Spicomacrurus adelscotti ( Iwamoto & Merrett, 1997 )

Schwarzhans, Werner, 2014, Head and otolith morphology of the genera Hymenocephalus, Hymenogadus and Spicomacrurus (Macrouridae), with the description of three new species, Zootaxa 3888 (1), pp. 1-73 : 20

publication ID

https://doi.org/ 10.11646/zootaxa.3888.1.1

publication LSID

lsid:zoobank.org:pub:1B437AE1-CF28-4C1B-95B6-C31A295905A0

DOI

https://doi.org/10.5281/zenodo.10238805

persistent identifier

https://treatment.plazi.org/id/463A8F36-FFA3-FFEB-1297-9AE8E356F948

treatment provided by

Felipe

scientific name

Spicomacrurus adelscotti ( Iwamoto & Merrett, 1997 )
status

 

Spicomacrurus adelscotti ( Iwamoto & Merrett, 1997) View in CoL

Figs. 3C–D View FIGURE 3 , 4A–B View FIGURE 4 , 5 View FIGURE 5

Hymenocephalus (Spicomacrurus) adelscotti Iwamoto & Merrett, 1997: 514 View in CoL (type locality: 11°54’S, 179°31’W); Iwamoto & Williams, 1999: 176.

Material examined. 1 specimen WAM P.28073-004, 154+ mm TL, 17°45’S, 118°32’E, 600– 690 m GoogleMaps .

Diagnosis. Pelvic fin rays 9; nasal bones closely adjoining along mesial edges, forming three horizontal platelike processes; OL:OH = 1.75.

Comparison. Spicomacrurus adelscotti most closely resembles S. kuronumai , differing in the number of pelvic fin rays (9 vs 8), the more elongate head shape (head length: height = 2.1 vs 1.7) and the more elongate otolith (OL:OH = 1.75 vs 1.45–1.6). The occiput does not show any relict of scales or scale pockets as do the studied specimens of S. kuronumai .

Description. Head morphology ( Figs. 3C–D View FIGURE 3 ): Head length to height about 2.1 with relatively firm head bones and platy spatulate nasal bones closely adjoining along mesial edges. No indication of scales on head. Snout length 26% HL, orbit diameter 29% HL, interorbital width 40% HW. Barbel 18% HL, reaching vertical through center of orbit. Infraorbital, supraorbital and preopercular canal systems narrow with widths <8% HL, covered by rather thick, firm skin. One small pore visible in anterior section of infraorbital skin. Preopercular angle broad, not projecting.

Otolith morphology ( Fig. 4A–B View FIGURE 4 ): Thin, elongate otoliths with slightly convex inner and slightly concave outer face. OL:OH = 1.75; OH:OT = 4. Predorsal lobe moderately developed, narrow; ventral rim shallow; anterior tip blunt, posterior tip moderately pointed. Sulcus slightly supramedian with narrow, ventrally-indented collum. Colliculi large, reaching close to anterior and posterior rims of otolith, caudal colliculum about 1½ times the length of ostial colliculum; pseudocolliculum indistinct, short; TCL:PCL = 9. Dorsal depression large; ventral furrow distinct, turning upwards and away from ventral rim posteriorly.

Distribution. ( Fig. 5 View FIGURE 5 ) Known from only two specimens, the holotype off northern Fiji, and the examined specimen from off Western Australia.

WAM

Western Australian Museum

Kingdom

Animalia

Phylum

Chordata

Class

Actinopterygii

Order

Gadiformes

Family

Macrouridae

Genus

Spicomacrurus

Loc

Spicomacrurus adelscotti ( Iwamoto & Merrett, 1997 )

Schwarzhans, Werner 2014
2014
Loc

Hymenocephalus (Spicomacrurus) adelscotti

Iwamoto, T. & Williams, A. 1999: 176
Iwamoto, T. & Merrett, N. R. 1997: 514
1997
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