Hemiparacytheridea Herrig 1963
Creators: name: Ayress, M. A.
name: Whatley, R.
name: Downing, S. E.
name: Millson, K. J.
Publisher: name: Zenodo
Year: 1995
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Ostracoda
Podocopida
Cytheruridae
Hemiparacytheridea

description: <i>Hemiparacytheridea</i> Herrig, 1963 Type species. <i>Hemiparacytheridea occulta</i> Herrig, 1963 Diagnosis. A genus of the subfamily Cytherurinae with a small carapace of subrectangular or quadrate lateral outline commonly with long caudal process above midheight. Posteroventral and subcentral tubercle present often forming a bitubercular alar structure. Eye tubercle present or absent. Normal pore canals large and regularly distributed. Muscle scars consist of four subovate adductor scars in a vertical row and a subreniform frontal scar ahead of the row. Hinge, in right valve, consists of a small circular anterior terminal tooth, posterior tooth very much reduced or absent, and a locellate median groove expanded posteriorly. Comparisons. This genus lacks the solum pore clusters and distinct posterior terminal hinge element of <i>Eucytherura.</i> <i>Tuberculocythere</i> Colalongo &amp; Pasini, 1980 also lacks these features and is considered to be a strongly tuberculate form of <i>Hemiparacytheridea.</i> Key to Deep-sea Species of <i>Hemiparacytheridea</i> l. Ventral bitubercular alae with curved ventro-lateral ridge; extensive reticulate to punctate ornament.................................................................leopardina --Ventro-lateral ridge absent; ornament only weakly developed.................................................2 2. Dorsal tubercles weakly developed; lateral outline elongate.................................vanharteni <i>Hemiparacytheridea</i> <i>/eopardina</i> (Ruan &amp; Hao, 1988) Fig. 5 F-L <i>" Eucytherura</i> sp. I" Whatley &amp; Coles, 1987: pI. 3, fig. 17. <i>" Eucytherura</i> sp. 5" Millson, 1987 *: 291; pI. 16, figs 4,5. <i>Bythoceratina leopardina</i> Ruan &amp; Hao, 1988: 257, pI. 41, figs 20 -23. <i>? Typhlocythere tetrandosa. - Ruan,</i> 1989: 123, pI. 22 fig. 24. <i>"</i> <i>Eucytherura variabile"</i> Downing, 1985 *: 444; pI. 29, figs 3- 9.- Smith, 1983 *: 88, pI. 8 fig. 5.- Ayress, 1988 *: 598, pI. 20 figs 22-24. Dimensions. OS 14077, female left valve, length 0.35 mm, height 0.20 mm; OS 14078, female left valve, length 0.33 mm, height 0.20 mm, both from Site 209, core 2, section 6, interval 75-80 cm, Early Pleistocene, Zone NN 19. OS 14079, female right valve, length 0.33 mm, height 0.20 mm, Site 209, core 1, section 1, interval 75 -80 cm, Late Pleistocene, Zone NN 21. Emended diagnosis. <i>Hemiparacytheridea</i> with a moderately large posteroventral alar structure, forward from which extends a laterally directed ridge that turns sharply downward just anterior of a hemispherical subcentral tubercle. Ribbed pyramidal tubercle anterodorsally, irregular subtriangular tubercle posterodorsally. Sinuous ridge extends subvertically anterodorsally. Reticulation fossae circular medially, polygonal elsewhere. Caudal process somewhat downturned. Comparisons. Our material of this species displays considerable variation in the strength of the reticulation muri. The ventral bitubercular alar structure and associated downward curving anteroventral ridge, together with the pyramidal anterodorsal tubercle, seem to be consistent diagnostic features of this species and we have no doubt that our material belongs to <i>H. leopardina.</i> It is clearly closely related to <i>Hemiparacytheridea hemingwayi</i> Neale, 1975 described from the Late Cretaceous Gingin Chalk of Western Australia. The latter species differs only in having a straight dorsal margin. The large anterodorsal tubercle of <i>H. leopardina</i> lacks an ocular sinus internally. Neale describes the same tubercle of <i>H. hemingwayi</i> as an "eye tubercle" but no internal description is given in support of this interpretation. If indeed ocular structures (glassy lens or internal sinus) are present then these features also could serve to distinguish the two species. A similar species, as yet undescribed, has been recorded in the Middle Eocene to Middle Miocene of ODP Site 214, eastern Indian Ocean (Boomer, pers. comm. 1993) which differs in having a more elongate upturned caudal process. Distribution. Ruan &amp; Hao (1988) first described this species from 1405 m and 1540 m in the Okinawa Trough, East China Sea. Ruan (1988) recorded this species in a Quaternary core taken at 2004 m in the South China Sea. In our material the species is recorded at both bathyal and abyssal depths in the south-west Pacific from the Recent (coretop) of OSI cores 1-86/ 19GCll, 12 -87/13GClO, TL 8731, 8771, 8730, 8695, TS 8646, 8636; P1eistocene of DSDP Sites 203, 208, 209, 588, Sonne 36 -61, AGSO 71GC044, OSI 12- 87/ 12GC9, 1-86/6GC3, Z 2108; Pliocene of DSDP Sites 206, 207A, 208 and 289; Late Miocene to Late Pliocene of DSDP Site 592; Middle Miocene of DSDP Sites 62 and 209; Late Oligocene to Early Pliocene of DSDP Site 593; Middle Eocene of DSDP Site 207A; and in the eastern Indian Ocean from the Pleistocene of DSDP Sites 253, 254 and 258. Whatley &amp; Coles (1987) recorded this species in the Late Miocene of DSDP Site 608, Norih Atlantic.
description: Published as part of <i>Ayress, M. A., Whatley, R., Downing, S. E. &amp; Millson, K. J., 1995, Cainozoic and from Recent Deep Sea Cytherurid Ostracoda the South Western Pacific and Eastern Indian Oceans, Part Cytherurinae, pp. 203-223 in Records of the Australian Museum 47 (2)</i> on page 219, DOI: 10.3853/j.0067-1975.47.1995.237, http://zenodo.org/record/4660625
description: {"references": ["Herrig, E., 1963. Neue Ostracoden Arten aus der Welssen Schreibkreide der Insel Rugen (Unter-Maastncht). Wissenschaftliche zeitschrift der Ernst-Moritz-Arndt- Universitaet Greifswald, Mathematisch-Naturwissenschaftliche Reihe 12 (3 / 4): 289 - 325.", "Colalongo, M. L. &amp; G. Pasini, 1980. Plio-Pleistocene Ostracoda of the Vrica Section in Calabria, with remarks on the Neogene / Quaternary Boundary. Bollettino della Societa Paleontologica Italiana 19: 44 - 126.", "Whatley, R. C. &amp; G. Coles, 1987. The Late Miocene to Quarternary Ostracoda of Leg 94, Deep Sea Drilling Project. Revista Espanola de Micropaleontologla 19: 33 - 97.", "Millson, K., 1987. The Palaeobiology of Palaeogene Ostracoda from Deep Sea Drilling Project cores in the South West Pacific. Unpublished Ph. D. thesis, University College of Wales, Aberystwyth, 733 pp.", "Ruan, P. &amp; Y. Hao, 1988. Systematic description of microfossils. 2. Ostracoda. In L. Rong &amp; Z. Shu (eds.). Quaternary microbiotas in the Okinawa Tr. ough and \u747e\u6569\u7220 geological significance. Chinese UniverSIty of Bel] lllg Geosciences Press, Beijing.", "Ruan, P., 1989. Systematic description of genera and specIes. 4. Ostracoda. In P. Wang (ed.). Quaternary mlcroblOtas and their geological significance from Northern Xisha Trench of South China Sea. Chinese University of Wuhan Geosciences Press, Beijing.", "Downing, S., 1985. The Taxonomy, Palaeoecology, Biostratigraphy and Evolution of Pliocene Ostracoda from the W. Pacific. Unpublished Ph. D. thesis, University College of Wales, Aberystwyth, 1073 pp.", "Smith, P., 1983. Quaternary Deep Sea Ostracoda from t. he Southwest Pacific. Unpublished M. Sc. theSIS, Umverslty College of Wales, Aberystwyth, 254 pp.", "Ayress, M., 1988. Late Pliocene to Quaternary deep-sea Ostracoda from the eastern Indian and Southwestern Pacific Oceans. Unpublished Ph. D. thesis, University College of Wales, Aberystwyth, 1203 pp.", "Neale, lW., 1975. The ostracod fauna from the \u5361\u6e74\u6f6e\u697e\u6e20 chalk (Upper Cretaceous) of Gingin, western AustralIa. Special Papers in Palaeontology, 16. 81 pp, 22 pI. The Palaeontological Association, London."]}