Cyproidea excavata
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Ordo: Amphipoda
Familia: Cyproideidae
Genus: Cyproidea
Name
Cyproidea excavata Myers, 2012 sp. n. – Wikispecies link – ZooBank link – Pensoft Profile
Type material
Holotype unknown sex, 1.9 mm. OUMNH.ZC.2002–24–0095, Pkuklim Reef; Halimeda clumps on reef rubble, from Halimeda (Chlorophyta) washings, -6 m depth; 07°20.542'N, 134°34.023'E; leg. S. De Grave & C. Burras, 29 May 2002.
Other material
1 specimen (unknown sex), dissected. Outside Risong channel, light trap sample,, 50 feet deep; 07°17.903'N, 134°28.544'E; leg. S. De Grave & C. Burras, night 25th–26th May 2002.
Etymology
Named for the excavated palm of gnathopod 2.
Description
Based on holotype 1.9 mm.
Head. Eye very large, round. Antenna 1 less than one third body length; peduncular articles 1 and 2 subequal in length, article 2 with strong anterodistal spine overreaching half of flagellar article 1; flagellum with 7 articles each bearing a pair of long posterodistal setae. Antenna 2 slender, longer than antenna 1; peduncular articles 4 and 5 subequal; flagellum shorter than peduncular article 5 with three articles. Mandible palp slender, rod-shaped, article 3 shorter than article 2, narrowing distally with one long and one short distal seta.
Pereon. Gnathopod 1 coxa vestigial; basis broad; ischium with posterodistal spine; carpus shorter than propodus with long posterodistal acute spine reaching tip of propodus; propodus subrectangular, palm with shallow excavation; dactylus overlapping palm. Gnathopod 2 basis slender, carpus posterodistal margin with blunt spine extending along one third length of posterior margin of propodus; propodus longer and wider then carpus, subovoid; palm oblique; dactylus elongate, strongly curved, greatly overlapping palm. Pereopod 3 coxa subtriangular. Pereopod 4 coxa subovoid. Pereopods 5–7 subequal in length.
Pleon. Urosomite 3 with dorsodistal hood extending over telson. Uropod 3 rami subequal a little longer than peduncle.
Habitat
In Halimeda
Remarks
Colomastix excavata sp. n. appears to be closest to Colomastix serratipalma Schellenberg (1938)[1] from New Caledonia, but in that species, on gnathopod 2, the spine on the postero-distal margin of the carpus is very slender throughout its length (broad based in Colomastix excavata sp. n.) and the palm is evenly convex. Cyproidea excavata sp. n. differs from both Colomastix liodactyla Hirayama (1978) and Colomastix cobia Azman (2009)[2] in gnathopod 1 which in those species has a serrated palm and spines on the posterior margin of the dactylus. It differs from Colomastix ornata Haswell (1880) in the more slender propodus of gnathopod 1, the excavate palm of gnathopod 2, and the subequal rami of uropod 3.
Distribution
Known only from the type locality.
Original Description
- Myers, A; 2012: Amphipoda (Crustacea) from Palau, Micronesia: Families Ampeliscidae, Ampithoidae, Aoridae, Colomastigidae and Cyproideidae ZooKeys, 193: 1-25. doi
Other References
- ↑ Schellenberg A (1938) Litorale Amphipoden des tropischen Pazifiks nach Sammlungen von Prof. Bock (Stockholm), Prof. Dahl (Berlin) und Prof. Pietschmann (Wein). Kungliga Svenska Vetenskapsakademiens Handlingar Series 3 16(6): 1–105.
- ↑ Azman B (2009) Cyproideidae. In: Lowry J Myers A (Eds). Benthic Amphipoda (Crustacea: Peracarida) of the Great Barrier Reef. Zootaxa 2260: 380–392.
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