First Records of Tegastes Falcatus (Norman, 1868) and T Nanus Sars, 1904 (Copepoda: Harpacticoida) from the East Coast of the United States and a Redescription of T. Nanus

McAlice, B. J.; Coffin, Wendy L.

doi:10.2307/1548414

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Laptev Sea, east coast of the United States, the Hudson Bay, and the coast of Greenland (see Sars 1904, Wilson 1936, Chislenko 1967, 1977McAlice & Coffin 1990). However, specimens reported from the Mediterranean and around Sri Lanka (Ceylon before 1972) require additional study.…”

Section: Maxilla (mentioning

confidence: 99%

Copepodid development of Tegastes falcatus (Norman, 1868) (Copepoda, Harpacticoida, Tegastidae) with a discussion of the male genital somite

Ivanenko

Ferrari

Dahms‬

2008

Proceedings of the Biological Society of Washington

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Abstract.-The lateral face of the cephalosome deepens progressively during the six stages of copepodid development of Tegastes falcatus. A simple aesthetasc on the second from the proximal segment of the antennule is transformed into a bifurcate aesthetasc during the molt to copepodid II. Copepodids II-VI bear eight setae on the caudal ramus, a number unique to copepods. Formation of the arthrodial membrane separating the middle segment and distal complex of the endopod of swimming legs 2-4 is delayed until CVI, one stage later than the exopod. Gender dimorphism initially is observed in antennular segmentation, setation of the maxilliped and rami present on leg 5 at copepodid IV. At copepodid V, males and females differ in antennular segmentation, rami present on leg 5 and the shape of leg 6. Gender dimorphism at copepodid VI also includes the shape of the cephalosome, of the genital triple-somite complex, and of one seta on the caudal ramus. The morphology of the ventral attenuation of the sixth and seventh thoracic somites, the anterior abdominal somite, and the degree of rotation of leg 6 are compared for males of Tegastes falcatus, T. gemmeus, T ctenidus, Parategastes conexus and Syngastes sp. Tegastes is composed of species whose females and males have a genital triple-somite (sixth and seventh thoracic somites plus the anterior abdominal somite not separated by arthrodial membranes). Tegastidae are diagnosed as species with the rami of leg 1 unsegmented and basis elongate; male genital somite (seventh thoracic) extended ventrally; male leg 6 present only on one side; protopod of male leg 6 unarmed; female embryo sac with 3^ embryos; female leg 5 with broad baseoendopod forming embryo sac chamber. Species of the lineage Tegastidae plus Peltidiidae have males with an asymmetrical leg 6 in addition to the rectangular distal basal endite of the maxillule noted by Seifried (2003). A stout ventral spine with hyaline membrane on the distal segment complex of the exopod of swimming leg 4 also may be a synapomorphy for this lineage.

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Section: Maxilla (mentioning

confidence: 99%

Copepodid development of Tegastes falcatus (Norman, 1868) (Copepoda, Harpacticoida, Tegastidae) with a discussion of the male genital somite

Ivanenko

Ferrari

Dahms‬

2008

Proceedings of the Biological Society of Washington

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“…Ferrari et al (2007) also reported possible sexual dimorphisms in the seta formula, although they mentioned the possibility of polymorphism within the species. They redescribed Tegastes nanus from Ny Ålesund, Spitsbergen, which has six setae on the distal exopodal segment of P3 in the female, and seven in the male as reported by McAlice and Coffin (1990). In addition T. nanus has six setae on enp-3 of P4 in the female, but five in the male.…”

Section: Discussionmentioning

confidence: 98%

A New Species of the GenusTegastes(Copepoda: Harpacticoida: Tegastidae) from Hydrothermal Vents in the Okinawa Trough

2010

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We describe a new species, Tegastes okinawaensis, from 583-711 meter-deep hydrothermal vents in the Okinawa Trough, Japan. This species is clearly distinguishable from its congeners by four combined characters, namely 1) the last three abdominal somites are depressed inwardly towards the body, 2) there is sexual dimorphism in the number of setae of P3 and P4, 3) the male antennule is 9-segmented, with the 7th segment formed by incomplete fusion of two segments, and 4) the caudal rami are small with a distorted quadrangular shape. Additionally, the species is easily distinguishable from its congeners by the distal endopodal segment of P4, which is armed with six setae - this character has never been reported in previous descriptions of congeners. This report is the first of a species in the genus Tegastes living at ocean depths of greater than 580 m in the northwestern Pacific.

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First Records of Tegastes Falcatus (Norman, 1868) and T Nanus Sars, 1904 (Copepoda: Harpacticoida) from the East Coast of the United States and a Redescription of T. Nanus

Cited by 2 publications

References 6 publications

Copepodid development of Tegastes falcatus (Norman, 1868) (Copepoda, Harpacticoida, Tegastidae) with a discussion of the male genital somite

Copepodid development of Tegastes falcatus (Norman, 1868) (Copepoda, Harpacticoida, Tegastidae) with a discussion of the male genital somite

A New Species of the GenusTegastes(Copepoda: Harpacticoida: Tegastidae) from Hydrothermal Vents in the Okinawa Trough

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