LOL), which faces the Pacific Ocean, and in Bahía Concepción (BC), on the eastern coast facing the Gulf of California. A total of 569 specimens of Pinna rugosa were studied, 472 from LOL (104–277 mm shell length (SL)) and 97 from BC (130–234 mm SL). A total of 376 Pontonia margarita individuals were extracted in LOL (19–41 mm total length (TL)) and 41 in BC (20–48 mm TL). The prevalence of Pontonia margarita was 46% in LOL and 28% in BC. The regression analyses for both sexes of Pontonia margarita showed a high correlation between TL and total weight and abdominal length and TL. The data showed a moderate correlation between TL and the length of the major and minor chelae, and TL and length of the minor chela. There was no significant relationship between biometric parameters of the host and the symbiont. The presence of gravid females of Pontonia margarita (52% in LOL and 39% in BC) in shells suggests reproduction during autumn. [ABSTRACT FROM AUTHOR]

The objective of this study was to compare the experience and distribution of tooth loss in people with and without diabetes. The authors conducted a comparative cross-sectional study of patients at a public university. Analysis included medical records of those treated from 2013 through 2017. The dependent and main independent variables were the number of missing teeth and a diagnosis of diabetes, respectively. As covariables, the authors analyzed the sociodemographic and socioeconomic characteristics, as well as the general and oral health status of patients. A multivariate model based on negative binomial regression was constructed. Of the 3,406 medical records analyzed, 64.2% (n = 2,185) pertained to women, the mean age was 42.45 years, 87.9% did not have diabetes, and 12.1% had received a diagnosis of diabetes. The mean (standard deviation) number of missing teeth was 7.46 (7.89), 7.09 (7.60) in patients without diabetes, and 10.12 (9.32) in patients with diabetes. According to our final multivariate model, the expected mean number of missing teeth was 11.4% higher in patients with diabetes than in those without (P =.006). For every 1-year increase in age, the expected mean number of missing teeth increased by 3.9% (P <.001). Other variables related to tooth loss included occupation, marital status, and type of insurance. The results of the study indicate that the mean number of missing teeth is higher in people with diabetes and suggest that certain socioeconomic inequalities exist in the area of oral health. The population needs to be apprised of the impact of diabetes on oral health. [ABSTRACT FROM AUTHOR]