Figure 3 - uploaded by T. Subramoniam
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(A), (B) and (C) are mate guarding positions of males and females, left side mating and right side mating, respectively. (B1) and (C1) are the photographic presentation of (B) and (C), respectively.
Source publication
Precopulatory mate guarding is a characteristic feature in the mating behaviour of many Malacostraca, and a necessary prerequisite for those species in which female receptivity for males is restricted to a short period of time after the pubertal/reproductive moult. This study deals with the pre-mate guarding behaviour of the semi-terrestrial isopod...
Contexts in source publication
Context 1
... mating, the male engaged the female with the help of the 5th, 6th and 7th pereopods and helped to remove the posterior portion of the exoskeleton during moulting (Figure 3(A)). After successful removal, the male lifted and turned the female with the help of the 5th, 6th and 7th pereopods to an oblique position, while the remaining 1-4 pereopods were still clinging to the cephalothorax region of the female. ...
Context 2
... copulation, the posterior pereon somites and pleon somites were bent towards the latero- ventral portion of the female. During this process, the rhythmic movement of the male's posterior segments was observed towards the left (Figure 3(B) and (B1)) and right (Figure 3(C) and (C1)) latero-ventral sides of the female. ...
Context 3
... copulation, the posterior pereon somites and pleon somites were bent towards the latero- ventral portion of the female. During this process, the rhythmic movement of the male's posterior segments was observed towards the left (Figure 3(B) and (B1)) and right (Figure 3(C) and (C1)) latero-ventral sides of the female. ...
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Citations
... Females first molt the posterior body half, copulate, and then molt the anterior body half. In the marine isopod Ligia dentipes, the guarding male assists the female in removing her old exoskeleton during ecdysis (Santhanakumar et al. 2014). Once the posterior body of the female is molted, copulation takes place. ...
... Males then immediately start searching for new mates. Postcopulatory mate guarding is not oberserved in this species (Santhanakumar et al. 2014), it is generally rare and if present, only lasts briefly among isopods (A in Fig. 12.1). ...
In polyandrous mating systems, females mate multiple times and males have evolved adaptations for sperm competition which increase the number and fitness of their offspring. Mate guarding is a widespread monopolization strategy in groups where female receptivity is temporally restricted and often associated with the molt. Precopulatory guarding occurs in branchipods, copepods, peracarids and decapods. Postcopulatory guarding is notable in numerous brachyurans with males protecting females until her exoskeleton has hardened. During copulation, male success in fertilization depends on an effective sperm transfer mechanism, the precise placement of ejaculates closest to where female gametes are fertilized. Male copulatory systems are highly diverse and strongly adapted to these tasks, especially the structures that interact with the female genital ducts. The elaborate tips of brachyuran gonopods are supposed to act in the displacement, possibly even in the removal of rival sperm masses; however, sperm removal is only evident in crayfish: males eat spermatophores previously deposited by other males. During copulation of several crustacean groups, males transfer secretions that harden and form a sealant. These sperm plugs, plaques and gel layers may protect their own sperm, prevent remating or seal off rival sperm from the site of fertilization. Several groups of isopods and decapods have internal insemination, elaborate sperm storage organs and some exhibit internal fertilization. The intensity of sperm competition increases with the latency between the processes of insemination and fertilization. This chapter gives on overview on mate guarding, male sealants and the anatomical adaptations to sperm competition in crustaceans. We also briefly discuss the consequences of multiple matings for the genetic diversity of broods, i.e., single vs. multiple paternities. There is still a lack of data for many crustacean groups. Moreover, it is often hard to assess how successful a male strategy to ensure paternity actually is as many studies focus on either the behavioral, anatomical, or molecular aspects, while comprehensive multi-level studies on crustacean sperm competition are virtually absent from the literature.-Not for reuse or distribution
... Isopods are known for their mate guarding behaviour, which becomes crucial with the advent of biphasic molting and the restricted female receptivity period 26 . Precopulatory guarding and copulation may be followed by postcopulatory guarding, as in Thermosphaeroma baltica and T. thermophilum 27 . ...
Life history traits such as direct development and restricted dispersal, ecological specialization to live in the host sponge, defending the valuable host resource, as well as selective breeding by one or more queens contribute to the evolution of eusociality in marine Crustacea, in particular, the synalpheid shrimp. This review critically examines the preconditions necessary for the evolution of complex social behaviours and structures including eusociality in these symbiotic shrimps and other crustacean species. © 2017, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.
... This species has a wide distribution in the Indian Ocean. It was previously known from the Nicobar Islands (Budde-Lund 1885) and the Andaman Islands Santhanakumar et al. 2014). Besides the Maldives, it occurs also on Sri Lanka (1 F, 1 C, Koggala, Habaraduwa Beach, 20.XII.1980, ...
Twenty-seven species of terrestrial isopods are recorded from the Maldive Islands (North Kaafu Atoll and Vaavu Atoll). One genus (Eubelinum) in the family Eubelidae and three species (Styloniscus maldivensis, Eubelinum incertum, and Pseudodiploexochus indicus) are described as new, and 26 species are newly recorded from the archipelago. Ligia dentipes Budde-Lund, 1885 is also recorded from Sri Lanka and Seychelles. The poorly known species Tylos albidus Budde-Lund, 1885 and Platyarthrus acropyga Chopra, 1924 are also illustrated. The composition and origin of the oniscidean fauna of the Maldives are briefly discussed.http://zoobank.org/urn:lsid:zoobank.org:pub:ABD0E6EA-83FE-4F61-8B81-D3C8A0B23848
