摘要:

Eight nematode species of the order Monhysterida are described from the East Flower Garden at 72 m depth in the north–western Gulf of Mexico. The material is from sandy and rocky bottom samples influenced or beyond the influence o f a sulphide–rich brine seep. Seven species are new to science:Monhystera anoxybioticasp.n.,Gonionchus intermediussp.n.,Theristus (Theristus) coplatussp.n., Theristus (Theristus) rezaki sp.n.,Xyala oxybioticaspa.,Desmolaimoides thiobioticusgen. et sp.n. andLinhomoeus gittingsisp.n. Specimens of aLinhomoeusspecies are also described. The species is probably new to science, but the available material only includes females and juveni

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00203.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

The nuchal organs ofStygocapitella subterraneaare paired narrow pits. They are lined by unciliated cells at the opening and by ciliated cells at the basal parts. The primary sensory cells (6–8) are arranged in a single patch at the bottom of the nuchal pit. The nuclei of the sensory cells are located in the posterior portion of the brain. Their dendrites form the nuchal nerve which is sheathed by the ciliated cells. Each sensory cell bears up to 4 modified sensory cilia and several microvilli extending into the olfactory chamber. The sensory cilia show various patterns of axonemal organization and have no rootlets. The olfactory chamber is covered by a cuticular matrix. Another primary sensory cell lies at the opening of the nuchal pit. It bears cilia which penetrate the cuticle but are enveloped by the epicuticle. Retractor muscles insert caudally on the organ. The nuchal organ ofS. subterraneashows similarities to those of opheliids but exhibits several features not to be found in other nuchal organ

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00204.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Descriptions and diagnoses are given forLaminatubus alvinigen. et sp.n. andProric hydrothermicasp.n. Both species have been collected by submersibles (AlvinandCyana) in four areas with hydrothermal activity on the Galapagos Ridge and on the East Pacific Risc (approx. 1°N, 10°N. 13°N and 21°N), at depths of about 2500–2600 m. The microstructure of the tube walls has been analysed and is illustrated by SEM microg

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00205.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Vovelle, J.&Gaill, F. 1986. Données morphologiques, histochimiques et microanalytiques sur l'élaboration du tube organominéral d'Alvinella pompejana, Polychète des sources hydrothermales, et leurs implications Phylogénétiques. [Morphological, histochemical and microanalytical data on the elaboration of the organomineral tube ofAlvinella pompejana, a polychaete from hydrothermal vents, and its phylogenetic implications.]The material elaborated byAlvinellu pompejunaDesbruyères&Laubier, 1980, a polychaete worm from hydrothermal vents in the East Pacific, to build up its tube originates from an anterior ventral ‘glandular shield'. Mucocytes rich in sulphated glycosaminoglycan provide an accessory component, but the bulk is formed from homogeneous granules, secreted by the deep ‘main’ cells of this shield. The organic part of the granules, as demonstrated by histochemistry, is proteinaceous, while the mineral part, as proved by microanalysis, includes phosphorus, calcium, iron and in smaller amounts magnesium and zinc. The material of the tube shows an increase in the ratio iron‐calcium. Phosphorus may be bound to the organic part, but there is no sulphur present in it. In the laminated tube, scanning electron microscopy and microanalysis detect an enrichment in heterogeneous components of different constitution (balls and crystals). Silica, pointed out as characteristic of fossil worm tubes but absent in secretions, is not of endogenous origin. The original composition of theAlvinellatube can thus be related to that of other examples of the order Terebellida who live in a less drast

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00206.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

Six species of marine tubifieids are described from the continental shelf off Peru. Two of them are members of the gutless genusOlaviusErséus, 1984 (subfamily Phallodrilinae).Olavius bullatussp.n. possesses 2 pairs of large penial setae in voluminous copulatory sacs, tiny atria, and spermathecal pores in line with dorsal setae.Olavius crassitunicatussp.n. is characterized by small atria with thin muscular layer, spermathecae with short ducts, opening dorso‐laterally, and lack of penial setae. Four species arc members of the subfamily Limnodriloidinae.Limnodriloides busilicussp.n. belongs to theappendiculatus‐group (sensuErséus). It is discriminated by somatic setae with subdental ligaments, and its voluminous elongate prostatic pads.Limnodriloides clavellatussp.n. is distinguished from its congeners by a peculiar bulge in the cavity of each atrial ampulla, and spermatozeugmata imbedded in the walls of the spermathecae.Tectidrilus intermixtussp.n. is similar toT. bori(Righi&Kanner, 1979); it is distinguished from the latter by having trisetal bundles in segment V or V‐VI and by lacking copulatory glands.Marcusaedrilus peruanussp.n. is characterized by nongranulated atrial ducts and bipartite sperm

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00207.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

A new oligochaete family, Randiellidae, is established forR. multithecasp.n. (from the continental shelf off the east coast of the U.S.A.),R. litoralissp.n. (from Oregon, U.S.A.),R. caribaeasp.n. andR. minutasp.n. (both from Guadeloupe and Martinique), all members of a new marine genusRandiella.The species are characterized by small single‐pointed and somewhat sigmoid somatic setae, slender (generally hair‐like) modified genital setae in segment X, sperm funnels in X (if one pair), or in X and XI (if two pairs), very simple male ducts lacking atria, clitellum over XII‐XIII, and multiple spermathecae in VII and/or

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00208.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

A SEM study of the structure associated with the outlet of the epiphallus in the atrium genitale of three arionid species (Arion hortensis s.s., A. distinctusandA. owenii) is presented. The structures are described and compared, and the specific differences are outlined. Preliminary notes on the same structure inA. intermedius, as well as on the spermatophores ofA. hortensis s.s.andA. distinctus, are also provided. It is concluded thatA. oweniistands somewhat apart in relation to the latter two species, since it may be more related toA. intermedius.Although it is generally accepted that the genusArionis characterized by the absence of a penis, it is suggested here that the described structure at the outlet of the epiphallus is nothing but a remnant of an ancestral penis; anyhow, it is at least functionally allied to a penis.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00209.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

The fine structure of the somatic muscles and their attachment to the cuticle in the pyenogonidsNymphon (Chaetonymphon) macronyxG. O. Sars andBoreonymphoncf.abyssorum(Norman) is described. The muscles possess characteristics which are typical of arthropod slow muscle fibers: relatively long sarcomeres, a mean A‐band length of about 6 μm and a ratio of thin to thick contractile filaments of 4:1. The sarcotubular system consists of distinct t‐tubules, an irregular SR part and randomly distributed dyads and triads, the muscles are attached to the cuticle by specialized epidermal cells containing microtubules extending from the cuticular to the muscular side. The myoepidermal and epidermal‐cuticular junctions are des

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00210.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY

摘要:

A tiny arthropod, with five growth stages, is described. Three of the instars are metanauplius‐like larvae, having unsegmented bodies and four pairs of appendages. The largest stage, with a length of about 1.5 mm, may still be immature. Its body is divided into three tagmata. The cephalon, including five appendiculate segments, h a projecting forehead with a rostral spine and a small shield with a joint between fourth and fifth segments. Eyes are absent. The trunk is composed of seven annular segments, the anterior two with appendages. The caudal end is a long pleotelson‐like segment with the anus on its ventral surface. There are seven pairs of appendages: uniramous antennulae, composed of few tubular podomeres; four pairs of biramous postantennular, almost homeomorphic cephalic appendages; two pairs on the trunk, the anterior pair being similar to the cephalic appendages except for the exopodite, the posterior being much smaller, uniramous and apparently rudimentary.Martinssoniawas probably benthic, feeding on detritic particles which it stirred up from the bottom. Besides various crustacean‐like features, the new form reveals structures different from Crustacea as well as from all other known arthropodan groups.Martinssoniapresumably is a descendant of an euarthropodan group, originating from the crustacean branch long before reaching the eucrustacean level of evol

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1986.tb00211.x

出版商:Blackwell Publishing Ltd    

年代:1986

数据来源: WILEY