Ovary structure and early oogenesis in the remipede, Godzilliognomus frondosus (Crustacea, Remipedia): phylogenetic implications

Kubrakiewicz, Janusz; Jaglarz, Mariusz K.; Iliffe, Thomas M.; Biliński, S; Koenemann, Stefan

doi:10.1016/j.zool.2012.01.001

Cited by 19 publications

(6 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…3). Apomorphies for a clade of remipedes and hexapods (Miracrustacea in partim) are in part influenced by character states in their fossil sister groups (Tanzazios and euthycarcinoids), such as the apparent presence of an intercalary segment in Tanazios 30 versus a second antenna in extant remipedes, whereas others are sourced from internal anatomy of extant taxa 31 . Apomorphies of a remipede-hexapod clade are instead resolved as symplesiomorphic for Tetraconata in the extant-only data set (DS-II) because of their shared presence in myriapods.…”

Section: Resultsmentioning

confidence: 99%

Arthropod fossil data increase congruence of morphological and molecular phylogenies

2013

View full text Add to dashboard Cite

The relationships of major arthropod clades have long been contentious, but refinements in molecular phylogenetics underpin an emerging consensus. Nevertheless, molecular phylogenies have recovered topologies that morphological phylogenies have not, including the placement of hexapods within a paraphyletic Crustacea, and an alliance between myriapods and chelicerates. Here we show enhanced congruence between molecular and morphological phylogenies based on 753 morphological characters for 309 fossil and Recent panarthropods. We resolve hexapods within Crustacea, with remipedes as their closest extant relatives, and show that the traditionally close relationship between myriapods and hexapods is an artefact of convergent character acquisition during terrestrialisation. The inclusion of fossil morphology mitigates long-branch artefacts as exemplified by pycnogonids: when fossils are included, they resolve with euchelicerates rather than as a sister taxon to all other euarthropods.

show abstract

Section: Resultsmentioning

confidence: 99%

Arthropod fossil data increase congruence of morphological and molecular phylogenies

2013

View full text Add to dashboard Cite

show abstract

“…The crustacean ovaries may be composed of branched ovarioles (Fyhn and Costlow, 1977). Sometimes, the ovary lobes are fused anteriorly, as in the peracarids (Alikhan, 1968) and other lower Crustaceans (Kubrakiewicz et al, 2012), medially, as in the macrurans (Vazquez et al, 2008) and anomuran species (Sokolowicz et al, 2007) and isopods (Shuster, 1991), and posteriorly as in the stomatopods (Wortham-Neal, 2002) and other decapods (Ando and Makioka, 1998). Crustacean ovaries vary in shape (Munuswamy and Subramoniam, 1985) and location but appear usually in pair.…”

Section: Discussionmentioning

confidence: 99%

Histological and ultrastructural investigation of the female reproductive system of Argulus bengalensisRamakrishna, 1951 (Crustacea: Branchiura)

Banerjee

Saha

2016

Journal of Morphology

View full text Add to dashboard Cite

In order to understand branchiuran reproductive biology, it is imperative to know the sites of oogenesis and oocyte maturation, locate the accessory reproductive glands, and identify the fertilization site with the present knowledge of the sperm transfer mechanism of the genus Argulus. With these objectives, we attempted to describe the female reproductive system of Argulus bengalensis using serial histological sections through the ovaries and associated ducts in the transverse, longitudinal, and sagittal planes. The reproductive organs include a median ovary, one pair of ovarian lumina, a median oviduct, and a pair of collateral accessory glands. A duct from each of the collateral accessory glands leads into the proximal part of the median oviduct, which opens to the exterior through a genital opening at the distal end. The glandular secretion presumably contributes to the jelly coat of the egg. The ovary is bound with a tunica propria which extends further diametrically inside the ovary forming the paired lumina. The lumina are confluent into the median oviduct. Two distinct areas, the germarium and differentiating zones, are clearly distinguishable within the ovary. The tunica propria itself houses the oogonia within a matrix, serving as the germarium. Transmission electron micrograph reveals that the matrix is made of collagen. The collagen matrix confers elasticity to the tunica propria to accommodate the postvitellogenic oocytes within the ovarian lumen. The differentiating zone is situated in between the germarium: dorsally it is covered with a chromatophore layer. The ovary is ensheathed by a circum ovarian striated muscle. The presence of spermatophores in the ovarian lumen indicates the fertilization site.

show abstract

“…8.1I) within the Decapoda (see below). In other non-malacostracan orders, populations comprising entirely hermaphrodites have been reported in the Cephalocarida (Addis et al 2012), in the cave-dwelling Remipedia (Neiber et al 2011, Kubrakiewicz et al 2012, in some spinicaudatan branchiopods (Scanabissi and Mondini 2002, Brantner et al 2013a, in notostracans (Macdonald et al 2011) and in the Cirripedia (Thoracica; Charnov 1987, Kelly and Sanford 2010Fig. 8.1J).…”

Section: <4> Simultaneous or Synchronous Hermaphroditismmentioning

confidence: 99%

Hermaphroditism and Gonochorism

Benvenuto¹,

Weeks²

2020

Reproductive Biology

View full text Add to dashboard Cite

This chapter compares two sexual systems: hermaphroditism (each individual can produce gametes of either sex) and gonochorism (each individual produces gametes of only one of the two distinct sexes) in crustaceans. These two main sexual systems contain a variety of alternative modes of reproduction, which are of great interest from applied and theoretical perspectives. The chapter focuses on the description, prevalence, analysis, and interpretation of these sexual systems, centering on their evolutionary transitions. The ecological correlates of each reproductive system are also explored. In particular, the prevalence of “unusual” (non-gonochoristic) reproductive strategies has been identified under low population densities and in unpredictable/unstable environments, often linked to specific habitats or lifestyles (such as parasitism) and in colonizing species. Finally, population-level consequences of some sexual systems are considered, especially in terms of sex ratios. The chapter aims to provide a broad and extensive overview of the evolution, adaptation, ecological constraints, and implications of the various reproductive modes in this extraordinarily successful group of organisms.

show abstract

Ovary structure and early oogenesis in the remipede, Godzilliognomus frondosus (Crustacea, Remipedia): phylogenetic implications

Cited by 19 publications

References 61 publications

Arthropod fossil data increase congruence of morphological and molecular phylogenies

Arthropod fossil data increase congruence of morphological and molecular phylogenies

Histological and ultrastructural investigation of the female reproductive system of Argulus bengalensisRamakrishna, 1951 (Crustacea: Branchiura)

Hermaphroditism and Gonochorism

Contact Info

Product

Resources

About