摘要:

Among mites the ancestral ecdysial cleavage line, or line of dehiscence (a), is inferred by outgroup comparison to be prodehiscent: U‐shaped, passing around the front of the mite just above the insertions of the appendages, such that the mite ecloses anteriorly. From preserved and living individuals and exuviae, we found prodehiscence (or its slight variations) to be widespread in Acariformes. It appears to be pervasive in endeostigmatic mites, eupodine Prostigmata, and basal taxa in the Oribatida (Enarthronota, Palaeosomata); it is dominant in cleutherengone Prostigmata and is present in at least one anystine family (Caeculidae).Three general modes of dehiscence are considered to be derived within acariform mites. (1)Merodehiscenceis a transverse splitting of the dorsal cuticle at or near the juncture of proterosoma and hysterosoma; it evolved separately in thrcc groups of Prostigmata (Tetranychidae, an undefined subgroup within Cheylctidae, and active instars of Parasitengona) and in a genus of Astigmata (Histiogaster). (2)Trarnsdehiscenceis a transverse splitting of the dorsal hysterosomal cuticle anterior to the opisthosomal glands; it occurs in middle‐derivative oribatid mites (the paraphyletic Desmonomata), and new observations show it to be widespread in Astigmata, lending support to the hypothesis that the latter group evolved from within Desmonomata. (3)Circumdehiscenceis a circumferential splitting of the hysterosomal cuticle that may be incomplete anteriorly; it has long been known to characterize the monophyletic oribatid taxon Brachypylina, but it is convergent with a similar dehiscence in an unrelated family, Lohmanniidae. Transdehiscent and circumdehiscent mites eclose posteriorly.Astigmata exhibit the greatest variety of modes of dehiscence, including the three derived modes and a probable reversal to prodehiscence in Algophagidae. Furthermore, heteromorphic deutonymphs (hypopi) may ecdyse differently from other immature instars of the same spec

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1994.tb00383.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Three sphaerodorid species new to science are described from a manganese nodule area in abyssal depths of around 4150 m in the Peru Basin in the eastern South Pacific.Sphaerodoridium campanulatasp. n. is isolated within the genus, having, apart from spherical macrotubercles, additional dorsal stalked bell‐shaped papillae, not previously described.Sphaerodoropsis discolissp. n. is a species with four rows of dorsal macrotubercles and two pairs of lateral antennae.Sphaerodoropsis translucidasp. n. has six to seven rows of dorsal macrotubercles arrayed in two transverse rows per segment and two pairs of lateral antennae. A brief discussion points to the close relationship betweenClavodorumandSphaerodoridium, and to the present state ofSphaerodoropsis, being inhomogeneous in the characters of the arrangement of the dorsal macrotubercles and the numbers of the lateral antennae. An overview on the latter genus, with an attempt to subdivide it, is give

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1994.tb00384.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Two new species of harpacticoid copepods of the family Ancorabolidae are described from a subtidal site in Cape Armitage, McMurdo Sound, Antarctica.Laophontodes macclintockisp. n. andL. spongiosussp. n. are easily distinguished from the remaining members of the genusLaophontodesby the setal formula of swimming legs P2–P

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1994.tb00385.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Five species of Tubificidae are recorded from Antarctic waters:Torodrilus lowryiCook, 1970,Torodrilussp. (subfamily Rhyacodrilinae),Marionidrilus antarcticussp. n.,M. weddellensissp. n., andThalassodrilus bickisp. n. (subfamily Phallodrilinae); onlyT. lowryiwas known from Antarctica before. The status of the two Southern Hemisphere generaTorodrilusCook, 1970, andMarionidrilusErséus, 1992, are discussed; although the taxonomic position of the two new species ofMarionidrilusis somewhat uncertain.Thalassodrilus bicki, however, appears closely related to Northern Hemisphere taxa

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1994.tb00386.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Seven species assigned to the genusCribrilinaare illustrated by scanning electron microscopy (SEM) and redescribed. At the present day, three species occur in the area studied:C. punctata(Hassall),C. cryptooeciumNorman andC. annulata(Fabricius). The presence ofCollarina balzaci(Audouin), which has previously been confused withCribrilina punctata, is also reported. The following species ofCribrilinaare known as Pliocene and Pleistocene fossils:C. punctata, C. cryptooecium, C. watersiAndersson,C. puncturata(Wood) andC. mucronataCanu&Lecointre. In addition,C. annulataand C.spitsbergensisNorman have been reported as fossils, but these occurrences could not be confirmed here by the examination of actual material. Lectotypes are selected forC. spitsbergensis, C. watersi, C. puncturataandC. mucronata.Type material of the American fossilC. marylandica, which has been synonymised withC. punctata, is illustrated.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1994.tb00387.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Colony morphology, life history, and the resulting concepts of generic inter‐relationships within the family Cupuladriidae are discussed. The characters of the genusCupuladria, and of theC. canariensiscomplex of species from the Tertiary to Recent of Europe, West Africa and the Central American regions, are described and illustrated.Cupuladria remotasp. n., a close relative of the Recent Brazilian species,C. monotrema, is described from the mid‐Pacific Marquesas Islands. The origin of this isolated population, and its possible distributional history, are discus

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1994.tb00388.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY

摘要:

Books review in this article:Where are we and where are we going in the study of meiofauna?Meiobenthology. The Miczoscopic Fauna in Aquatic Environments–Olav Gie

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1994.tb00389.x

出版商:Blackwell Publishing Ltd    

年代:1994

数据来源: WILEY