Microbrotula Gosline

M. Eric Anderson, 2005, Three new species of Microbrotula (Teleostei: Ophidiiformes: Bythitidae) from the Indo-West Pacific., Zootaxa 1006, pp. 33-42: 34-35

publication ID

z01006p033

publication LSID

lsid:zoobank.org:pub:7D252A45-2315-44C3-9CE9-416A480DF2A9

persistent identifier

http://treatment.plazi.org/id/50FF7E9C-72DE-4852-A9B0-75171AFEB327

taxon LSID

lsid:zoobank.org:act:50FF7E9C-72DE-4852-A9B0-75171AFEB327

treatment provided by

Thomas

scientific name

Microbrotula Gosline
status

sp. n.

Microbrotula Gosline  ZBK  , 1953

Microbrotula Gosline  ZBK  , 1953: 218 (type species: Microbrotula rubra Gosline  ZBK  , 1953, by original designation). Cohen and Wourms, 1976: 81 (new diagnosis). Cohen and Nielsen, 1978: 48 (diagnosis; mention of undescribed species). Nielsen and Cohen, 1999: 106 (diagnosis, key).

Included species. Microbrotula  ZBK  comprises five species, M. bentleyi  ZBK  sp. n., M. polyactis  ZBK  sp. n., M. queenslandica  ZBK  sp. n., M. randalli  ZBK  and M. rubra  ZBK  .

Diagnosis. The genus is distinguished from all other Bythitinae as defined by Cohen and Nielsen (1978) by the following combination of characters: Dwarf species reaching only 45 mm SL ( M. rubra  ZBK  ). Body relatively short, head length 25.7-29.2% SL. Vertebrae 11-13 + 33-44 = 44-56. Dorsal fin retrograde, its origin above vertebrae 7-11, anal-fin origin beneath vertebrae 14-17. Neural spines of vertebrae 4-8 depressed; spine of first vertebra much reduced. Eye small, 6.5-17.5% HL. Anterior nostril with slight tube, located just above upper lip. Rear portion of maxilla ensheathed in M. bentleyi  ZBK  and M. polyactis  ZBK  , free in remaining species, and with small, ventrally-directed projection at lower rear corner. Tongue with short, anterior projection, rounded at tip. Vomerine teeth in two small patches; palatine teeth viliform, in single row. Opercular spine strong, usually imbedded. Developed gill rakers 2-4, with tiny denticles on outer surface. Branchiostegal rays 7. Scales very small, imbricated, present on top of head and cheeks in adults. Lateral line mediolateral, of tiny papillae. Pectoral-fin rays 9-17, set on short peduncle that is higher than long. Pelvic fin of a single ray, its length growth-related but reaching almost to anus in adults. Caudal-fin rays 4-6 except in M. polyactis  ZBK  which has 7-8 rays. Male intromittent organ simple, without ossified or sclerified parts (pseudoclasper).

Key to the species of Microbrotula  ZBK 

1 Pectoral-fin rays 9-11 ................................................................................................... 2

- Pectoral-fin rays 13-17 ................................................................................................. 3

2 Five head pores at interorbital area; predorsal length 40.0-47.6% SL (dorsal-fin origin directly above vertebrae 10-11); prepelvic length 19.9-22.2% SL; distance symphysis of cleithra to pelvic fin insertion 10.7-14.8% HL; lateral scale rows 63-66; anal-fin rays 71-76; total vertebrae 52-56 ................................................................. M. randalli  ZBK 

- No head pores; predorsal length 34.6% SL (dorsal-fin origin above vertebra 7); prepelvic length 23.4-24.6% SL; distance symphysis of cleithra to pelvic fin insertion 26.2- 28.2% HL; lateral scale rows 56-57; anal-fin rays 62-64; total vertebrae 48-49 ......... ............................................................................................................ M. queenslandica  ZBK 

3 Pectoral-fin rays 13-14; caudal-fin rays 4-6; lateral scale rows 54-ca.60; orbit diameter6.5-13.9% HL ......................................................................................................... 4

- Pectoral-fin rays 16-17; caudal-fin rays 7-8; lateral scale rows 47-50; orbit diameter 16.0-18.7% HL ......................................................................................... M. polyactis  ZBK 

4 Vertebrae 11 + 40-41; dorsal-fin rays 81-92; anal-fin rays 72-80; predorsal length 43.5-47.6% SL; orbit diameter 6.5-9.1% HL; fleshy interorbital width 23.8-27.8% HL; lateral scale rows ca. 60 ........................................................................... M. rubra  ZBK 

- Vertebrae 11 + 33-35; dorsal-fin rays 65-71; anal-fin rays 55-59; predorsal length 36.5-41.3% SL; orbit diameter 10.9-13.9% HL; fleshy interorbital width 16.8-19.8% HL; lateral scale rows 54-55 ........................................................................ M. bentleyi  ZBK