Intraspecific behaviors and major cheliped sexual dimorphism in three congeneric callianassid shrimp

Spatial distribution and population dynamics of Callichirus major (Crustacea, Callianassidae) in a tropical sandy beach, northeastern Brazil

“…Similar results were reported in the states of Pernambuco (Botter‐Carvalho et al., ) and Paraná (Souza et al., ). Distinct sexual dimorphism after maturation is a common trait among callianassids (Hartnoll, ; Pinn, Atkinson, & Rogerson, ; Shimoda, Wardiatno, Kubo, & Tamaki, ). For females, the observed increase in length is presumably an adaptation connected with ovary accommodation and egg carrying (Pinn et al., ), while males invest in the development of chelipeds (Shimoda et al., ; Souza et al., ).…”

“…Distinct sexual dimorphism after maturation is a common trait among callianassids (Hartnoll, ; Pinn, Atkinson, & Rogerson, ; Shimoda, Wardiatno, Kubo, & Tamaki, ). For females, the observed increase in length is presumably an adaptation connected with ovary accommodation and egg carrying (Pinn et al., ), while males invest in the development of chelipeds (Shimoda et al., ; Souza et al., ). The major cheliped is a secondary sexual character in adult males, and they use their large chelipeds either for fighting between males or for attracting females (Shimoda et al., ; Simão & Soares‐Gomes, ; Souza et al., ).…”

“…For females, the observed increase in length is presumably an adaptation connected with ovary accommodation and egg carrying (Pinn et al., ), while males invest in the development of chelipeds (Shimoda et al., ; Souza et al., ). The major cheliped is a secondary sexual character in adult males, and they use their large chelipeds either for fighting between males or for attracting females (Shimoda et al., ; Simão & Soares‐Gomes, ; Souza et al., ). Indeed, the weight of the major cheliped in a male of C. major corresponds to 33.2% of its total weight (Souza et al., ).…”

The distribution and some features of the biology of the ghost shrimp Nihonotrypaea japonica (Ortmann, 1891) (Decapoda: Callianassidae) from the Volchanka River estuary (Vostok Bay, Sea of Japan)

“…The results of measuring and weighing were used for the determination of the size structure of the ghost shrimp population and for estimation of biomass. The sex of animals was determined by complex morpho logical characters that differ in males and females (the size of the large claws in the first pair of pereiopods, the presence/absence of the first pair of pleopods) and by the different coloration of their pleon [16,22,23,25]. The damaged individuals whose sex could not be determined were distributed equally between males and females.…”

Variation in Morphometric Characters in Four Sand Crab (Albunea symmysta) Populations Collected from Sumatra and Java Island, Indonesia

“…Wardiatno and Tamaki (2001) studied the morphological characters of two Japanese ghost shrimps, Nihonotrypaea japonica and N. harmandi, to separate the two species by identification. Some researchers have used morphological characters to show sexual dimorphism in decapod crustaceans using their chelipeds (e.g., Shimoda et al 2005;Claverie & Smith 2010;Trevisan et al 2012), which was believed to be a consequence of the common male habits of combat, contest, and courtship (e.g., Hartnoll 1974).…”