Abstract
Wandogarida canalicula gen. n et sp. n. (Tanaidacea, Sphyrapodidae) is described from the southern coast of Korea (NW Pacific). The genus is included in the subfamily Sphyrapodinae Guţu, 1980 by having a mandible lacking a palp. It has a close affinity with the genus Poligarida Bamber & Marshall, 2013 in the third pereonite having lateral pointed apophyses, the antennule of males with fringes of aesthetascs on articles 1 and 2 of the outer flagellum and the antenna with an elongate article 2. However, it is distinguished from Poligarida by having a maxillular palp. Wandogarida gen. n. can be differentiated from other genera within the subfamily Sphyrapodinae by the unique shape characterised by the male’s antennule article 1 with its rough denticles and a deep groove, pleonites each with a ventral hyposphenium, the maxillule with uniarticulate palp and the presence of prominent sexual dimorphism in the mouthparts. An identification key to the five genera of the subfamily Sphyrapodinae is presented.
Highlights
The suborder Apseudomorpha Sieg, 1980 includes about 460 species and is widely distributed in various shallow marine benthic habitats, being quite abundant in coral reefs, estuaries and mangrove swamps, from the tropics to temperate regions (Błażewicz-Paszkowycz and Bamber 2012)
The type and other materials examined were deposited in the Marine Biodiversity Institute of Korea (MABIK), Seocheon, South Korea
To check the morphological variation with size, ten specimens (1.64– 2.73 mm) were partly dissected and the cheliped, the pereopod 1 and a ventral hyposphenium of pleonite were examined for different sizes and some variations were found: 1) in the cheliped, the dactylus and fixed finger of the males were modified in size: in the cheliped of the large sized males, the cutting edge of the dactylus is extended and strongly curved and the processes on the proximal margin are prominently developed; 2) the number and size of setae on the pereopod 1 propodus increased with size; 3) a ventral hyposphenium of the male pleonite is modified from a rounded shape to a subrectangular shape, with body length reaching over 2 mm
Summary
The suborder Apseudomorpha Sieg, 1980 includes about 460 species and is widely distributed in various shallow marine benthic habitats, being quite abundant in coral reefs, estuaries and mangrove swamps, from the tropics to temperate regions (Błażewicz-Paszkowycz and Bamber 2012). Guţu (1980) established the family Sphyrapidae, with two subfamilies Pseudosphyrapinae Guţu, 1980 and Sphyrapinae Guţu, 1980, to encompass a group of tanaidaceans characterised by the enlarged pereopod 1, the lack of spiniform apophyses on the carapace, the biramous antennule, the mandible with or without palp and the maxillule with palp. Later their familial and subfamilial names were emended to Sphyrapodidae Guţu, 1980 and Sphyrapodinae Guţu, 1980 and Pseudosphyrapodinae Guţu, 1980 by Larsen (2005).
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