scholarly journals Population characteristics and planktonic larval stage of the New Zealand screwshell Maoricolpus roseus

2008 ◽  
Vol 74 (2) ◽  
pp. 191-197 ◽  
Author(s):  
T. A. Probst ◽  
C. M. Crawford
Keyword(s):  
New Zealand ◽  
Larval Stage ◽  
Population Characteristics ◽  
Planktonic Larval Stage

Phoronida

2017 ◽  
Author(s):  
Judith Fuchs
Keyword(s):  
Life Cycle ◽  
Small Group ◽  
Larval Stage ◽  
Intertidal Zone ◽  
Marine Invertebrates ◽  
Tree Of Life ◽  
General Morphology ◽  
Family Level ◽  
Planktonic Larval Stage

This chapter describes the taxonomy of Phoronida, a small group of exclusively marine invertebrates found in most of the world's oceans from the intertidal zone to about 400 metres depth. Phoronids are meroplanktonic with a planktonic larval stage usually less than 2 mm in length and a benthic adult whose length ranges from a few cm up to 50 cm. The chapter covers their life cycle, ecology, and general morphology. It includes a section that indicates the systematic placement of the taxon described within the tree of life, and lists the key marine representative illustrated in the chapter (usually to genus or family level). This section also provides information on the taxonomic authorities responsible for the classification adopted, recent changes which might have occurred, and lists relevant taxonomic sources.

Dodecaceria berkeleyi n.sp., a Polychaete (Family Cirrutulidae) from New Zealand

1971 ◽  
Vol 28 (10) ◽  
pp. 1437-1443 ◽  
Author(s):  
G. A. Knox
Keyword(s):  
New Species ◽  
New Zealand ◽  
Asexual Reproduction ◽  
Larval Stage ◽  
Diagnostic Characters ◽  
Polychaete Family ◽  
A New Species

The described species of the genus Dodecaceria are reviewed. Fourteen species are recognized and their diagnostic characters are given. A new species, Dodecaceria berkeleyi, is described from New Zealand where it is found boring in the shells of large gastropod molluscs. An outline is given of the nature of the skin pigments, which are similar to the arenicolochrome of lugworms. Asexual reproduction in the genus is reviewed, and an account is given of autotomy in D. berkeleyi, followed by regeneration to give rise to two individuals, a method of reproduction similar to that which occurs in the colonial tube builder Dodecaceria fistulicola. An advanced larval stage found in the burrows of D. berkeleyi is described.

Skeletal characters for identification of juvenile Ophiactis resiliens and Amphiura constricta (Echinodermata): cryptic ophiuroids in coralline turf habitat

2006 ◽  
Vol 86 (5) ◽  
pp. 1199-1207 ◽  
Author(s):  
I. Falkner ◽  
M. Byrne
Keyword(s):  
Larval Stage ◽  
Early Stage ◽  
Skeletal Development ◽  
Algal Turf ◽  
Disc Diameter ◽  
Planktonic Larval Stage

Skeletal development of Ophiactis resiliens and Amphiura constricta was examined to determine characters that could be used to identify the juveniles of these species, which co-occur in algal turf habitat. Juvenile O. resiliens recruit to turf after a planktonic larval stage while A. constricta recruit through release from brooding adults. Skeletal development in O. resiliens and A. constricta is typical of most ophiuroids with diagnostic adult characters taking some time to appear. The main characters that can be used to distinguish the two species from an early stage are the number and arrangement of the oral papillae and the presence of disc spines. In O. resiliens diagnostic adult skeletal characters developed at 1.5 mm disc diameter. In A. constricta most identifying adult characters were evident at 700 μm disc diameter. Identification of juvenile O. resiliens is assisted by the presence of disc spines and thorny arm spines, features that disappear as the juveniles grow. Juvenile A. constricta did not develop disc spines or thorns on the arm spines.

scholarly journals TeamMate: a longitudinal study of New Zealand working farm dogs. I. Methods, population characteristics and health on enrolment

2020 ◽  
Vol 16 (1) ◽  
Author(s):  
Katja E. Isaksen ◽  
Lori Linney ◽  
Helen Williamson ◽  
Nick J. Cave ◽  
Ngaio J. Beausoleil ◽  
...  
Keyword(s):  
Longitudinal Study ◽  
New Zealand ◽  
Population Characteristics

scholarly journals TeamMate: A longitudinal study of New Zealand working farm dogs. I. Methods, population characteristics and health on enrolment.

2020 ◽  
Author(s):  
Katja Elisabeth Isaksen ◽  
Lori Linney ◽  
Helen Williamson ◽  
Nick J Cave ◽  
Ngaio J Beausoleil ◽  
...  
Keyword(s):  
Risk Factors ◽  
Longitudinal Study ◽  
New Zealand ◽  
Body Condition Score ◽  
Population Characteristics ◽  
Factors Affecting ◽  
Husbandry Practices ◽  
Condition Score ◽  
Physical Examinations ◽  
On Farm

Abstract Background Working farm dogs are invaluable on New Zealand sheep and beef farms. To date no study describing farm dog population and health has included information about incidence of illness and injury, or risk factors affecting health and career duration. This paper describes the methodology and initial results from TeamMate, a longitudinal study that was designed to address this gap. We describe the study population, husbandry practices, and prevalence of clinical abnormalities on enrolment. Methods Data about the farms, owners, husbandry practices and dogs were collected on farm at approximately 6-month intervals. All dogs over 18 months old and in full work were enrolled. Dogs were given physical examinations by veterinarians. On examination all abnormalities were noted, regardless of clinical significance. Results Six hundred forty-one working farm dogs and 126 owners were enrolled from the South Island of New Zealand. Forty-nine percent of dogs were Heading dogs (314 of 641) and 48% Huntaways (308 of 641). Median age of dogs was four years (range 1.5 – 14) and median body condition score (BCS) was four on a 9-point scale (interquartile range (IQR) 3 – 5). Fifty-four percent of dogs were male (345 of 641), and 6% (41 of 641) were neutered. Eighty-one percent of owners (102 of 126) fed dogs commercial biscuits and meat sourced on farm. Forty-four percent of dogs (279 of 641) had bedding in their kennel, 14% (55 of 393) had insulated kennels, 69% (442 of 641) had been vaccinated and 33% (213 of 641) were insured. Clinical abnormalities were found in 74% of dogs (475 of 641). Common abnormalities involved the musculoskeletal system (43%, 273 of 641), skin (including scars and callouses; 42%, 272 of 641), and oral cavity (including worn and broken teeth; 35%, 227 of 641). Conclusions Our results expand on those from previous surveys and indicate that musculoskeletal illness and injury, and skin trauma are the most commonly seen clinical abnormalities in working farm dogs. These results will provide a baseline for investigation of incidence and risk factors for illness, injury, retirement and death in New Zealand working farm dogs.

Australasian Simuliidae

1925 ◽  
Vol 15 (3) ◽  
pp. 213-255 ◽  
Author(s):  
A. L. Tonnoir
Keyword(s):  
New Species ◽  
New Zealand ◽  
Larval Stage ◽  
New Genus ◽  
Adult Stage ◽  
Pupal Stage ◽  
Early Stages ◽  
Australian Region

1. In this paper five species of Simulium and 16 species of Austrosimulium are dealt with.2. The new genus Austrosimulium differs mainly from the former in the number of joints in the antennae, which are ten instead of eleven; it seems to be restricted to the Indo-Australian region.3. In many cases the species of Austrosimulium cannot be differentiated from each other in the adult stage, although they are perfectly different in their early stages and especially in the pupal stage.4. Seven species of Austrosimulium occur in New Zealand: A. vexans, Mik, A. ungulatum, sp. n., A. australense, Schin., A. tillyardi, sp. n., A. longicorne, sp. n., A. multicorne, sp. n., A. laticorne, sp. n. Only the first two of these are distinguishable from the others in the adult stage; the remainder can only be differentiated in the pupal stage or the late larval stage.5. Five out of these seven New Zealand species are known in their early stages.6. In Australia (including Tasmania) five species of Simulium and nine of Austrosimulium are known to the writer, i.e.: S. aurantiacum, sp. n., S. fergusoni, sp. n., S. ornatipes, Skuse, S. umbratorum, sp. n., S. terebrans, sp. n., A. crassipes, sp. n., A. cornutum, sp. n., A. tasmaniense, sp. n., A. victoriae, Roub., A. furiosum, Skuse, A. bancrofti, Taylor, A. torrentium, sp. n., A. simile, sp. n., A. weindorferi, sp. n.The two species A. victoriae, Roub., and A. furiosum, Skuse, have not been identified with certainty, so that further investigation may show that one or two of the new species are synonymous with them.7. The early stages of one species of Simulium and five of Austrosimulium from Australia are here described.

scholarly journals THE LITTLE BIVALVE Planktomya UNMASKED

2016 ◽  
Vol 13 ◽  
Author(s):  
Donald R. Moore
Keyword(s):  
Larval Stage ◽  
Western Atlantic ◽  
Fossil Species ◽  
The Family ◽  
Planktonic Larval Stage

The enigmatic bivalve Planktomya henseni has masqueraded as a holoplanktonic animal for nearly a century. Allen and Scheltema (1972) showed that all the evidence pointed to a benthic clam with an unusually long planktonic larval stage. This benthic clam has finally been found in the tropical western Atlantic, and appears to be a member of the Family Sportellidae. Comparison with fossil species in this family shows a trend toward a large prodissoconch and apparently a long planktonic larval stage

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