21:04:2010 15:45 Thorsten Henrich platynereis_stage platynereis_stage This is an OWL translation of an ontology whose native representational form is .obo. The translation was performed using the oboInOwl xslt library. For details, see http://www.berkeleybop.org/obo-conv.cgi Platynereis developmental stage Developmental stages are typically demarcated by the timing of appearance, loss or transformation of specific anatomical structures. A Platynereis developmental stage is an occurrent that is a temporal subdivision of a Platynereis dumerilii development. PLATY:T_Henrich http://purl.org/obo/owl/PLATY#PLATY_T_Henrich platynereis_stage Zygote stage At a temperature of 18 C this stages lasts from 0.00 hours till 2.00 hours. First developmental stage with the following key events: Fertilized egg before the onset of cleavage. Jelly forms, cortical migration of lipid droplets. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 0-2 zyg PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Cleaving embryo stage At a temperature of 18 C this stages lasts from 2.00 hours till 7.00 hours. Developmental stage following Zygote stage with the following key events: Spiral cleavage pattern with individually identifiable blastomeres. First and second cleavage inequal and meridional. Third cleavage forms micromeres and macromeres. Ends with the appearance of the fourth quartette of micromeres. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 2-7 cle PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Stereoblastula - Stereogastrula stage At a temperature of 18 C this stages lasts from 7.00 hours till 12.00 hours. Developmental stage following Cleaving embryo stage with the following key events: Spherical mass of dividing blastomeres whose cell lineage can no longer be followed by eye. Micromeres divide bilaterally. Epibody starts. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 7-12 ste PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Protrochophore stage At a temperature of 18 C this stages lasts from 13.00 hours till 24.00 hours. Developmental stage following Stereoblastula - Stereogastrula stage with the following key events: Pre-larva, slowly rotating in the jelly driven by the multi-ciliated equatorial prototroch cells. Apical tuft appears. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 13-24 pt PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Early trochophore stage At a temperature of 18 C this stages lasts from 24.00 hours till 26.00 hours. Developmental stage following Protrochophore stage with the following key events: Hatching larvae actively swimming in the water column but yet without phototaxis. First pigment appears in the larval eyes. Telotroch forms. Apical ganglion forms. One serotonergic cell in the brain. First larval brain axon. Prototroch nerve develops. Ventral nerve cord is v-shaped. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 24-26 et PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Mid-trochophore stage At a temperature of 18 C this stages lasts from 26.00 hours till 40.00 hours. Developmental stage following Early trochophore stage with the following key events: Free-swimming trochophores showing phototaxis. Increasing amount of shading pigment in the larval eyes. Stomodeal rosette starts forming and moves anteriorly. The body shape starts to change from spherical to conical. Variable: Red pigment spots around the prototroch cells. Second cerebral commissure, future nuchal organ nerve and asymmetric axon develop. Three more serotonergic cells around apical ganglion, first commissure in the ventral nerve cord, dorsal and ventral longitudinal muscles appear. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 26-40 mt PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Late trochophore stage At a temperature of 18 C this stages lasts from 40.00 hours till 48.00 hours. Developmental stage following Mid-trochophore stage with the following key events: Distinct stomodeal opening surrounded by stomodeal rosette. First chaetae visible inside the trunk. Three larval segments appear simultaneously identifiable by the developing chaetae in the trunk. Macromeres narrower towards the posterior. Second commissure forms in the ventral nerve cord. Dorsal and ventral longitudinal muscles elongate. First signs of oblique and parapodial muscles. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 40-48 lt PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Early metatrochophore stage At a temperature of 18 C this stages lasts from 48.00 hours till 51.00 hours. Developmental stage following Late trochophore stage with the following key events: Formation of the first paratroch at the posterior border of the second chaetigerous segment. Chaetae reach the body wall. The number of cells contributing to the stomodeal rosette is slowly increasing. Red pigment at the telotroch can appear. Third commissure forms in the ventral nerve cord. Second and third pair of serotonergic cells in the ventral nerve cord. Oblique and parapodial muscles more numerous and elongated. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 48-51 emt PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Mid-metatrochophore stage At a temperature of 18 C this stages lasts from 51.00 hours till 60.00 hours. Developmental stage following Early metatrochophore stage with the following key events: Pigment of the adult eyes clearly visible lateral-dorsally in the episphere. Chaetae outside the body wall. Amount of pigment in the adult eyes increases. Chaetae increase in length. The gut anlage becomes visible. Additional ring of cells surrounds the stomodeal opening from anterior to posterior. Lumen of the stomodeum starts to invaginate into the head. Second paratroch forms at the posterior border of the first chaetigerous trunk segments. Increasing number of axons in the commissures. Convergent extension movements start in the ventral neuroectoderm and continues until 72hpf (Steinmetz et al., 2007), Fourth pair of serotonergic cells in the ventral nerve cord. Ventral medial longitudinal muscle starts forming. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 51-60 mmt PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Late metatrochophore stage At a temperature of 18 C this stages lasts from 60.00 hours till 66.00 hours. Developmental stage following Mid-metatrochophore stage with the following key events: Formation of the parapodia and the chaetae of the third chaetigerous segment reach to the posterior end of the larvae. Body shape changes from conical to torpedo-like and slender. Formation of the akrotroch starts. Stomodeal opening becomes slit-like. Ventral medial longitudinal muscle elongates. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 60-66 lmt PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Early nectochaete stage At a temperature of 18 C this stages lasts from 66.00 hours till 75.00 hours. Developmental stage following Late metatrochophore stage with the following key events: Formation of the metatroch; formation of the akrotroch completed. The parapodia can be moved independently. Rapid trunk elongation. Anlage of the proctodeum becomes visible. Occasionally larvae crawl using their parapodia. Much stronger pigmentation in the adult eyes. Lipid droplets move posteriorly. 1-2 pigmented spots at the basis of each parapodium. Dorsal and ventral roots of the circumesophageal connectives approach each other. More serotonergic cells in the ventral nerve cord. Muscles form anteriorly to the stomodeum. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 66-75 en PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Mid-nectochaete stage At a temperature of 18 C this stages lasts from 75.00 hours till 144.00 hours. Developmental stage following Early nectochaete stage with the following key events: Formation of the antennae, antero-dorsal pair of tentacular cirri, and anal cirri. Palpae start forming. Progression from planktic to benthic lifestyle. Body shape changes from torpedo-like into worm-like. Head distinguishable from the trunk due to a constriction. Adult eyes grow in size and are only separated by a medial constriction. Jaws start forming. Macromeres start to cellularize and form midgut epithelium. Proctodeum develops a cylindrical tube shape. The stomodeum and proctodeum get in contact with the midgut. Pigmented spots at the base of the parapodia increase in size. Additional pigment appears in the head region. Brain grows. Additional serotonergic cells in the brain. Segmental nerves can be identified. Pharynx musculature, muscles and nerves of the antennae, tentacular cirri, palpae and anal cirri develop. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 75-6d mn PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Late nectochaete stage At a temperature of 18 C this stages lasts from 144.00 hours. Developmental stage following Mid-nectochaete stage with the following key events: Beginning of food intake. Lipid droplets are finally totally resorbed. Jaws rapidly increase in size. Additional teeth are added. End of synchronized development between individuals. Spinning glands develop and start to form mucus. Palpae elongate slowly. Antennae, antero-dorsal tentacular cirri and anal cirri elongate rapidly. At the end of this stage the forth chaetigerous segment is fully formed. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer 6d-2w ln PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Praemetamorphic juvenile stage Developmental stage following Late nectochaete stage with the following key events: Fifth chaetigerous body segment forms. Swimming behavior changes from gliding using cilia to wiggling by undulatory body movements. The juveniles undergo second metamorphosis by transforming the first pair of parapodia into the posterior pair of tentacular cirri. Larval eyes disappear during metamorphosis. Palpae and antennae elongate slowly. The anal cirri elongate rapidly. The midgut elongates rapidly with the elongating body. Jaws grow in size. More teeth are added. Pharynx develops into an eversible proboscis. Larvae form characteristic tubes in which they live. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer pre juv PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Postmetamorphic worm (atoke form) stage Developmental stage following Praemetamorphic juvenile stage with the following key events: Metamorphosis is finished and the posterior pair of tentacular cirri is formed. More segments are formed by the posterior growth zone. The more anterior segments grow in size. The diameter of the worm increases. Gamete production starts in the coelom at around 50 segments. Growth rate slows down until up to 70 segments. Gametes start to mature inside the body. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer post juv PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage Adult (Heteronereis) stage Developmental stage following Postmetamorphic worm (atoke form) stage with the following key events: Epitoke metamorphosis. End of food intake resulting in an empty gut. Eyes increase in size. Part of the chromatophores degenerates inside the body. Maturing females become yellow and maturing males become white (anterior) and red (posterior). Posterior parapodia flatten and develop paddle-like chaetae. Major parts of the musculature degenerate and a new muscle type for rapid swimming develops. Mature animals become pelagic; deliver the gametes; eggs are fertilized in the water; males and females die after spawning. PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer adult PLATY:A.H.L.Fischer http://purl.org/obo/owl/PLATY#PLATY_A.H.L.Fischer platynereis_stage begins at end of platynereis_stage