Hemicypris kliei ( Lindroth, 1953 ) Bate, 1972

Smith, Robin James & Chang, Cheon Young, 2020, Taxonomic assessments of some Cyprinotinae Bronstein, 1947 species (Crustacea: Ostracoda) from Japanese and Korean rice fields, including (re-) descriptions of six species and a review of the type species of the subfamily, Zootaxa 4795 (1), pp. 1-69 : 40-48

publication ID	https://doi.org/ 10.11646/zootaxa.4795.1.1
publication LSID	lsid:zoobank.org:pub:FC5E4D2F-5C9B-47B3-BE97-FB52C9D6A0CB
persistent identifier	https://treatment.plazi.org/id/03A5FD36-FFCC-D457-80F5-A1A1FB2AAF73
treatment provided by	Plazi
scientific name	Hemicypris kliei ( Lindroth, 1953 ) Bate, 1972
status

Treatment

Hemicypris kliei ( Lindroth, 1953) Bate, 1972

( Figs 20–25 View FIGURE 20 View FIGURE 21 View FIGURE 22 View FIGURE 23 View FIGURE 24 View FIGURE 25 A–F)

1953 Cyprinotus kliei n. sp. —Lindroth: 66–70, figs 24–33.

1972 Hemicypris klei [sic] (Lindroth)—Bate: 184–185, text-fig. 1a & b.

1974 C. kliei —Purper & Würdig-Maciel: 73.

1979 Hemicypris kliei (Lindroth) —Carbonel & Peypouquet: 172, 173, Fig. 12 View FIGURE 12 , Table IV.

1979 Hemicypris kliei Lindroth [sic]—Peypouquet et al.: 211.

1981 Cyprintous kliei —Battish: 649.

1983 Hemicypris kliei (Lindroth, 1956) [sic]—Broodbakker: 156, Table 1.

1984a H. kliei (Lindroth) —Martens: 10, 11, 32, 36.

1984b H. kliei ( Lindroth, 1953) —Martens: 149.

1986 Hemicypris kliei —Cohen: 183, 186, 187, 189–193, fig. 5, 6, appendix.

1990b Hemicypris kliei —Martens: Table 2.

1990a Hemicypris kliei —Martens: 482.

1994 Hemicypris kliei (Lindroth) —Martens & Behen: 5.

1994 Hemicypris kliei ( Lindroth, 1953) —Schöning: 92, 97, Tafel II, Figs 9–10 View FIGURE 9 View FIGURE 10 .

1996 Hemicypris kliei —Pachur & Wünnemann: 20.

2002 Hemicypris kliei ( Lindroth, 1953) —Martens: Table 9.1.

2008 Hemicypris kliei ( Lindroth, 1953) Bate, 1970 —Savatenalinton & Martens: Table 1.

2009 Hemicypris kliei —El-Shabrawy & Fishar: 573.

2011 Hemicypris kliei ( Lindroth, 1953) —Martens & Savatenalinton: Table 2.

2012 H. kliei ( Lindroth 1953) —Karanovic: 438, 441.

2013 Hemicypris kliei —Cohen et al.: 86, 94, fig. 8i.

2013 Hemicypris kliei ( Lindroth, 1953) —Martens et al.: No page numbers.

2019 Hemicypris kliei ( Lindroth, 1953) —Meisch et al.: 64.

Diagnosis. Surface mostly covered with inconspicuous, shallow, poorly defined, small pits (observed with SEM), with exception of middle areas near adductor muscles, which are smooth, and on left valve near anterior margin, where pits are deeper and better defined than elsewhere. Calcified inner lamella of right valve with groove running from mid-height of anterior margin, along ventral margin and fading at postero-ventral margin. Antennal aesthetasc Y 31% length of dorsal sclerotised margin of first endopodal segment, swimming setae long, reaching beyond ends of claws. Female antenna: claw G2 long, ca. 85% length of claw G1, claw Gm slender and long, ca. 78% length of GM. Male antenna: Gm small and slender, 40% length of claw GM. Mandibular gamma seta short and triangular, with wide base and long setules distally. Maxillula third endite with one smooth and one lightly serrated Zahnborsten. Sixth limb first segment with d1 seta, second segment with e seta reaching beyond distal end of third segment, third segment with f seta reaching to slightly beyond distal end of fourth segment. Seventh limb (cleaning limb) with seta d1 on first segment shorter than d2 and dp of same segment, second segment with long e seta reaching to distal end of third segment. Caudal ramus claw Ga noticeably larger than claw Gp, both claws slender, seta sp long, longer than claw Gp. Hemipenis medial shield with unevenly curved outer and distal margins. Ventral lobe of lateral shield slender and gently curved towards inner margin. Dorsal lobe of lateral shield rounded and variable in amount of protrusion.

Material examined. Syntypes. KENYA • 1 ♀, with soft parts dissected in glycerine and sealed in a slide, valves stored dry in a micropalaeontological slide; Lake Turkana; UUZM TYP 603 x. • 1 ♀, dissected and mounted on glass slides in an unknown matrix; Lake Turkana; UUZM TYP 603 h. • 1 ♀, left valve, stored dry in a micropalaeontological cavity slide; Lake Turkana; UUZM TYP 603t. • 3 ♂♂, dissected and mounted on glass slides in an unknown matrix; Lake Turkana; UUZM TYP 603 e, UUZM TYP 603 f, UUZM TYP 603 j.

Other material. KENYA • 1 specimen, fossil left valve stored in micropalaeontological cavity slide; Turkana County, Lothagam Hill ; [2.9213º N, 36.0648º E]; M. D. Gwynne leg.; age uncertain, possibly Holocene or Pleistocene; NHMUK PM os 19889 GoogleMaps .

Description. Carapace, right valve overlaps left. Length 930–1060 µm, height 530–620 µm ( Lindroth 1953), height / length 0-60–0.61. Dorsal margin strongly curved, maximum height slightly posterior of mid-length ( Figs 20 View FIGURE 20 , 21 View FIGURE 21 & 22 View FIGURE 22 ). Posterior margin unevenly curved with apex below mid-height.Anterior margin less inflated than posterior margin, slightly more curved below mid-height. Ventral margin slightly concave. Left valve with line of welldeveloped marginal denticles along postero-ventral and antero-ventral margins; lines of marginal denticles joined by list in middle region of ventral margin ( Figs 20E, H, I View FIGURE 20 , 21C, E View FIGURE 21 , 22C View FIGURE 22 ). Left valve with crescent of well-defined, small pits (ca. 3 to 5 µm across) near anterior margin. Elsewhere, carapace mostly covered with very shallow and poorly defined small pits (observed with SEM), with exception of middle areas near adductor muscles, which are almost smooth. Inner lamellae of both valves very narrow. Inner lamella of right valve with groove running parallel to valve margin from mid-height of anterior margin, along ventral margin and fading at postero-ventral margin, and with very faint list running from antero-dorsal margin to mid-height of anterior margin. Poorly defined marginal sockets in antero-ventral and postero-ventral regions of inner calcified lamella of right valve. Irregular pitting observed on calcified inner lamella (see Remarks). Inner lamella of left valve with slight ridge running parallel to anterior margin; in Typ 603x faint list runs along ridge ( Fig. 21C View FIGURE 21 ), but similar list absent in Typ 603t ( Fig. 22C View FIGURE 22 ).

Antennule with seven articulated segments ( Fig. 23A View FIGURE 23 ). First segment large, with tiny Wouters organ on proximal part of dorsal margin, one seta on dorsal margin just anterior of mid-length, and two long setae near apical-ventral corner. Second segment wider than long, with one seta on apical-dorsal corner, and tiny Rome organ on ventral margin. Third segment longer than wide, with one seta on apical-dorsal corner and one short seta near apical-ventral corner. Fourth and fifth segments each with two long setae on apical-dorsal corner, and two shorter setae on apicalventral corner. Sixth segment with four long and one shorter (alpha) apical setae; alpha seta about three times length of dorsal margin of terminal segment. Terminal segment with one long, one medium-length and one short setae, and aesthetasc ya.

Female antenna, exopodite with long seta approximately reaching to end of first endopodal segment, mediumlength seta one-third length of longest seta, and short seta ( Fig. 23B View FIGURE 23 ). Aesthetasc Y 31% length of dorsal sclerotised margin of first endopodal segment (marked with dotted arrowed line on Fig. 23B View FIGURE 23 ). Swimming setae long, reaching beyond ends of claws. Setae t2-4 relatively long, reaching beyond mid-length of claws, t1 shorter ( Fig. 24A View FIGURE 24 ). Claw G2 long, ca. 85% length of claw G1. Claw Gm slender and long, ca. 78% length of GM. N.B. Claws G1–3, and GM of antenna of specimen dissected for current study appear truncated (worn) distally. Therefore in other specimens claws maybe slightly longer.

Male antenna difficult to observe in detail. Claw Gm 40% length of claw GM ( Fig. 24B View FIGURE 24 ).

Mandible palp, first segment with small, slender alpha seta, tapering distally to setule-like distal end ( Fig. 23C & D View FIGURE 23 ). Second segment 3+1+beta setae on inner edge, and three setae on outer edge. Beta seta setulous and similar in length to alpha. Third segment with group of four sub-apical setae on outer edge, gamma + 3 setae along distal edge, one long and one very short setae on inner sub-apical edge. Gamma seta short, triangular and wide, with long setules distally ( Fig. 23D View FIGURE 23 ). Terminal segment with three stout claw-like setae and three smaller setae. Mandibular coxa robust, typical of family ( Fig. 23E View FIGURE 23 ).

Maxillula palp, first segment with group of five setae on outer apical edge, all of varying lengths, and two subapical setae, one of which long, located on outer edge, and other, shorter seta displaced inwards ( Fig. 23F View FIGURE 23 ). Second segment sub-quadrate, slightly widening distally, apically with three claw-like robust setae, and three smaller setae. Third endite with one smooth and one lightly serrated Zahnborsten.

Fifth limb (maxilliped) female, basis with two short a setae, and long d and b setae; c seta missing, typical of subfamily ( Fig. 24C View FIGURE 24 ). Endite with ca. 15 apical setae. Exopodite (branchial plate) with six rays. Palp with three apical setae of unequal lengths.

Male palps asymmetrical, left palp terminating with finger-like, tightly curved hook, right palp terminating with larger, inflated and rounded hook ( Fig. 23G & H View FIGURE 23 ). N.B. In Lindroth’s (1953) description, the hooks of the male fifth limb palps terminate with small, pointed projections, typical of the subfamily. In the material examined these were not observed, but this is probably related to the age of the material and the mounting medium (some mounting mediums slowly dissolve non-sclerotised parts).

Sixth limb (walking leg) robust with five articulated segments ( Fig. 24D View FIGURE 24 ). First segment with d1 seta. Second segment with e seta reaching beyond distal end of third segment. Third segment with f seta reaching to slightly beyond distal end of fourth segment. Fourth segment with two g setae; one relatively long and one tiny. Fifth segment with h3 longer than h1, and h2 claw long and robust.

Seventh limb (cleaning limb) with seta d1 on first segment shorter than d2 and dp of same segment ( Fig. 24E View FIGURE 24 ). Second segment with long e seta reaching to distal end of third segment. Third segment with f seta at mid-length, almost reaching to distal end of segment. Terminal segment part of pincer structure typical of family.

Caudal ramus with claw Ga noticeably larger than claw Gp, both claws slender ( Fig. 25A & B View FIGURE 25 ). Seta sp long, longer than claw Gp. Seta sa slender and relatively long. Male and female caudal rami similar.

Hemipenis basal capsule with relatively straight inner margin ( Fig. 25 View FIGURE 25 C–F). Medial shield with unevenly curved outer and distal margins. Ventral lobe of lateral shield slender and gently curved towards inner margin. Dorsal lobe of lateral shield rounded and variable in amount of protrusion. N.B. Internal structure of the hemipenes is not clearly visible due to the mounting medium. Zenker Organ with 29 internal rosettes.

Remarks. The irregular pitting on the calcified inner lamella in specimen Typ 603x is interpreted as an artefact, possibly occurring during storage ( Fig. 21F View FIGURE 21 ). In the topotype material of Hemicypris posterotruncata , consisting of numerous carapaces and valves in sediment, one left valve that appears to be Hemicypris kliei was recovered ( Fig. 22E & F View FIGURE 22 ). This is smaller than topotype material of Hemicypris kliei , and the outer surface of the valve is not well enough preserved to see the shallow pits on the surface, although pits near the anterior margin are visible.

Hemicypris posterotruncata was considered to be a junior synonym of Hemicypris kliei ( Martens 1984a) , but examination of type material for this study indicates that this is not the case (see under Hemicypris posterotruncata for more details and Table 2).

Previous records of Hemicypris kliei by Cohen et al. (2013) are considered correct identifications (and not Hemicypris posterotruncata ) as specimens are covered with shallow pits. Other records of Hemicypris kliei remain uncertain as figures of the external ornamentation are lacking.

Distribution. Living specimens of Hemicypris kliei are known from Lake Turkana, Kenya ( Lindroth 1953; Cohen 1986) and Lake Langano, Ethiopia (Martens 1990) ( Fig. 10 View FIGURE 10 ). Quaternary records are from the Lake Rukwa Basin, Tanzania ( Cohen et al. 2013), Sudan ( Schöning 1994; Pachur & Wünnemann 1996), and the Omo Beds in Kenya ( Carbonel & Peypouquet 1979). The valve of Hemicypris kliei ? found during this study in the topotype material of Hemicypris posterotruncata is from sediments near Lake Turkana (locality in Bate 1970).