Caridina pagei Christodoulou & Grave 2023, n. sp.
Creators: name: Christodoulou, Magdalini
name: Grave, Sammy De
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Atyidae
Caridina
Caridina pagei

description: Caridina pagei n. sp.
(Fig. 5)
Caridina indistincta sp. C1 Page & Hughes, 2007a: 225.
Type material. Female holotype (pocl 3.5 mm), Honeyeater Lake, Moreton Isl., 27.096°S, 153.434°E, leg. T.J. Page & J.H. Fawcett, 15.iv.2003 (AM P107225); 6 ovigerous female paratypes (pocl 2.8–3.5 mm), same data as holotype (AM P107226); 4 ovigerous female paratypes (pocl 2.5–3.4 mm), same data as holotype (AM P107227).
Other material examined. Male (pocl 3.0 mm; illustrated), Brown Lake, Moreton Isl., 27.493°S, 153.430°E, leg. T.J. Page, R.K. Stuart & A. Hinde, 16.iii.2003 (AM P107228).
Diagnosis. As the species is morphologically very similar to C. sobrina, only a diagnosis is provided.
Rostrum long, slightly or more prominent, pointed downwards; failing to reach or overreaching distal margin of scaphocerite (Fig. 5A); upper margin bearing 17–24 sutured, equidistant teeth, with additionally 2–4 placed behind orbit; ventral margin with 4–6 teeth. Lower orbital angle prominent, weakly triangular (Fig. 5A). Stylocerite of antennular peduncle reaching to distomedial margin of basal segment. Preanal carina with well-developed upright tooth (Fig. 5K). Telson bearing 4 pairs of dorsolateral spinules; distal margin with medial tooth and 4 pairs of setulose, spiniform setae (Fig. 5I–H). Flexor margin of P3 dactylus with 9–11 (counting unguis) spiniform setae (Fig 5E). Dactylus of P5 with 29–33 (counting unguis) spinules on flexor margin (Fig. 5F). Male first pleopod (Fig. 5G) with endopod conical in overall shape. Appendix masculina (Fig. 5D) of second pleopod with series of long, spinulose setae; appendix interna shorter, about 0.75 of appendix masculina length, distally furnished with numerous cincinnuli. Uropodal diaeresis with 11–13 regularly spaced, short spiniform setae (Fig. 5L). Females with 9– 16 eggs, size of eggs 0.6–0.7 × 0.9–1.2.
Etymology. Named after Tim Page, prolific collector and sequencer of Australian Caridina, as well as an allround nice guy.
Distribution. Currently only known with certainty from Moreton Island (Blue Lagoon, Cravens Creek, Eagers Creek, Honeyeater Lake, Lake Jabiru, Spitfire Creek) and the western side of North Stradbroke Island (Aranarawai Creek, Brown Lake, Capembah Creek, Little Canalpin Creek) (see Page & Hughes 2007a: fig. 1).
Genbank COI haplotype accession number. AY795014 (AM P107225).
Remarks. The above diagnosis allows for the morphological separation of C. pagei sp. nov. from C. sobrina. Although these differences are slight and partially overlapping, the COI divergence of 9.6% (± 0.1) supports species level status.
description: Published as part of Christodoulou, Magdalini & Grave, Sammy De, 2023, Redescription of Caridina sobrina Riek, 1953 stat. nov. and description of a new species of Caridina from south-eastern Queensland (Decapoda, Atyidae), pp. 582-594 in Zootaxa 5353 (6) on page 590, DOI: 10.11646/zootaxa.5353.6.5, http://zenodo.org/record/10027165