Ragworms and Allies from Airport Rd, Sitka, AK, US on June 2, 2026 at 09:02 PM by annanw

POLYCHAETA Phyllodocida - Nereididae Ragworms and Allies Phyllodocidae Eulalia microphylla New Zealand Paddle Worm Sabellida - Serpulidae Spirobranchus cariniferus Blue Tube Worm Serpulid...

Ragworms and Allies from Hoonah-Angoon, AK, USA on May 23, 2011 at 05:44 PM by Joe Tomoleoni. large worm (1m/3ft+ in length) swimming at surface or just subsurface

Perinereis cultrifera (Grube, 1840), comúnmente conocido como gusano coreano o coreano en el ámbito de la pesca, es un anélido poliqueto de la familia Nereididae ampliamente distribuido en zonas costeras. Es una especie de gran importancia económica debido a su uso extendido como cebo vivo en la pesca deportiva y como alimento en la acuicultura de crustáceos.

In this study, we propose a new biometric methodology for annelids, based on the number of chaetiger segments as an indicator of growth (independent variable), relating to other structures, such as the number of paragnaths and parapodia, using the commercial species Hediste diversicolor (Müller, 1776) as a model. This species belongs to the family Nereididae, found in estuarine environments along the European Atlantic coast (DOI 10.11646/zootaxa.5696.1.2). This species has several appendages with sensory functions along the body that help the animal navigate in its environment. It also has specialised feeding structures in the peristomium that are essential for taxonomic identification, called paragnaths. The parapodium has distinct chaetal arrangements that distinguish it from other species in the same genus. Due to the importance of economic activities such as fishing and aquaculture, this ragworm is a typical protagonist for studies in multiple areas, with a well-documented life cycle. However, knowledge is lacking on the growth and evolution of individual structures and appendages of the body in this species during its life cycle. Our findings revealed a significant positive correlation between the number of chaetiger segments and most of the morphological structures analysed, evidencing a proportional growth of most of these features, related directly to the chaetigers segments. Simple chaetae, a specific type of chaeta only present in the genus Hediste, were only found in individuals with more than 25 chaetiger segments, possibly indicating a functional change as the worm matures. Simple chaetae tend to be found earlier along the body axis, closer to the median chaetiger as the organism matures. The results illustrate how H. diversicolor develops over time, highlighting the developmental processes and representing the first biometric study of nereidid polychaetes, based on chaetiger count as a proxy for biometric growth, to define new possible life cycle stages, for supporting aquaculture purposes and other research fields.

Platynereis dumerilii (Annelida, Nereididae) es un poliqueto cuyo ciclo vital se caracteriza por varias transiciones en el comportamiento y en el hábitat. La larva primaria, de vida libre y nadadora, sufre una metamorfosis y se asienta en hábitats someros con vegetación. En esta fase, Platynereis secreta tubos de moco que quedan adheridos a la vegetación. Tras otra metamorfosis, el adulto ya maduro nada hasta la superficie del agua y libera los gametos para una fecundación externa.

Abstract. The status of the subfamily Dendronereidinae has been subject to uncertainty, because its primary defining morphological character (the presence

Heteronereis: The Sexual Phase of Nereis – Morphology, Life Cycle, Habitat, and Reproductive Adaptations Introduction Heteronereis represents a distinctive sexual form or epitokous phase in certain polychaete worms, particularly those within the genus Nereis (family Nereididae). Unlike the usual benthic crawling larvae or adults, Heteronereis are free-swimming mature worms specialized for reproduction. This transformation involves profound morphological and physiological changes primarily in the posterior segments, allowing these worms to leave their burrows and swim to the water's surface for spawning.

Nereis: Biology, Classification, Habitat, and Life Cycle of the Marine Polychaete Worm Introduction Nereis, commonly known as ragworms or clam worms, is a genus of marine polychaete worms belonging to the family Nereididae. These worms are one of the most widespread and abundant annelids found in marine environments, particularly in sandy and muddy coastal areas. Nereis species play vital ecological roles, including sediment aeration and serving as important prey for fish, birds, and other marine animals.

Ragworms and Allies in June 2018 by Aleš Buček

Polychaetes deposit-feeders are considered very important in the process of bioturbation in aquatic sediments and especially in the mineralization of organic matter, that generally is controlled by some abiotic factors as temperature, light...

Polychaetes deposit-feeders are considered very important in the process of bioturbation in aquatic sediments and especially in the mineralization of organic matter, that generally is controlled by some abiotic factors as temperature, light...