A new marine interstitial Psammogammarus (Crustacea, Amphipoda, Melitidae) from Gura Ici Island, off western Halmahera (North Moluccas, Indonesia), and an overview of the genus

Abstract

Psammogammarus wallacei sp. n. is described from the shallow marine interstitial of a sand and coral rubble beach on the Gura Ici islands (North Moluccas; Indonesia). This is the first record of this circum-tropical genus from SE Asia, with the geographically closest relative inhabiting the Ryukyu archipelago in Japan. The new species is highly distinctive by the display of sexual dimorphism on pleopod II, with the medial margin of the male proximal article of exopod provided with a comb of short, blunt curved spinules; no other representative of the genus is known to display sexually-dimorphic appendages aside of the gnathopods. The new species is also noteworthy by the outline of the palm margin of male gnathopod II, hardly excavated, and by showing a carpus broader than long. An overview of the genus Psammogammarus with 14 species to date is provided

Three new species of the Eriopisa group (Crustacea: Amphipoda: Eriopisidae) from Japan, with the description of a new genus

“…Confodiopisa, Flagitopisa and Impertiopisa were synonymized with Psammogammarus by Stock & Sanchez (1987), van der Ham & Vonk (2003 analyzed the Eriopisa group phylogenetically and stated "Psammogammarus is a junior synonym of Eriopisa", and Sawicki et al (2005) reinstated Flagitopisa. However, recent taxonomic papers on Psammogammarus (Tomikawa et al 2010;Vonk et al 2011;Jaume et al 2013) recognized Psammogammarus as a valid genus and Confodiopisa and Impertiopisa as synonymized genera; therefore I follow the papers in the present study.…”

A new genus and species of Ingolfiellidae (Crustacea, Ingolfiellida) from the hyporheic zone in the Sierra de la Ventana, and its biogeographic relevance

“…Yacana n. gen. has notches or pockets in its gnathopods, while Proleleupia exhibit a pocket only in the first pair and Trogloleleupia a "depression selliforme" in the second one; furthermore, in Yacana n. gen. the pocket of gnathopod 1 is associated with a spine (Ruffo 1985;Griffiths 1991). Carpus with a pocket or notch had been described in a few species of Ingolfiella, like I. moluccensis Jaume, 2013 andI. arganoi Ianilli & Pereiopods are dissimilar, all of them with setae and a terminal claw; pereiopods 7 differ from the others in size, number and arrangement of their setae.…”

“…Hansen (1903) described the family Ingolfiellidae from specimens collected in deep sea waters of the North Atlantic Ocean. The order Ingolfiellida is presently known by 45 species (Vonk & Jaume 2013) included in two families, Metaingolfiellidae (Ruffo 1969) and Ingolfiellidae (Vonk & Schram 2003;Shimomura et al 2006), distributed worldwide, with underground habits and wide habitat tolerances, of which the most important are: sea water at different depths (Hansen 1903;Shimomura et al 2006), brackish water (Stock 1976;Peralta & Grosso 2009) and interstitial marine water (Vonk & Schram 2003), freshwater (Karaman 1959), mountain streams (Noodt 1965) and continental underground waters (Ruffo 1985). Four species of ingolfiellids have been reported so far from South America, all in the genus Ingolfiella Hansen, 1903.…”

A new Ingolfiellid (Crustacea, Amphipoda, Ingolfiellidae) from an anchialine pool on Abd al Kuri Island, Socotra Archipelago, Yemen

“…Geographically it is an interesting region as it forms the corridor between the better known Mediterranean and south east Asian/Australian stygofaunas. Sampling by Stock and Nijssen (1965) on Entedebir Island in the southern Red Sea revealed the presence of the circumtropical marine groundwater amphipod genus Psammogammarus (Vonk and Stock 1987; Vonk 1990; Van der Ham and Vonk 2003; Tomikawa et al 2010; Vonk et al 2011), suggesting the possible occurrence of the usual inhabitants of the present coastal groundwater biotope. In this respect also Angeliera xarifae Siewing, 1959 can be mentioned.…”