Taliepus

Members of Taliepus can be distinguished from other Epialtidae by their association with kelp habitats and morphological adaptations for clinging to macroalgae. Specific diagnostic features for genus-level identification require examination of carapace shape, rostral spines, and male gonopod morphology; these traits are best assessed with reference to taxonomic keys for Majoidea. The three described species (T. dentatus, T. marginatus, T. nuttallii) differ in distribution and subtle morphological characters.

Kelp forests and subtidal habitats dominated by macroalgae, particularly Macrocystis pyrifera and Lessonia trabeculata. Taliepus marginatus shows habitat partitioning: juvenile and immature crabs are more abundant in dense Macrocystis pyrifera forests, while reproductive adults predominate in more open Lessonia trabeculata stands.

Pacific coast of South America, with documented populations in Chile. Taliepus dentatus occurs across multiple latitudes with locally adapted populations; Taliepus marginatus occurs in northern Chile; Taliepus nuttallii (southern kelp crab) distribution requires verification.

Taliepus marginatus exhibits ontogenetic dietary shifts: smaller crabs consume higher proportions of kelp tissues, while larger crabs incorporate more animal food. Feeding occurs primarily nocturnally in both kelp forest types.

Direct development through brooded embryos to planktonic zoea larvae. Female T. dentatus brood embryos with development time negatively affected by temperature. Zoea I larvae are planktonic and subject to temperature-dependent survival and performance. Larval thermal tolerance varies between populations, suggesting local adaptation. Short copulatory durations and full seminal receptacles contribute to single paternity patterns.

Nocturnal feeding activity with higher food consumption at night. Female brooding behaviors are plastic and respond to temperature and hypoxia stressors, including increased embryo ventilation under high temperature and low dissolved oxygen conditions. Males rarely mate or display guarding behavior when other males are present, indicating sperm competition avoidance. Females are receptive approximately 50% of the time but do not exhibit mate selection during pre-copulatory periods.

Taliepus marginatus functions as both herbivore and omnivore in kelp forest ecosystems, with ontogenetic shifts in trophic position. Juvenile crabs serve as nursery inhabitants in dense Macrocystis pyrifera forests, while adults occupy reproductive habitats in Lessonia trabeculata stands. The species contributes to kelp forest trophic dynamics and may influence macroalgal tissue consumption patterns.

Subject to male-biased fishing pressures; T. dentatus has evolved reproductive strategies including year-round mating success and sperm storage capabilities that may buffer against demographic skew from selective harvest. Thermal tolerance studies have used this genus as a model for understanding climate change effects on marine invertebrate larvae.

• PugettiaAnother kelp crab genus in Epialtidae; distinguished by carapace shape and rostral spine morphology
• EpialtusType genus of Epialtidae; Taliepus differs in specific carapace and gonopod characteristics

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life
• Single paternity in the kelp crab Taliepus dentatus despite polyandry
• Thermal tolerance of crustacean larvae (zoea I) in two different populations of the kelp crabTaliepus dentatus(Milne-Edwards)
• Combined effects of temperature and hypoxia shape female brooding behaviors and the early ontogeny of the Chilean kelp crab Taliepus dentatus
• The Effects of Temperature on the Swimming Performance, Starvation‐Survival and Morphometrics of Zoea 1 Larvae of the Kelp Crab (Taliepus dentatus) From Central Chile
• Demography and feeding behavior of the kelp crab Taliepus marginatus in subtidal habitats dominated by the kelps Macrocystis pyrifera or Lessonia trabeculata