Generic revision of Cypricercinae McKenzie, 1971 (Crustacea, Ostracoda), with the description of three new genera and one new species and a phylogenetic analysis of the subfamily

Abstract

The Cypricercinae are one of the most speciose subfamilies of non-marine ostracods, with more than 170 described species, mostly from the tropics. Although the identity of the subfamily as such is clear, because of the presence of unifying characters such as the Triebel's loop in the attachment of the caudal ramus, the supra-specific taxonomy of this group has long been confused because of lack of good generic and tribal characters. Here, the generic characters of the Cypricercinae are revised. Eleven genera are retained in this subfamily, including three new genera: Bradleytriebella n. gen., Nealecypris n. gen. and Pseudostrandesia n. gen. Tanycypris siamensis n.sp. is described from Thailand. In addition, five species [Bradleystrandesia fuscata (Jurine, 1820), Bradleytriebella tuberculata (Hartmann, 1964), Nealecypris obtusa (Klie, 1933), Pseudostrandesia striatoreticulata (Klie, 1932), Spirocypris horrida (Sars, 1926)] are redescribed. A key to the genera is given. We propose three tribes: the nominal tribe Cypricercini McKenzie, 1971, as well as two new tribes, Bradleystrandesiini n. trib. and Nealecypridini n. trib. To evaluate the systematic relationships within this subfamily, phylogenetic analyses, based on morphological characters of valves and soft parts, were conducted. The Neighbour Joining (NJ) tree strongly supports the classification into three independent tribes, whereas the Maximum Parsimony (MP) tree shows that Bradleystrandesiini n. trib is actually a subgroup of the Cypricercini.

Revision of the genus Tanycypris (Ostracoda, Cypricercinae) with the description of Tanycypris alfonsi n. sp., and an identification key to the genus

“…Tribe Nealecypridini Savatenalinton & Martens, 2009 The Tribe Nealecypridini includes the genera Astenocypris G. W. Müller, 1912, Diaphanocypris Würdig & Pinto, 1990, Nealecypris Savatenalinton & Martens, 2009and Tanycypris Triebel, 1959. These species differ from other Cypricercinae-tribes by a narrow carapace in dorsal view, a Triebel loop either without vb or with a short vb, located in the middle of the distal CR attachment (Savatenalinton & Martens 2009a).…”

“…The valves in Okubo (1972: fig. 1a-c) show a much higher congruence with those of T. siamensis Savatenalinton & Martens (Savatenalinton & Martens 2009a: fig. 8A) than with Tressler's drawings of Strandesia camaguinensis (= Tanycypris pellucida Klie 1932).…”

“…Müller, 1898), Tanycypris madagascarensis (G.W. Müller, 1898), Tanycypris marina (Hartmann, 1965), Tanycypris pedroensis (Tressler, 1950), Tanycypris pellucida (Klie, 1932), Tanycypris siamensis (Savatenalinton & Martens, 2009a) and Tanycypris telavivensis (Krampner, 1928) (Savatenalinton & Martens 2011;Chang et al 2012).…”

“…Since most descriptions of the tribe Nealecyprididni do not consider all taxonomically relevant characters, the following species had to be reexamined: Cypricercus inermis (Brady, 1904), Diaphanocypris meridana (Furtos, 1936), Dolerocypris sagitta Klie, 1939, Herpetocypris bonettoi Ferguson, 1967, Nealecypris obtusa (Klie, 1933, Tanycypris camaguinensis Tressler, 1937, Tanycypris centa Chang et al, 2012, Tanycypris clavigera (Müller, 1898, Tanycypris madagascarensis (Müller, 1898), Tanycypris marina (Hartmann, 1965), Tanycypris pellucida (Klie, 1932), Tanycypris siamensis Savatenalinton & Martens, 2009a, Tanycypris telavivensis (Krampner, 1928), Strandesia pedroensis Tressler, 1950.…”

“…CR symmetric, long (two-third of the length of the valves), claws strongly serrated. CR-attachment with Triebel loop at the middle, vb short, stout or pointed, db well developed (Müller 1898, Triebel 1959, Victor & Fernando 1981, Savatenalinton & Martens 2009a Type locality: Botanical Garden, Munich, Germany (48°9'49.22"N, 11°30'6.96"E).…”