Cypretta karanovicae n., 2014

Smith, Robin James, Lee, Jimin & Chang, Cheon Young, 2014, Nonmarine Ostracoda (Crustacea) from Jeju Island, South Korea, including descriptions of two new species, Journal of Natural History 49 (1), pp. 37-76 : 53-58

Cypretta karanovicae n. sp.

( Figures 5A–E , 6 , 7 )

Type locality

An irrigation pond about 1 m deep in Samdal-ri , Seongsan-eup , Seogwipo-si, Jeju Island, South Korea (33° 23 ′ 1.07 ′′ N, 126° 50 ′ 15.33 ′′ E) (locality 26 on Figure 1 ) .

Type material

Holotype – dissected female ( NIBRIV0000297035 ) . Paratypes – three dissected females ( NIBRIV0000297036 , DB40041, DB40042 ) and one whole, dried female ( DB40043 ) .

Material examined

Eleven females (including type material) collected from the type locality, 8 September 2013.

Derivation of name

Named after Dr. Ivana Karanovic, Hanyang University, South Korea, in recognition of her contribution to Korean ostracod studies.

Diagnosis

Carapace relatively compressed in lateral view (H/L = 0.6), and sub-triangular in shape. Anterior margin slightly more inflated than posterior margin. Right valve overlaps left. Septa well developed along anterior margins of both valves. Dorsal view with maximum width posterior of mid-length. Surface of valves strongly pitted in central area; shallower pits towards margins of valves. Carapace with distinctive dark green patches. Claw G2 of antenna with robust serration, and approximately 85% length of claw G1, claw Gm very slender, approximately 80% length of claw GM. Alpha seta of mandibular palp with wide base, tapering distally and sporting one long, fine setule, and beta seta stout with numerous stiff setules. Sixth limb with short d1 seta, much shorter than d2 seta, and long f seta, reaching well beyond end of fifth segment. Caudal ramus with no sa seta, long Ga claw, and very small Gp claw and sp seta; seta sp longer than claw Gp.

Description

Carapace ( Figures 5A–E , 6A ) length 635–649 µm, height 366–376 µm. Right valve overlaps left along all margins. Lateral view sub-triangular, dorsal margin unevenly curved with clear hump at mid-length, very gently curved either side of hump. Anterior margin slightly more inflated than posterior margin, maximum curvature below mid-height. Ventral margin sinuous. Both valves with well-developed outer lists along ventral margins. Dorsal view egg-shaped with maximum width posterior of mid-length, posterior margin evenly rounded and more inflated than anterior margin; anterior margin slightly angular either side of valve margins. Internally, calcified inner lamella wider anteriorly than posteriorly, and right valve with well-developed groove running near free margin. Septa well developed along anterior margins of both valves. Surface of valves strongly pitted in central area, with shallower and smaller pits towards valve margins. Dorsal areas of valves almost smooth. Colour yellowish with dark green patches ( Figure 7F ).

Antennule ( Figure 6B ) with seven articulated segments. First segment with one dorsal seta and two long ventral setae. Second segment with tiny Rome organ and one short dorsoapical seta. Third segment with one short dorsoapical seta and one short ventroapical seta. Fourth and fifth segments each with two long dorsoapical setae and two short ventroapical setae. Sixth segment with four long and one tiny apical setae. Seventh segment with two long and one medium-length setae, and aesthetasc ya.

Antennal ( Figure 6C ) natatory setae on third segment long, extending to just beyond ends of claws. Shorter seta accompanying long natatory setae relatively very long, extending well beyond end of segment. Claw Gm very slender, approximately 80% length of claw GM. Claw G2 approximately 85% length of claw G1, and with serration more robust than other claws. Seta z3 stout, almost as long as claw G2.

Mandibular palp with four segments ( Figure 6D ). Alpha seta of mandibular palp with wide base, tapering distally and sporting one long, fine setule. Beta seta stout with numerous stiff setules ( Figure 6E ).

Maxillula ( Figure 7A ) with two-segmented palp. First segment with four setae on outer apical edge and one seta in sub-apical position near outer edge. Final segment elongate with one robust, claw-like seta and four more slender setae. Third endite with two smooth Zahnborsten.

Fifth limb ( Figure 7B ) endite with approximately 12 setae distally, and slender d seta on inner edge. Palp elongate and very lightly sclerotized, terminating with one long and two shorter setae.

Sixth limb ( Figure 7C ) five-segmented, first segment with short d1 seta and longer d2 seta. Second segment with long e seta, extending to end of fourth segment. Third segment with long f seta reaching well beyond end of fifth segment. Fourth segment with short g seta, reaching to approximately end of fifth segment. Fifth segment with tiny h3 seta, longer h1 seta and well-developed, robust claw h2.

Seventh limb ( Figure 7D ) first segment with d1, d2 and dp setae. Second segment with relatively short e seta. Third segment with short f seta at approximately midlength. Pincer with short h3 seta and short, stout h2 seta.

Caudal ramus ( Figure 7E ) with delicate and short ramus. Claw Ga long, more than half length of ramus. Claw Gp very short, shorter than adjacent Sp seta. Sa seta absent.

Remarks

Three previously described species of Cypretta have a similar low lateral view to C. karanovicae n. sp.: C. baylyi McKenzie, 1966 , C. lutea McKenzie, 1966 and C. patialaensis Battish, 1982 . Cypretta baylyi is known from north-western Australia ( McKenzie 1966; De Deckker 1981; Bayly 1997) and differs from C. karanovicae n. sp. in that the dorsal margin is more evenly curved, the anterior margin is more inflated and the dorsal view is slightly less globular with maximum width further towards the anterior. Additionally, C. baylyi is strongly pitted over the entire carapace surface and the caudal ramus has a much longer Gp claw compared with C. karanovicae n. sp. Cypretta lutea is another species known from north-western Australia ( McKenzie 1966) and in addition to the low lateral view of the carapace, has a similar dorsal view to C. karanovicae n. sp. It differs from C. karanovicae n. sp. in that the surface is smooth with scattered pits, the dorsal margin is more evenly rounded, it lacks green patches, and the Gp claw of the caudal ramus is considerably longer at over half the length of claw Ga. Cypretta patialaensis is an Indian species ( Battish 1982), which is distinguished by a noticeable asymmetry in dorsal view. Additionally, the carapace lacks green patches, and the Gp claw of the caudal ramus is much longer than that of C. karanovicae n. sp.

The caudal ramus of C. karanovicae n. sp. is unusual in that seta sp is larger than claw Gp, in contrast to most other species where Gp is larger than sp (some species lack sp). However, even though the taxonomy of the genus relies very heavily on the morphology of the caudal ramus, this appendage is partially reduced in Cypretta species, and thus the lengths of claws and setae could be relatively plastic. Further work is required to determine whether this appendage is a robust taxonomic character for species discrimination in this genus. So far this species is only known from the type locality (locality 26).

Figures

Figure 1. Map of Jeju Island. Localities 1–24, northern side of Mount Halla, Jeju city area: 1, Suwolbong cave, Gosan-ri, Hangyeong-myeon; 2, Yonguncheon, Gosan-ri; 3, swamp, Yongdang-ri; 4, Cheongsu-gotjawal marsh; 5, Eoum-ri, Aewol-eup (pond); 6, Bilremot Pond, Eoeum-ri; 7, Dombaemul Pond, Eoeum-ri; 8, Geumseong-cheon estuary; 9, Gwakji-ri (coastal spring); 10, Sangga-ri (pond); 11, Sowangcheon spring, Goseong-ri; 12, Gusimul spring, Goseong-ri; 13, Cheonwangsa Temple, Nohyeong-dong; 14, Bonggae-dong (streamlet); 15, Halla Eco-forest, Bonggae-dong; 16, Jeolmul Forest, Bonggae-dong; 17, Gyorae-ri (streamlet); 18, Sinchon-ri, Jocheon-eup (salt marsh); 19, Keunmul spring, Sinchon-ri; 20, Jocheon Port (coast spring); 21, Dongbaek park, Seonheul-ri; 22, Banmot Pond, Seonheul-ri; 23, Jongdal-ri, Gujwa-eup (reed marsh); 24, Udo islet (spring). Localities 25–35, southern side of Mount Halla, Seogwipo city area: 25, Wolrangji, Nansan-ri, Seongsan-eup; 26, Samdal-ri (pond); 27, Taeheung-ri, Namwon-eup (salt marsh); 28, Hannam-ri (reservoir); 29, Jeongbang Fall, Seogwipo-dong; 30, Saeseom islet; 31, Geolmae Eco-Park, Seoheung-dong; 32, Yeongcheoncheon stream, Sanghyo-dong; 33, Dosuncheon stream, Hawon-dong; 34, 1100- Hill Swamp; 35, Yeraecheon stream, Haye-dong.

Figure 5. (A–E) Cypretta karanovicae n. sp.: (A) left view of female carapace (paratype, DB40043); (B) internal view of female left valve (holotype, NIBRIV0000297035); (C) internal view of female right valve (holotype, NIBRIV0000297035); (D) dorsal view of female carapace, anterior to right (paratype, DB40043); (E) ventral view of female carapace, anterior to right (paratype, DB40043). (F–J) Cypretta seurati: (F) left view of female carapace (DB40038); (G) internal view of female left valve (DB40039); (H) internal view of female right valve (DB40039); (I) dorsal view of female carapace, anterior to right (DB40038); (J) dorsal view of female carapace, anterior to right (DB40040). Scale bar = 300 µm.

Figure 6. Cypretta karanovicae n. sp. (A) internal view of female right valve (holotype, NIBRIV0000297035); (B) female antennule (paratype, NIBRIV0000297036); (C) female antenna (holotype, NIBRIV0000297035); (D) female mandibular palp (paratype, DB40042); (E) detail of alpha and beta setae of mandibular palp (paratype, DB40042).

Figure 7. Cypretta karanovicae n. sp. (A) female palp and endites of maxillula (setae on endites not drawn) (paratypes, DB40042); (B) female fifth limb (paratype, DB40042); (C) female sixth limb (holotype, NIBRIV0000297035); (D) female seventh limb (paratype, DB40041); (E) female caudal ramus (holotype, NIBRIV0000297035); (F) dorsal view of whole carapace showing coloration pattern.