Invertebrate Zoology最新文献_第8页

First record of the freshwater bryozoan Pectinatella magnifica in north-west Russia with a description of sensory structures 俄罗斯西北部淡水苔藓虫的首个记录及其感官结构的描述

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.09

Z. I. Starunova, K. Shunkina, E. Genelt-Yanovsky, A. Kucheryavyy, N. Polyakova, Y. A. Danilova, T. A. Ivanova, V. Starunov, O. Zaitseva

引用次数: 0

Spermatozoa in the Demanian system of free-living marine nematode Admirandus multicavus (Enoplida: Oncholaimidae) 自由生活海洋线虫多腔海鞘(单足纲:胆线虫科)的精子

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.10

V. Yushin, L. A. Gliznutsa

{"title":"Spermatozoa in the Demanian system of free-living marine nematode Admirandus multicavus (Enoplida: Oncholaimidae)","authors":"V. Yushin, L. A. Gliznutsa","doi":"10.15298/invertzool.18.3.10","DOIUrl":"https://doi.org/10.15298/invertzool.18.3.10","url":null,"abstract":": The process of insemination and fertilization in the nematode family Oncholaimidae is of interest because females of many species have extremely unusual sperm storage organ called “Demanian system”. The mature spermatozoa from the main duct of the Demanian system of the free-living marine nematode Admirandus multicavus (Enoplida: Oncholaimidae) were studied by the transmission electron microscopy. The main duct is an epithelial tube with thick basal lamina. The dilated part of the duct is occupied by cluster of densely packed spermatozoa 7–8 µm in size, while the narrow part contains occasional strongly elongated sperm cells. The centre of spermatozoa is occupied by a nucleus with poorly condensed chromatin surrounded by a distinct nuclear envelope, the presence of which confirms isolation of enoplids from all other clades of nematodes. The prevalent components of sperm cytoplasm are ‘membranous organelles’ (MO) which resemble strongly elongated thread-like osmiophilic cisternae densely packed into bundles. Small numerous mitochondria are interspersed between bundles of MOs. Spermatozoa form pseudopods that reflect putative amoeboid cell motility. Amorphous nucleus, thread-like MOs, and numerous minute mitochondria are likely to represent preadaptation to squeezing through the narrow tubular communications of the Demanian system. Present observations of A. multicavus support basic characters of the oncholaimid sperm pattern previously described in another oncholaimid","PeriodicalId":37977,"journal":{"name":"Invertebrate Zoology","volume":"44 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76328017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ciliary bands in the prostomium region of Dimorphilus gyrociliatus (Annelida: Dinophiliformia) and their involvement in food uptake 回旋蝶口区纤毛带及其与食物摄取的关系

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.03

E. Fofanova, E. Voronezhskaya

{"title":"Ciliary bands in the prostomium region of Dimorphilus gyrociliatus (Annelida: Dinophiliformia) and their involvement in food uptake","authors":"E. Fofanova, E. Voronezhskaya","doi":"10.15298/invertzool.18.3.03","DOIUrl":"https://doi.org/10.15298/invertzool.18.3.03","url":null,"abstract":": A prototroch is a characteristic larval idiosyncratic structure conserved among Lophotrochozoa. It appears as the first prominent structure during embryogenesis, serves for swimming and filter-feeding, then degenerates or is modified after metamorpho-sis. Using cutting-edge confocal laser scanning microscopy, we investigated the detailed structure of the Dimorphilus gyrociliatus prototroch area and demonstrated that it is much more complex than previously thought. The first row of ciliated cells differentiates at the trochophore stage. By juvenile stage, three rows of ciliated cells are located in the prostomium region: an anterior row of cells with long (14–16 µm) cilia, an intermediate row of cells with short (3–4 µm) cilia, and a posterior row of cells with cilia of middle length (9– 10 µm). Each ciliated row consists of two bands of cilia-bearing cells. We suggest that the anterior row represents what is commonly considered a prototroch. At the same time, the intermediate row is considered homologous to the adoral ciliary zone, and the posterior row is considered homologous to the metatroch. Older individuals retain this ciliated apparatus until the last days of their life. With age, cilia in prototroch and metatroch become twice shorter; and the prototroch gets wider, at the end consisting of four lines of ciliated cells. inhibition of muscle contraction, the freshly hatched juveniles maintain the ability to uptake food particles. These findings confirm earlier observations showing that D. gyrociliatus uses its complex ciliated apparatus in the prostomial region for filter-feeding in addition to bulbus-scrabbing. Thus, we clarified the organization of the ciliary bands of D. gyrociliatus located in the prostomial region, documented their persistence during ontogenesis, as well as confirmed the participation of the ciliary apparatus in active food intake. These data support the paedomorphic character demonstrated for Dimorphilus gyrociliatus .","PeriodicalId":37977,"journal":{"name":"Invertebrate Zoology","volume":"142 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72419890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Paraedwardsia malakhovi, a new burrowing sea anemone (Actiniaria: Edwardsiidae) from Kamchatka and Kuril Islands 堪察加和千岛群岛的一种新穴居海葵

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.07

N. Sanamyan, K. Sanamyan

引用次数: 1

Young but distinct: description of Eubranchus malakhovi sp.n. a new, recently diverged nudibranch species (Gastropoda: Heterobranchia) from the Sea of Japan 年轻但不同的:malakhovi Eubranchus sp.n.的描述。来自日本海的一种新近分化的裸鳃新种(腹足目:异鳃目)

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.02

I. Ekimova, A. Mikhlina, O. Vorobyeva, T. Antokhina, V. Tambovtseva

引用次数: 9

An updated classification of the phylum Nemertea 一种更新的内梅门分类

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.01

A. V. Chernyshev

引用次数: 10

New data on the development of the brachiopod Hemithiris psittacea (Rhynchonelliformea: Rhynchonellida) 腕足动物psittacea的发育新资料(喙足目:喙足目)

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.06

T. Kuzmina

{"title":"New data on the development of the brachiopod Hemithiris psittacea (Rhynchonelliformea: Rhynchonellida)","authors":"T. Kuzmina","doi":"10.15298/invertzool.18.3.06","DOIUrl":"https://doi.org/10.15298/invertzool.18.3.06","url":null,"abstract":": Brachiopods are marine invertebrates with a pelago-benthic life cycle. The life cycle and structure of planktonic stages vary among brachiopod taxa. Many rhynchonelliform brachiopods, including those in the order Rhynchonellida, brood three-lobed larvae (i.e., the cephalulae) in the mantle cavity. However, no cephalulae were found in the mantle cavity of the rhynchonellid Hemithiris psittacea (Gmelin, 1791) from the White Sea. In this research, artificial insemination and induced spawning were used to study the ontogeny of H. psittacea from the White Sea Biological Station of Moscow State University (Kandalak-shskii Bay of the White Sea). After fertilization, a thick egg envelope forms around the zygote and adheres to the substrate. Cleavage, gastrulation, and formation of the three-lobed cephalula occur within the egg envelope. A worm-like competent cephalula hatches from the egg envelope and swims along the substrate rather than in the water column. The cephalula of H. psittacea differs in structure from the terebratulid larva, which actively swims in the water column. In contrast to terebratulid larva, the cephalula of H. psittacea lacks the eyespots and has shorter and less abundant setae. Development of H. psittacea from the White Sea proceeds in the external environment rather in the lophophore of the female. These results are inconsistent with the published data on H. psittacea from the San Juan Channel (Washington, USA), whose larvae develop outside the egg envelope in the lophophore of the female. A possible explanation is that Hemithiris from the San Juan Channel and from the White Sea represent separate species. The current report for H. psittacea from the White Sea is the first to describe embryonization of larval development for a rhynchonelliform.","PeriodicalId":37977,"journal":{"name":"Invertebrate Zoology","volume":"153 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75691383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dopamine-like immunoreactivity in sponge larvae 海绵幼虫多巴胺样免疫反应性

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.08

A. Sokolova, E. Voronezhskaya

引用次数: 0

Bosmina longirostris (O.F. Müller, 1785) (Anomopoda: Cladocera) in Australia: a new case of the anthropogenic introduction of a boreal waterflea 澳大利亚长水蚤(O.F. m<s:1> ller, 1785)(节肢纲:枝角目):一种北方水蚤人为引进的新病例

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.04

P. G. Garibian, Alexey A. Kotov

引用次数: 1

Euxinian relict amphipods of the Eastern Paratethys in the subterranean fauna of coastal habitats of the Northern Black Sea region 黑海北部沿海地区地下动物群中东傍提亚目欧西世残遗片足类

Invertebrate Zoology Pub Date : 2021-09-01 DOI: 10.15298/invertzool.18.3.05

I. Marin, S. Krylenko, D. Palatov

引用次数: 6