Patiria pectinifera

Lore & Background

Patiria pectinifera is often referred to in literature as Asterina pectinifera, though the accepted name is now Patiria pectinifera. It is native to the Sea of Japan, East China Sea, and Yellow Sea, and extends along the Russian coast from Posyet Bay to the Strait of Tartary and southern Sakhalin. It inhabits the shallow subtidal zone on stony seabeds and other substrates down to 40 metres (130 ft).

The starfish feeds on algae, sea grasses, detritus, and small invertebrates, preferring coarse sediment over fine sediment. It everts its stomach over food to digest it in situ. It may be preyed upon by the carnivorous starfish Luidia quinaria. In Peter the Great Gulf, it breeds twice a year, in autumn and spring, with females spawning about 500,000 eggs annually.

A relaxin-like peptide, previously called 'Gonad Stimulating Substance', has been found in this starfish. Evidence suggests the peptide is involved in reproductive processes and functions via a G protein-coupled receptor, supporting its relatedness to vertebrate relaxins.

Reader's Guide

Patiria pectinifera has been used as a model organism in developmental biology due to several practical advantages. It is common, easy to collect, and easy to maintain in the laboratory. Both adults and larvae tolerate a range of conditions, and adults are non-specialist feeders. The chunky body shape makes them easy to handle, and wounds heal well; individuals recover easily from surgery and can be used repeatedly for further experiments. The oocytes are large and transparent and remain viable when removed from the gonads, making them suitable for studies of oocyte maturation, fertilization, and larval development.

A notable experimental finding is that if the embryo is dissociated into its constituent cells, the cells can re-aggregate into a viable bipinnaria larva. First the external epithelium forms, then internal structures develop, followed by gastrulation via invagination and development of a mouth. The presence of a relaxin-like peptide, previously called 'Gonad Stimulating Substance', and its action through a G protein-coupled receptor, provides evidence for its relatedness to vertebrate relaxins and its role in reproductive processes.

Did You Know?

• It may be preyed on by the carnivorous starfish Luidia quinaria.
• Females spawn about 500,000 eggs each year, breeding twice a year in autumn and spring in Peter the Great Gulf.

Taxonomy and Nomenclature

The blue bat star, a member of the starfish family Asterinidae, carries a name that has shifted over time in the scientific literature. For many years, researchers and field biologists encountered this species under the designation Asterina pectinifera, a name that appeared widely in published works. However, taxonomic revisions have since reclassified it under the genus Patiria, making Patiria pectinifera the currently accepted scientific name. This nomenclatural change reflects the broader practice in invertebrate zoology of refining genus boundaries as our understanding of evolutionary relationships deepens. Despite the shift in its formal designation, the common name "blue bat star" persists as a recognizable identifier among marine biologists and enthusiasts who work in the northern Pacific. The species' placement within Asterinidae situates it among a group of starfish that share certain morphological and ecological traits, though the blue bat star's particular utility in laboratory research has set it apart from many of its relatives in the eyes of developmental biologists.

Range and Habitat

Patiria pectinifera occupies a well-defined stretch of the northern Pacific Ocean, with its native range spanning the Sea of Japan, the East China Sea, and the Yellow Sea. Along the coastlines of Japan, China, and the Russian Federation, this starfish is a familiar presence in coastal waters. In Russian waters specifically, its distribution extends from Posyet Bay eastward to the Strait of Tartary and includes the southern portion of Sakhalin Island. The species inhabits the shallow subtidal zone, favoring stony seabeds and other hard substrates, and can be encountered at depths reaching up to 40 metres, roughly 130 feet. This preference for relatively shallow, structured habitats means the blue bat star is accessible to divers and researchers working in nearshore environments. Its range across three national jurisdictions and multiple seas underscores the species' adaptability within the temperate northern Pacific, while its confinement to the subtidal zone on firm substrates highlights a specific ecological niche that distinguishes it from more pelagic or deep-water echinoderms.

Feeding Ecology and Reproductive Cycle

As a generalist feeder, Patiria pectinifera draws its nutrition from a varied menu that includes algae, sea grasses, accumulated detritus, and small invertebrates. Rather than being restricted to a single food source, this starfish thrives on coarse sediment habitats over fine ones, where its preferred prey items are more readily available. Its feeding method is characteristic of many echinoderms: the animal everts its stomach directly over a food item, digesting the material externally in its immediate environment before reabsorbing the nutrients. At the top of its local food web, the blue bat star is not without predators; the carnivorous starfish Luidia quinaria has been documented as a natural enemy. Reproductively, populations in Peter the Great Gulf exhibit a bimodal breeding pattern, spawning in both autumn and spring. Each female produces approximately 500,000 eggs annually, a substantial investment that underscores the species' reliance on high fecundity to offset the losses typical of open-water larval dispersal.

A Workhorse of Developmental Biology

Few marine invertebrates have earned as prominent a place in the developmental biology laboratory as Patiria pectinifera. Its appeal to researchers is practical and multifaceted: the species is abundant, straightforward to collect, and remarkably easy to maintain under laboratory conditions. Both adults and larvae tolerate a wide range of environmental parameters, and the adults' generalist feeding habits simplify husbandry. The starfish's chunky, robust body shape makes physical handling straightforward, while its capacity to heal wounds rapidly means individuals can undergo surgical procedures and recover well enough to be reused in subsequent experiments. Perhaps most importantly, its oocytes are large, transparent, and remain viable even after removal from the gonads, making them ideal for studying oocyte maturation, fertilization, and early larval development. Researchers have demonstrated that when an embryo is dissociated into individual cells, those cells can spontaneously re-aggregate into a living bipinnaria larva, with the external epithelium forming first, followed by internal structures, gastrulation through invagination, and ultimately the development of a mouth. Additionally, a relaxin-like peptide—once called "Gonad Stimulating Substance"—has been identified in this species, functioning through a G protein-coupled receptor and showing evolutionary relatedness to vertebrate relaxins.