Strandesia freyi Victor & Fernando, 1981c

Ma, Shunxin & Yu, Na, 2020, Freshwater ostracods (Crustacea) from Hainan Island, southern China, with description of a new species, Zootaxa 4767 (2), pp. 201-243 : 219-221

publication ID	https://doi.org/ 10.11646/zootaxa.4767.2.1
publication LSID	urn:lsid:zoobank.org:pub:7C2AB767-FB07-4366-9519-C110AAB18559
DOI	https://doi.org/10.5281/zenodo.3798881
persistent identifier	https://treatment.plazi.org/id/03ACDE06-C25F-FF8A-49F3-FD9DFE22FABE
treatment provided by	Carolina
scientific name	Strandesia freyi Victor & Fernando, 1981c
status

Treatment

Strandesia freyi Victor & Fernando, 1981c View in CoL

Figures 12–14 View FIGURE 12 View FIGURE 13 View FIGURE 14 .

1981c Strandesia freyi View in CoL n. sp. — Victor & Fernando: 481 –484, figs. 55–72.

Material examined: Two females and five female valves from WC5; One female ( ECNU 20170419/HN44) dissected.

Diagnosis: Carapace elongated and ornamented with small tubercules ( Fig. 12A and B View FIGURE 12 ). Natatory setae on A2 long, slightly exceeding terminal claws ( Fig. 13B View FIGURE 13 ). One tooth-bristle on third endite of Mx serrated, other one smooth ( Fig. 13D View FIGURE 13 ). Seta d present on L5 ( Fig. 13E View FIGURE 13 ). Claw Gp on UR approximately 70% of length of claw Ga ( Fig. 14B View FIGURE 14 ). UR attachment with Triebel’s loop situated at the main branch ( Fig. 14C View FIGURE 14 ).

Dimensions: Female, LV, n = 2, length 0.825 –0.832 mm, height 0.472 –0.480 mm; RV, n = 2, length 0.798 – 0.806 mm, height 0.447 –0.474 mm.

Description: Carapace ornamented with small tubercules. In lateral view, dorsal margin arched. Ventral margin slightly sinuous anterior of mid-length ( Fig. 12B View FIGURE 12 ). Calcified inner lamella anteriorly wide, without inner list. Anterior margin wider than posterior. Greatest height anterior of mid-length. LV with inner groove along margins except dorsal margin. In dorsal view, LV overlapping RV anteriorly ( Fig. 12A View FIGURE 12 ). Greatest width situated at mid-length.

A1 ( Fig. 13A View FIGURE 13 ) seven-segmented. First segment with tiny Wouters organ and two ventral setae. Second segment with one dorso-apical seta and Rome organ. Third segment with one dorso-apical and one ventro-apical seta. Fourth segment with two long dorso-apical setae and one long and one slightly shorter setae ventro-apically. Fifth segment with three long and one short setae. Sixth segment with four long setae and one alpha seta. Terminal segment with one short and two long setae and one aesthetasc ya.

A2 ( Fig. 13B View FIGURE 13 ) four-segmented. Exopodite consisting of a small plate and three setae (two short and one long), long one not reaching end of first segment of endopodite. Endopodite three-segmented. First endopodite segment with aesthetasc Y not reaching end of this segment. Five natatory setae long, exceeding tips of terminal claws, sixth one not reaching to middle of next segment. Claw Gm about 4/5 length of claw GM. Claw G2 slightly shorter than claws G1 and G3. Seta z3 long, setae z1 and z2 short, and almost in same lengths.

Md ( Fig. 13C View FIGURE 13 ) palp four-segmented. First segment with slim alpha seta. Second segment with stout and hirsute beta seta. Third segment with hirsute gamma seta.

Mx ( Fig. 13D View FIGURE 13 ) palp two-segmented. One tooth-bristle on third masticatory lobe serrated, other one smooth.

L5 ( Fig. 13E View FIGURE 13 ) with two short a setae, one long b seta and one long d seta.

L6 ( Fig. 13F View FIGURE 13 ) five-segmented. First segment with long d1 seta and short d2 seta. Second segment with e seta slightly exceeding end of next segment. Third segment with long f seta exceeding end of terminal segment. Fourth segment with g seta slightly exceeding end of terminal segment. Terminal segment with short h1 and h3 setae and claw h2.

L7 ( Fig. 14A View FIGURE 14 ) four-segmented. First segment with d1, d2 and dp setae. Second segment with e seta reaching to middle of next segment. Third segment with f seta at approximately mid-length. Terminal segment with pincer organ, short h1 and long h3 setae.

UR ( Fig. 14B View FIGURE 14 ) slender. Claw Gp about 70% of length of claw Ga. Seta Sa approximately half-length of claw Ga. Seta Sp short. UR stem with tiny setules.

UR attachment ( Fig. 14C View FIGURE 14 ) with Triebel’s loop situated at main branch, dorsal branch elongated and thin, ventral branch elongated, with distally swollen end.

Distribution: This species has only been previously reported from the Philippines ( Victor & Fernando 1981c). This species was found in Wenchang on Hainan Island.

Remarks: This species can be identified as a Strandesia by the mid-position of the Triebel’s loop of UR attachment ( Fig. 14C View FIGURE 14 ) and the presence of b and d setae on L5 ( Fig. 13E View FIGURE 13 ). The original description of S. freyi , based on material from the Philippines, was brief. Herein is a re-description of this species. Only five natatory setae were drawn on the A 2 in the original description (Figure 61 of Victor & Fernando 1981c), so either the specimen was a juvenile or it was an error.