Phenganax marumi, Lau, Yee Wah & Reimer, James D., 2019

Lau, Yee Wah & Reimer, James D., 2019, A first phylogenetic study on stoloniferous octocorals off the coast of Kota Kinabalu, Sabah, Malaysia, with the description of two new genera and five new species, ZooKeys 872, pp. 127-158: 127

publication ID

http://dx.doi.org/10.3897/zookeys.872.36288

publication LSID

lsid:zoobank.org:pub:BDF92DBF-34CE-4600-939D-2573C7D4F0B4

persistent identifier

http://treatment.plazi.org/id/29410835-EB6E-4E9D-9361-CF60FE36ECFD

taxon LSID

lsid:zoobank.org:act:29410835-EB6E-4E9D-9361-CF60FE36ECFD

treatment provided by

ZooKeys by Pensoft

scientific name

Phenganax marumi
status

sp. nov.

Phenganax marumi  sp. nov. Figure 3bView Figure 3

Material examined.

All specimens are from Kota Kinabalu, Sabah, Malaysia and collected by YW Lau. Holotype: NSMT-Co 1683, Manukan, Manukan Island, TARP (05°58'46.1"N, 116°00'10.6"E), 13 m depth. Paratypes: IPMB-C 01.00001: Edgell Patches, west of Sapi Island (06°00'38.7"N, 115°59'22.2"E), 16 m depth. IPMB-C 01.00002: Mid Reef Slope, east of Manukan Island, TARP (05°58'38.08"N, 116°00'52.82"E), 13 m depth. IPMB-C 01.00003: Mid Reef Slope, east of Manukan Island, TARP (05°58'38.08"N, 116°00'52.82"E), 11 m depth. IPMB-C 01.00004: Edgell Patches, west of Sapi Island (06°00'38.7"N, 115°59'22.2"E), 19 m depth. IPMB-C 01.00005: Edgell Patches, west of Sapi Island (06°00'38.7"N, 115°59'22.2"E), 16 m depth. IPMB-C 01.00006: Gaya Clement Reef, west of Gaya Island, TARP (06°01'24.26"N, 116°00'13.55"E), 12 m depth. IPMB-C 01.00007: Gaya Clement Reef, west of Gaya Island, TARP (06°01'24.26"N, 116°00'13.55"E), 11 m depth. IPMB-C 01.00008: Manukan, north of Manukan Island, TARP (05°58'46.1"N, 116°00'10.6"E), 12 m depth. IPMB-C 01.00009: Manukan, Manukan Island, TARP (05°58'46.1"N, 116°00'10.6"E), 12 m depth. IPMB-C 01.00010: Manukan, Manukan Island, TARP (05°58'46.1"N, 116°00'10.6"E), 12 m depth.

Description.

Colony is attached to rock and sponge and consists of ~15 polyps. Stolons are consistent in width throughout the colony (~0.35 mm). Polyps are spaced apart irregularly (from 0.5 mm up to 6 mm) and retract fully into calyces; calyces do not retract into stolon and are approximately 1 mm in width and 2 mm in height. Expanded polyps 4.0-5.5 mm in width. The pinnules are arranged on either side of the rachis in pairs of 12-15, sometimes spaced apart irregularly. The pinnules give a swollen appearance and are mostly conical shaped, otherwise diamond-shaped. The colony is sclerite-free. Polyps are brownish yellow in colour, with a bright yellowish white oral disk in life (whitish yellow when preserved in ethanol). Tentacles have a greenish colour interrupted with brown specks. Zooxanthellate.

Morphological variation.

Paratypes IPMB-C 01.00003 and IPMB-C 01.00007 show variation in the colouration of the polyps, having a paler and pinkish appearance. There is also variation in the number of pinnule pairs (~8 pairs) and the space between the pinnules; pinnules are sometimes so densely packed there is no space between them. Like the holotype, all paratype colonies are small colonies consisting of ~20 polyps.

Distribution.

Gaya, Sapi and Manukan Islands, TARP, Kota Kinabalu, Sabah, Malaysia.

Remarks.

Phenganax marumi  sp. nov. resembles Phenganax parrini  Alderslade & McFadden, 2011 in polyp morphology, but differs in colour. The numerous and densely packed polyps described for a P. parrini  colony ( Alderslade and McFadden 2011) have not been observed in any of the 11 collected P. marumi  colonies; instead the maximum number of polyps observed in one colony was approximately 35. However, the density of P. parrini  could be caused by unnatural conditions (aquarium environment) in which it was kept for scientific research purposes ( Alderslade and McFadden 2011). Phenganax marumi  was found on exposed spots on the reef, not sheltered from strong current or light, as opposed to P. parrini  , which was found in dimly lit, sheltered locations.

Etymology.

From the Japanese word marumi  , which means round or rounded; denoting the plump shape of the polyp tentacles, which give the polyp an overall plump appearance.

Kingdom

Animalia

Phylum

Cnidaria

Class

Anthozoa

Order

Alcyonacea

Family

Arulidae

Genus

Phenganax