Seasonality of Monstrilla Helgolandica Claus, 1863 (Copepoda, Monstrilloida) and the Occurrences of Other Monstrillids in Maine

McAlice, B. J.; Jaeger, G.

doi:10.2307/1548110

Cited by 6 publications

(5 citation statements)

References 7 publications

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“…B 281: 20140739 to the female rather than adult mortality. Through most of the life of Monstrilloida (other than first nauplii and adults), the larvae are an internal parasite of benthic organisms [22,49]. We have no evidence of difference in risks between the males and females of Monstrilloida and their SDI values are intermediate between the two other parasitic families included here (see also [12,50]).…”

Section: (I) Free-living Copepodsmentioning

confidence: 65%

“…Males may attach to young immature females at the second copepodite stage [21] and complete development on the female, remaining attached until death. The Monstrillidae (order Monstrilloida) are poorly described biologically and ecologically, but are parasites of marine benthic invertebrates, especially on polychaetes and gastropods [22]. In Monstrilloida, only the first nauplius and adult stages are free-swimming; the other larval stages are highly modified internal parasites.…”

Section: Materials and Methods (A) Copepod Datamentioning

confidence: 99%

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Macroevolutionary patterns of sexual size dimorphism in copepods

Hirst

Kiørboe

2014

Proc. R. Soc. B.

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Major theories compete to explain the macroevolutionary trends observed in sexual size dimorphism (SSD) in animals. Quantitative genetic theory suggests that the sex under historically stronger directional selection will exhibit greater interspecific variance in size, with covariation between allometric slopes (male to female size) and the strength of SSD across clades. Rensch's rule (RR) also suggests a correlation, but one in which males are always the more size variant sex. Examining free-living pelagic and parasitic Copepoda, we test these competing predictions. Females are commonly the larger sex in copepod species. Comparing clades that vary by four orders of magnitude in their degree of dimorphism, we show that isometry is widespread. As such we find no support for either RR or for covariation between allometry and SSD. Our results suggest that selection on both sexes has been equally important. We next test the prediction that variation in the degree of SSD is related to the adult sex ratio. As males become relatively less abundant, it has been hypothesized that this will lead to a reduction in both inter-male competition and male size. However, the lack of such a correlation across diverse free-living pelagic families of copepods provides no support for this hypothesis. By comparison, in sea lice of the family Caligidae, there is some qualitative support of the hypothesis, males may suffer elevated mortality when they leave the host and rove for sedentary females, and their femalebiased SSD is greater than in many free-living families. However, other parasitic copepods which do not appear to have obvious differences in sex-based mate searching risks also show similar or even more extreme SSD, therefore suggesting other factors can drive the observed extremes.

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Section: (I) Free-living Copepodsmentioning

confidence: 65%

Section: Materials and Methods (A) Copepod Datamentioning

confidence: 99%

Macroevolutionary patterns of sexual size dimorphism in copepods

Hirst

Kiørboe

2014

Proc. R. Soc. B.

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“…Monstrilloids have nonfeeding, reproductive, and free-swimming adults that lack appendages between 514 ADEL ALI A. MAGEED the antennules and swimming legs (Grygier & Ohtsuka, 2008). The adult, nonfeeding stage is indeed free-living (Hartman, 1961;McAlice & Jaeger, 1982;Huys & Boxshall, 1991;Grygier & Ohtsuka, 2008).…”

Section: Introductionmentioning

confidence: 99%

Cymbasoma janetae n. sp., a new monstrilloid (Copepoda, Monstrilloida) from the Gulf of Aqaba (Red Sea, Egypt)

Mageed¹

2010

Crustac

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“…Species of Monstrilla with pectinate antennules in the male have been known to occur mainly from the northern hemisphere, including Maine and Alaska, in the United States, Canada, northern France, England, and Norway, but also from tropical areas (Gilbert Islands, Mindanao, and North Africa) (McAlice and Jaeger, 1982;McAlice, 1985). Monstrilla pygmaea is known only from the Mediterranean (Suárez-Morales, 2000).…”

mentioning

confidence: 99%

Monstrilloida (Crustacea: Copepoda) from the Beagle Channel, South America

Suárez‐Morales

Ramírez

Derisio

2008

Contributions to Zoology

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Monstrilloid copepods were collected during zooplankton surveys in the Beagle Channel at the southernmost end of South America. These specimens represent two species of Monstrillopsis, one of them undescribed, and one new species of Monstrilla. Monstrillopsis igniterra n. sp. is related to forms of the M. dubia species group, and particularly to M. ferrarii and M. chilensis. It differs from these species in the relative length of the antennules, the shape and relative size of the genital double and anal somites, details of the antennular armature, and the possession of a short inner caudal seta. The other species of Monstrillopsis, M. chilensis, was previously known only from the Southeast Pacific off Chile, and was originally described from female specimens only. Male individuals found in the Beagle Channel are described and assigned herein to this species. These are the first records of Monstrillopsis from high latitudes of South America. The new species Monstrilla patagonica n.sp. is represented by males. It is characterized by the structure and relative size of the genital lappets, details of the antennular structure, armature, relative size and the number (6) of caudal setae. It belongs to a small group of species with highly modified, pectinate male antennules. A female specimen identified as M. helgolandica 35 years ago from southern Argentina is tentatively reidentified as the female of this new species, based on its differences from M. helgolandica and the rarity of this species group in the region.

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Seasonality of Monstrilla Helgolandica Claus, 1863 (Copepoda, Monstrilloida) and the Occurrences of Other Monstrillids in Maine

Cited by 6 publications

References 7 publications

Macroevolutionary patterns of sexual size dimorphism in copepods

Macroevolutionary patterns of sexual size dimorphism in copepods

Cymbasoma janetae n. sp., a new monstrilloid (Copepoda, Monstrilloida) from the Gulf of Aqaba (Red Sea, Egypt)

Monstrilloida (Crustacea: Copepoda) from the Beagle Channel, South America

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