A new genus of Ectinosomatidae (Copepoda, Harpacticoida) from sublittoral sediments in Ubatuba, São Paulo State, Brazil, including an updated key to genera and notes on Noodtiella Wells, 1965

Abstract

Both sexes of a new genus and species of Ectinosomatidae (Copepoda, Harpacticoida) from sublittoral sediments collected on the inner continental shelf in Ubatuba, São Paulo State (Brazil) are described in detail. Chaulionyx gen. n. (type species: C. paivacarvalhoi sp. n.) diff ers from all known genera in the presence of a conspicuous bifi d spine on the prehensile P1 endopod. It can be diff erentiated from other genera with a prehensile endopod (Halophytophilus Brian, 1919; Bradyellopsis Brian, 1925; Klieosoma Hicks & Schriever, 1985) by the presence of distinctive subrectangular middorsal pores on the urosomites and the unarmed male sixth legs.

A New Record of Microarthridion littorale (Copepoda, Harpacticoida, Tachidiidae) from Korea with Taxonomic Note on the Species

“…However, our specimens differ from the representative records of M. littorale (Poppe, 1881;Scott, 1892;Gurney, 1932;Borutsky, 1952;Tai and Song, 1979;Huys et al, 1996) by the following: (1) the maxillipedal syn coxa is armed with six groups of spinules and one group of long setules, while it is ornamented with only two rows of spinules in the records of Poppe (1881) and Gurney (1932); (2) the maxillipedal endopod has one long and one very small accessory setae, whereas it is armed with only one long seta in the materials of previous records; (3) both anter ior and posterior surfaces of the swimming legs are armed with several rows of setules or spinules, while these orna mentations are absent or simple in previous records; (4) the distal inner setae on enp3 of the swimming legs are distally serrate, whereas it is plumose in previous records; (5) the inner apical seta of P2 enp3 in males is slightly swollen at its proximal, while it is not expanded in the records of Gurney (1932) or Huys et al (1996). These morphological details hitherto have not been considered as key characters to identify Microarthridion species, although detailed fea tures such as body ornamentation pattern, pores and sensilla pattern, and the feature of the setae on swimming legs have been noticed as characteristic features in modern harpacti coid taxonomy (Huy et al, 2005;Kihara and Huys, 2009;Karanovic and Cho, 2012;Fiers and Kotwicki, 2013).…”

“…However, these discrepan cies might be due to observational errors or poor descrip tions by the previous authors. It is well known that such incomplete descriptions from the oldest records can increase taxonomic confusion on most harpacticoid taxa, including Ectinosomatidae Sars, 1903 (Kihara and Huys, 2009).…”

Figure 6 from: Boonyanusith C, Athibai S (2021) A new species of Rangabradya (Copepoda, Harpacticoida, Ectinosomatidae) from a cave in Satun Province, southern Thailand. ZooKeys 1009: 45-66. https://doi.org/10.3897/zookeys.1009.54554

“…Representatives of the family occupy a wide array of habitats. Most species are known from the fine sediments of the sublittoral marine environments (Kihara and Huys 2009), although, many species inhabit the abyssal plains (Bodin 1968;Seifried et al 2007), and a few have been described from the surface and subterranean freshwater habitats (Karanovic and Pesce 2001). Additionally, a few species are symbionts (Boxshall and Halsey 2004;George and Schwabe 2019).…”

A new species of Arenosetella Wilson, 1932 from Turkey with notes on the genus (Copepoda, Harpacticoida, Ectinosomatidae)

“…The genus Arenosetella CB Wilson, 1932 is one of the 21 genera of the family Ectinosomatidae (Wells 2007, Kihara andHuys 2009) and currently has 21 valid species / subspecies (Wells 2007). They are all marine and interstitial, and can easily be differentiated from other ectinosomatids by their vermiform body, well-developed maxilla and the dorsal ornamentation of the anal somite.…”