Tanycypris alfonsi, Nagler & Geist & Matzke-Karasz, 2014

Nagler, Christina, Geist, Juergen & Matzke-Karasz, Renate, 2014, Revision of the genus Tanycypris (Ostracoda, Cypricercinae) with the description of Tanycypris alfonsi n. sp., and an identification key to the genus, Zootaxa 3821 (4), pp. 401-424 : 407-410

Tanycypris alfonsi n. sp.

( Figs 2–4 )

2004 Tanycypris pellucida (Klie) —Okubo: 57. 18 a, b, l–n.

Material examined 30 females from a container in the greenhouse of the Botanical Garden , Munich, Germany. Sampled in March 2011, deposited at the Zoologische Staatssammlung München .

Type material: Holotype —dissected female on glass slide and valves stored dry in micropalaeontological slides ( ZSMA20130101 ) . Paratypes —dissected females ( ZSMA20130102 , ZSMA20130103 , ZSMA20130104 , ZSMA20130105 ), whole female ( ZSMA20130106 ) , female valves ( ZSMA20130103 , ZSMA20130107 ) .

Type locality: Botanical Garden , Munich, Germany (48°9’49.22”N, 11°30’6.96”E) .

Etymology: The new species Tanycypris alfonsi is named after the first author’s grandfather, Alfons Nagengast, who passed away the month of the discovery of this new species.

Diagnosis. Carapace elongate, with length-height ratio of 2.7, maximum height at anterior quarter. Calcified inner lamella very wide with slight inward bulge in postero-ventral region. Carapace with a roof tile-like structure in the anterior region. Antennula with small Wouters and big Rome organ, both swollen apically. Caudal rami long and symmetric. Attachment of the caudal rami solid.

Description of female. Carapace ( Fig. 2A–F ) length 1.09–1.27 mm, height 0.39–0.53 mm (N = 25), in lateral view elongated with a length:height ratio of 2.7 (2.4–3.1) with maximum height at the anterior quarter. In dorsal view spindle shaped with maximum width approximately at midlength. Anterior and posterior ends rounded. Surface of valves with roof tile-like structure in the anterior region. Carapace in dorsal view narrow. Colour light green. LV in interior view ( Fig. 2B ) with a groove along anterior and ventral margin. Dorsal margin almost straight. Ventral margin slightly sinuous in the first third. Inner lamella without inner list, anteriorly and posteriorly broad with a sinuously formed enlargement. RV in interior view ( Fig. 2A ) without groove. Dorsal margin relatively straight, ventral margin slightly sinuous, inner lamella as in LV. Fused zone very narrow, with small marginal pore canals. Mandibular scars and adductor scars weak. A1 ( Fig. 3A ) with eight segments, first two of which fused together forming a large, elongate base. First segment with small, inconspicuous Wouters organ ( Fig. 2H ) and one long dorsal subapical seta. Second segment with two long ventro-distal setae. Third segment with big Rome organ ( Fig. 2G ) and with one very short dorso-apical seta. Fourth segment with one short dorso-distal seta and one short ventro-distal seta, reaching the end of the fifth segment. Fifth segment with two long dorso-distal setae and two short ventro-distal setae. Sixth segment with one short, one medium, and two long apical setae. Seventh segment with four long and one very short apical setae. Terminal segment with one long, one medium and one short seta and aesthetasc y a.

Coxa of A2 with three unequal setae. Base with very long ventro-apical seta. Exopod with one long and two very short setae. Endopod: first segment with a long aesthetasc Y and a medium-length ventro-distal seta. Natatory setae reaching to the distal end of claws. Second segment with four medio-ventral t-setae and two medio-dorsal unequal setae, distally with three serrated claws G1, G2, G3 (G2 the shortest), three long z-setae and a short, ventral aesthetasc y 2. Third segment with long claw GM and slightly shorter claw Gm, both serrated, g-seta and aesthetasc y 3, reaching to the first third of claw Gm ( Fig. 3B, D ).

Md ( Fig. 3E ) coxa with six teeth on endite and one subapical short seta. Md palp ( Fig. 3F ) elongate. First segment with a long smooth α-seta, one long seta and two long setae with setules. Second segment ventrally with a wide, cone-shape, plumose β-seta, three long setae with setules, and one medium-length smooth seta. Dorsally with two long and one medium-length seta. Third segment with a group of four long dorsal setae, a dorso-distal slender γ-seta with setules and a ventro-distal group of four medium-length, smooth setae. Terminal segment with three setae and three claws. Branchial plate with five rays.

Mx ( Fig. 3C ) with two-segmented palp, three endites and branchial plate. First palp segment with five apical setae and one subapical seta. Second segment elongated with three claws and three setae. Third endite with two large, serrated tooth-bristles and two smooth setae. Branchial plate with twenty rays dorsally and six rays ventrally.

T1 ( Fig. 4A ) large and elongate with two a-setae, one b- and one d-setae. Endite with fourteen apical setae. The long endopodite with three unequal apical setae with setules on the distal end.

T2 ( Fig. 4B ) with five segments. The first segment with a d1 seta and a d2 seta. Seta d1 longer than d2. Second segment with a long, stout, apical e seta. Third segment with a long, stout, f seta. The fourth segment with curved g seta. The final segment with two, short h1 and h3 seta and a long, curved, serrated claw h2.

T3 ( Fig. 4C ) with four segments. First segment with medium-length d1, d2 and dp setae. Second segment with e seta. Third segment with f seta in the middle. Terminal segment forming compact pincer organ with a long h3 seta and a short, curved h2 seta.

CR ( Fig. 4E ) long, stout, and ventrally serrated. The ventral Gp claw half the length of Ga claw. Both strongly serrated. Sa seta three-quarters the length of Ga. Sp seta long and acuminate. Right and left caudal ramus symmetric. Transition zone between CR and CR attachment very broad and compact. CR attachment ( Fig. 4D ) a stout, arcuate stem with triangular Triebel loop distally. Dorsal branch db very thin and strongly curved with a slim end. Ventral branch vb wide, short and rounded in outline.

Similar species. Tanycypris alfonsi n. sp. comes close to T. pellucida Klie, 1932 , but differs from it in the configuration of the setae at T1. T. alfonsi n. sp. has two a-setae, one b-seta, and one d-seta, while T. pellucida has two a-setae, two b-setae, one c-seta and one d-seta. The species also differ in the roof tile-like structure in the anterior region of the carapace (present in T. alfonsi n. sp., weak in T. pellucida ) and T. alfonsi n. sp. has a much wider calcified inner lamella than T. pellucida .

Remarks. Males unknown. A mode of locomotion previously unknown in ostracods has recently been described for T. alfonsi as well as for T. centa (Matzke-Karasz et al. in press). In these species, jumps of exceptional high speed have been observed and analysed by high-speed camera recordings.

Figures

FIGURE 2. Tanycypris alfonsi n.sp. A, RV interior view; B, LV interior view; C, RV exterior view; D, LV exterior view; E, Carapace in ventral view; F, Carapace in dorsal view; G, Rome organ; H, Wouters organ.

FIGURE 3. Tanycypris alfonsi n. sp. (ZSMA 20130101). A, An1; B, An2; C, Mx; D, An2-Detail; E, Md; F, Md palp. Scale bar = 100 µm for A–F.

FIGURE 4. Tanycypris alfonsi n. sp. (ZSMA 20130101). A, T1; B, T2; C, T3; D, CR attachment; E, CR. Scale bar = 100 µm for A–F.