南海南部海域浮游介形类新种——南沙深海浮萤*

doi:10.11978/2021042

Abstract

Abstract:

A new species of halocyprid ostracod, Bathyconchoecia nanshaensis sp. nov., from the Nansha Trough (the North-West Borneo Trough), southern South China Sea is illustrated and described in detail. The species is a small one that closely resembles Bathyconchoecia paulula Deevey, 1968 and Bathyconchoecia pacifica Chavtur, 1977 in terms of its carapace length (CL; <1.0 mm) and relative height (~70% CL). However, it can be easily distinguished from these species by the locations of its asymmetrical glands’ opening, by the structure of the coxal toothed edge of the mandible, and by the setation of the sixth limb.

Key words: Bathyconchoeciinae, systematics, zooplankton, Nansha Trough, Pacific Ocean

CLC Number:

P735.532

YIN Jianqiang, LI Kaizhi, TAN Yehui. Bathyconchoecia nanshaensis sp. nov. (Myodocopa, Halocyprididae), a new species of ostracod from the southern South China Sea*[J].Journal of Tropical Oceanography, 2022, 41(2): 193-197.

Figures/Tables 4

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References 18

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Characteristics	B. paulula (♂)	B. pacifica (♂)	B. nanshaensis (A-1 ♂)
Carapace
Length/mm	0.95	0.90~0.97	0.87
Height/Length/%	70	70	69
Rostrum	Slightly bent downwards	Sharply bent downwards	Slightly bent downwards
Asymmetric glands	Opening at posterodorsal corner	Opening at posterodorsal corner	Opening on posterior margin near to posterodorsal corner
Mandible
Coxal toothed edge	Several cutting teeth	Several cutting teeth	Smooth
Basal toothed edge	Six triangular cutting teeth	Five triangular cutting teeth	Six triangular cutting teeth
Sixth limb
Basal ventral setae	Three setae	Three setae	Five setae
Basal distodorsal seta (residual exopodite)	Seta barely reaches to the end of this limb	Seta does not reach to the end of this limb	Seta extends beyond the end of this limb
Terminal setae	Dorsal seta is 2.8 times the length of the ventral seta*	Dorsal seta is approximately three times the length of the ventral seta*	Dorsal, central, and ventral setae are subequal in length
Caudal furca	There is an unpaired seta	There is no unpaired seta	Unpaired seta is missing

Bathyconchoecia nanshaensis sp. nov. (Myodocopa, Halocyprididae), a new species of ostracod from the southern South China Sea*

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