scholarly journals A clearly identifiable postlarva in the life cycle of a new species of Pliciloricus (Loricifera) from the deep sea of the Angola Basin

Zootaxa ◽  
2009 ◽  
Vol 2096 (1) ◽  
pp. 50-81 ◽  
Author(s):  
GUNNAR GAD
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Deep Sea ◽  
Type I ◽  
Double Row ◽  
Body Regions ◽  
New Information ◽  
Two Phases ◽  
Distinguishing Features ◽  
A New Species

A newly discovered species of Pliciloricus from the deep sea of the Angola Basin (Namibia, Atlantic) seems to have two types of postlarvae in its life cycle. Type I is a simplified but clearly identifiable postlarval stage, the other type II consists only of a thin layer of cuticle as the remnant of a postlarva. Both types contain adults that have moulted from them. The simplified type I postlarva has a fully developed lorica with an ornamentation identical to that of the adult, but other body regions are reduced with only a few structures left. The discovery of this clearly identifiable postlarva is important, because it supports the conclusion that Pliciloricus-species originally moults from postlarval stages as well as other taxa of Loricifera. Furthermore, it could be concluded that the simple cuticle layer surrounding most adults found during their metamorphosis is the remnant of a postlarval stage. The life cycle of the new species seems to include two phases. After to the bisexual is a unisexual phase, represented by a simplified parthenogenetic adult stage which lacks most parts of the adult morphology. The adults of P. diva sp. n. differ from other species in having among others (1) a mouth cone with four strong cuticular bars plus eight primary oral ridges; (2) leaf-like clavoscalids which are very broad basally and narrow distally, and have more than 22 transverse cross walls; (3) a strongly sclerotized double-organ consisting of four rami; (4) large spinoscalids of second row shorter than clavoscalids, (5) short type B spinoscalids of fourth row with claw-tips and with a double row of five teeth as well as distally with a double row of minute denticles; (6) an anterior margin of the lorica with bicuspid protrusions and specific crescent-shaped ornamentations; (7) a midventral plica with five bar-like transversal strengthened ridges. Distinguishing features of the Higgins-larva are (1) short clavoscalids with broad second segments; (3) a collar with seven flosculi located in small pits; posterolateral setae being short but strong and pod-like. The study also revealed new information about the double-organ of the adult and the buccal structures of the Higgins-larva.

A new slipper lobster of the genus Petrarctus Holthuis, 2002 (Crustacea, Decapoda, Scyllaridae) from Southwest coast of India

Zootaxa ◽  
2017 ◽  
Vol 4329 (5) ◽  
pp. 477 ◽  
Author(s):  
CHIEN-HUI YANG ◽  
APPUKUTTANNAIR BIJU KUMAR ◽  
TIN-YAM CHAN
Keyword(s):  
New Species ◽  
Deep Sea ◽  
Genetic Information ◽  
Anterior Part ◽  
Molecular Genetic ◽  
Taxonomic Status ◽  
Molecular Genetic Analysis ◽  
Andaman Sea ◽  
Abdominal Somite ◽  
A New Species

A new species of slipper lobster of the genus Petrarctus Holthuis, 2002 was discovered from southwestern India during a survey of deep sea crustaceans. The new species closely resembles P. veliger Holthuis, 2002 from the Andaman Sea and western Pacific but differs mainly in the color marking on abdominal somite I, having a relatively lower cardiac tooth but with better developed tubercles on the abdomen, as well as a differently shaped anterior part of the thoracic sternum. Molecular genetic analysis also confirms the distinct taxonomic status of the new species. To fix the identity of the type species of the genus, a neotype of P. rugosus (H. Milne Edwards, 1837) was selected from a recently collected Indian specimen with color and genetic information. 

scholarly journals Nausithoe aurea n. sp. (Scyphozoa: Coronatae: Nausithoidae), a species with two pathways of reproduction after strobilation: sexual and asexual

1997 ◽  
Vol 66 (4) ◽  
pp. 235-246 ◽  
Author(s):  
Fábio Lang da Silveira ◽  
André Carrara Morandini
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Embryonic Development ◽  
Yellow Pigment ◽  
Early Embryonic Development ◽  
Paulo State ◽  
Polyp Stage ◽  
Submarine Cave ◽  
A New Species ◽  
Medusa Stage

Nausithoe aurea, a new species of scyphozoan Coronatae, is described from São Paulo State, Brazil. The solitary scyphistomae, with some zooxanthellae, strobilated producing planuloids and medusae; this represents an intermediate life cycle between that of metagenetic Nausithoidae and the submarine cave-dwelling, reduced medusa stage of Nausithoe planulophora (Werner, 1971). The periderm tube of the scyphistomae has 16 internal cusps in all whorls. The medusae present yellow pigment spots in most of their lappets. The early embryonic development is briefly described. Planuloid formation is hypothesized as explanation for polyp-stage philopatry.

Morphology and life cycle of a new species ofDidymium(Myxomycetes) from arid areas of Mexico

Mycologia ◽  
2008 ◽  
Vol 100 (6) ◽  
pp. 921-929 ◽  
Author(s):  
D. Wrigley de Basanta ◽  
C. Lado ◽  
A. Estrada-Torres
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Arid Areas ◽  
A New Species

scholarly journals Ashinkailepas kermadecensis, a new species of deep-sea scalpelliform barnacle (Thoracica: Eolepadidae) from the Kermadec Islands, southwest Pacific

Zootaxa ◽  
2009 ◽  
Vol 2021 (1) ◽  
pp. 57-65 ◽  
Author(s):  
JOHN S. BUCKERIDGE
Keyword(s):  
New Species ◽  
New Zealand ◽  
Deep Sea ◽  
Cold Water ◽  
The Other ◽  
Cold Seeps ◽  
Central Japan ◽  
Southwest Pacific ◽  
The North ◽  
A New Species

A new deep-sea stalked barnacle, Ashinkailepas kermadecensis sp. nov. has been recovered from a cold-water seep at depths of 1165 metres in the vicinity of the Kermadec Ridge to the northeast of the North Island, New Zealand. There are now two species of Ashinkailepas—the other, Ashinkailepas seepiophila Yamaguchi, Newman & Hashimoto, 2004, occurs in deep, cold seeps off central Japan. As there are two species within Ashinkailepas, formal diagnoses are provided for both taxa.

A new small-celled diatom from Brazil - Luticola minutissima sp. nov., with comparison to the type of the Antarctic L. neglecta Zidarova, Levkov & Van de Vijv

Phytotaxa ◽  
2022 ◽  
Vol 530 (3) ◽  
pp. 287-294
Author(s):  
MATEUSZ RYBAK ◽  
ŁUKASZ PESZEK ◽  
ŁUKASZ SKOCZYLAS ◽  
THELMA ALVIM VEIGA LUDWIG
Keyword(s):  
New Species ◽  
Palm Tree ◽  
Similar Species ◽  
Concrete Walls ◽  
New Information ◽  
Eastern Brazil ◽  
The Antarctic ◽  
The City ◽  
A New Species ◽  
Small Valve

The samples for this study were collected from terrestrial mosses and lichens growing on palm tree trunks and concrete walls in the city of Rio de Janeiro, south-eastern Brazil. During the investigation on diatom diversity, a new species from the genus Luticola was found. The new species occurred individually at all sampling sites. The aim of this paper is to provide a morphological and ecological description of Luticola minutissima sp. nov. from an aerophytic environment. The species is characterized by a small valve size (5.2–16.8 μm length and 3.7–4.4 wide) and abruptly hooked proximal raphe endings (ca. 90-degree angle). Additionally for comparison, type material of the most similar species, Luticola neglecta Zidarova, Levkov & Van de Vijver, was studied and new information for the ultrastructure of the latter species is provided as well.

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